Changes between 0.9.5a and 0.9.6 [xx XXX 2000]
- *) EVP cipher enhancment. Add hooks for extra EVP features. This will allow
- various cipher parameters to be set in the EVP interface. Initially
- support added for variable key length ciphers via the
- EVP_CIPHER_CTX_set_key_length() function. Other cipher specific
- parameters will be added later via the new catchall 'ctrl' function.
- New functionality allows removal of S/MIME code RC2 hack. Still needs
- support in other library functions, also need to add return codes to
- some EVP functions.
+ *) Re-implement BN_mod_exp2_mont using independent (and larger) windows.
+ This makes DSA verification about 2 % faster.
+ [Bodo Moeller]
+
+ *) Increase maximum window size in BN_mod_exp_... to 6 bits instead of 5
+ (meaning that now 2^5 values will be precomputed, which is only 4 KB
+ plus overhead for 1024 bit moduli).
+ This makes exponentiations about 0.5 % faster for 1024 bit
+ exponents (as measured by "openssl speed rsa2048").
+ [Bodo Moeller]
+
+ *) Rename memory handling macros to avoid conflicts with other
+ software:
+ Malloc => OPENSSL_malloc
+ Malloc_locked => OPENSSL_malloc_locked
+ Realloc => OPENSSL_realloc
+ Free => OPENSSL_free
+ [Richard Levitte]
+
+ *) New function BN_mod_exp_mont_word for small bases (roughly 15%
+ faster than BN_mod_exp_mont, i.e. 7% for a full DH exchange).
+ [Bodo Moeller]
+
+ *) CygWin32 support.
+ [John Jarvie <jjarvie@newsguy.com>]
+
+ *) The type-safe stack code has been rejigged. It is now only compiled
+ in when OpenSSL is configured with the DEBUG_SAFESTACK option and
+ by default all type-specific stack functions are "#define"d back to
+ standard stack functions. This results in more streamlined output
+ but retains the type-safety checking possibilities of the original
+ approach.
+ [Geoff Thorpe]
+
+ *) The STACK code has been cleaned up, and certain type declarations
+ that didn't make a lot of sense have been brought in line. This has
+ also involved a cleanup of sorts in safestack.h to more correctly
+ map type-safe stack functions onto their plain stack counterparts.
+ This work has also resulted in a variety of "const"ifications of
+ lots of the code, especially "_cmp" operations which should normally
+ be prototyped with "const" parameters anyway.
+ [Geoff Thorpe]
+
+ *) When generating bytes for the first time in md_rand.c, 'stir the pool'
+ by seeding with STATE_SIZE dummy bytes (with zero entropy count).
+ (The PRNG state consists of two parts, the large pool 'state' and 'md',
+ where all of 'md' is used each time the PRNG is used, but 'state'
+ is used only indexed by a cyclic counter. As entropy may not be
+ well distributed from the beginning, 'md' is important as a
+ chaining variable. However, the output function chains only half
+ of 'md', i.e. 80 bits. ssleay_rand_add, on the other hand, chains
+ all of 'md', and seeding with STATE_SIZE dummy bytes will result
+ in all of 'state' being rewritten, with the new values depending
+ on virtually all of 'md'. This overcomes the 80 bit limitation.)
+ [Bodo Moeller]
+
+ *) In ssl/s2_clnt.c and ssl/s3_clnt.c, call ERR_clear_error() when
+ the handshake is continued after ssl_verify_cert_chain();
+ otherwise, if SSL_VERIFY_NONE is set, remaining error codes
+ can lead to 'unexplainable' connection aborts later.
+ [Bodo Moeller; problem tracked down by Lutz Jaenicke]
+
+ *) Major EVP API cipher revision.
+ Add hooks for extra EVP features. This allows various cipher
+ parameters to be set in the EVP interface. Support added for variable
+ key length ciphers via the EVP_CIPHER_CTX_set_key_length() function and
+ setting of RC2 and RC5 parameters.
+
+ Modify EVP_OpenInit() and EVP_SealInit() to cope with variable key length
+ ciphers.
+
+ Remove lots of duplicated code from the EVP library. For example *every*
+ cipher init() function handles the 'iv' in the same way according to the
+ cipher mode. They also all do nothing if the 'key' parameter is NULL and
+ for CFB and OFB modes they zero ctx->num.
+
+ New functionality allows removal of S/MIME code RC2 hack.
+
+ Most of the routines have the same form and so can be declared in terms
+ of macros.
+
+ By shifting this to the top level EVP_CipherInit() it can be removed from
+ all individual ciphers. If the cipher wants to handle IVs or keys
+ differently it can set the EVP_CIPH_CUSTOM_IV or EVP_CIPH_ALWAYS_CALL_INIT
+ flags.
+
+ Change lots of functions like EVP_EncryptUpdate() to now return a
+ value: although software versions of the algorithms cannot fail
+ any installed hardware versions can.
[Steve Henson]
*) Implement SSL_OP_TLS_ROLLBACK_BUG: In ssl3_get_client_key_exchange, if
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