5 Changes between 1.0.2 and 1.1.0 [xx XXX xxxx]
7 *) config has been changed so that by default OPENSSL_NO_DEPRECATED is used.
8 Access to deprecated functions can be re-enabled by running config with
9 "enable-deprecated". In addition applications wishing to use deprecated
10 functions must define OPENSSL_USE_DEPRECATED. Note that this new behaviour
11 will, by default, disable some transitive includes that previously existed
12 in the header files (e.g. ec.h will no longer, by default, include bn.h)
15 *) Added support for OCB mode. OpenSSL has been granted a patent license
16 compatible with the OpenSSL license for use of OCB. Details are available
17 at https://www.openssl.org/docs/misc/OCB-patent-grant-OpenSSL.pdf. Support
18 for OCB can be removed by calling config with no-ocb.
21 *) SSLv2 support has been removed. It still supports receiving a SSLv2
22 compatible client hello.
25 *) Increased the minimal RSA keysize from 256 to 512 bits [Rich Salz],
26 done while fixing the error code for the key-too-small case.
27 [Annie Yousar <a.yousar@informatik.hu-berlin.de>]
29 *) Remove various unsupported platforms:
35 Sinix/ReliantUNIX RM400
39 *) Experimental support for a new, fast, unbiased prime candidate generator,
40 bn_probable_prime_dh_coprime(). Not currently used by any prime generator.
41 [Felix Laurie von Massenbach <felix@erbridge.co.uk>]
43 *) New output format NSS in the sess_id command line tool. This allows
44 exporting the session id and the master key in NSS keylog format.
45 [Martin Kaiser <martin@kaiser.cx>]
47 *) Harmonize version and its documentation. -f flag is used to display
49 [mancha <mancha1@zoho.com>]
51 *) Fix eckey_priv_encode so it immediately returns an error upon a failure
53 [mancha <mancha1@zoho.com>]
55 *) Fix some double frees. These are not thought to be exploitable.
56 [mancha <mancha1@zoho.com>]
58 *) A missing bounds check in the handling of the TLS heartbeat extension
59 can be used to reveal up to 64k of memory to a connected client or
62 Thanks for Neel Mehta of Google Security for discovering this bug and to
63 Adam Langley <agl@chromium.org> and Bodo Moeller <bmoeller@acm.org> for
64 preparing the fix (CVE-2014-0160)
65 [Adam Langley, Bodo Moeller]
67 *) Fix for the attack described in the paper "Recovering OpenSSL
68 ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack"
69 by Yuval Yarom and Naomi Benger. Details can be obtained from:
70 http://eprint.iacr.org/2014/140
72 Thanks to Yuval Yarom and Naomi Benger for discovering this
73 flaw and to Yuval Yarom for supplying a fix (CVE-2014-0076)
74 [Yuval Yarom and Naomi Benger]
76 *) Use algorithm specific chains in SSL_CTX_use_certificate_chain_file():
77 this fixes a limitation in previous versions of OpenSSL.
80 *) Experimental encrypt-then-mac support.
82 Experimental support for encrypt then mac from
83 draft-gutmann-tls-encrypt-then-mac-02.txt
85 To enable it set the appropriate extension number (0x42 for the test
86 server) using e.g. -DTLSEXT_TYPE_encrypt_then_mac=0x42
88 For non-compliant peers (i.e. just about everything) this should have no
91 WARNING: EXPERIMENTAL, SUBJECT TO CHANGE.
95 *) Add EVP support for key wrapping algorithms, to avoid problems with
96 existing code the flag EVP_CIPHER_CTX_WRAP_ALLOW has to be set in
97 the EVP_CIPHER_CTX or an error is returned. Add AES and DES3 wrap
98 algorithms and include tests cases.
101 *) Extend CMS code to support RSA-PSS signatures and RSA-OAEP for
105 *) Extended RSA OAEP support via EVP_PKEY API. Options to specify digest,
106 MGF1 digest and OAEP label.
109 *) Make openssl verify return errors.
110 [Chris Palmer <palmer@google.com> and Ben Laurie]
112 *) New function ASN1_TIME_diff to calculate the difference between two
113 ASN1_TIME structures or one structure and the current time.
116 *) Update fips_test_suite to support multiple command line options. New
117 test to induce all self test errors in sequence and check expected
121 *) Add FIPS_{rsa,dsa,ecdsa}_{sign,verify} functions which digest and
122 sign or verify all in one operation.
125 *) Add fips_algvs: a multicall fips utility incorporating all the algorithm
126 test programs and fips_test_suite. Includes functionality to parse
127 the minimal script output of fipsalgest.pl directly.
130 *) Add authorisation parameter to FIPS_module_mode_set().
133 *) Add FIPS selftest for ECDH algorithm using P-224 and B-233 curves.
136 *) Use separate DRBG fields for internal and external flags. New function
137 FIPS_drbg_health_check() to perform on demand health checking. Add
138 generation tests to fips_test_suite with reduced health check interval to
139 demonstrate periodic health checking. Add "nodh" option to
140 fips_test_suite to skip very slow DH test.
143 *) New function FIPS_get_cipherbynid() to lookup FIPS supported ciphers
147 *) More extensive health check for DRBG checking many more failure modes.
148 New function FIPS_selftest_drbg_all() to handle every possible DRBG
149 combination: call this in fips_test_suite.
152 *) Add support for Dual EC DRBG from SP800-90. Update DRBG algorithm test
153 and POST to handle Dual EC cases.
156 *) Add support for canonical generation of DSA parameter 'g'. See
159 *) Add support for HMAC DRBG from SP800-90. Update DRBG algorithm test and
160 POST to handle HMAC cases.
163 *) Add functions FIPS_module_version() and FIPS_module_version_text()
164 to return numerical and string versions of the FIPS module number.
167 *) Rename FIPS_mode_set and FIPS_mode to FIPS_module_mode_set and
168 FIPS_module_mode. FIPS_mode and FIPS_mode_set will be implemented
169 outside the validated module in the FIPS capable OpenSSL.
172 *) Minor change to DRBG entropy callback semantics. In some cases
173 there is no multiple of the block length between min_len and
174 max_len. Allow the callback to return more than max_len bytes
175 of entropy but discard any extra: it is the callback's responsibility
176 to ensure that the extra data discarded does not impact the
177 requested amount of entropy.
180 *) Add PRNG security strength checks to RSA, DSA and ECDSA using
181 information in FIPS186-3, SP800-57 and SP800-131A.
184 *) CCM support via EVP. Interface is very similar to GCM case except we
185 must supply all data in one chunk (i.e. no update, final) and the
186 message length must be supplied if AAD is used. Add algorithm test
190 *) Initial version of POST overhaul. Add POST callback to allow the status
191 of POST to be monitored and/or failures induced. Modify fips_test_suite
192 to use callback. Always run all selftests even if one fails.
195 *) XTS support including algorithm test driver in the fips_gcmtest program.
196 Note: this does increase the maximum key length from 32 to 64 bytes but
197 there should be no binary compatibility issues as existing applications
198 will never use XTS mode.
201 *) Extensive reorganisation of FIPS PRNG behaviour. Remove all dependencies
202 to OpenSSL RAND code and replace with a tiny FIPS RAND API which also
203 performs algorithm blocking for unapproved PRNG types. Also do not
204 set PRNG type in FIPS_mode_set(): leave this to the application.
205 Add default OpenSSL DRBG handling: sets up FIPS PRNG and seeds with
206 the standard OpenSSL PRNG: set additional data to a date time vector.
209 *) Rename old X9.31 PRNG functions of the form FIPS_rand* to FIPS_x931*.
210 This shouldn't present any incompatibility problems because applications
211 shouldn't be using these directly and any that are will need to rethink
212 anyway as the X9.31 PRNG is now deprecated by FIPS 140-2
215 *) Extensive self tests and health checking required by SP800-90 DRBG.
216 Remove strength parameter from FIPS_drbg_instantiate and always
217 instantiate at maximum supported strength.
220 *) Add ECDH code to fips module and fips_ecdhvs for primitives only testing.
223 *) New algorithm test program fips_dhvs to handle DH primitives only testing.
226 *) New function DH_compute_key_padded() to compute a DH key and pad with
227 leading zeroes if needed: this complies with SP800-56A et al.
230 *) Initial implementation of SP800-90 DRBGs for Hash and CTR. Not used by
231 anything, incomplete, subject to change and largely untested at present.
234 *) Modify fipscanisteronly build option to only build the necessary object
235 files by filtering FIPS_EX_OBJ through a perl script in crypto/Makefile.
238 *) Add experimental option FIPSSYMS to give all symbols in
239 fipscanister.o and FIPS or fips prefix. This will avoid
240 conflicts with future versions of OpenSSL. Add perl script
241 util/fipsas.pl to preprocess assembly language source files
242 and rename any affected symbols.
245 *) Add selftest checks and algorithm block of non-fips algorithms in
246 FIPS mode. Remove DES2 from selftests.
249 *) Add ECDSA code to fips module. Add tiny fips_ecdsa_check to just
250 return internal method without any ENGINE dependencies. Add new
251 tiny fips sign and verify functions.
254 *) New build option no-ec2m to disable characteristic 2 code.
257 *) New build option "fipscanisteronly". This only builds fipscanister.o
258 and (currently) associated fips utilities. Uses the file Makefile.fips
259 instead of Makefile.org as the prototype.
262 *) Add some FIPS mode restrictions to GCM. Add internal IV generator.
263 Update fips_gcmtest to use IV generator.
266 *) Initial, experimental EVP support for AES-GCM. AAD can be input by
267 setting output buffer to NULL. The *Final function must be
268 called although it will not retrieve any additional data. The tag
269 can be set or retrieved with a ctrl. The IV length is by default 12
270 bytes (96 bits) but can be set to an alternative value. If the IV
271 length exceeds the maximum IV length (currently 16 bytes) it cannot be
275 *) New flag in ciphers: EVP_CIPH_FLAG_CUSTOM_CIPHER. This means the
276 underlying do_cipher function handles all cipher semantics itself
277 including padding and finalisation. This is useful if (for example)
278 an ENGINE cipher handles block padding itself. The behaviour of
279 do_cipher is subtly changed if this flag is set: the return value
280 is the number of characters written to the output buffer (zero is
281 no longer an error code) or a negative error code. Also if the
282 input buffer is NULL and length 0 finalisation should be performed.
285 *) If a candidate issuer certificate is already part of the constructed
286 path ignore it: new debug notification X509_V_ERR_PATH_LOOP for this case.
289 *) Improve forward-security support: add functions
291 void SSL_CTX_set_not_resumable_session_callback(SSL_CTX *ctx, int (*cb)(SSL *ssl, int is_forward_secure))
292 void SSL_set_not_resumable_session_callback(SSL *ssl, int (*cb)(SSL *ssl, int is_forward_secure))
294 for use by SSL/TLS servers; the callback function will be called whenever a
295 new session is created, and gets to decide whether the session may be
296 cached to make it resumable (return 0) or not (return 1). (As by the
297 SSL/TLS protocol specifications, the session_id sent by the server will be
298 empty to indicate that the session is not resumable; also, the server will
299 not generate RFC 4507 (RFC 5077) session tickets.)
301 A simple reasonable callback implementation is to return is_forward_secure.
302 This parameter will be set to 1 or 0 depending on the ciphersuite selected
303 by the SSL/TLS server library, indicating whether it can provide forward
305 [Emilia Käsper <emilia.kasper@esat.kuleuven.be> (Google)]
307 *) New -verify_name option in command line utilities to set verification
311 *) Initial CMAC implementation. WARNING: EXPERIMENTAL, API MAY CHANGE.
312 Add CMAC pkey methods.
315 *) Experimental renegotiation in s_server -www mode. If the client
316 browses /reneg connection is renegotiated. If /renegcert it is
317 renegotiated requesting a certificate.
320 *) Add an "external" session cache for debugging purposes to s_server. This
321 should help trace issues which normally are only apparent in deployed
322 multi-process servers.
325 *) Extensive audit of libcrypto with DEBUG_UNUSED. Fix many cases where
326 return value is ignored. NB. The functions RAND_add(), RAND_seed(),
327 BIO_set_cipher() and some obscure PEM functions were changed so they
328 can now return an error. The RAND changes required a change to the
329 RAND_METHOD structure.
332 *) New macro __owur for "OpenSSL Warn Unused Result". This makes use of
333 a gcc attribute to warn if the result of a function is ignored. This
334 is enable if DEBUG_UNUSED is set. Add to several functions in evp.h
335 whose return value is often ignored.
338 Changes between 1.0.1k and 1.0.2 [xx XXX xxxx]
340 *) Facilitate "universal" ARM builds targeting range of ARM ISAs, e.g.
341 ARMv5 through ARMv8, as opposite to "locking" it to single one.
342 So far those who have to target multiple plaforms would compromise
343 and argue that binary targeting say ARMv5 would still execute on
344 ARMv8. "Universal" build resolves this compromise by providing
345 near-optimal performance even on newer platforms.
348 *) Accelerated NIST P-256 elliptic curve implementation for x86_64
349 (other platforms pending).
350 [Shay Gueron & Vlad Krasnov (Intel Corp), Andy Polyakov]
352 *) Add support for the SignedCertificateTimestampList certificate and
353 OCSP response extensions from RFC6962.
356 *) Fix ec_GFp_simple_points_make_affine (thus, EC_POINTs_mul etc.)
357 for corner cases. (Certain input points at infinity could lead to
358 bogus results, with non-infinity inputs mapped to infinity too.)
361 *) Initial support for PowerISA 2.0.7, first implemented in POWER8.
362 This covers AES, SHA256/512 and GHASH. "Initial" means that most
363 common cases are optimized and there still is room for further
364 improvements. Vector Permutation AES for Altivec is also added.
367 *) Add support for little-endian ppc64 Linux target.
368 [Marcelo Cerri (IBM)]
370 *) Initial support for AMRv8 ISA crypto extensions. This covers AES,
371 SHA1, SHA256 and GHASH. "Initial" means that most common cases
372 are optimized and there still is room for further improvements.
373 Both 32- and 64-bit modes are supported.
374 [Andy Polyakov, Ard Biesheuvel (Linaro)]
376 *) Improved ARMv7 NEON support.
379 *) Support for SPARC Architecture 2011 crypto extensions, first
380 implemented in SPARC T4. This covers AES, DES, Camellia, SHA1,
381 SHA256/512, MD5, GHASH and modular exponentiation.
382 [Andy Polyakov, David Miller]
384 *) Accelerated modular exponentiation for Intel processors, a.k.a.
386 [Shay Gueron & Vlad Krasnov (Intel Corp)]
388 *) Support for new and upcoming Intel processors, including AVX2,
389 BMI and SHA ISA extensions. This includes additional "stitched"
390 implementations, AESNI-SHA256 and GCM, and multi-buffer support
393 This work was sponsored by Intel Corp.
396 *) Support for DTLS 1.2. This adds two sets of DTLS methods: DTLS_*_method()
397 supports both DTLS 1.2 and 1.0 and should use whatever version the peer
398 supports and DTLSv1_2_*_method() which supports DTLS 1.2 only.
401 *) Use algorithm specific chains in SSL_CTX_use_certificate_chain_file():
402 this fixes a limiation in previous versions of OpenSSL.
405 *) Extended RSA OAEP support via EVP_PKEY API. Options to specify digest,
406 MGF1 digest and OAEP label.
409 *) Add EVP support for key wrapping algorithms, to avoid problems with
410 existing code the flag EVP_CIPHER_CTX_WRAP_ALLOW has to be set in
411 the EVP_CIPHER_CTX or an error is returned. Add AES and DES3 wrap
412 algorithms and include tests cases.
415 *) Add functions to allocate and set the fields of an ECDSA_METHOD
417 [Douglas E. Engert, Steve Henson]
419 *) New functions OPENSSL_gmtime_diff and ASN1_TIME_diff to find the
420 difference in days and seconds between two tm or ASN1_TIME structures.
423 *) Add -rev test option to s_server to just reverse order of characters
424 received by client and send back to server. Also prints an abbreviated
425 summary of the connection parameters.
428 *) New option -brief for s_client and s_server to print out a brief summary
429 of connection parameters.
432 *) Add callbacks for arbitrary TLS extensions.
433 [Trevor Perrin <trevp@trevp.net> and Ben Laurie]
435 *) New option -crl_download in several openssl utilities to download CRLs
436 from CRLDP extension in certificates.
439 *) New options -CRL and -CRLform for s_client and s_server for CRLs.
442 *) New function X509_CRL_diff to generate a delta CRL from the difference
443 of two full CRLs. Add support to "crl" utility.
446 *) New functions to set lookup_crls function and to retrieve
447 X509_STORE from X509_STORE_CTX.
450 *) Print out deprecated issuer and subject unique ID fields in
454 *) Extend OCSP I/O functions so they can be used for simple general purpose
455 HTTP as well as OCSP. New wrapper function which can be used to download
456 CRLs using the OCSP API.
459 *) Delegate command line handling in s_client/s_server to SSL_CONF APIs.
462 *) SSL_CONF* functions. These provide a common framework for application
463 configuration using configuration files or command lines.
466 *) SSL/TLS tracing code. This parses out SSL/TLS records using the
467 message callback and prints the results. Needs compile time option
468 "enable-ssl-trace". New options to s_client and s_server to enable
472 *) New ctrl and macro to retrieve supported points extensions.
473 Print out extension in s_server and s_client.
476 *) New functions to retrieve certificate signature and signature
480 *) Add functions to retrieve and manipulate the raw cipherlist sent by a
484 *) New Suite B modes for TLS code. These use and enforce the requirements
485 of RFC6460: restrict ciphersuites, only permit Suite B algorithms and
486 only use Suite B curves. The Suite B modes can be set by using the
487 strings "SUITEB128", "SUITEB192" or "SUITEB128ONLY" for the cipherstring.
490 *) New chain verification flags for Suite B levels of security. Check
491 algorithms are acceptable when flags are set in X509_verify_cert.
494 *) Make tls1_check_chain return a set of flags indicating checks passed
495 by a certificate chain. Add additional tests to handle client
496 certificates: checks for matching certificate type and issuer name
500 *) If an attempt is made to use a signature algorithm not in the peer
501 preference list abort the handshake. If client has no suitable
502 signature algorithms in response to a certificate request do not
506 *) If server EC tmp key is not in client preference list abort handshake.
509 *) Add support for certificate stores in CERT structure. This makes it
510 possible to have different stores per SSL structure or one store in
511 the parent SSL_CTX. Include distint stores for certificate chain
512 verification and chain building. New ctrl SSL_CTRL_BUILD_CERT_CHAIN
513 to build and store a certificate chain in CERT structure: returing
514 an error if the chain cannot be built: this will allow applications
515 to test if a chain is correctly configured.
517 Note: if the CERT based stores are not set then the parent SSL_CTX
518 store is used to retain compatibility with existing behaviour.
522 *) New function ssl_set_client_disabled to set a ciphersuite disabled
523 mask based on the current session, check mask when sending client
524 hello and checking the requested ciphersuite.
527 *) New ctrls to retrieve and set certificate types in a certificate
528 request message. Print out received values in s_client. If certificate
529 types is not set with custom values set sensible values based on
530 supported signature algorithms.
533 *) Support for distinct client and server supported signature algorithms.
536 *) Add certificate callback. If set this is called whenever a certificate
537 is required by client or server. An application can decide which
538 certificate chain to present based on arbitrary criteria: for example
539 supported signature algorithms. Add very simple example to s_server.
540 This fixes many of the problems and restrictions of the existing client
541 certificate callback: for example you can now clear an existing
542 certificate and specify the whole chain.
545 *) Add new "valid_flags" field to CERT_PKEY structure which determines what
546 the certificate can be used for (if anything). Set valid_flags field
547 in new tls1_check_chain function. Simplify ssl_set_cert_masks which used
548 to have similar checks in it.
550 Add new "cert_flags" field to CERT structure and include a "strict mode".
551 This enforces some TLS certificate requirements (such as only permitting
552 certificate signature algorithms contained in the supported algorithms
553 extension) which some implementations ignore: this option should be used
554 with caution as it could cause interoperability issues.
557 *) Update and tidy signature algorithm extension processing. Work out
558 shared signature algorithms based on preferences and peer algorithms
559 and print them out in s_client and s_server. Abort handshake if no
560 shared signature algorithms.
563 *) Add new functions to allow customised supported signature algorithms
564 for SSL and SSL_CTX structures. Add options to s_client and s_server
568 *) New function SSL_certs_clear() to delete all references to certificates
569 from an SSL structure. Before this once a certificate had been added
570 it couldn't be removed.
573 *) Integrate hostname, email address and IP address checking with certificate
574 verification. New verify options supporting checking in opensl utility.
577 *) Fixes and wildcard matching support to hostname and email checking
578 functions. Add manual page.
579 [Florian Weimer (Red Hat Product Security Team)]
581 *) New functions to check a hostname email or IP address against a
582 certificate. Add options x509 utility to print results of checks against
586 *) Fix OCSP checking.
587 [Rob Stradling <rob.stradling@comodo.com> and Ben Laurie]
589 *) Initial experimental support for explicitly trusted non-root CAs.
590 OpenSSL still tries to build a complete chain to a root but if an
591 intermediate CA has a trust setting included that is used. The first
592 setting is used: whether to trust (e.g., -addtrust option to the x509
596 *) Add -trusted_first option which attempts to find certificates in the
597 trusted store even if an untrusted chain is also supplied.
600 *) MIPS assembly pack updates: support for MIPS32r2 and SmartMIPS ASE,
601 platform support for Linux and Android.
604 *) Support for linux-x32, ILP32 environment in x86_64 framework.
607 *) Experimental multi-implementation support for FIPS capable OpenSSL.
608 When in FIPS mode the approved implementations are used as normal,
609 when not in FIPS mode the internal unapproved versions are used instead.
610 This means that the FIPS capable OpenSSL isn't forced to use the
611 (often lower performance) FIPS implementations outside FIPS mode.
614 *) Transparently support X9.42 DH parameters when calling
615 PEM_read_bio_DHparameters. This means existing applications can handle
616 the new parameter format automatically.
619 *) Initial experimental support for X9.42 DH parameter format: mainly
620 to support use of 'q' parameter for RFC5114 parameters.
623 *) Add DH parameters from RFC5114 including test data to dhtest.
626 *) Support for automatic EC temporary key parameter selection. If enabled
627 the most preferred EC parameters are automatically used instead of
628 hardcoded fixed parameters. Now a server just has to call:
629 SSL_CTX_set_ecdh_auto(ctx, 1) and the server will automatically
630 support ECDH and use the most appropriate parameters.
633 *) Enhance and tidy EC curve and point format TLS extension code. Use
634 static structures instead of allocation if default values are used.
635 New ctrls to set curves we wish to support and to retrieve shared curves.
636 Print out shared curves in s_server. New options to s_server and s_client
637 to set list of supported curves.
640 *) New ctrls to retrieve supported signature algorithms and
641 supported curve values as an array of NIDs. Extend openssl utility
642 to print out received values.
645 *) Add new APIs EC_curve_nist2nid and EC_curve_nid2nist which convert
646 between NIDs and the more common NIST names such as "P-256". Enhance
647 ecparam utility and ECC method to recognise the NIST names for curves.
650 *) Enhance SSL/TLS certificate chain handling to support different
651 chains for each certificate instead of one chain in the parent SSL_CTX.
654 *) Support for fixed DH ciphersuite client authentication: where both
655 server and client use DH certificates with common parameters.
658 *) Support for fixed DH ciphersuites: those requiring DH server
662 *) New function i2d_re_X509_tbs for re-encoding the TBS portion of
664 Note: Related 1.0.2-beta specific macros X509_get_cert_info,
665 X509_CINF_set_modified, X509_CINF_get_issuer, X509_CINF_get_extensions and
666 X509_CINF_get_signature were reverted post internal team review.
668 Changes between 1.0.1j and 1.0.1k [xx XXX xxxx]
670 *) Abort handshake if server key exchange message is omitted for ephemeral
673 Thanks to Karthikeyan Bhargavan of the PROSECCO team at INRIA for
674 reporting this issue.
678 *) Remove non-export ephemeral RSA code on client and server. This code
679 violated the TLS standard by allowing the use of temporary RSA keys in
680 non-export ciphersuites and could be used by a server to effectively
681 downgrade the RSA key length used to a value smaller than the server
682 certificate. Thanks for Karthikeyan Bhargavan of the PROSECCO team at
683 INRIA or reporting this issue.
687 *) Ensure that the session ID context of an SSL is updated when its
688 SSL_CTX is updated via SSL_set_SSL_CTX.
690 The session ID context is typically set from the parent SSL_CTX,
691 and can vary with the CTX.
694 *) Fix various certificate fingerprint issues.
696 By using non-DER or invalid encodings outside the signed portion of a
697 certificate the fingerprint can be changed without breaking the signature.
698 Although no details of the signed portion of the certificate can be changed
699 this can cause problems with some applications: e.g. those using the
700 certificate fingerprint for blacklists.
702 1. Reject signatures with non zero unused bits.
704 If the BIT STRING containing the signature has non zero unused bits reject
705 the signature. All current signature algorithms require zero unused bits.
707 2. Check certificate algorithm consistency.
709 Check the AlgorithmIdentifier inside TBS matches the one in the
710 certificate signature. NB: this will result in signature failure
711 errors for some broken certificates.
713 Thanks to Konrad Kraszewski from Google for reporting this issue.
715 3. Check DSA/ECDSA signatures use DER.
717 Reencode DSA/ECDSA signatures and compare with the original received
718 signature. Return an error if there is a mismatch.
720 This will reject various cases including garbage after signature
721 (thanks to Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS
722 program for discovering this case) and use of BER or invalid ASN.1 INTEGERs
723 (negative or with leading zeroes).
725 Further analysis was conducted and fixes were developed by Stephen Henson
726 of the OpenSSL core team.
731 *) Do not resume sessions on the server if the negotiated protocol
732 version does not match the session's version. Resuming with a different
733 version, while not strictly forbidden by the RFC, is of questionable
734 sanity and breaks all known clients.
735 [David Benjamin, Emilia Käsper]
737 *) Tighten handling of the ChangeCipherSpec (CCS) message: reject
738 early CCS messages during renegotiation. (Note that because
739 renegotiation is encrypted, this early CCS was not exploitable.)
742 *) Tighten client-side session ticket handling during renegotiation:
743 ensure that the client only accepts a session ticket if the server sends
744 the extension anew in the ServerHello. Previously, a TLS client would
745 reuse the old extension state and thus accept a session ticket if one was
746 announced in the initial ServerHello.
748 Similarly, ensure that the client requires a session ticket if one
749 was advertised in the ServerHello. Previously, a TLS client would
750 ignore a missing NewSessionTicket message.
753 Changes between 1.0.1i and 1.0.1j [15 Oct 2014]
757 A flaw in the DTLS SRTP extension parsing code allows an attacker, who
758 sends a carefully crafted handshake message, to cause OpenSSL to fail
759 to free up to 64k of memory causing a memory leak. This could be
760 exploited in a Denial Of Service attack. This issue affects OpenSSL
761 1.0.1 server implementations for both SSL/TLS and DTLS regardless of
762 whether SRTP is used or configured. Implementations of OpenSSL that
763 have been compiled with OPENSSL_NO_SRTP defined are not affected.
765 The fix was developed by the OpenSSL team.
769 *) Session Ticket Memory Leak.
771 When an OpenSSL SSL/TLS/DTLS server receives a session ticket the
772 integrity of that ticket is first verified. In the event of a session
773 ticket integrity check failing, OpenSSL will fail to free memory
774 causing a memory leak. By sending a large number of invalid session
775 tickets an attacker could exploit this issue in a Denial Of Service
780 *) Build option no-ssl3 is incomplete.
782 When OpenSSL is configured with "no-ssl3" as a build option, servers
783 could accept and complete a SSL 3.0 handshake, and clients could be
784 configured to send them.
786 [Akamai and the OpenSSL team]
788 *) Add support for TLS_FALLBACK_SCSV.
789 Client applications doing fallback retries should call
790 SSL_set_mode(s, SSL_MODE_SEND_FALLBACK_SCSV).
792 [Adam Langley, Bodo Moeller]
794 *) Add additional DigestInfo checks.
796 Reencode DigestInto in DER and check against the original when
797 verifying RSA signature: this will reject any improperly encoded
798 DigestInfo structures.
800 Note: this is a precautionary measure and no attacks are currently known.
804 Changes between 1.0.1h and 1.0.1i [6 Aug 2014]
806 *) Fix SRP buffer overrun vulnerability. Invalid parameters passed to the
807 SRP code can be overrun an internal buffer. Add sanity check that
808 g, A, B < N to SRP code.
810 Thanks to Sean Devlin and Watson Ladd of Cryptography Services, NCC
811 Group for discovering this issue.
815 *) A flaw in the OpenSSL SSL/TLS server code causes the server to negotiate
816 TLS 1.0 instead of higher protocol versions when the ClientHello message
817 is badly fragmented. This allows a man-in-the-middle attacker to force a
818 downgrade to TLS 1.0 even if both the server and the client support a
819 higher protocol version, by modifying the client's TLS records.
821 Thanks to David Benjamin and Adam Langley (Google) for discovering and
822 researching this issue.
826 *) OpenSSL DTLS clients enabling anonymous (EC)DH ciphersuites are subject
827 to a denial of service attack. A malicious server can crash the client
828 with a null pointer dereference (read) by specifying an anonymous (EC)DH
829 ciphersuite and sending carefully crafted handshake messages.
831 Thanks to Felix Gröbert (Google) for discovering and researching this
836 *) By sending carefully crafted DTLS packets an attacker could cause openssl
837 to leak memory. This can be exploited through a Denial of Service attack.
838 Thanks to Adam Langley for discovering and researching this issue.
842 *) An attacker can force openssl to consume large amounts of memory whilst
843 processing DTLS handshake messages. This can be exploited through a
844 Denial of Service attack.
845 Thanks to Adam Langley for discovering and researching this issue.
849 *) An attacker can force an error condition which causes openssl to crash
850 whilst processing DTLS packets due to memory being freed twice. This
851 can be exploited through a Denial of Service attack.
852 Thanks to Adam Langley and Wan-Teh Chang for discovering and researching
857 *) If a multithreaded client connects to a malicious server using a resumed
858 session and the server sends an ec point format extension it could write
859 up to 255 bytes to freed memory.
861 Thanks to Gabor Tyukasz (LogMeIn Inc) for discovering and researching this
866 *) A malicious server can crash an OpenSSL client with a null pointer
867 dereference (read) by specifying an SRP ciphersuite even though it was not
868 properly negotiated with the client. This can be exploited through a
869 Denial of Service attack.
871 Thanks to Joonas Kuorilehto and Riku Hietamäki (Codenomicon) for
872 discovering and researching this issue.
876 *) A flaw in OBJ_obj2txt may cause pretty printing functions such as
877 X509_name_oneline, X509_name_print_ex et al. to leak some information
878 from the stack. Applications may be affected if they echo pretty printing
879 output to the attacker.
881 Thanks to Ivan Fratric (Google) for discovering this issue.
883 [Emilia Käsper, and Steve Henson]
885 *) Fix ec_GFp_simple_points_make_affine (thus, EC_POINTs_mul etc.)
886 for corner cases. (Certain input points at infinity could lead to
887 bogus results, with non-infinity inputs mapped to infinity too.)
890 Changes between 1.0.1g and 1.0.1h [5 Jun 2014]
892 *) Fix for SSL/TLS MITM flaw. An attacker using a carefully crafted
893 handshake can force the use of weak keying material in OpenSSL
894 SSL/TLS clients and servers.
896 Thanks to KIKUCHI Masashi (Lepidum Co. Ltd.) for discovering and
897 researching this issue. (CVE-2014-0224)
898 [KIKUCHI Masashi, Steve Henson]
900 *) Fix DTLS recursion flaw. By sending an invalid DTLS handshake to an
901 OpenSSL DTLS client the code can be made to recurse eventually crashing
904 Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
906 [Imre Rad, Steve Henson]
908 *) Fix DTLS invalid fragment vulnerability. A buffer overrun attack can
909 be triggered by sending invalid DTLS fragments to an OpenSSL DTLS
910 client or server. This is potentially exploitable to run arbitrary
911 code on a vulnerable client or server.
913 Thanks to Jüri Aedla for reporting this issue. (CVE-2014-0195)
914 [Jüri Aedla, Steve Henson]
916 *) Fix bug in TLS code where clients enable anonymous ECDH ciphersuites
917 are subject to a denial of service attack.
919 Thanks to Felix Gröbert and Ivan Fratric at Google for discovering
920 this issue. (CVE-2014-3470)
921 [Felix Gröbert, Ivan Fratric, Steve Henson]
923 *) Harmonize version and its documentation. -f flag is used to display
925 [mancha <mancha1@zoho.com>]
927 *) Fix eckey_priv_encode so it immediately returns an error upon a failure
929 [mancha <mancha1@zoho.com>]
931 *) Fix some double frees. These are not thought to be exploitable.
932 [mancha <mancha1@zoho.com>]
934 Changes between 1.0.1f and 1.0.1g [7 Apr 2014]
936 *) A missing bounds check in the handling of the TLS heartbeat extension
937 can be used to reveal up to 64k of memory to a connected client or
940 Thanks for Neel Mehta of Google Security for discovering this bug and to
941 Adam Langley <agl@chromium.org> and Bodo Moeller <bmoeller@acm.org> for
942 preparing the fix (CVE-2014-0160)
943 [Adam Langley, Bodo Moeller]
945 *) Fix for the attack described in the paper "Recovering OpenSSL
946 ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack"
947 by Yuval Yarom and Naomi Benger. Details can be obtained from:
948 http://eprint.iacr.org/2014/140
950 Thanks to Yuval Yarom and Naomi Benger for discovering this
951 flaw and to Yuval Yarom for supplying a fix (CVE-2014-0076)
952 [Yuval Yarom and Naomi Benger]
954 *) TLS pad extension: draft-agl-tls-padding-03
956 Workaround for the "TLS hang bug" (see FAQ and PR#2771): if the
957 TLS client Hello record length value would otherwise be > 255 and
958 less that 512 pad with a dummy extension containing zeroes so it
959 is at least 512 bytes long.
961 [Adam Langley, Steve Henson]
963 Changes between 1.0.1e and 1.0.1f [6 Jan 2014]
965 *) Fix for TLS record tampering bug. A carefully crafted invalid
966 handshake could crash OpenSSL with a NULL pointer exception.
967 Thanks to Anton Johansson for reporting this issues.
970 *) Keep original DTLS digest and encryption contexts in retransmission
971 structures so we can use the previous session parameters if they need
972 to be resent. (CVE-2013-6450)
975 *) Add option SSL_OP_SAFARI_ECDHE_ECDSA_BUG (part of SSL_OP_ALL) which
976 avoids preferring ECDHE-ECDSA ciphers when the client appears to be
977 Safari on OS X. Safari on OS X 10.8..10.8.3 advertises support for
978 several ECDHE-ECDSA ciphers, but fails to negotiate them. The bug
979 is fixed in OS X 10.8.4, but Apple have ruled out both hot fixing
980 10.8..10.8.3 and forcing users to upgrade to 10.8.4 or newer.
981 [Rob Stradling, Adam Langley]
983 Changes between 1.0.1d and 1.0.1e [11 Feb 2013]
985 *) Correct fix for CVE-2013-0169. The original didn't work on AES-NI
986 supporting platforms or when small records were transferred.
987 [Andy Polyakov, Steve Henson]
989 Changes between 1.0.1c and 1.0.1d [5 Feb 2013]
991 *) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.
993 This addresses the flaw in CBC record processing discovered by
994 Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
995 at: http://www.isg.rhul.ac.uk/tls/
997 Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
998 Security Group at Royal Holloway, University of London
999 (www.isg.rhul.ac.uk) for discovering this flaw and Adam Langley and
1000 Emilia Käsper for the initial patch.
1002 [Emilia Käsper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]
1004 *) Fix flaw in AESNI handling of TLS 1.2 and 1.1 records for CBC mode
1005 ciphersuites which can be exploited in a denial of service attack.
1006 Thanks go to and to Adam Langley <agl@chromium.org> for discovering
1007 and detecting this bug and to Wolfgang Ettlinger
1008 <wolfgang.ettlinger@gmail.com> for independently discovering this issue.
1012 *) Return an error when checking OCSP signatures when key is NULL.
1013 This fixes a DoS attack. (CVE-2013-0166)
1016 *) Make openssl verify return errors.
1017 [Chris Palmer <palmer@google.com> and Ben Laurie]
1019 *) Call OCSP Stapling callback after ciphersuite has been chosen, so
1020 the right response is stapled. Also change SSL_get_certificate()
1021 so it returns the certificate actually sent.
1022 See http://rt.openssl.org/Ticket/Display.html?id=2836.
1023 [Rob Stradling <rob.stradling@comodo.com>]
1025 *) Fix possible deadlock when decoding public keys.
1028 *) Don't use TLS 1.0 record version number in initial client hello
1032 Changes between 1.0.1b and 1.0.1c [10 May 2012]
1034 *) Sanity check record length before skipping explicit IV in TLS
1035 1.2, 1.1 and DTLS to fix DoS attack.
1037 Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
1038 fuzzing as a service testing platform.
1042 *) Initialise tkeylen properly when encrypting CMS messages.
1043 Thanks to Solar Designer of Openwall for reporting this issue.
1046 *) In FIPS mode don't try to use composite ciphers as they are not
1050 Changes between 1.0.1a and 1.0.1b [26 Apr 2012]
1052 *) OpenSSL 1.0.0 sets SSL_OP_ALL to 0x80000FFFL and OpenSSL 1.0.1 and
1053 1.0.1a set SSL_OP_NO_TLSv1_1 to 0x00000400L which would unfortunately
1054 mean any application compiled against OpenSSL 1.0.0 headers setting
1055 SSL_OP_ALL would also set SSL_OP_NO_TLSv1_1, unintentionally disablng
1056 TLS 1.1 also. Fix this by changing the value of SSL_OP_NO_TLSv1_1 to
1057 0x10000000L Any application which was previously compiled against
1058 OpenSSL 1.0.1 or 1.0.1a headers and which cares about SSL_OP_NO_TLSv1_1
1059 will need to be recompiled as a result. Letting be results in
1060 inability to disable specifically TLS 1.1 and in client context,
1061 in unlike event, limit maximum offered version to TLS 1.0 [see below].
1064 *) In order to ensure interoperabilty SSL_OP_NO_protocolX does not
1065 disable just protocol X, but all protocols above X *if* there are
1066 protocols *below* X still enabled. In more practical terms it means
1067 that if application wants to disable TLS1.0 in favor of TLS1.1 and
1068 above, it's not sufficient to pass SSL_OP_NO_TLSv1, one has to pass
1069 SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. This applies to
1073 Changes between 1.0.1 and 1.0.1a [19 Apr 2012]
1075 *) Check for potentially exploitable overflows in asn1_d2i_read_bio
1076 BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
1077 in CRYPTO_realloc_clean.
1079 Thanks to Tavis Ormandy, Google Security Team, for discovering this
1080 issue and to Adam Langley <agl@chromium.org> for fixing it.
1082 [Adam Langley (Google), Tavis Ormandy, Google Security Team]
1084 *) Don't allow TLS 1.2 SHA-256 ciphersuites in TLS 1.0, 1.1 connections.
1087 *) Workarounds for some broken servers that "hang" if a client hello
1088 record length exceeds 255 bytes.
1090 1. Do not use record version number > TLS 1.0 in initial client
1091 hello: some (but not all) hanging servers will now work.
1092 2. If we set OPENSSL_MAX_TLS1_2_CIPHER_LENGTH this will truncate
1093 the number of ciphers sent in the client hello. This should be
1094 set to an even number, such as 50, for example by passing:
1095 -DOPENSSL_MAX_TLS1_2_CIPHER_LENGTH=50 to config or Configure.
1096 Most broken servers should now work.
1097 3. If all else fails setting OPENSSL_NO_TLS1_2_CLIENT will disable
1098 TLS 1.2 client support entirely.
1101 *) Fix SEGV in Vector Permutation AES module observed in OpenSSH.
1104 Changes between 1.0.0h and 1.0.1 [14 Mar 2012]
1106 *) Add compatibility with old MDC2 signatures which use an ASN1 OCTET
1107 STRING form instead of a DigestInfo.
1110 *) The format used for MDC2 RSA signatures is inconsistent between EVP
1111 and the RSA_sign/RSA_verify functions. This was made more apparent when
1112 OpenSSL used RSA_sign/RSA_verify for some RSA signatures in particular
1113 those which went through EVP_PKEY_METHOD in 1.0.0 and later. Detect
1114 the correct format in RSA_verify so both forms transparently work.
1117 *) Some servers which support TLS 1.0 can choke if we initially indicate
1118 support for TLS 1.2 and later renegotiate using TLS 1.0 in the RSA
1119 encrypted premaster secret. As a workaround use the maximum permitted
1120 client version in client hello, this should keep such servers happy
1121 and still work with previous versions of OpenSSL.
1124 *) Add support for TLS/DTLS heartbeats.
1125 [Robin Seggelmann <seggelmann@fh-muenster.de>]
1127 *) Add support for SCTP.
1128 [Robin Seggelmann <seggelmann@fh-muenster.de>]
1130 *) Improved PRNG seeding for VOS.
1131 [Paul Green <Paul.Green@stratus.com>]
1133 *) Extensive assembler packs updates, most notably:
1135 - x86[_64]: AES-NI, PCLMULQDQ, RDRAND support;
1136 - x86[_64]: SSSE3 support (SHA1, vector-permutation AES);
1137 - x86_64: bit-sliced AES implementation;
1138 - ARM: NEON support, contemporary platforms optimizations;
1139 - s390x: z196 support;
1140 - *: GHASH and GF(2^m) multiplication implementations;
1144 *) Make TLS-SRP code conformant with RFC 5054 API cleanup
1145 (removal of unnecessary code)
1146 [Peter Sylvester <peter.sylvester@edelweb.fr>]
1148 *) Add TLS key material exporter from RFC 5705.
1151 *) Add DTLS-SRTP negotiation from RFC 5764.
1154 *) Add Next Protocol Negotiation,
1155 http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-00. Can be
1156 disabled with a no-npn flag to config or Configure. Code donated
1158 [Adam Langley <agl@google.com> and Ben Laurie]
1160 *) Add optional 64-bit optimized implementations of elliptic curves NIST-P224,
1161 NIST-P256, NIST-P521, with constant-time single point multiplication on
1162 typical inputs. Compiler support for the nonstandard type __uint128_t is
1163 required to use this (present in gcc 4.4 and later, for 64-bit builds).
1164 Code made available under Apache License version 2.0.
1166 Specify "enable-ec_nistp_64_gcc_128" on the Configure (or config) command
1167 line to include this in your build of OpenSSL, and run "make depend" (or
1168 "make update"). This enables the following EC_METHODs:
1170 EC_GFp_nistp224_method()
1171 EC_GFp_nistp256_method()
1172 EC_GFp_nistp521_method()
1174 EC_GROUP_new_by_curve_name() will automatically use these (while
1175 EC_GROUP_new_curve_GFp() currently prefers the more flexible
1177 [Emilia Käsper, Adam Langley, Bodo Moeller (Google)]
1179 *) Use type ossl_ssize_t instad of ssize_t which isn't available on
1180 all platforms. Move ssize_t definition from e_os.h to the public
1181 header file e_os2.h as it now appears in public header file cms.h
1184 *) New -sigopt option to the ca, req and x509 utilities. Additional
1185 signature parameters can be passed using this option and in
1189 *) Add RSA PSS signing function. This will generate and set the
1190 appropriate AlgorithmIdentifiers for PSS based on those in the
1191 corresponding EVP_MD_CTX structure. No application support yet.
1194 *) Support for companion algorithm specific ASN1 signing routines.
1195 New function ASN1_item_sign_ctx() signs a pre-initialised
1196 EVP_MD_CTX structure and sets AlgorithmIdentifiers based on
1197 the appropriate parameters.
1200 *) Add new algorithm specific ASN1 verification initialisation function
1201 to EVP_PKEY_ASN1_METHOD: this is not in EVP_PKEY_METHOD since the ASN1
1202 handling will be the same no matter what EVP_PKEY_METHOD is used.
1203 Add a PSS handler to support verification of PSS signatures: checked
1204 against a number of sample certificates.
1207 *) Add signature printing for PSS. Add PSS OIDs.
1208 [Steve Henson, Martin Kaiser <lists@kaiser.cx>]
1210 *) Add algorithm specific signature printing. An individual ASN1 method
1211 can now print out signatures instead of the standard hex dump.
1213 More complex signatures (e.g. PSS) can print out more meaningful
1214 information. Include DSA version that prints out the signature
1218 *) Password based recipient info support for CMS library: implementing
1222 *) Split password based encryption into PBES2 and PBKDF2 functions. This
1223 neatly separates the code into cipher and PBE sections and is required
1224 for some algorithms that split PBES2 into separate pieces (such as
1225 password based CMS).
1228 *) Session-handling fixes:
1229 - Fix handling of connections that are resuming with a session ID,
1230 but also support Session Tickets.
1231 - Fix a bug that suppressed issuing of a new ticket if the client
1232 presented a ticket with an expired session.
1233 - Try to set the ticket lifetime hint to something reasonable.
1234 - Make tickets shorter by excluding irrelevant information.
1235 - On the client side, don't ignore renewed tickets.
1236 [Adam Langley, Bodo Moeller (Google)]
1238 *) Fix PSK session representation.
1241 *) Add RC4-MD5 and AESNI-SHA1 "stitched" implementations.
1243 This work was sponsored by Intel.
1246 *) Add GCM support to TLS library. Some custom code is needed to split
1247 the IV between the fixed (from PRF) and explicit (from TLS record)
1248 portions. This adds all GCM ciphersuites supported by RFC5288 and
1249 RFC5289. Generalise some AES* cipherstrings to include GCM and
1250 add a special AESGCM string for GCM only.
1253 *) Expand range of ctrls for AES GCM. Permit setting invocation
1254 field on decrypt and retrieval of invocation field only on encrypt.
1257 *) Add HMAC ECC ciphersuites from RFC5289. Include SHA384 PRF support.
1258 As required by RFC5289 these ciphersuites cannot be used if for
1259 versions of TLS earlier than 1.2.
1262 *) For FIPS capable OpenSSL interpret a NULL default public key method
1263 as unset and return the appropriate default but do *not* set the default.
1264 This means we can return the appropriate method in applications that
1265 switch between FIPS and non-FIPS modes.
1268 *) Redirect HMAC and CMAC operations to FIPS module in FIPS mode. If an
1269 ENGINE is used then we cannot handle that in the FIPS module so we
1270 keep original code iff non-FIPS operations are allowed.
1273 *) Add -attime option to openssl utilities.
1274 [Peter Eckersley <pde@eff.org>, Ben Laurie and Steve Henson]
1276 *) Redirect DSA and DH operations to FIPS module in FIPS mode.
1279 *) Redirect ECDSA and ECDH operations to FIPS module in FIPS mode. Also use
1280 FIPS EC methods unconditionally for now.
1283 *) New build option no-ec2m to disable characteristic 2 code.
1286 *) Backport libcrypto audit of return value checking from 1.1.0-dev; not
1287 all cases can be covered as some introduce binary incompatibilities.
1290 *) Redirect RSA operations to FIPS module including keygen,
1291 encrypt, decrypt, sign and verify. Block use of non FIPS RSA methods.
1294 *) Add similar low level API blocking to ciphers.
1297 *) Low level digest APIs are not approved in FIPS mode: any attempt
1298 to use these will cause a fatal error. Applications that *really* want
1299 to use them can use the private_* version instead.
1302 *) Redirect cipher operations to FIPS module for FIPS builds.
1305 *) Redirect digest operations to FIPS module for FIPS builds.
1308 *) Update build system to add "fips" flag which will link in fipscanister.o
1309 for static and shared library builds embedding a signature if needed.
1312 *) Output TLS supported curves in preference order instead of numerical
1313 order. This is currently hardcoded for the highest order curves first.
1314 This should be configurable so applications can judge speed vs strength.
1317 *) Add TLS v1.2 server support for client authentication.
1320 *) Add support for FIPS mode in ssl library: disable SSLv3, non-FIPS ciphers
1324 *) Functions FIPS_mode_set() and FIPS_mode() which call the underlying
1325 FIPS modules versions.
1328 *) Add TLS v1.2 client side support for client authentication. Keep cache
1329 of handshake records longer as we don't know the hash algorithm to use
1330 until after the certificate request message is received.
1333 *) Initial TLS v1.2 client support. Add a default signature algorithms
1334 extension including all the algorithms we support. Parse new signature
1335 format in client key exchange. Relax some ECC signing restrictions for
1336 TLS v1.2 as indicated in RFC5246.
1339 *) Add server support for TLS v1.2 signature algorithms extension. Switch
1340 to new signature format when needed using client digest preference.
1341 All server ciphersuites should now work correctly in TLS v1.2. No client
1342 support yet and no support for client certificates.
1345 *) Initial TLS v1.2 support. Add new SHA256 digest to ssl code, switch
1346 to SHA256 for PRF when using TLS v1.2 and later. Add new SHA256 based
1347 ciphersuites. At present only RSA key exchange ciphersuites work with
1348 TLS v1.2. Add new option for TLS v1.2 replacing the old and obsolete
1349 SSL_OP_PKCS1_CHECK flags with SSL_OP_NO_TLSv1_2. New TLSv1.2 methods
1350 and version checking.
1353 *) New option OPENSSL_NO_SSL_INTERN. If an application can be compiled
1354 with this defined it will not be affected by any changes to ssl internal
1355 structures. Add several utility functions to allow openssl application
1356 to work with OPENSSL_NO_SSL_INTERN defined.
1360 [Tom Wu <tjw@cs.stanford.edu> and Ben Laurie]
1362 *) Add functions to copy EVP_PKEY_METHOD and retrieve flags and id.
1365 *) Permit abbreviated handshakes when renegotiating using the function
1366 SSL_renegotiate_abbreviated().
1367 [Robin Seggelmann <seggelmann@fh-muenster.de>]
1369 *) Add call to ENGINE_register_all_complete() to
1370 ENGINE_load_builtin_engines(), so some implementations get used
1371 automatically instead of needing explicit application support.
1374 *) Add support for TLS key exporter as described in RFC5705.
1375 [Robin Seggelmann <seggelmann@fh-muenster.de>, Steve Henson]
1377 *) Initial TLSv1.1 support. Since TLSv1.1 is very similar to TLS v1.0 only
1378 a few changes are required:
1380 Add SSL_OP_NO_TLSv1_1 flag.
1381 Add TLSv1_1 methods.
1382 Update version checking logic to handle version 1.1.
1383 Add explicit IV handling (ported from DTLS code).
1384 Add command line options to s_client/s_server.
1387 Changes between 1.0.0j and 1.0.0k [5 Feb 2013]
1389 *) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.
1391 This addresses the flaw in CBC record processing discovered by
1392 Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
1393 at: http://www.isg.rhul.ac.uk/tls/
1395 Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
1396 Security Group at Royal Holloway, University of London
1397 (www.isg.rhul.ac.uk) for discovering this flaw and Adam Langley and
1398 Emilia Käsper for the initial patch.
1400 [Emilia Käsper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]
1402 *) Return an error when checking OCSP signatures when key is NULL.
1403 This fixes a DoS attack. (CVE-2013-0166)
1406 *) Call OCSP Stapling callback after ciphersuite has been chosen, so
1407 the right response is stapled. Also change SSL_get_certificate()
1408 so it returns the certificate actually sent.
1409 See http://rt.openssl.org/Ticket/Display.html?id=2836.
1410 (This is a backport)
1411 [Rob Stradling <rob.stradling@comodo.com>]
1413 *) Fix possible deadlock when decoding public keys.
1416 Changes between 1.0.0i and 1.0.0j [10 May 2012]
1418 [NB: OpenSSL 1.0.0i and later 1.0.0 patch levels were released after
1421 *) Sanity check record length before skipping explicit IV in DTLS
1424 Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
1425 fuzzing as a service testing platform.
1429 *) Initialise tkeylen properly when encrypting CMS messages.
1430 Thanks to Solar Designer of Openwall for reporting this issue.
1433 Changes between 1.0.0h and 1.0.0i [19 Apr 2012]
1435 *) Check for potentially exploitable overflows in asn1_d2i_read_bio
1436 BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
1437 in CRYPTO_realloc_clean.
1439 Thanks to Tavis Ormandy, Google Security Team, for discovering this
1440 issue and to Adam Langley <agl@chromium.org> for fixing it.
1442 [Adam Langley (Google), Tavis Ormandy, Google Security Team]
1444 Changes between 1.0.0g and 1.0.0h [12 Mar 2012]
1446 *) Fix MMA (Bleichenbacher's attack on PKCS #1 v1.5 RSA padding) weakness
1447 in CMS and PKCS7 code. When RSA decryption fails use a random key for
1448 content decryption and always return the same error. Note: this attack
1449 needs on average 2^20 messages so it only affects automated senders. The
1450 old behaviour can be reenabled in the CMS code by setting the
1451 CMS_DEBUG_DECRYPT flag: this is useful for debugging and testing where
1452 an MMA defence is not necessary.
1453 Thanks to Ivan Nestlerode <inestlerode@us.ibm.com> for discovering
1454 this issue. (CVE-2012-0884)
1457 *) Fix CVE-2011-4619: make sure we really are receiving a
1458 client hello before rejecting multiple SGC restarts. Thanks to
1459 Ivan Nestlerode <inestlerode@us.ibm.com> for discovering this bug.
1462 Changes between 1.0.0f and 1.0.0g [18 Jan 2012]
1464 *) Fix for DTLS DoS issue introduced by fix for CVE-2011-4109.
1465 Thanks to Antonio Martin, Enterprise Secure Access Research and
1466 Development, Cisco Systems, Inc. for discovering this bug and
1467 preparing a fix. (CVE-2012-0050)
1470 Changes between 1.0.0e and 1.0.0f [4 Jan 2012]
1472 *) Nadhem Alfardan and Kenny Paterson have discovered an extension
1473 of the Vaudenay padding oracle attack on CBC mode encryption
1474 which enables an efficient plaintext recovery attack against
1475 the OpenSSL implementation of DTLS. Their attack exploits timing
1476 differences arising during decryption processing. A research
1477 paper describing this attack can be found at:
1478 http://www.isg.rhul.ac.uk/~kp/dtls.pdf
1479 Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
1480 Security Group at Royal Holloway, University of London
1481 (www.isg.rhul.ac.uk) for discovering this flaw and to Robin Seggelmann
1482 <seggelmann@fh-muenster.de> and Michael Tuexen <tuexen@fh-muenster.de>
1483 for preparing the fix. (CVE-2011-4108)
1484 [Robin Seggelmann, Michael Tuexen]
1486 *) Clear bytes used for block padding of SSL 3.0 records.
1488 [Adam Langley (Google)]
1490 *) Only allow one SGC handshake restart for SSL/TLS. Thanks to George
1491 Kadianakis <desnacked@gmail.com> for discovering this issue and
1492 Adam Langley for preparing the fix. (CVE-2011-4619)
1493 [Adam Langley (Google)]
1495 *) Check parameters are not NULL in GOST ENGINE. (CVE-2012-0027)
1496 [Andrey Kulikov <amdeich@gmail.com>]
1498 *) Prevent malformed RFC3779 data triggering an assertion failure.
1499 Thanks to Andrew Chi, BBN Technologies, for discovering the flaw
1500 and Rob Austein <sra@hactrn.net> for fixing it. (CVE-2011-4577)
1501 [Rob Austein <sra@hactrn.net>]
1503 *) Improved PRNG seeding for VOS.
1504 [Paul Green <Paul.Green@stratus.com>]
1506 *) Fix ssl_ciph.c set-up race.
1507 [Adam Langley (Google)]
1509 *) Fix spurious failures in ecdsatest.c.
1510 [Emilia Käsper (Google)]
1512 *) Fix the BIO_f_buffer() implementation (which was mixing different
1513 interpretations of the '..._len' fields).
1514 [Adam Langley (Google)]
1516 *) Fix handling of BN_BLINDING: now BN_BLINDING_invert_ex (rather than
1517 BN_BLINDING_invert_ex) calls BN_BLINDING_update, ensuring that concurrent
1518 threads won't reuse the same blinding coefficients.
1520 This also avoids the need to obtain the CRYPTO_LOCK_RSA_BLINDING
1521 lock to call BN_BLINDING_invert_ex, and avoids one use of
1522 BN_BLINDING_update for each BN_BLINDING structure (previously,
1523 the last update always remained unused).
1524 [Emilia Käsper (Google)]
1526 *) In ssl3_clear, preserve s3->init_extra along with s3->rbuf.
1527 [Bob Buckholz (Google)]
1529 Changes between 1.0.0d and 1.0.0e [6 Sep 2011]
1531 *) Fix bug where CRLs with nextUpdate in the past are sometimes accepted
1532 by initialising X509_STORE_CTX properly. (CVE-2011-3207)
1533 [Kaspar Brand <ossl@velox.ch>]
1535 *) Fix SSL memory handling for (EC)DH ciphersuites, in particular
1536 for multi-threaded use of ECDH. (CVE-2011-3210)
1537 [Adam Langley (Google)]
1539 *) Fix x509_name_ex_d2i memory leak on bad inputs.
1542 *) Remove hard coded ecdsaWithSHA1 signature tests in ssl code and check
1543 signature public key algorithm by using OID xref utilities instead.
1544 Before this you could only use some ECC ciphersuites with SHA1 only.
1547 *) Add protection against ECDSA timing attacks as mentioned in the paper
1548 by Billy Bob Brumley and Nicola Tuveri, see:
1550 http://eprint.iacr.org/2011/232.pdf
1552 [Billy Bob Brumley and Nicola Tuveri]
1554 Changes between 1.0.0c and 1.0.0d [8 Feb 2011]
1556 *) Fix parsing of OCSP stapling ClientHello extension. CVE-2011-0014
1557 [Neel Mehta, Adam Langley, Bodo Moeller (Google)]
1559 *) Fix bug in string printing code: if *any* escaping is enabled we must
1560 escape the escape character (backslash) or the resulting string is
1564 Changes between 1.0.0b and 1.0.0c [2 Dec 2010]
1566 *) Disable code workaround for ancient and obsolete Netscape browsers
1567 and servers: an attacker can use it in a ciphersuite downgrade attack.
1568 Thanks to Martin Rex for discovering this bug. CVE-2010-4180
1571 *) Fixed J-PAKE implementation error, originally discovered by
1572 Sebastien Martini, further info and confirmation from Stefan
1573 Arentz and Feng Hao. Note that this fix is a security fix. CVE-2010-4252
1576 Changes between 1.0.0a and 1.0.0b [16 Nov 2010]
1578 *) Fix extension code to avoid race conditions which can result in a buffer
1579 overrun vulnerability: resumed sessions must not be modified as they can
1580 be shared by multiple threads. CVE-2010-3864
1583 *) Fix WIN32 build system to correctly link an ENGINE directory into
1587 Changes between 1.0.0 and 1.0.0a [01 Jun 2010]
1589 *) Check return value of int_rsa_verify in pkey_rsa_verifyrecover
1591 [Steve Henson, Peter-Michael Hager <hager@dortmund.net>]
1593 Changes between 0.9.8n and 1.0.0 [29 Mar 2010]
1595 *) Add "missing" function EVP_CIPHER_CTX_copy(). This copies a cipher
1596 context. The operation can be customised via the ctrl mechanism in
1597 case ENGINEs want to include additional functionality.
1600 *) Tolerate yet another broken PKCS#8 key format: private key value negative.
1603 *) Add new -subject_hash_old and -issuer_hash_old options to x509 utility to
1604 output hashes compatible with older versions of OpenSSL.
1605 [Willy Weisz <weisz@vcpc.univie.ac.at>]
1607 *) Fix compression algorithm handling: if resuming a session use the
1608 compression algorithm of the resumed session instead of determining
1609 it from client hello again. Don't allow server to change algorithm.
1612 *) Add load_crls() function to apps tidying load_certs() too. Add option
1613 to verify utility to allow additional CRLs to be included.
1616 *) Update OCSP request code to permit adding custom headers to the request:
1617 some responders need this.
1620 *) The function EVP_PKEY_sign() returns <=0 on error: check return code
1622 [Julia Lawall <julia@diku.dk>]
1624 *) Update verify callback code in apps/s_cb.c and apps/verify.c, it
1625 needlessly dereferenced structures, used obsolete functions and
1626 didn't handle all updated verify codes correctly.
1629 *) Disable MD2 in the default configuration.
1632 *) In BIO_pop() and BIO_push() use the ctrl argument (which was NULL) to
1633 indicate the initial BIO being pushed or popped. This makes it possible
1634 to determine whether the BIO is the one explicitly called or as a result
1635 of the ctrl being passed down the chain. Fix BIO_pop() and SSL BIOs so
1636 it handles reference counts correctly and doesn't zero out the I/O bio
1637 when it is not being explicitly popped. WARNING: applications which
1638 included workarounds for the old buggy behaviour will need to be modified
1639 or they could free up already freed BIOs.
1642 *) Extend the uni2asc/asc2uni => OPENSSL_uni2asc/OPENSSL_asc2uni
1643 renaming to all platforms (within the 0.9.8 branch, this was
1644 done conditionally on Netware platforms to avoid a name clash).
1645 [Guenter <lists@gknw.net>]
1647 *) Add ECDHE and PSK support to DTLS.
1648 [Michael Tuexen <tuexen@fh-muenster.de>]
1650 *) Add CHECKED_STACK_OF macro to safestack.h, otherwise safestack can't
1654 *) Add "missing" function EVP_MD_flags() (without this the only way to
1655 retrieve a digest flags is by accessing the structure directly. Update
1656 EVP_MD_do_all*() and EVP_CIPHER_do_all*() to include the name a digest
1657 or cipher is registered as in the "from" argument. Print out all
1658 registered digests in the dgst usage message instead of manually
1659 attempting to work them out.
1662 *) If no SSLv2 ciphers are used don't use an SSLv2 compatible client hello:
1663 this allows the use of compression and extensions. Change default cipher
1664 string to remove SSLv2 ciphersuites. This effectively avoids ancient SSLv2
1665 by default unless an application cipher string requests it.
1668 *) Alter match criteria in PKCS12_parse(). It used to try to use local
1669 key ids to find matching certificates and keys but some PKCS#12 files
1670 don't follow the (somewhat unwritten) rules and this strategy fails.
1671 Now just gather all certificates together and the first private key
1672 then look for the first certificate that matches the key.
1675 *) Support use of registered digest and cipher names for dgst and cipher
1676 commands instead of having to add each one as a special case. So now
1683 openssl dgst -sha256 foo
1685 and this works for ENGINE based algorithms too.
1689 *) Update Gost ENGINE to support parameter files.
1690 [Victor B. Wagner <vitus@cryptocom.ru>]
1692 *) Support GeneralizedTime in ca utility.
1693 [Oliver Martin <oliver@volatilevoid.net>, Steve Henson]
1695 *) Enhance the hash format used for certificate directory links. The new
1696 form uses the canonical encoding (meaning equivalent names will work
1697 even if they aren't identical) and uses SHA1 instead of MD5. This form
1698 is incompatible with the older format and as a result c_rehash should
1699 be used to rebuild symbolic links.
1702 *) Make PKCS#8 the default write format for private keys, replacing the
1703 traditional format. This form is standardised, more secure and doesn't
1704 include an implicit MD5 dependency.
1707 *) Add a $gcc_devteam_warn option to Configure. The idea is that any code
1708 committed to OpenSSL should pass this lot as a minimum.
1711 *) Add session ticket override functionality for use by EAP-FAST.
1712 [Jouni Malinen <j@w1.fi>]
1714 *) Modify HMAC functions to return a value. Since these can be implemented
1715 in an ENGINE errors can occur.
1718 *) Type-checked OBJ_bsearch_ex.
1721 *) Type-checked OBJ_bsearch. Also some constification necessitated
1722 by type-checking. Still to come: TXT_DB, bsearch(?),
1723 OBJ_bsearch_ex, qsort, CRYPTO_EX_DATA, ASN1_VALUE, ASN1_STRING,
1727 *) New function OPENSSL_gmtime_adj() to add a specific number of days and
1728 seconds to a tm structure directly, instead of going through OS
1729 specific date routines. This avoids any issues with OS routines such
1730 as the year 2038 bug. New *_adj() functions for ASN1 time structures
1731 and X509_time_adj_ex() to cover the extended range. The existing
1732 X509_time_adj() is still usable and will no longer have any date issues.
1735 *) Delta CRL support. New use deltas option which will attempt to locate
1736 and search any appropriate delta CRLs available.
1738 This work was sponsored by Google.
1741 *) Support for CRLs partitioned by reason code. Reorganise CRL processing
1742 code and add additional score elements. Validate alternate CRL paths
1743 as part of the CRL checking and indicate a new error "CRL path validation
1744 error" in this case. Applications wanting additional details can use
1745 the verify callback and check the new "parent" field. If this is not
1746 NULL CRL path validation is taking place. Existing applications wont
1747 see this because it requires extended CRL support which is off by
1750 This work was sponsored by Google.
1753 *) Support for freshest CRL extension.
1755 This work was sponsored by Google.
1758 *) Initial indirect CRL support. Currently only supported in the CRLs
1759 passed directly and not via lookup. Process certificate issuer
1760 CRL entry extension and lookup CRL entries by bother issuer name
1761 and serial number. Check and process CRL issuer entry in IDP extension.
1763 This work was sponsored by Google.
1766 *) Add support for distinct certificate and CRL paths. The CRL issuer
1767 certificate is validated separately in this case. Only enabled if
1768 an extended CRL support flag is set: this flag will enable additional
1769 CRL functionality in future.
1771 This work was sponsored by Google.
1774 *) Add support for policy mappings extension.
1776 This work was sponsored by Google.
1779 *) Fixes to pathlength constraint, self issued certificate handling,
1780 policy processing to align with RFC3280 and PKITS tests.
1782 This work was sponsored by Google.
1785 *) Support for name constraints certificate extension. DN, email, DNS
1786 and URI types are currently supported.
1788 This work was sponsored by Google.
1791 *) To cater for systems that provide a pointer-based thread ID rather
1792 than numeric, deprecate the current numeric thread ID mechanism and
1793 replace it with a structure and associated callback type. This
1794 mechanism allows a numeric "hash" to be extracted from a thread ID in
1795 either case, and on platforms where pointers are larger than 'long',
1796 mixing is done to help ensure the numeric 'hash' is usable even if it
1797 can't be guaranteed unique. The default mechanism is to use "&errno"
1798 as a pointer-based thread ID to distinguish between threads.
1800 Applications that want to provide their own thread IDs should now use
1801 CRYPTO_THREADID_set_callback() to register a callback that will call
1802 either CRYPTO_THREADID_set_numeric() or CRYPTO_THREADID_set_pointer().
1804 Note that ERR_remove_state() is now deprecated, because it is tied
1805 to the assumption that thread IDs are numeric. ERR_remove_state(0)
1806 to free the current thread's error state should be replaced by
1807 ERR_remove_thread_state(NULL).
1809 (This new approach replaces the functions CRYPTO_set_idptr_callback(),
1810 CRYPTO_get_idptr_callback(), and CRYPTO_thread_idptr() that existed in
1811 OpenSSL 0.9.9-dev between June 2006 and August 2008. Also, if an
1812 application was previously providing a numeric thread callback that
1813 was inappropriate for distinguishing threads, then uniqueness might
1814 have been obtained with &errno that happened immediately in the
1815 intermediate development versions of OpenSSL; this is no longer the
1816 case, the numeric thread callback will now override the automatic use
1818 [Geoff Thorpe, with help from Bodo Moeller]
1820 *) Initial support for different CRL issuing certificates. This covers a
1821 simple case where the self issued certificates in the chain exist and
1822 the real CRL issuer is higher in the existing chain.
1824 This work was sponsored by Google.
1827 *) Removed effectively defunct crypto/store from the build.
1830 *) Revamp of STACK to provide stronger type-checking. Still to come:
1831 TXT_DB, bsearch(?), OBJ_bsearch, qsort, CRYPTO_EX_DATA, ASN1_VALUE,
1832 ASN1_STRING, CONF_VALUE.
1835 *) Add a new SSL_MODE_RELEASE_BUFFERS mode flag to release unused buffer
1836 RAM on SSL connections. This option can save about 34k per idle SSL.
1839 *) Revamp of LHASH to provide stronger type-checking. Still to come:
1840 STACK, TXT_DB, bsearch, qsort.
1843 *) Initial support for Cryptographic Message Syntax (aka CMS) based
1844 on RFC3850, RFC3851 and RFC3852. New cms directory and cms utility,
1845 support for data, signedData, compressedData, digestedData and
1846 encryptedData, envelopedData types included. Scripts to check against
1847 RFC4134 examples draft and interop and consistency checks of many
1848 content types and variants.
1851 *) Add options to enc utility to support use of zlib compression BIO.
1854 *) Extend mk1mf to support importing of options and assembly language
1855 files from Configure script, currently only included in VC-WIN32.
1856 The assembly language rules can now optionally generate the source
1857 files from the associated perl scripts.
1860 *) Implement remaining functionality needed to support GOST ciphersuites.
1861 Interop testing has been performed using CryptoPro implementations.
1862 [Victor B. Wagner <vitus@cryptocom.ru>]
1864 *) s390x assembler pack.
1867 *) ARMv4 assembler pack. ARMv4 refers to v4 and later ISA, not CPU
1871 *) Implement Opaque PRF Input TLS extension as specified in
1872 draft-rescorla-tls-opaque-prf-input-00.txt. Since this is not an
1873 official specification yet and no extension type assignment by
1874 IANA exists, this extension (for now) will have to be explicitly
1875 enabled when building OpenSSL by providing the extension number
1876 to use. For example, specify an option
1878 -DTLSEXT_TYPE_opaque_prf_input=0x9527
1880 to the "config" or "Configure" script to enable the extension,
1881 assuming extension number 0x9527 (which is a completely arbitrary
1882 and unofficial assignment based on the MD5 hash of the Internet
1883 Draft). Note that by doing so, you potentially lose
1884 interoperability with other TLS implementations since these might
1885 be using the same extension number for other purposes.
1887 SSL_set_tlsext_opaque_prf_input(ssl, src, len) is used to set the
1888 opaque PRF input value to use in the handshake. This will create
1889 an interal copy of the length-'len' string at 'src', and will
1890 return non-zero for success.
1892 To get more control and flexibility, provide a callback function
1895 SSL_CTX_set_tlsext_opaque_prf_input_callback(ctx, cb)
1896 SSL_CTX_set_tlsext_opaque_prf_input_callback_arg(ctx, arg)
1900 int (*cb)(SSL *, void *peerinput, size_t len, void *arg);
1903 Callback function 'cb' will be called in handshakes, and is
1904 expected to use SSL_set_tlsext_opaque_prf_input() as appropriate.
1905 Argument 'arg' is for application purposes (the value as given to
1906 SSL_CTX_set_tlsext_opaque_prf_input_callback_arg() will directly
1907 be provided to the callback function). The callback function
1908 has to return non-zero to report success: usually 1 to use opaque
1909 PRF input just if possible, or 2 to enforce use of the opaque PRF
1910 input. In the latter case, the library will abort the handshake
1911 if opaque PRF input is not successfully negotiated.
1913 Arguments 'peerinput' and 'len' given to the callback function
1914 will always be NULL and 0 in the case of a client. A server will
1915 see the client's opaque PRF input through these variables if
1916 available (NULL and 0 otherwise). Note that if the server
1917 provides an opaque PRF input, the length must be the same as the
1918 length of the client's opaque PRF input.
1920 Note that the callback function will only be called when creating
1921 a new session (session resumption can resume whatever was
1922 previously negotiated), and will not be called in SSL 2.0
1923 handshakes; thus, SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) or
1924 SSL_set_options(ssl, SSL_OP_NO_SSLv2) is especially recommended
1925 for applications that need to enforce opaque PRF input.
1929 *) Update ssl code to support digests other than SHA1+MD5 for handshake
1932 [Victor B. Wagner <vitus@cryptocom.ru>]
1934 *) Add RFC4507 support to OpenSSL. This includes the corrections in
1935 RFC4507bis. The encrypted ticket format is an encrypted encoded
1936 SSL_SESSION structure, that way new session features are automatically
1939 If a client application caches session in an SSL_SESSION structure
1940 support is transparent because tickets are now stored in the encoded
1943 The SSL_CTX structure automatically generates keys for ticket
1944 protection in servers so again support should be possible
1945 with no application modification.
1947 If a client or server wishes to disable RFC4507 support then the option
1948 SSL_OP_NO_TICKET can be set.
1950 Add a TLS extension debugging callback to allow the contents of any client
1951 or server extensions to be examined.
1953 This work was sponsored by Google.
1956 *) Final changes to avoid use of pointer pointer casts in OpenSSL.
1957 OpenSSL should now compile cleanly on gcc 4.2
1958 [Peter Hartley <pdh@utter.chaos.org.uk>, Steve Henson]
1960 *) Update SSL library to use new EVP_PKEY MAC API. Include generic MAC
1961 support including streaming MAC support: this is required for GOST
1962 ciphersuite support.
1963 [Victor B. Wagner <vitus@cryptocom.ru>, Steve Henson]
1965 *) Add option -stream to use PKCS#7 streaming in smime utility. New
1966 function i2d_PKCS7_bio_stream() and PEM_write_PKCS7_bio_stream()
1967 to output in BER and PEM format.
1970 *) Experimental support for use of HMAC via EVP_PKEY interface. This
1971 allows HMAC to be handled via the EVP_DigestSign*() interface. The
1972 EVP_PKEY "key" in this case is the HMAC key, potentially allowing
1973 ENGINE support for HMAC keys which are unextractable. New -mac and
1974 -macopt options to dgst utility.
1977 *) New option -sigopt to dgst utility. Update dgst to use
1978 EVP_Digest{Sign,Verify}*. These two changes make it possible to use
1979 alternative signing paramaters such as X9.31 or PSS in the dgst
1983 *) Change ssl_cipher_apply_rule(), the internal function that does
1984 the work each time a ciphersuite string requests enabling
1985 ("foo+bar"), moving ("+foo+bar"), disabling ("-foo+bar", or
1986 removing ("!foo+bar") a class of ciphersuites: Now it maintains
1987 the order of disabled ciphersuites such that those ciphersuites
1988 that most recently went from enabled to disabled not only stay
1989 in order with respect to each other, but also have higher priority
1990 than other disabled ciphersuites the next time ciphersuites are
1993 This means that you can now say, e.g., "PSK:-PSK:HIGH" to enable
1994 the same ciphersuites as with "HIGH" alone, but in a specific
1995 order where the PSK ciphersuites come first (since they are the
1996 most recently disabled ciphersuites when "HIGH" is parsed).
1998 Also, change ssl_create_cipher_list() (using this new
1999 funcionality) such that between otherwise identical
2000 cihpersuites, ephemeral ECDH is preferred over ephemeral DH in
2004 *) Change ssl_create_cipher_list() so that it automatically
2005 arranges the ciphersuites in reasonable order before starting
2006 to process the rule string. Thus, the definition for "DEFAULT"
2007 (SSL_DEFAULT_CIPHER_LIST) now is just "ALL:!aNULL:!eNULL", but
2008 remains equivalent to "AES:ALL:!aNULL:!eNULL:+aECDH:+kRSA:+RC4:@STRENGTH".
2009 This makes it much easier to arrive at a reasonable default order
2010 in applications for which anonymous ciphers are OK (meaning
2011 that you can't actually use DEFAULT).
2012 [Bodo Moeller; suggested by Victor Duchovni]
2014 *) Split the SSL/TLS algorithm mask (as used for ciphersuite string
2015 processing) into multiple integers instead of setting
2016 "SSL_MKEY_MASK" bits, "SSL_AUTH_MASK" bits, "SSL_ENC_MASK",
2017 "SSL_MAC_MASK", and "SSL_SSL_MASK" bits all in a single integer.
2018 (These masks as well as the individual bit definitions are hidden
2019 away into the non-exported interface ssl/ssl_locl.h, so this
2020 change to the definition of the SSL_CIPHER structure shouldn't
2021 affect applications.) This give us more bits for each of these
2022 categories, so there is no longer a need to coagulate AES128 and
2023 AES256 into a single algorithm bit, and to coagulate Camellia128
2024 and Camellia256 into a single algorithm bit, which has led to all
2027 Thus, among other things, the kludge introduced in 0.9.7m and
2028 0.9.8e for masking out AES256 independently of AES128 or masking
2029 out Camellia256 independently of AES256 is not needed here in 0.9.9.
2031 With the change, we also introduce new ciphersuite aliases that
2032 so far were missing: "AES128", "AES256", "CAMELLIA128", and
2036 *) Add support for dsa-with-SHA224 and dsa-with-SHA256.
2037 Use the leftmost N bytes of the signature input if the input is
2038 larger than the prime q (with N being the size in bytes of q).
2041 *) Very *very* experimental PKCS#7 streaming encoder support. Nothing uses
2042 it yet and it is largely untested.
2045 *) Add support for the ecdsa-with-SHA224/256/384/512 signature types.
2048 *) Initial incomplete changes to avoid need for function casts in OpenSSL
2049 some compilers (gcc 4.2 and later) reject their use. Safestack is
2050 reimplemented. Update ASN1 to avoid use of legacy functions.
2053 *) Win32/64 targets are linked with Winsock2.
2056 *) Add an X509_CRL_METHOD structure to allow CRL processing to be redirected
2057 to external functions. This can be used to increase CRL handling
2058 efficiency especially when CRLs are very large by (for example) storing
2059 the CRL revoked certificates in a database.
2062 *) Overhaul of by_dir code. Add support for dynamic loading of CRLs so
2063 new CRLs added to a directory can be used. New command line option
2064 -verify_return_error to s_client and s_server. This causes real errors
2065 to be returned by the verify callback instead of carrying on no matter
2066 what. This reflects the way a "real world" verify callback would behave.
2069 *) GOST engine, supporting several GOST algorithms and public key formats.
2070 Kindly donated by Cryptocom.
2073 *) Partial support for Issuing Distribution Point CRL extension. CRLs
2074 partitioned by DP are handled but no indirect CRL or reason partitioning
2075 (yet). Complete overhaul of CRL handling: now the most suitable CRL is
2076 selected via a scoring technique which handles IDP and AKID in CRLs.
2079 *) New X509_STORE_CTX callbacks lookup_crls() and lookup_certs() which
2080 will ultimately be used for all verify operations: this will remove the
2081 X509_STORE dependency on certificate verification and allow alternative
2082 lookup methods. X509_STORE based implementations of these two callbacks.
2085 *) Allow multiple CRLs to exist in an X509_STORE with matching issuer names.
2086 Modify get_crl() to find a valid (unexpired) CRL if possible.
2089 *) New function X509_CRL_match() to check if two CRLs are identical. Normally
2090 this would be called X509_CRL_cmp() but that name is already used by
2091 a function that just compares CRL issuer names. Cache several CRL
2092 extensions in X509_CRL structure and cache CRLDP in X509.
2095 *) Store a "canonical" representation of X509_NAME structure (ASN1 Name)
2096 this maps equivalent X509_NAME structures into a consistent structure.
2097 Name comparison can then be performed rapidly using memcmp().
2100 *) Non-blocking OCSP request processing. Add -timeout option to ocsp
2104 *) Allow digests to supply their own micalg string for S/MIME type using
2105 the ctrl EVP_MD_CTRL_MICALG.
2108 *) During PKCS7 signing pass the PKCS7 SignerInfo structure to the
2109 EVP_PKEY_METHOD before and after signing via the EVP_PKEY_CTRL_PKCS7_SIGN
2110 ctrl. It can then customise the structure before and/or after signing
2114 *) New function OBJ_add_sigid() to allow application defined signature OIDs
2115 to be added to OpenSSLs internal tables. New function OBJ_sigid_free()
2116 to free up any added signature OIDs.
2119 *) New functions EVP_CIPHER_do_all(), EVP_CIPHER_do_all_sorted(),
2120 EVP_MD_do_all() and EVP_MD_do_all_sorted() to enumerate internal
2121 digest and cipher tables. New options added to openssl utility:
2122 list-message-digest-algorithms and list-cipher-algorithms.
2125 *) Change the array representation of binary polynomials: the list
2126 of degrees of non-zero coefficients is now terminated with -1.
2127 Previously it was terminated with 0, which was also part of the
2128 value; thus, the array representation was not applicable to
2129 polynomials where t^0 has coefficient zero. This change makes
2130 the array representation useful in a more general context.
2133 *) Various modifications and fixes to SSL/TLS cipher string
2134 handling. For ECC, the code now distinguishes between fixed ECDH
2135 with RSA certificates on the one hand and with ECDSA certificates
2136 on the other hand, since these are separate ciphersuites. The
2137 unused code for Fortezza ciphersuites has been removed.
2139 For consistency with EDH, ephemeral ECDH is now called "EECDH"
2140 (not "ECDHE"). For consistency with the code for DH
2141 certificates, use of ECDH certificates is now considered ECDH
2142 authentication, not RSA or ECDSA authentication (the latter is
2143 merely the CA's signing algorithm and not actively used in the
2146 The temporary ciphersuite alias "ECCdraft" is no longer
2147 available, and ECC ciphersuites are no longer excluded from "ALL"
2148 and "DEFAULT". The following aliases now exist for RFC 4492
2149 ciphersuites, most of these by analogy with the DH case:
2151 kECDHr - ECDH cert, signed with RSA
2152 kECDHe - ECDH cert, signed with ECDSA
2153 kECDH - ECDH cert (signed with either RSA or ECDSA)
2154 kEECDH - ephemeral ECDH
2155 ECDH - ECDH cert or ephemeral ECDH
2161 AECDH - anonymous ECDH
2162 EECDH - non-anonymous ephemeral ECDH (equivalent to "kEECDH:-AECDH")
2166 *) Add additional S/MIME capabilities for AES and GOST ciphers if supported.
2167 Use correct micalg parameters depending on digest(s) in signed message.
2170 *) Add engine support for EVP_PKEY_ASN1_METHOD. Add functions to process
2171 an ENGINE asn1 method. Support ENGINE lookups in the ASN1 code.
2174 *) Initial engine support for EVP_PKEY_METHOD. New functions to permit
2175 an engine to register a method. Add ENGINE lookups for methods and
2176 functional reference processing.
2179 *) New functions EVP_Digest{Sign,Verify)*. These are enchance versions of
2180 EVP_{Sign,Verify}* which allow an application to customise the signature
2184 *) New -resign option to smime utility. This adds one or more signers
2185 to an existing PKCS#7 signedData structure. Also -md option to use an
2186 alternative message digest algorithm for signing.
2189 *) Tidy up PKCS#7 routines and add new functions to make it easier to
2190 create PKCS7 structures containing multiple signers. Update smime
2191 application to support multiple signers.
2194 *) New -macalg option to pkcs12 utility to allow setting of an alternative
2198 *) Initial support for PKCS#5 v2.0 PRFs other than default SHA1 HMAC.
2199 Reorganize PBE internals to lookup from a static table using NIDs,
2200 add support for HMAC PBE OID translation. Add a EVP_CIPHER ctrl:
2201 EVP_CTRL_PBE_PRF_NID this allows a cipher to specify an alternative
2202 PRF which will be automatically used with PBES2.
2205 *) Replace the algorithm specific calls to generate keys in "req" with the
2209 *) Update PKCS#7 enveloped data routines to use new API. This is now
2210 supported by any public key method supporting the encrypt operation. A
2211 ctrl is added to allow the public key algorithm to examine or modify
2212 the PKCS#7 RecipientInfo structure if it needs to: for RSA this is
2216 *) Add a ctrl to asn1 method to allow a public key algorithm to express
2217 a default digest type to use. In most cases this will be SHA1 but some
2218 algorithms (such as GOST) need to specify an alternative digest. The
2219 return value indicates how strong the preference is 1 means optional and
2220 2 is mandatory (that is it is the only supported type). Modify
2221 ASN1_item_sign() to accept a NULL digest argument to indicate it should
2222 use the default md. Update openssl utilities to use the default digest
2223 type for signing if it is not explicitly indicated.
2226 *) Use OID cross reference table in ASN1_sign() and ASN1_verify(). New
2227 EVP_MD flag EVP_MD_FLAG_PKEY_METHOD_SIGNATURE. This uses the relevant
2228 signing method from the key type. This effectively removes the link
2229 between digests and public key types.
2232 *) Add an OID cross reference table and utility functions. Its purpose is to
2233 translate between signature OIDs such as SHA1WithrsaEncryption and SHA1,
2234 rsaEncryption. This will allow some of the algorithm specific hackery
2235 needed to use the correct OID to be removed.
2238 *) Remove algorithm specific dependencies when setting PKCS7_SIGNER_INFO
2239 structures for PKCS7_sign(). They are now set up by the relevant public
2243 *) Add provisional EC pkey method with support for ECDSA and ECDH.
2246 *) Add support for key derivation (agreement) in the API, DH method and
2250 *) Add DSA pkey method and DH pkey methods, extend DH ASN1 method to support
2251 public and private key formats. As a side effect these add additional
2252 command line functionality not previously available: DSA signatures can be
2253 generated and verified using pkeyutl and DH key support and generation in
2258 [Oliver Tappe <zooey@hirschkaefer.de>]
2260 *) New make target "install_html_docs" installs HTML renditions of the
2262 [Oliver Tappe <zooey@hirschkaefer.de>]
2264 *) New utility "genpkey" this is analogous to "genrsa" etc except it can
2265 generate keys for any algorithm. Extend and update EVP_PKEY_METHOD to
2266 support key and parameter generation and add initial key generation
2267 functionality for RSA.
2270 *) Add functions for main EVP_PKEY_method operations. The undocumented
2271 functions EVP_PKEY_{encrypt,decrypt} have been renamed to
2272 EVP_PKEY_{encrypt,decrypt}_old.
2275 *) Initial definitions for EVP_PKEY_METHOD. This will be a high level public
2276 key API, doesn't do much yet.
2279 *) New function EVP_PKEY_asn1_get0_info() to retrieve information about
2280 public key algorithms. New option to openssl utility:
2281 "list-public-key-algorithms" to print out info.
2284 *) Implement the Supported Elliptic Curves Extension for
2285 ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
2288 *) Don't free up OIDs in OBJ_cleanup() if they are in use by EVP_MD or
2289 EVP_CIPHER structures to avoid later problems in EVP_cleanup().
2292 *) New utilities pkey and pkeyparam. These are similar to algorithm specific
2293 utilities such as rsa, dsa, dsaparam etc except they process any key
2297 *) Transfer public key printing routines to EVP_PKEY_ASN1_METHOD. New
2298 functions EVP_PKEY_print_public(), EVP_PKEY_print_private(),
2299 EVP_PKEY_print_param() to print public key data from an EVP_PKEY
2303 *) Initial support for pluggable public key ASN1.
2304 De-spaghettify the public key ASN1 handling. Move public and private
2305 key ASN1 handling to a new EVP_PKEY_ASN1_METHOD structure. Relocate
2306 algorithm specific handling to a single module within the relevant
2307 algorithm directory. Add functions to allow (near) opaque processing
2308 of public and private key structures.
2311 *) Implement the Supported Point Formats Extension for
2312 ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
2315 *) Add initial support for RFC 4279 PSK TLS ciphersuites. Add members
2316 for the psk identity [hint] and the psk callback functions to the
2317 SSL_SESSION, SSL and SSL_CTX structure.
2320 PSK-RC4-SHA, PSK-3DES-EDE-CBC-SHA, PSK-AES128-CBC-SHA,
2324 SSL_CTX_use_psk_identity_hint
2325 SSL_get_psk_identity_hint
2326 SSL_get_psk_identity
2327 SSL_use_psk_identity_hint
2329 [Mika Kousa and Pasi Eronen of Nokia Corporation]
2331 *) Add RFC 3161 compliant time stamp request creation, response generation
2332 and response verification functionality.
2333 [Zoltán Glózik <zglozik@opentsa.org>, The OpenTSA Project]
2335 *) Add initial support for TLS extensions, specifically for the server_name
2336 extension so far. The SSL_SESSION, SSL_CTX, and SSL data structures now
2337 have new members for a host name. The SSL data structure has an
2338 additional member SSL_CTX *initial_ctx so that new sessions can be
2339 stored in that context to allow for session resumption, even after the
2340 SSL has been switched to a new SSL_CTX in reaction to a client's
2341 server_name extension.
2343 New functions (subject to change):
2345 SSL_get_servername()
2346 SSL_get_servername_type()
2349 New CTRL codes and macros (subject to change):
2351 SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
2352 - SSL_CTX_set_tlsext_servername_callback()
2353 SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG
2354 - SSL_CTX_set_tlsext_servername_arg()
2355 SSL_CTRL_SET_TLSEXT_HOSTNAME - SSL_set_tlsext_host_name()
2357 openssl s_client has a new '-servername ...' option.
2359 openssl s_server has new options '-servername_host ...', '-cert2 ...',
2360 '-key2 ...', '-servername_fatal' (subject to change). This allows
2361 testing the HostName extension for a specific single host name ('-cert'
2362 and '-key' remain fallbacks for handshakes without HostName
2363 negotiation). If the unrecognized_name alert has to be sent, this by
2364 default is a warning; it becomes fatal with the '-servername_fatal'
2367 [Peter Sylvester, Remy Allais, Christophe Renou]
2369 *) Whirlpool hash implementation is added.
2372 *) BIGNUM code on 64-bit SPARCv9 targets is switched from bn(64,64) to
2373 bn(64,32). Because of instruction set limitations it doesn't have
2374 any negative impact on performance. This was done mostly in order
2375 to make it possible to share assembler modules, such as bn_mul_mont
2376 implementations, between 32- and 64-bit builds without hassle.
2379 *) Move code previously exiled into file crypto/ec/ec2_smpt.c
2380 to ec2_smpl.c, and no longer require the OPENSSL_EC_BIN_PT_COMP
2384 *) New candidate for BIGNUM assembler implementation, bn_mul_mont,
2385 dedicated Montgomery multiplication procedure, is introduced.
2386 BN_MONT_CTX is modified to allow bn_mul_mont to reach for higher
2387 "64-bit" performance on certain 32-bit targets.
2390 *) New option SSL_OP_NO_COMP to disable use of compression selectively
2391 in SSL structures. New SSL ctrl to set maximum send fragment size.
2392 Save memory by seeting the I/O buffer sizes dynamically instead of
2393 using the maximum available value.
2396 *) New option -V for 'openssl ciphers'. This prints the ciphersuite code
2397 in addition to the text details.
2400 *) Very, very preliminary EXPERIMENTAL support for printing of general
2401 ASN1 structures. This currently produces rather ugly output and doesn't
2402 handle several customised structures at all.
2405 *) Integrated support for PVK file format and some related formats such
2406 as MS PUBLICKEYBLOB and PRIVATEKEYBLOB. Command line switches to support
2407 these in the 'rsa' and 'dsa' utilities.
2410 *) Support for PKCS#1 RSAPublicKey format on rsa utility command line.
2413 *) Remove the ancient ASN1_METHOD code. This was only ever used in one
2414 place for the (very old) "NETSCAPE" format certificates which are now
2415 handled using new ASN1 code equivalents.
2418 *) Let the TLSv1_method() etc. functions return a 'const' SSL_METHOD
2419 pointer and make the SSL_METHOD parameter in SSL_CTX_new,
2420 SSL_CTX_set_ssl_version and SSL_set_ssl_method 'const'.
2423 *) Modify CRL distribution points extension code to print out previously
2424 unsupported fields. Enhance extension setting code to allow setting of
2428 *) Add print and set support for Issuing Distribution Point CRL extension.
2431 *) Change 'Configure' script to enable Camellia by default.
2434 Changes between 0.9.8x and 0.9.8y [5 Feb 2013]
2436 *) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.
2438 This addresses the flaw in CBC record processing discovered by
2439 Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
2440 at: http://www.isg.rhul.ac.uk/tls/
2442 Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
2443 Security Group at Royal Holloway, University of London
2444 (www.isg.rhul.ac.uk) for discovering this flaw and Adam Langley and
2445 Emilia Käsper for the initial patch.
2447 [Emilia Käsper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]
2449 *) Return an error when checking OCSP signatures when key is NULL.
2450 This fixes a DoS attack. (CVE-2013-0166)
2453 *) Call OCSP Stapling callback after ciphersuite has been chosen, so
2454 the right response is stapled. Also change SSL_get_certificate()
2455 so it returns the certificate actually sent.
2456 See http://rt.openssl.org/Ticket/Display.html?id=2836.
2457 (This is a backport)
2458 [Rob Stradling <rob.stradling@comodo.com>]
2460 *) Fix possible deadlock when decoding public keys.
2463 Changes between 0.9.8w and 0.9.8x [10 May 2012]
2465 *) Sanity check record length before skipping explicit IV in DTLS
2468 Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
2469 fuzzing as a service testing platform.
2473 *) Initialise tkeylen properly when encrypting CMS messages.
2474 Thanks to Solar Designer of Openwall for reporting this issue.
2477 Changes between 0.9.8v and 0.9.8w [23 Apr 2012]
2479 *) The fix for CVE-2012-2110 did not take into account that the
2480 'len' argument to BUF_MEM_grow and BUF_MEM_grow_clean is an
2481 int in OpenSSL 0.9.8, making it still vulnerable. Fix by
2482 rejecting negative len parameter. (CVE-2012-2131)
2483 [Tomas Hoger <thoger@redhat.com>]
2485 Changes between 0.9.8u and 0.9.8v [19 Apr 2012]
2487 *) Check for potentially exploitable overflows in asn1_d2i_read_bio
2488 BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
2489 in CRYPTO_realloc_clean.
2491 Thanks to Tavis Ormandy, Google Security Team, for discovering this
2492 issue and to Adam Langley <agl@chromium.org> for fixing it.
2494 [Adam Langley (Google), Tavis Ormandy, Google Security Team]
2496 Changes between 0.9.8t and 0.9.8u [12 Mar 2012]
2498 *) Fix MMA (Bleichenbacher's attack on PKCS #1 v1.5 RSA padding) weakness
2499 in CMS and PKCS7 code. When RSA decryption fails use a random key for
2500 content decryption and always return the same error. Note: this attack
2501 needs on average 2^20 messages so it only affects automated senders. The
2502 old behaviour can be reenabled in the CMS code by setting the
2503 CMS_DEBUG_DECRYPT flag: this is useful for debugging and testing where
2504 an MMA defence is not necessary.
2505 Thanks to Ivan Nestlerode <inestlerode@us.ibm.com> for discovering
2506 this issue. (CVE-2012-0884)
2509 *) Fix CVE-2011-4619: make sure we really are receiving a
2510 client hello before rejecting multiple SGC restarts. Thanks to
2511 Ivan Nestlerode <inestlerode@us.ibm.com> for discovering this bug.
2514 Changes between 0.9.8s and 0.9.8t [18 Jan 2012]
2516 *) Fix for DTLS DoS issue introduced by fix for CVE-2011-4109.
2517 Thanks to Antonio Martin, Enterprise Secure Access Research and
2518 Development, Cisco Systems, Inc. for discovering this bug and
2519 preparing a fix. (CVE-2012-0050)
2522 Changes between 0.9.8r and 0.9.8s [4 Jan 2012]
2524 *) Nadhem Alfardan and Kenny Paterson have discovered an extension
2525 of the Vaudenay padding oracle attack on CBC mode encryption
2526 which enables an efficient plaintext recovery attack against
2527 the OpenSSL implementation of DTLS. Their attack exploits timing
2528 differences arising during decryption processing. A research
2529 paper describing this attack can be found at:
2530 http://www.isg.rhul.ac.uk/~kp/dtls.pdf
2531 Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
2532 Security Group at Royal Holloway, University of London
2533 (www.isg.rhul.ac.uk) for discovering this flaw and to Robin Seggelmann
2534 <seggelmann@fh-muenster.de> and Michael Tuexen <tuexen@fh-muenster.de>
2535 for preparing the fix. (CVE-2011-4108)
2536 [Robin Seggelmann, Michael Tuexen]
2538 *) Stop policy check failure freeing same buffer twice. (CVE-2011-4109)
2539 [Ben Laurie, Kasper <ekasper@google.com>]
2541 *) Clear bytes used for block padding of SSL 3.0 records.
2543 [Adam Langley (Google)]
2545 *) Only allow one SGC handshake restart for SSL/TLS. Thanks to George
2546 Kadianakis <desnacked@gmail.com> for discovering this issue and
2547 Adam Langley for preparing the fix. (CVE-2011-4619)
2548 [Adam Langley (Google)]
2550 *) Prevent malformed RFC3779 data triggering an assertion failure.
2551 Thanks to Andrew Chi, BBN Technologies, for discovering the flaw
2552 and Rob Austein <sra@hactrn.net> for fixing it. (CVE-2011-4577)
2553 [Rob Austein <sra@hactrn.net>]
2555 *) Fix ssl_ciph.c set-up race.
2556 [Adam Langley (Google)]
2558 *) Fix spurious failures in ecdsatest.c.
2559 [Emilia Käsper (Google)]
2561 *) Fix the BIO_f_buffer() implementation (which was mixing different
2562 interpretations of the '..._len' fields).
2563 [Adam Langley (Google)]
2565 *) Fix handling of BN_BLINDING: now BN_BLINDING_invert_ex (rather than
2566 BN_BLINDING_invert_ex) calls BN_BLINDING_update, ensuring that concurrent
2567 threads won't reuse the same blinding coefficients.
2569 This also avoids the need to obtain the CRYPTO_LOCK_RSA_BLINDING
2570 lock to call BN_BLINDING_invert_ex, and avoids one use of
2571 BN_BLINDING_update for each BN_BLINDING structure (previously,
2572 the last update always remained unused).
2573 [Emilia Käsper (Google)]
2575 *) Fix SSL memory handling for (EC)DH ciphersuites, in particular
2576 for multi-threaded use of ECDH.
2577 [Adam Langley (Google)]
2579 *) Fix x509_name_ex_d2i memory leak on bad inputs.
2582 *) Add protection against ECDSA timing attacks as mentioned in the paper
2583 by Billy Bob Brumley and Nicola Tuveri, see:
2585 http://eprint.iacr.org/2011/232.pdf
2587 [Billy Bob Brumley and Nicola Tuveri]
2589 Changes between 0.9.8q and 0.9.8r [8 Feb 2011]
2591 *) Fix parsing of OCSP stapling ClientHello extension. CVE-2011-0014
2592 [Neel Mehta, Adam Langley, Bodo Moeller (Google)]
2594 *) Fix bug in string printing code: if *any* escaping is enabled we must
2595 escape the escape character (backslash) or the resulting string is
2599 Changes between 0.9.8p and 0.9.8q [2 Dec 2010]
2601 *) Disable code workaround for ancient and obsolete Netscape browsers
2602 and servers: an attacker can use it in a ciphersuite downgrade attack.
2603 Thanks to Martin Rex for discovering this bug. CVE-2010-4180
2606 *) Fixed J-PAKE implementation error, originally discovered by
2607 Sebastien Martini, further info and confirmation from Stefan
2608 Arentz and Feng Hao. Note that this fix is a security fix. CVE-2010-4252
2611 Changes between 0.9.8o and 0.9.8p [16 Nov 2010]
2613 *) Fix extension code to avoid race conditions which can result in a buffer
2614 overrun vulnerability: resumed sessions must not be modified as they can
2615 be shared by multiple threads. CVE-2010-3864
2618 *) Fix for double free bug in ssl/s3_clnt.c CVE-2010-2939
2621 *) Don't reencode certificate when calculating signature: cache and use
2622 the original encoding instead. This makes signature verification of
2623 some broken encodings work correctly.
2626 *) ec2_GF2m_simple_mul bugfix: compute correct result if the output EC_POINT
2627 is also one of the inputs.
2628 [Emilia Käsper <emilia.kasper@esat.kuleuven.be> (Google)]
2630 *) Don't repeatedly append PBE algorithms to table if they already exist.
2631 Sort table on each new add. This effectively makes the table read only
2632 after all algorithms are added and subsequent calls to PKCS12_pbe_add
2636 Changes between 0.9.8n and 0.9.8o [01 Jun 2010]
2638 [NB: OpenSSL 0.9.8o and later 0.9.8 patch levels were released after
2641 *) Correct a typo in the CMS ASN1 module which can result in invalid memory
2642 access or freeing data twice (CVE-2010-0742)
2643 [Steve Henson, Ronald Moesbergen <intercommit@gmail.com>]
2645 *) Add SHA2 algorithms to SSL_library_init(). SHA2 is becoming far more
2646 common in certificates and some applications which only call
2647 SSL_library_init and not OpenSSL_add_all_algorithms() will fail.
2651 Reduce copying into .apps and .test in makevms.com
2652 Don't try to use blank CA certificate in CA.com
2653 Allow use of C files from original directories in maketests.com
2654 [Steven M. Schweda" <sms@antinode.info>]
2656 Changes between 0.9.8m and 0.9.8n [24 Mar 2010]
2658 *) When rejecting SSL/TLS records due to an incorrect version number, never
2659 update s->server with a new major version number. As of
2660 - OpenSSL 0.9.8m if 'short' is a 16-bit type,
2661 - OpenSSL 0.9.8f if 'short' is longer than 16 bits,
2662 the previous behavior could result in a read attempt at NULL when
2663 receiving specific incorrect SSL/TLS records once record payload
2664 protection is active. (CVE-2010-0740)
2665 [Bodo Moeller, Adam Langley <agl@chromium.org>]
2667 *) Fix for CVE-2010-0433 where some kerberos enabled versions of OpenSSL
2668 could be crashed if the relevant tables were not present (e.g. chrooted).
2669 [Tomas Hoger <thoger@redhat.com>]
2671 Changes between 0.9.8l and 0.9.8m [25 Feb 2010]
2673 *) Always check bn_wexpend() return values for failure. (CVE-2009-3245)
2674 [Martin Olsson, Neel Mehta]
2676 *) Fix X509_STORE locking: Every 'objs' access requires a lock (to
2677 accommodate for stack sorting, always a write lock!).
2680 *) On some versions of WIN32 Heap32Next is very slow. This can cause
2681 excessive delays in the RAND_poll(): over a minute. As a workaround
2682 include a time check in the inner Heap32Next loop too.
2685 *) The code that handled flushing of data in SSL/TLS originally used the
2686 BIO_CTRL_INFO ctrl to see if any data was pending first. This caused
2687 the problem outlined in PR#1949. The fix suggested there however can
2688 trigger problems with buggy BIO_CTRL_WPENDING (e.g. some versions
2689 of Apache). So instead simplify the code to flush unconditionally.
2690 This should be fine since flushing with no data to flush is a no op.
2693 *) Handle TLS versions 2.0 and later properly and correctly use the
2694 highest version of TLS/SSL supported. Although TLS >= 2.0 is some way
2695 off ancient servers have a habit of sticking around for a while...
2698 *) Modify compression code so it frees up structures without using the
2699 ex_data callbacks. This works around a problem where some applications
2700 call CRYPTO_cleanup_all_ex_data() before application exit (e.g. when
2701 restarting) then use compression (e.g. SSL with compression) later.
2702 This results in significant per-connection memory leaks and
2703 has caused some security issues including CVE-2008-1678 and
2707 *) Constify crypto/cast (i.e., <openssl/cast.h>): a CAST_KEY doesn't
2708 change when encrypting or decrypting.
2711 *) Add option SSL_OP_LEGACY_SERVER_CONNECT which will allow clients to
2712 connect and renegotiate with servers which do not support RI.
2713 Until RI is more widely deployed this option is enabled by default.
2716 *) Add "missing" ssl ctrls to clear options and mode.
2719 *) If client attempts to renegotiate and doesn't support RI respond with
2720 a no_renegotiation alert as required by RFC5746. Some renegotiating
2721 TLS clients will continue a connection gracefully when they receive
2722 the alert. Unfortunately OpenSSL mishandled this alert and would hang
2723 waiting for a server hello which it will never receive. Now we treat a
2724 received no_renegotiation alert as a fatal error. This is because
2725 applications requesting a renegotiation might well expect it to succeed
2726 and would have no code in place to handle the server denying it so the
2727 only safe thing to do is to terminate the connection.
2730 *) Add ctrl macro SSL_get_secure_renegotiation_support() which returns 1 if
2731 peer supports secure renegotiation and 0 otherwise. Print out peer
2732 renegotiation support in s_client/s_server.
2735 *) Replace the highly broken and deprecated SPKAC certification method with
2736 the updated NID creation version. This should correctly handle UTF8.
2739 *) Implement RFC5746. Re-enable renegotiation but require the extension
2740 as needed. Unfortunately, SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
2741 turns out to be a bad idea. It has been replaced by
2742 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION which can be set with
2743 SSL_CTX_set_options(). This is really not recommended unless you
2744 know what you are doing.
2745 [Eric Rescorla <ekr@networkresonance.com>, Ben Laurie, Steve Henson]
2747 *) Fixes to stateless session resumption handling. Use initial_ctx when
2748 issuing and attempting to decrypt tickets in case it has changed during
2749 servername handling. Use a non-zero length session ID when attempting
2750 stateless session resumption: this makes it possible to determine if
2751 a resumption has occurred immediately after receiving server hello
2752 (several places in OpenSSL subtly assume this) instead of later in
2756 *) The functions ENGINE_ctrl(), OPENSSL_isservice(),
2757 CMS_get1_RecipientRequest() and RAND_bytes() can return <=0 on error
2758 fixes for a few places where the return code is not checked
2760 [Julia Lawall <julia@diku.dk>]
2762 *) Add --strict-warnings option to Configure script to include devteam
2763 warnings in other configurations.
2766 *) Add support for --libdir option and LIBDIR variable in makefiles. This
2767 makes it possible to install openssl libraries in locations which
2768 have names other than "lib", for example "/usr/lib64" which some
2770 [Steve Henson, based on patch from Jeremy Utley]
2772 *) Don't allow the use of leading 0x80 in OIDs. This is a violation of
2773 X690 8.9.12 and can produce some misleading textual output of OIDs.
2774 [Steve Henson, reported by Dan Kaminsky]
2776 *) Delete MD2 from algorithm tables. This follows the recommendation in
2777 several standards that it is not used in new applications due to
2778 several cryptographic weaknesses. For binary compatibility reasons
2779 the MD2 API is still compiled in by default.
2782 *) Add compression id to {d2i,i2d}_SSL_SESSION so it is correctly saved
2786 *) Rename uni2asc and asc2uni functions to OPENSSL_uni2asc and
2787 OPENSSL_asc2uni conditionally on Netware platforms to avoid a name
2789 [Guenter <lists@gknw.net>]
2791 *) Fix the server certificate chain building code to use X509_verify_cert(),
2792 it used to have an ad-hoc builder which was unable to cope with anything
2793 other than a simple chain.
2794 [David Woodhouse <dwmw2@infradead.org>, Steve Henson]
2796 *) Don't check self signed certificate signatures in X509_verify_cert()
2797 by default (a flag can override this): it just wastes time without
2798 adding any security. As a useful side effect self signed root CAs
2799 with non-FIPS digests are now usable in FIPS mode.
2802 *) In dtls1_process_out_of_seq_message() the check if the current message
2803 is already buffered was missing. For every new message was memory
2804 allocated, allowing an attacker to perform an denial of service attack
2805 with sending out of seq handshake messages until there is no memory
2806 left. Additionally every future messege was buffered, even if the
2807 sequence number made no sense and would be part of another handshake.
2808 So only messages with sequence numbers less than 10 in advance will be
2809 buffered. (CVE-2009-1378)
2810 [Robin Seggelmann, discovered by Daniel Mentz]
2812 *) Records are buffered if they arrive with a future epoch to be
2813 processed after finishing the corresponding handshake. There is
2814 currently no limitation to this buffer allowing an attacker to perform
2815 a DOS attack with sending records with future epochs until there is no
2816 memory left. This patch adds the pqueue_size() function to determine
2817 the size of a buffer and limits the record buffer to 100 entries.
2819 [Robin Seggelmann, discovered by Daniel Mentz]
2821 *) Keep a copy of frag->msg_header.frag_len so it can be used after the
2822 parent structure is freed. (CVE-2009-1379)
2825 *) Handle non-blocking I/O properly in SSL_shutdown() call.
2826 [Darryl Miles <darryl-mailinglists@netbauds.net>]
2829 [Ilya O. <vrghost@gmail.com>]
2831 Changes between 0.9.8k and 0.9.8l [5 Nov 2009]
2833 *) Disable renegotiation completely - this fixes a severe security
2834 problem (CVE-2009-3555) at the cost of breaking all
2835 renegotiation. Renegotiation can be re-enabled by setting
2836 SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION in s3->flags at
2837 run-time. This is really not recommended unless you know what
2841 Changes between 0.9.8j and 0.9.8k [25 Mar 2009]
2843 *) Don't set val to NULL when freeing up structures, it is freed up by
2844 underlying code. If sizeof(void *) > sizeof(long) this can result in
2845 zeroing past the valid field. (CVE-2009-0789)
2846 [Paolo Ganci <Paolo.Ganci@AdNovum.CH>]
2848 *) Fix bug where return value of CMS_SignerInfo_verify_content() was not
2849 checked correctly. This would allow some invalid signed attributes to
2850 appear to verify correctly. (CVE-2009-0591)
2851 [Ivan Nestlerode <inestlerode@us.ibm.com>]
2853 *) Reject UniversalString and BMPString types with invalid lengths. This
2854 prevents a crash in ASN1_STRING_print_ex() which assumes the strings have
2855 a legal length. (CVE-2009-0590)
2858 *) Set S/MIME signing as the default purpose rather than setting it
2859 unconditionally. This allows applications to override it at the store
2863 *) Permit restricted recursion of ASN1 strings. This is needed in practice
2864 to handle some structures.
2867 *) Improve efficiency of mem_gets: don't search whole buffer each time
2869 [Jeremy Shapiro <jnshapir@us.ibm.com>]
2871 *) New -hex option for openssl rand.
2874 *) Print out UTF8String and NumericString when parsing ASN1.
2877 *) Support NumericString type for name components.
2880 *) Allow CC in the environment to override the automatically chosen
2881 compiler. Note that nothing is done to ensure flags work with the
2885 Changes between 0.9.8i and 0.9.8j [07 Jan 2009]
2887 *) Properly check EVP_VerifyFinal() and similar return values
2889 [Ben Laurie, Bodo Moeller, Google Security Team]
2891 *) Enable TLS extensions by default.
2894 *) Allow the CHIL engine to be loaded, whether the application is
2895 multithreaded or not. (This does not release the developer from the
2896 obligation to set up the dynamic locking callbacks.)
2897 [Sander Temme <sander@temme.net>]
2899 *) Use correct exit code if there is an error in dgst command.
2900 [Steve Henson; problem pointed out by Roland Dirlewanger]
2902 *) Tweak Configure so that you need to say "experimental-jpake" to enable
2903 JPAKE, and need to use -DOPENSSL_EXPERIMENTAL_JPAKE in applications.
2906 *) Add experimental JPAKE support, including demo authentication in
2907 s_client and s_server.
2910 *) Set the comparison function in v3_addr_canonize().
2911 [Rob Austein <sra@hactrn.net>]
2913 *) Add support for XMPP STARTTLS in s_client.
2914 [Philip Paeps <philip@freebsd.org>]
2916 *) Change the server-side SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG behavior
2917 to ensure that even with this option, only ciphersuites in the
2918 server's preference list will be accepted. (Note that the option
2919 applies only when resuming a session, so the earlier behavior was
2920 just about the algorithm choice for symmetric cryptography.)
2923 Changes between 0.9.8h and 0.9.8i [15 Sep 2008]
2925 *) Fix NULL pointer dereference if a DTLS server received
2926 ChangeCipherSpec as first record (CVE-2009-1386).
2929 *) Fix a state transition in s3_srvr.c and d1_srvr.c
2930 (was using SSL3_ST_CW_CLNT_HELLO_B, should be ..._ST_SW_SRVR_...).
2933 *) The fix in 0.9.8c that supposedly got rid of unsafe
2934 double-checked locking was incomplete for RSA blinding,
2935 addressing just one layer of what turns out to have been
2936 doubly unsafe triple-checked locking.
2938 So now fix this for real by retiring the MONT_HELPER macro
2939 in crypto/rsa/rsa_eay.c.
2941 [Bodo Moeller; problem pointed out by Marius Schilder]
2943 *) Various precautionary measures:
2945 - Avoid size_t integer overflow in HASH_UPDATE (md32_common.h).
2947 - Avoid a buffer overflow in d2i_SSL_SESSION() (ssl_asn1.c).
2948 (NB: This would require knowledge of the secret session ticket key
2949 to exploit, in which case you'd be SOL either way.)
2951 - Change bn_nist.c so that it will properly handle input BIGNUMs
2952 outside the expected range.
2954 - Enforce the 'num' check in BN_div() (bn_div.c) for non-BN_DEBUG
2957 [Neel Mehta, Bodo Moeller]
2959 *) Allow engines to be "soft loaded" - i.e. optionally don't die if
2960 the load fails. Useful for distros.
2961 [Ben Laurie and the FreeBSD team]
2963 *) Add support for Local Machine Keyset attribute in PKCS#12 files.
2966 *) Fix BN_GF2m_mod_arr() top-bit cleanup code.
2969 *) Expand ENGINE to support engine supplied SSL client certificate functions.
2971 This work was sponsored by Logica.
2974 *) Add CryptoAPI ENGINE to support use of RSA and DSA keys held in Windows
2975 keystores. Support for SSL/TLS client authentication too.
2976 Not compiled unless enable-capieng specified to Configure.
2978 This work was sponsored by Logica.
2981 *) Fix bug in X509_ATTRIBUTE creation: dont set attribute using
2982 ASN1_TYPE_set1 if MBSTRING flag set. This bug would crash certain
2983 attribute creation routines such as certifcate requests and PKCS#12
2987 Changes between 0.9.8g and 0.9.8h [28 May 2008]
2989 *) Fix flaw if 'Server Key exchange message' is omitted from a TLS
2990 handshake which could lead to a cilent crash as found using the
2991 Codenomicon TLS test suite (CVE-2008-1672)
2992 [Steve Henson, Mark Cox]
2994 *) Fix double free in TLS server name extensions which could lead to
2995 a remote crash found by Codenomicon TLS test suite (CVE-2008-0891)
2998 *) Clear error queue in SSL_CTX_use_certificate_chain_file()
3000 Clear the error queue to ensure that error entries left from
3001 older function calls do not interfere with the correct operation.
3002 [Lutz Jaenicke, Erik de Castro Lopo]
3004 *) Remove root CA certificates of commercial CAs:
3006 The OpenSSL project does not recommend any specific CA and does not
3007 have any policy with respect to including or excluding any CA.
3008 Therefore it does not make any sense to ship an arbitrary selection
3009 of root CA certificates with the OpenSSL software.
3012 *) RSA OAEP patches to fix two separate invalid memory reads.
3013 The first one involves inputs when 'lzero' is greater than
3014 'SHA_DIGEST_LENGTH' (it would read about SHA_DIGEST_LENGTH bytes
3015 before the beginning of from). The second one involves inputs where
3016 the 'db' section contains nothing but zeroes (there is a one-byte
3017 invalid read after the end of 'db').
3018 [Ivan Nestlerode <inestlerode@us.ibm.com>]
3020 *) Partial backport from 0.9.9-dev:
3022 Introduce bn_mul_mont (dedicated Montgomery multiplication
3023 procedure) as a candidate for BIGNUM assembler implementation.
3024 While 0.9.9-dev uses assembler for various architectures, only
3025 x86_64 is available by default here in the 0.9.8 branch, and
3026 32-bit x86 is available through a compile-time setting.
3028 To try the 32-bit x86 assembler implementation, use Configure
3029 option "enable-montasm" (which exists only for this backport).
3031 As "enable-montasm" for 32-bit x86 disclaims code stability
3032 anyway, in this constellation we activate additional code
3033 backported from 0.9.9-dev for further performance improvements,
3034 namely BN_from_montgomery_word. (To enable this otherwise,
3035 e.g. x86_64, try "-DMONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD".)
3037 [Andy Polyakov (backport partially by Bodo Moeller)]
3039 *) Add TLS session ticket callback. This allows an application to set
3040 TLS ticket cipher and HMAC keys rather than relying on hardcoded fixed
3041 values. This is useful for key rollover for example where several key
3042 sets may exist with different names.
3045 *) Reverse ENGINE-internal logic for caching default ENGINE handles.
3046 This was broken until now in 0.9.8 releases, such that the only way
3047 a registered ENGINE could be used (assuming it initialises
3048 successfully on the host) was to explicitly set it as the default
3049 for the relevant algorithms. This is in contradiction with 0.9.7
3050 behaviour and the documentation. With this fix, when an ENGINE is
3051 registered into a given algorithm's table of implementations, the
3052 'uptodate' flag is reset so that auto-discovery will be used next
3053 time a new context for that algorithm attempts to select an
3055 [Ian Lister (tweaked by Geoff Thorpe)]
3057 *) Backport of CMS code to OpenSSL 0.9.8. This differs from the 0.9.9
3058 implemention in the following ways:
3060 Lack of EVP_PKEY_ASN1_METHOD means algorithm parameters have to be
3063 Lack of BER streaming support means one pass streaming processing is
3064 only supported if data is detached: setting the streaming flag is
3065 ignored for embedded content.
3067 CMS support is disabled by default and must be explicitly enabled
3068 with the enable-cms configuration option.
3071 *) Update the GMP engine glue to do direct copies between BIGNUM and
3072 mpz_t when openssl and GMP use the same limb size. Otherwise the
3073 existing "conversion via a text string export" trick is still used.
3074 [Paul Sheer <paulsheer@gmail.com>]
3076 *) Zlib compression BIO. This is a filter BIO which compressed and
3077 uncompresses any data passed through it.
3080 *) Add AES_wrap_key() and AES_unwrap_key() functions to implement
3081 RFC3394 compatible AES key wrapping.
3084 *) Add utility functions to handle ASN1 structures. ASN1_STRING_set0():
3085 sets string data without copying. X509_ALGOR_set0() and
3086 X509_ALGOR_get0(): set and retrieve X509_ALGOR (AlgorithmIdentifier)
3087 data. Attribute function X509at_get0_data_by_OBJ(): retrieves data
3088 from an X509_ATTRIBUTE structure optionally checking it occurs only
3089 once. ASN1_TYPE_set1(): set and ASN1_TYPE structure copying supplied
3093 *) Fix BN flag handling in RSA_eay_mod_exp() and BN_MONT_CTX_set()
3094 to get the expected BN_FLG_CONSTTIME behavior.
3095 [Bodo Moeller (Google)]
3099 - fixed wrong usage of ioctlsocket() when build for LIBC BSD sockets
3100 - fixed do_tests.pl to run the test suite with CLIB builds too (CLIB_OPT)
3101 - added some more tests to do_tests.pl
3102 - fixed RunningProcess usage so that it works with newer LIBC NDKs too
3103 - removed usage of BN_LLONG for CLIB builds to avoid runtime dependency
3104 - added new Configure targets netware-clib-bsdsock, netware-clib-gcc,
3105 netware-clib-bsdsock-gcc, netware-libc-bsdsock-gcc
3106 - various changes to netware.pl to enable gcc-cross builds on Win32
3108 - changed crypto/bio/b_sock.c to work with macro functions (CLIB BSD)
3109 - various changes to fix missing prototype warnings
3110 - fixed x86nasm.pl to create correct asm files for NASM COFF output
3111 - added AES, WHIRLPOOL and CPUID assembler code to build files
3112 - added missing AES assembler make rules to mk1mf.pl
3113 - fixed order of includes in apps/ocsp.c so that e_os.h settings apply
3114 [Guenter Knauf <eflash@gmx.net>]
3116 *) Implement certificate status request TLS extension defined in RFC3546.
3117 A client can set the appropriate parameters and receive the encoded
3118 OCSP response via a callback. A server can query the supplied parameters
3119 and set the encoded OCSP response in the callback. Add simplified examples
3120 to s_client and s_server.
3123 Changes between 0.9.8f and 0.9.8g [19 Oct 2007]
3125 *) Fix various bugs:
3126 + Binary incompatibility of ssl_ctx_st structure
3127 + DTLS interoperation with non-compliant servers
3128 + Don't call get_session_cb() without proposed session
3129 + Fix ia64 assembler code
3130 [Andy Polyakov, Steve Henson]
3132 Changes between 0.9.8e and 0.9.8f [11 Oct 2007]
3134 *) DTLS Handshake overhaul. There were longstanding issues with
3135 OpenSSL DTLS implementation, which were making it impossible for
3136 RFC 4347 compliant client to communicate with OpenSSL server.
3137 Unfortunately just fixing these incompatibilities would "cut off"
3138 pre-0.9.8f clients. To allow for hassle free upgrade post-0.9.8e
3139 server keeps tolerating non RFC compliant syntax. The opposite is
3140 not true, 0.9.8f client can not communicate with earlier server.
3141 This update even addresses CVE-2007-4995.
3144 *) Changes to avoid need for function casts in OpenSSL: some compilers
3145 (gcc 4.2 and later) reject their use.
3146 [Kurt Roeckx <kurt@roeckx.be>, Peter Hartley <pdh@utter.chaos.org.uk>,
3149 *) Add RFC4507 support to OpenSSL. This includes the corrections in
3150 RFC4507bis. The encrypted ticket format is an encrypted encoded
3151 SSL_SESSION structure, that way new session features are automatically
3154 If a client application caches session in an SSL_SESSION structure
3155 support is transparent because tickets are now stored in the encoded
3158 The SSL_CTX structure automatically generates keys for ticket
3159 protection in servers so again support should be possible
3160 with no application modification.
3162 If a client or server wishes to disable RFC4507 support then the option
3163 SSL_OP_NO_TICKET can be set.
3165 Add a TLS extension debugging callback to allow the contents of any client
3166 or server extensions to be examined.
3168 This work was sponsored by Google.
3171 *) Add initial support for TLS extensions, specifically for the server_name
3172 extension so far. The SSL_SESSION, SSL_CTX, and SSL data structures now
3173 have new members for a host name. The SSL data structure has an
3174 additional member SSL_CTX *initial_ctx so that new sessions can be
3175 stored in that context to allow for session resumption, even after the
3176 SSL has been switched to a new SSL_CTX in reaction to a client's
3177 server_name extension.
3179 New functions (subject to change):
3181 SSL_get_servername()
3182 SSL_get_servername_type()
3185 New CTRL codes and macros (subject to change):
3187 SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
3188 - SSL_CTX_set_tlsext_servername_callback()
3189 SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG
3190 - SSL_CTX_set_tlsext_servername_arg()
3191 SSL_CTRL_SET_TLSEXT_HOSTNAME - SSL_set_tlsext_host_name()
3193 openssl s_client has a new '-servername ...' option.
3195 openssl s_server has new options '-servername_host ...', '-cert2 ...',
3196 '-key2 ...', '-servername_fatal' (subject to change). This allows
3197 testing the HostName extension for a specific single host name ('-cert'
3198 and '-key' remain fallbacks for handshakes without HostName
3199 negotiation). If the unrecognized_name alert has to be sent, this by
3200 default is a warning; it becomes fatal with the '-servername_fatal'
3203 [Peter Sylvester, Remy Allais, Christophe Renou, Steve Henson]
3205 *) Add AES and SSE2 assembly language support to VC++ build.
3208 *) Mitigate attack on final subtraction in Montgomery reduction.
3211 *) Fix crypto/ec/ec_mult.c to work properly with scalars of value 0
3212 (which previously caused an internal error).
3215 *) Squeeze another 10% out of IGE mode when in != out.
3218 *) AES IGE mode speedup.
3219 [Dean Gaudet (Google)]
3221 *) Add the Korean symmetric 128-bit cipher SEED (see
3222 http://www.kisa.or.kr/kisa/seed/jsp/seed_eng.jsp) and
3223 add SEED ciphersuites from RFC 4162:
3225 TLS_RSA_WITH_SEED_CBC_SHA = "SEED-SHA"
3226 TLS_DHE_DSS_WITH_SEED_CBC_SHA = "DHE-DSS-SEED-SHA"
3227 TLS_DHE_RSA_WITH_SEED_CBC_SHA = "DHE-RSA-SEED-SHA"
3228 TLS_DH_anon_WITH_SEED_CBC_SHA = "ADH-SEED-SHA"
3230 To minimize changes between patchlevels in the OpenSSL 0.9.8
3231 series, SEED remains excluded from compilation unless OpenSSL
3232 is configured with 'enable-seed'.
3233 [KISA, Bodo Moeller]
3235 *) Mitigate branch prediction attacks, which can be practical if a
3236 single processor is shared, allowing a spy process to extract
3237 information. For detailed background information, see
3238 http://eprint.iacr.org/2007/039 (O. Aciicmez, S. Gueron,
3239 J.-P. Seifert, "New Branch Prediction Vulnerabilities in OpenSSL
3240 and Necessary Software Countermeasures"). The core of the change
3241 are new versions BN_div_no_branch() and
3242 BN_mod_inverse_no_branch() of BN_div() and BN_mod_inverse(),
3243 respectively, which are slower, but avoid the security-relevant
3244 conditional branches. These are automatically called by BN_div()
3245 and BN_mod_inverse() if the flag BN_FLG_CONSTTIME is set for one
3246 of the input BIGNUMs. Also, BN_is_bit_set() has been changed to
3247 remove a conditional branch.
3249 BN_FLG_CONSTTIME is the new name for the previous
3250 BN_FLG_EXP_CONSTTIME flag, since it now affects more than just
3251 modular exponentiation. (Since OpenSSL 0.9.7h, setting this flag
3252 in the exponent causes BN_mod_exp_mont() to use the alternative
3253 implementation in BN_mod_exp_mont_consttime().) The old name
3254 remains as a deprecated alias.
3256 Similary, RSA_FLAG_NO_EXP_CONSTTIME is replaced by a more general
3257 RSA_FLAG_NO_CONSTTIME flag since the RSA implementation now uses
3258 constant-time implementations for more than just exponentiation.
3259 Here too the old name is kept as a deprecated alias.
3261 BN_BLINDING_new() will now use BN_dup() for the modulus so that
3262 the BN_BLINDING structure gets an independent copy of the
3263 modulus. This means that the previous "BIGNUM *m" argument to
3264 BN_BLINDING_new() and to BN_BLINDING_create_param() now
3265 essentially becomes "const BIGNUM *m", although we can't actually
3266 change this in the header file before 0.9.9. It allows
3267 RSA_setup_blinding() to use BN_with_flags() on the modulus to
3268 enable BN_FLG_CONSTTIME.
3270 [Matthew D Wood (Intel Corp)]
3272 *) In the SSL/TLS server implementation, be strict about session ID
3273 context matching (which matters if an application uses a single
3274 external cache for different purposes). Previously,
3275 out-of-context reuse was forbidden only if SSL_VERIFY_PEER was
3276 set. This did ensure strict client verification, but meant that,
3277 with applications using a single external cache for quite
3278 different requirements, clients could circumvent ciphersuite
3279 restrictions for a given session ID context by starting a session
3280 in a different context.
3283 *) Include "!eNULL" in SSL_DEFAULT_CIPHER_LIST to make sure that
3284 a ciphersuite string such as "DEFAULT:RSA" cannot enable
3285 authentication-only ciphersuites.
3288 *) Update the SSL_get_shared_ciphers() fix CVE-2006-3738 which was
3289 not complete and could lead to a possible single byte overflow
3290 (CVE-2007-5135) [Ben Laurie]
3292 Changes between 0.9.8d and 0.9.8e [23 Feb 2007]
3294 *) Since AES128 and AES256 (and similarly Camellia128 and
3295 Camellia256) share a single mask bit in the logic of
3296 ssl/ssl_ciph.c, the code for masking out disabled ciphers needs a
3297 kludge to work properly if AES128 is available and AES256 isn't
3298 (or if Camellia128 is available and Camellia256 isn't).
3301 *) Fix the BIT STRING encoding generated by crypto/ec/ec_asn1.c
3302 (within i2d_ECPrivateKey, i2d_ECPKParameters, i2d_ECParameters):
3303 When a point or a seed is encoded in a BIT STRING, we need to
3304 prevent the removal of trailing zero bits to get the proper DER
3305 encoding. (By default, crypto/asn1/a_bitstr.c assumes the case
3306 of a NamedBitList, for which trailing 0 bits need to be removed.)
3309 *) Have SSL/TLS server implementation tolerate "mismatched" record
3310 protocol version while receiving ClientHello even if the
3311 ClientHello is fragmented. (The server can't insist on the
3312 particular protocol version it has chosen before the ServerHello
3313 message has informed the client about his choice.)
3316 *) Add RFC 3779 support.
3317 [Rob Austein for ARIN, Ben Laurie]
3319 *) Load error codes if they are not already present instead of using a
3320 static variable. This allows them to be cleanly unloaded and reloaded.
3321 Improve header file function name parsing.
3324 *) extend SMTP and IMAP protocol emulation in s_client to use EHLO
3325 or CAPABILITY handshake as required by RFCs.
3328 Changes between 0.9.8c and 0.9.8d [28 Sep 2006]
3330 *) Introduce limits to prevent malicious keys being able to
3331 cause a denial of service. (CVE-2006-2940)
3332 [Steve Henson, Bodo Moeller]
3334 *) Fix ASN.1 parsing of certain invalid structures that can result
3335 in a denial of service. (CVE-2006-2937) [Steve Henson]
3337 *) Fix buffer overflow in SSL_get_shared_ciphers() function.
3338 (CVE-2006-3738) [Tavis Ormandy and Will Drewry, Google Security Team]
3340 *) Fix SSL client code which could crash if connecting to a
3341 malicious SSLv2 server. (CVE-2006-4343)
3342 [Tavis Ormandy and Will Drewry, Google Security Team]
3344 *) Since 0.9.8b, ciphersuite strings naming explicit ciphersuites
3345 match only those. Before that, "AES256-SHA" would be interpreted
3346 as a pattern and match "AES128-SHA" too (since AES128-SHA got
3347 the same strength classification in 0.9.7h) as we currently only
3348 have a single AES bit in the ciphersuite description bitmap.
3349 That change, however, also applied to ciphersuite strings such as
3350 "RC4-MD5" that intentionally matched multiple ciphersuites --
3351 namely, SSL 2.0 ciphersuites in addition to the more common ones
3352 from SSL 3.0/TLS 1.0.
3354 So we change the selection algorithm again: Naming an explicit
3355 ciphersuite selects this one ciphersuite, and any other similar
3356 ciphersuite (same bitmap) from *other* protocol versions.
3357 Thus, "RC4-MD5" again will properly select both the SSL 2.0
3358 ciphersuite and the SSL 3.0/TLS 1.0 ciphersuite.
3360 Since SSL 2.0 does not have any ciphersuites for which the
3361 128/256 bit distinction would be relevant, this works for now.
3362 The proper fix will be to use different bits for AES128 and
3363 AES256, which would have avoided the problems from the beginning;
3364 however, bits are scarce, so we can only do this in a new release
3365 (not just a patchlevel) when we can change the SSL_CIPHER
3366 definition to split the single 'unsigned long mask' bitmap into
3367 multiple values to extend the available space.
3371 Changes between 0.9.8b and 0.9.8c [05 Sep 2006]
3373 *) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
3374 (CVE-2006-4339) [Ben Laurie and Google Security Team]
3376 *) Add AES IGE and biIGE modes.
3379 *) Change the Unix randomness entropy gathering to use poll() when
3380 possible instead of select(), since the latter has some
3381 undesirable limitations.
3382 [Darryl Miles via Richard Levitte and Bodo Moeller]
3384 *) Disable "ECCdraft" ciphersuites more thoroughly. Now special
3385 treatment in ssl/ssl_ciph.s makes sure that these ciphersuites
3386 cannot be implicitly activated as part of, e.g., the "AES" alias.
3387 However, please upgrade to OpenSSL 0.9.9[-dev] for
3388 non-experimental use of the ECC ciphersuites to get TLS extension
3389 support, which is required for curve and point format negotiation
3390 to avoid potential handshake problems.
3393 *) Disable rogue ciphersuites:
3395 - SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")
3396 - SSLv3/TLSv1 0x00 0x61 ("EXP1024-RC2-CBC-MD5")
3397 - SSLv3/TLSv1 0x00 0x60 ("EXP1024-RC4-MD5")
3399 The latter two were purportedly from
3400 draft-ietf-tls-56-bit-ciphersuites-0[01].txt, but do not really
3403 Also deactivate the remaining ciphersuites from
3404 draft-ietf-tls-56-bit-ciphersuites-01.txt. These are just as
3405 unofficial, and the ID has long expired.
3408 *) Fix RSA blinding Heisenbug (problems sometimes occured on
3409 dual-core machines) and other potential thread-safety issues.
3412 *) Add the symmetric cipher Camellia (128-bit, 192-bit, 256-bit key
3413 versions), which is now available for royalty-free use
3414 (see http://info.isl.ntt.co.jp/crypt/eng/info/chiteki.html).
3415 Also, add Camellia TLS ciphersuites from RFC 4132.
3417 To minimize changes between patchlevels in the OpenSSL 0.9.8
3418 series, Camellia remains excluded from compilation unless OpenSSL
3419 is configured with 'enable-camellia'.
3422 *) Disable the padding bug check when compression is in use. The padding
3423 bug check assumes the first packet is of even length, this is not
3424 necessarily true if compresssion is enabled and can result in false
3425 positives causing handshake failure. The actual bug test is ancient
3426 code so it is hoped that implementations will either have fixed it by
3427 now or any which still have the bug do not support compression.
3430 Changes between 0.9.8a and 0.9.8b [04 May 2006]
3432 *) When applying a cipher rule check to see if string match is an explicit
3433 cipher suite and only match that one cipher suite if it is.
3436 *) Link in manifests for VC++ if needed.
3437 [Austin Ziegler <halostatue@gmail.com>]
3439 *) Update support for ECC-based TLS ciphersuites according to
3440 draft-ietf-tls-ecc-12.txt with proposed changes (but without
3441 TLS extensions, which are supported starting with the 0.9.9
3442 branch, not in the OpenSSL 0.9.8 branch).
3445 *) New functions EVP_CIPHER_CTX_new() and EVP_CIPHER_CTX_free() to support
3446 opaque EVP_CIPHER_CTX handling.
3449 *) Fixes and enhancements to zlib compression code. We now only use
3450 "zlib1.dll" and use the default __cdecl calling convention on Win32
3451 to conform with the standards mentioned here:
3452 http://www.zlib.net/DLL_FAQ.txt
3453 Static zlib linking now works on Windows and the new --with-zlib-include
3454 --with-zlib-lib options to Configure can be used to supply the location
3455 of the headers and library. Gracefully handle case where zlib library
3459 *) Several fixes and enhancements to the OID generation code. The old code
3460 sometimes allowed invalid OIDs (1.X for X >= 40 for example), couldn't
3461 handle numbers larger than ULONG_MAX, truncated printing and had a
3462 non standard OBJ_obj2txt() behaviour.
3465 *) Add support for building of engines under engine/ as shared libraries
3466 under VC++ build system.
3469 *) Corrected the numerous bugs in the Win32 path splitter in DSO.
3470 Hopefully, we will not see any false combination of paths any more.
3473 Changes between 0.9.8 and 0.9.8a [11 Oct 2005]
3475 *) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
3476 (part of SSL_OP_ALL). This option used to disable the
3477 countermeasure against man-in-the-middle protocol-version
3478 rollback in the SSL 2.0 server implementation, which is a bad
3479 idea. (CVE-2005-2969)
3481 [Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
3482 for Information Security, National Institute of Advanced Industrial
3483 Science and Technology [AIST], Japan)]
3485 *) Add two function to clear and return the verify parameter flags.
3488 *) Keep cipherlists sorted in the source instead of sorting them at
3489 runtime, thus removing the need for a lock.
3492 *) Avoid some small subgroup attacks in Diffie-Hellman.
3493 [Nick Mathewson and Ben Laurie]
3495 *) Add functions for well-known primes.
3498 *) Extended Windows CE support.
3499 [Satoshi Nakamura and Andy Polyakov]
3501 *) Initialize SSL_METHOD structures at compile time instead of during
3502 runtime, thus removing the need for a lock.
3505 *) Make PKCS7_decrypt() work even if no certificate is supplied by
3506 attempting to decrypt each encrypted key in turn. Add support to
3510 Changes between 0.9.7h and 0.9.8 [05 Jul 2005]
3512 [NB: OpenSSL 0.9.7i and later 0.9.7 patch levels were released after
3515 *) Add libcrypto.pc and libssl.pc for those who feel they need them.
3518 *) Change CA.sh and CA.pl so they don't bundle the CSR and the private
3519 key into the same file any more.
3522 *) Add initial support for Win64, both IA64 and AMD64/x64 flavors.
3525 *) Add -utf8 command line and config file option to 'ca'.
3526 [Stefan <stf@udoma.org]
3528 *) Removed the macro des_crypt(), as it seems to conflict with some
3529 libraries. Use DES_crypt().
3532 *) Correct naming of the 'chil' and '4758cca' ENGINEs. This
3533 involves renaming the source and generated shared-libs for
3534 both. The engines will accept the corrected or legacy ids
3535 ('ncipher' and '4758_cca' respectively) when binding. NB,
3536 this only applies when building 'shared'.
3537 [Corinna Vinschen <vinschen@redhat.com> and Geoff Thorpe]
3539 *) Add attribute functions to EVP_PKEY structure. Modify
3540 PKCS12_create() to recognize a CSP name attribute and
3541 use it. Make -CSP option work again in pkcs12 utility.
3544 *) Add new functionality to the bn blinding code:
3545 - automatic re-creation of the BN_BLINDING parameters after
3546 a fixed number of uses (currently 32)
3547 - add new function for parameter creation
3548 - introduce flags to control the update behaviour of the
3549 BN_BLINDING parameters
3550 - hide BN_BLINDING structure
3551 Add a second BN_BLINDING slot to the RSA structure to improve
3552 performance when a single RSA object is shared among several
3556 *) Add support for DTLS.
3557 [Nagendra Modadugu <nagendra@cs.stanford.edu> and Ben Laurie]
3559 *) Add support for DER encoded private keys (SSL_FILETYPE_ASN1)
3560 to SSL_CTX_use_PrivateKey_file() and SSL_use_PrivateKey_file()
3563 *) Remove buggy and incomplete DH cert support from
3564 ssl/ssl_rsa.c and ssl/s3_both.c
3567 *) Use SHA-1 instead of MD5 as the default digest algorithm for
3568 the apps/openssl applications.
3571 *) Compile clean with "-Wall -Wmissing-prototypes
3572 -Wstrict-prototypes -Wmissing-declarations -Werror". Currently
3573 DEBUG_SAFESTACK must also be set.
3576 *) Change ./Configure so that certain algorithms can be disabled by default.
3577 The new counterpiece to "no-xxx" is "enable-xxx".
3579 The patented RC5 and MDC2 algorithms will now be disabled unless
3580 "enable-rc5" and "enable-mdc2", respectively, are specified.
3582 (IDEA remains enabled despite being patented. This is because IDEA
3583 is frequently required for interoperability, and there is no license
3584 fee for non-commercial use. As before, "no-idea" can be used to
3585 avoid this algorithm.)
3589 *) Add processing of proxy certificates (see RFC 3820). This work was
3590 sponsored by KTH (The Royal Institute of Technology in Stockholm) and
3591 EGEE (Enabling Grids for E-science in Europe).
3594 *) RC4 performance overhaul on modern architectures/implementations, such
3595 as Intel P4, IA-64 and AMD64.
3598 *) New utility extract-section.pl. This can be used specify an alternative
3599 section number in a pod file instead of having to treat each file as
3600 a separate case in Makefile. This can be done by adding two lines to the
3603 =for comment openssl_section:XXX
3605 The blank line is mandatory.
3609 *) New arguments -certform, -keyform and -pass for s_client and s_server
3610 to allow alternative format key and certificate files and passphrase
3614 *) New structure X509_VERIFY_PARAM which combines current verify parameters,
3615 update associated structures and add various utility functions.
3617 Add new policy related verify parameters, include policy checking in
3618 standard verify code. Enhance 'smime' application with extra parameters
3619 to support policy checking and print out.
3622 *) Add a new engine to support VIA PadLock ACE extensions in the VIA C3
3623 Nehemiah processors. These extensions support AES encryption in hardware
3624 as well as RNG (though RNG support is currently disabled).
3625 [Michal Ludvig <michal@logix.cz>, with help from Andy Polyakov]
3627 *) Deprecate BN_[get|set]_params() functions (they were ignored internally).
3630 *) New FIPS 180-2 algorithms, SHA-224/-256/-384/-512 are implemented.
3631 [Andy Polyakov and a number of other people]
3633 *) Improved PowerPC platform support. Most notably BIGNUM assembler
3634 implementation contributed by IBM.
3635 [Suresh Chari, Peter Waltenberg, Andy Polyakov]
3637 *) The new 'RSA_generate_key_ex' function now takes a BIGNUM for the public
3638 exponent rather than 'unsigned long'. There is a corresponding change to
3639 the new 'rsa_keygen' element of the RSA_METHOD structure.
3640 [Jelte Jansen, Geoff Thorpe]
3642 *) Functionality for creating the initial serial number file is now
3643 moved from CA.pl to the 'ca' utility with a new option -create_serial.
3645 (Before OpenSSL 0.9.7e, CA.pl used to initialize the serial
3646 number file to 1, which is bound to cause problems. To avoid
3647 the problems while respecting compatibility between different 0.9.7
3648 patchlevels, 0.9.7e employed 'openssl x509 -next_serial' in
3649 CA.pl for serial number initialization. With the new release 0.9.8,
3650 we can fix the problem directly in the 'ca' utility.)
3653 *) Reduced header interdepencies by declaring more opaque objects in
3654 ossl_typ.h. As a consequence, including some headers (eg. engine.h) will
3655 give fewer recursive includes, which could break lazy source code - so
3656 this change is covered by the OPENSSL_NO_DEPRECATED symbol. As always,
3657 developers should define this symbol when building and using openssl to
3658 ensure they track the recommended behaviour, interfaces, [etc], but
3659 backwards-compatible behaviour prevails when this isn't defined.
3662 *) New function X509_POLICY_NODE_print() which prints out policy nodes.
3665 *) Add new EVP function EVP_CIPHER_CTX_rand_key and associated functionality.
3666 This will generate a random key of the appropriate length based on the
3667 cipher context. The EVP_CIPHER can provide its own random key generation
3668 routine to support keys of a specific form. This is used in the des and
3669 3des routines to generate a key of the correct parity. Update S/MIME
3670 code to use new functions and hence generate correct parity DES keys.
3671 Add EVP_CHECK_DES_KEY #define to return an error if the key is not
3672 valid (weak or incorrect parity).
3675 *) Add a local set of CRLs that can be used by X509_verify_cert() as well
3676 as looking them up. This is useful when the verified structure may contain
3677 CRLs, for example PKCS#7 signedData. Modify PKCS7_verify() to use any CRLs
3678 present unless the new PKCS7_NO_CRL flag is asserted.
3681 *) Extend ASN1 oid configuration module. It now additionally accepts the
3684 shortName = some long name, 1.2.3.4
3687 *) Reimplemented the BN_CTX implementation. There is now no more static
3688 limitation on the number of variables it can handle nor the depth of the
3689 "stack" handling for BN_CTX_start()/BN_CTX_end() pairs. The stack
3690 information can now expand as required, and rather than having a single
3691 static array of bignums, BN_CTX now uses a linked-list of such arrays
3692 allowing it to expand on demand whilst maintaining the usefulness of
3693 BN_CTX's "bundling".
3696 *) Add a missing BN_CTX parameter to the 'rsa_mod_exp' callback in RSA_METHOD
3697 to allow all RSA operations to function using a single BN_CTX.
3700 *) Preliminary support for certificate policy evaluation and checking. This
3701 is initially intended to pass the tests outlined in "Conformance Testing
3702 of Relying Party Client Certificate Path Processing Logic" v1.07.
3705 *) bn_dup_expand() has been deprecated, it was introduced in 0.9.7 and
3706 remained unused and not that useful. A variety of other little bignum
3707 tweaks and fixes have also been made continuing on from the audit (see
3711 *) Constify all or almost all d2i, c2i, s2i and r2i functions, along with
3712 associated ASN1, EVP and SSL functions and old ASN1 macros.
3715 *) BN_zero() only needs to set 'top' and 'neg' to zero for correct results,
3716 and this should never fail. So the return value from the use of
3717 BN_set_word() (which can fail due to needless expansion) is now deprecated;
3718 if OPENSSL_NO_DEPRECATED is defined, BN_zero() is a void macro.
3721 *) BN_CTX_get() should return zero-valued bignums, providing the same
3722 initialised value as BN_new().
3723 [Geoff Thorpe, suggested by Ulf Möller]
3725 *) Support for inhibitAnyPolicy certificate extension.
3728 *) An audit of the BIGNUM code is underway, for which debugging code is
3729 enabled when BN_DEBUG is defined. This makes stricter enforcements on what
3730 is considered valid when processing BIGNUMs, and causes execution to
3731 assert() when a problem is discovered. If BN_DEBUG_RAND is defined,
3732 further steps are taken to deliberately pollute unused data in BIGNUM
3733 structures to try and expose faulty code further on. For now, openssl will
3734 (in its default mode of operation) continue to tolerate the inconsistent
3735 forms that it has tolerated in the past, but authors and packagers should
3736 consider trying openssl and their own applications when compiled with
3737 these debugging symbols defined. It will help highlight potential bugs in
3738 their own code, and will improve the test coverage for OpenSSL itself. At
3739 some point, these tighter rules will become openssl's default to improve
3740 maintainability, though the assert()s and other overheads will remain only
3741 in debugging configurations. See bn.h for more details.
3742 [Geoff Thorpe, Nils Larsch, Ulf Möller]
projects / openssl.git / blob