5 This document describes installation on all supported operating
6 systems (the Linux/Unix family, OpenVMS and Windows)
8 To install OpenSSL, you will need:
10 * A make implementation
11 * Perl 5 with core modules (please read NOTES.PERL)
12 * The perl module Text::Template (please read NOTES.PERL)
14 * a development environment in the form of development libraries and C
16 * a supported operating system
18 For additional platform specific requirements, solutions to specific
19 issues and other details, please read one of these:
21 * NOTES.UNIX (any supported Unix like system)
23 * NOTES.WIN (any supported Windows)
24 * NOTES.DJGPP (DOS platform with DJGPP)
26 Notational conventions in this document
27 ---------------------------------------
29 Throughout this document, we use the following conventions in command
32 $ command Any line starting with a dollar sign
33 ($) is a command line.
35 { word1 | word2 | word3 } This denotes a mandatory choice, to be
36 replaced with one of the given words.
37 A simple example would be this:
39 $ echo { FOO | BAR | COOKIE }
41 which is to be understood as one of
50 [ word1 | word2 | word3 ] Similar to { word1 | word2 | word3 }
51 except it's optional to give any of
52 those. In addition to the examples
53 above, this would also be valid:
57 {{ target }} This denotes a mandatory word or
58 sequence of words of some sort. A
59 simple example would be this:
63 which is to be understood to use the
64 command 'type' on some file name
65 determined by the user.
67 [[ options ]] Similar to {{ target }}, but is
70 Note that the notation assumes spaces around {, }, [, ], {{, }} and
71 [[, ]]. This is to differentiate from OpenVMS directory
72 specifications, which also use [ and ], but without spaces.
77 If you want to just get on with it, do:
93 on Windows (only pick one of the targets for configuration):
95 $ perl Configure { VC-WIN32 | VC-WIN64A | VC-WIN64I | VC-CE }
100 If any of these steps fails, see section Installation in Detail below.
102 This will build and install OpenSSL in the default location, which is:
104 Unix: normal installation directories under /usr/local
105 OpenVMS: SYS$COMMON:[OPENSSL-'version'...], where 'version' is the
106 OpenSSL version number with underscores instead of periods.
107 Windows: C:\Program Files\OpenSSL or C:\Program Files (x86)\OpenSSL
109 If you want to install it anywhere else, run config like this:
113 $ ./config --prefix=/opt/openssl --openssldir=/usr/local/ssl
117 $ @config --prefix=PROGRAM:[INSTALLS] --openssldir=SYS$MANAGER:[OPENSSL]
119 (Note: if you do add options to the configuration command, please make sure
120 you've read more than just this Quick Start, such as relevant NOTES.* files,
121 the options outline below, as configuration options may change the outcome
122 in otherwise unexpected ways)
125 Configuration Options
126 ---------------------
128 There are several options to ./config (or ./Configure) to customize
129 the build (note that for Windows, the defaults for --prefix and
130 --openssldir depend in what configuration is used and what Windows
131 implementation OpenSSL is built on. More notes on this in NOTES.WIN):
134 Don't build with support for deprecated APIs below the
135 specified version number. For example "--api=1.1.0" will
136 remove support for all APIS that were deprecated in OpenSSL
137 version 1.1.0 or below.
139 --cross-compile-prefix=PREFIX
140 The PREFIX to include in front of commands for your
141 toolchain. It's likely to have to end with dash, e.g.
142 a-b-c- would invoke GNU compiler as a-b-c-gcc, etc.
143 Unfortunately cross-compiling is too case-specific to
144 put together one-size-fits-all instructions. You might
145 have to pass more flags or set up environment variables
146 to actually make it work. Android and iOS cases are
147 discussed in corresponding Configurations/10-main.cf
148 sections. But there are cases when this option alone is
149 sufficient. For example to build the mingw64 target on
150 Linux "--cross-compile-prefix=x86_64-w64-mingw32-"
151 works. Naturally provided that mingw packages are
152 installed. Today Debian and Ubuntu users have option to
153 install a number of prepackaged cross-compilers along
154 with corresponding run-time and development packages for
155 "alien" hardware. To give another example
156 "--cross-compile-prefix=mipsel-linux-gnu-" suffices
157 in such case. Needless to mention that you have to
158 invoke ./Configure, not ./config, and pass your target
162 Build OpenSSL with debugging symbols.
165 The name of the directory under the top of the installation
166 directory tree (see the --prefix option) where libraries will
167 be installed. By default this is "lib". Note that on Windows
168 only ".lib" files will be stored in this location. dll files
169 will always be installed to the "bin" directory.
172 Directory for OpenSSL configuration files, and also the
173 default certificate and key store. Defaults are:
176 Windows: C:\Program Files\Common Files\SSL
177 or C:\Program Files (x86)\Common Files\SSL
178 OpenVMS: SYS$COMMON:[OPENSSL-COMMON]
181 The top of the installation directory tree. Defaults are:
184 Windows: C:\Program Files\OpenSSL
185 or C:\Program Files (x86)\OpenSSL
186 OpenVMS: SYS$COMMON:[OPENSSL-'version']
189 Build OpenSSL without debugging symbols. This is the default.
192 This is a developer flag that switches on various compiler
193 options recommended for OpenSSL development. It only works
194 when using gcc or clang as the compiler. If you are
195 developing a patch for OpenSSL then it is recommended that
196 you use this option where possible.
198 --with-zlib-include=DIR
199 The directory for the location of the zlib include file. This
200 option is only necessary if enable-zlib (see below) is used
201 and the include file is not already on the system include
205 On Unix: this is the directory containing the zlib library.
206 If not provided the system library path will be used.
207 On Windows: this is the filename of the zlib library (with or
208 without a path). This flag must be provided if the
209 zlib-dynamic option is not also used. If zlib-dynamic is used
210 then this flag is optional and a default value ("ZLIB1") is
211 used if not provided.
212 On VMS: this is the filename of the zlib library (with or
213 without a path). This flag is optional and if not provided
214 then "GNV$LIBZSHR", "GNV$LIBZSHR32" or "GNV$LIBZSHR64" is
215 used by default depending on the pointer size chosen.
218 Don't build the AFALG engine. This option will be forced if
219 on a platform that does not support AFALG.
222 Build with the Address sanitiser. This is a developer option
223 only. It may not work on all platforms and should never be
224 used in production environments. It will only work when used
225 with gcc or clang and should be used in conjunction with the
229 Do not use assembler code. On some platforms a small amount
230 of assembler code may still be used.
233 Do not build support for async operations.
236 Don't automatically load all supported ciphers and digests.
237 Typically OpenSSL will make available all of its supported
238 ciphers and digests. For a statically linked application this
239 may be undesirable if small executable size is an objective.
240 This only affects libcrypto. Ciphers and digests will have to
241 be loaded manually using EVP_add_cipher() and
242 EVP_add_digest() if this option is used. This option will
243 force a non-shared build.
246 Don't automatically load all libcrypto/libssl error strings.
247 Typically OpenSSL will automatically load human readable
248 error strings. For a statically linked application this may
249 be undesirable if small executable size is an objective.
253 Don't build the CAPI engine. This option will be forced if
254 on a platform that does not support CAPI.
257 Don't build support for CMS features
260 Don't build support for SSL/TLS compression. If this option
261 is left enabled (the default), then compression will only
262 work if the zlib or zlib-dynamic options are also chosen.
265 Build support for debugging memory allocated via
266 OPENSSL_malloc() or OPENSSL_zalloc().
268 enable-crypto-mdebug-backtrace
269 As for crypto-mdebug, but additionally provide backtrace
270 information for allocated memory.
271 TO BE USED WITH CARE: this uses GNU C functionality, and
272 is therefore not usable for non-GNU config targets. If
273 your build complains about the use of '-rdynamic' or the
274 lack of header file execinfo.h, this option is not for you.
275 ALSO NOTE that even though execinfo.h is available on your
276 system (through Gnulib), the functions might just be stubs
280 Don't build support for Certificate Transparency.
283 Don't build with support for any deprecated APIs. This is the
284 same as using "--api" and supplying the latest version
288 Don't build support for datagram based BIOs. Selecting this
289 option will also force the disabling of DTLS.
292 Don't build support for loading Dynamic Shared Objects.
295 Don't build the dynamically loaded engines. This only has an
296 effect in a "shared" build
299 Don't build support for Elliptic Curves.
302 Don't build support for binary Elliptic Curves
304 enable-ec_nistp_64_gcc_128
305 Enable support for optimised implementations of some commonly
306 used NIST elliptic curves. This is only supported on some
310 Build support for gathering entropy from EGD (Entropy
314 Don't build support for loading engines.
317 Don't compile in any error strings.
319 enable-external-tests
320 Enable building of integration with external test suites.
321 This is a developer option and may not work on all platforms.
322 The only supported external test suite at the current time is
323 the BoringSSL test suite. See the file test/README.external
327 Don't compile in filename and line number information (e.g.
328 for errors and memory allocation).
330 enable-fuzz-libfuzzer, enable-fuzz-afl
331 Build with support for fuzzing using either libfuzzer or AFL.
332 These are developer options only. They may not work on all
333 platforms and should never be used in production environments.
334 See the file fuzz/README.md for further details.
337 Don't build support for GOST based ciphersuites. Note that
338 if this feature is enabled then GOST ciphersuites are only
339 available if the GOST algorithms are also available through
340 loading an externally supplied engine.
343 Don't build the padlock engine.
346 Don't generate dependencies.
349 Don't build support for writing multiple records in one
350 go in libssl (Note: this is a different capability to the
351 pipelining functionality).
354 Don't build support for the NPN TLS extension.
357 Don't build support for OCSP.
360 Don't build with support for Position Independent Code.
363 Don't use POSIX IO capabilities.
366 Don't build support for Pre-Shared Key based ciphersuites.
369 Don't use hardware RDRAND capabilities.
372 Don't build support for RFC3779 ("X.509 Extensions for IP
373 Addresses and AS Identifiers")
376 Build support for SCTP
379 Do not create shared libraries, only static ones. See "Note
380 on shared libraries" below.
383 Don't build support for socket BIOs
386 Don't build support for SRP or SRP based ciphersuites.
389 Don't build SRTP support
392 Exclude SSE2 code paths from 32-bit x86 assembly modules.
393 Normally SSE2 extension is detected at run-time, but the
394 decision whether or not the machine code will be executed
395 is taken solely on CPU capability vector. This means that
396 if you happen to run OS kernel which does not support SSE2
397 extension on Intel P4 processor, then your application
398 might be exposed to "illegal instruction" exception.
399 There might be a way to enable support in kernel, e.g.
400 FreeBSD kernel can be compiled with CPU_ENABLE_SSE, and
401 there is a way to disengage SSE2 code paths upon application
402 start-up, but if you aim for wider "audience" running
403 such kernel, consider no-sse2. Both the 386 and
404 no-asm options imply no-sse2.
407 Build with the SSL Trace capabilities (adds the "-trace"
408 option to s_client and s_server).
411 Don't build the statically linked engines. This only
412 has an impact when not built "shared".
415 Don't use anything from the C header file "stdio.h" that
416 makes use of the "FILE" type. Only libcrypto and libssl can
417 be built in this way. Using this option will suppress
418 building the command line applications. Additionally since
419 the OpenSSL tests also use the command line applications the
420 tests will also be skipped.
423 Don't build test programs or run any test.
426 Don't try to build with support for multi-threaded
430 Build with support for multi-threaded applications. Most
431 platforms will enable this by default. However if on a
432 platform where this is not the case then this will usually
433 require additional system-dependent options! See "Note on
434 multi-threading" below.
436 enable-tls13downgrade
437 TODO(TLS1.3): Make this enabled by default and remove the
438 option when TLSv1.3 is out of draft
439 TLSv1.3 offers a downgrade protection mechanism. This is
440 implemented but disabled by default. It should not typically
441 be enabled except for testing purposes. Otherwise this could
442 cause problems if a pre-RFC version of OpenSSL talks to an
443 RFC implementation (it will erroneously be detected as a
447 Don't build Time Stamping Authority support.
450 Build with the Undefined Behaviour sanitiser. This is a
451 developer option only. It may not work on all platforms and
452 should never be used in production environments. It will only
453 work when used with gcc or clang and should be used in
454 conjunction with the "-DPEDANTIC" option (or the
455 --strict-warnings option).
458 Don't build with the "UI" capability (i.e. the set of
459 features enabling text based prompts).
462 Enable additional unit test APIs. This should not typically
463 be used in production deployments.
465 enable-weak-ssl-ciphers
466 Build support for SSL/TLS ciphers that are considered "weak"
467 (e.g. RC4 based ciphersuites).
470 Build with support for zlib compression/decompression.
473 Like "zlib", but has OpenSSL load the zlib library
474 dynamically when needed. This is only supported on systems
475 where loading of shared libraries is supported.
478 In 32-bit x86 builds, when generating assembly modules,
479 use the 80386 instruction set only (the default x86 code
480 is more efficient, but requires at least a 486). Note:
481 This doesn't affect code generated by compiler, you're
482 likely to complement configuration command line with
483 suitable compiler-specific option.
486 TODO(TLS1.3): Make this enabled by default
487 Build support for TLS1.3. Note: This is a WIP feature and
488 only a single draft version is supported. Implementations
489 of different draft versions will negotiate TLS 1.2 instead
490 of (draft) TLS 1.3. Use with caution!!
493 Don't build support for negotiating the specified SSL/TLS
494 protocol (one of ssl, ssl3, tls, tls1, tls1_1, tls1_2, dtls,
495 dtls1 or dtls1_2). If "no-tls" is selected then all of tls1,
496 tls1_1 and tls1_2 are disabled. Similarly "no-dtls" will
497 disable dtls1 and dtls1_2. The "no-ssl" option is synonymous
498 with "no-ssl3". Note this only affects version negotiation.
499 OpenSSL will still provide the methods for applications to
500 explicitly select the individual protocol versions.
503 As for no-<prot> but in addition do not build the methods for
504 applications to explicitly select individual protocol
508 Build with support for the specified algorithm, where <alg>
509 is one of: md2 or rc5.
512 Build without support for the specified algorithm, where
513 <alg> is one of: bf, blake2, camellia, cast, chacha, cmac,
514 des, dh, dsa, ecdh, ecdsa, idea, md4, mdc2, ocb, poly1305,
515 rc2, rc4, rmd160, scrypt, seed, siphash, sm3, sm4 or
516 whirlpool. The "ripemd" algorithm is deprecated and if used
517 is synonymous with rmd160.
519 -Dxxx, lxxx, -Lxxx, -Wl, -rpath, -R, -framework, -static
520 These system specific options will be recognised and
521 passed through to the compiler to allow you to define
522 preprocessor symbols, specify additional libraries, library
523 directories or other compiler options. It might be worth
524 noting that some compilers generate code specifically for
525 processor the compiler currently executes on. This is not
526 necessarily what you might have in mind, since it might be
527 unsuitable for execution on other, typically older,
528 processor. Consult your compiler documentation.
531 Additional options that are not otherwise recognised are
532 passed through as they are to the compiler as well. Again,
533 consult your compiler documentation.
536 Assignment if environment variable for Configure. These
537 work just like normal environment variable assignments,
538 but are supported on all platforms and are confined to
539 the configuration scripts only. These assignments override
540 the corresponding value in the inherited environment, if
545 Reconfigure from earlier data. This fetches the previous
546 command line options and environment from data saved in
547 "configdata.pm", and runs the configuration process again,
548 using these options and environment.
549 Note: NO other option is permitted together with "reconf".
550 This means that you also MUST use "./Configure" (or
551 what corresponds to that on non-Unix platforms) directly
552 to invoke this option.
553 Note: The original configuration saves away values for ALL
554 environment variables that were used, and if they weren't
555 defined, they are still saved away with information that
556 they weren't originally defined. This information takes
557 precedence over environment variables that are defined
560 Installation in Detail
561 ----------------------
563 1a. Configure OpenSSL for your operation system automatically:
565 NOTE: This is not available on Windows.
567 $ ./config [[ options ]] # Unix
571 $ @config [[ options ]] ! OpenVMS
573 For the remainder of this text, the Unix form will be used in all
574 examples, please use the appropriate form for your platform.
576 This guesses at your operating system (and compiler, if necessary) and
577 configures OpenSSL based on this guess. Run ./config -t to see
578 if it guessed correctly. If you want to use a different compiler, you
579 are cross-compiling for another platform, or the ./config guess was
580 wrong for other reasons, go to step 1b. Otherwise go to step 2.
582 On some systems, you can include debugging information as follows:
584 $ ./config -d [[ options ]]
586 1b. Configure OpenSSL for your operating system manually
588 OpenSSL knows about a range of different operating system, hardware and
589 compiler combinations. To see the ones it knows about, run
595 $ perl Configure # All other platforms
597 For the remainder of this text, the Unix form will be used in all
598 examples, please use the appropriate form for your platform.
600 Pick a suitable name from the list that matches your system. For most
601 operating systems there is a choice between using "cc" or "gcc". When
602 you have identified your system (and if necessary compiler) use this name
603 as the argument to Configure. For example, a "linux-elf" user would
606 $ ./Configure linux-elf [[ options ]]
608 If your system isn't listed, you will have to create a configuration
609 file named Configurations/{{ something }}.conf and add the correct
610 configuration for your system. See the available configs as examples
611 and read Configurations/README and Configurations/README.design for
614 The generic configurations "cc" or "gcc" should usually work on 32 bit
617 Configure creates a build file ("Makefile" on Unix, "makefile" on Windows
618 and "descrip.mms" on OpenVMS) from a suitable template in Configurations,
619 and defines various macros in include/openssl/opensslconf.h (generated from
620 include/openssl/opensslconf.h.in).
622 1c. Configure OpenSSL for building outside of the source tree.
624 OpenSSL can be configured to build in a build directory separate from
625 the directory with the source code. It's done by placing yourself in
626 some other directory and invoking the configuration commands from
631 $ mkdir /var/tmp/openssl-build
632 $ cd /var/tmp/openssl-build
633 $ /PATH/TO/OPENSSL/SOURCE/config [[ options ]]
637 $ /PATH/TO/OPENSSL/SOURCE/Configure {{ target }} [[ options ]]
641 $ set default sys$login:
642 $ create/dir [.tmp.openssl-build]
643 $ set default [.tmp.openssl-build]
644 $ @[PATH.TO.OPENSSL.SOURCE]config [[ options ]]
648 $ @[PATH.TO.OPENSSL.SOURCE]Configure {{ target }} [[ options ]]
653 $ mkdir \temp-openssl
655 $ perl d:\PATH\TO\OPENSSL\SOURCE\Configure {{ target }} [[ options ]]
657 Paths can be relative just as well as absolute. Configure will
658 do its best to translate them to relative paths whenever possible.
660 2. Build OpenSSL by running:
663 $ mms ! (or mmk) OpenVMS
666 This will build the OpenSSL libraries (libcrypto.a and libssl.a on
667 Unix, corresponding on other platforms) and the OpenSSL binary
668 ("openssl"). The libraries will be built in the top-level directory,
669 and the binary will be in the "apps" subdirectory.
671 If the build fails, look at the output. There may be reasons
672 for the failure that aren't problems in OpenSSL itself (like
673 missing standard headers). If you are having problems you can
674 get help by sending an email to the openssl-users email list (see
675 https://www.openssl.org/community/mailinglists.html for details). If
676 it is a bug with OpenSSL itself, please open an issue on GitHub, at
677 https://github.com/openssl/openssl/issues. Please review the existing
678 ones first; maybe the bug was already reported or has already been
681 (If you encounter assembler error messages, try the "no-asm"
682 configuration option as an immediate fix.)
684 Compiling parts of OpenSSL with gcc and others with the system
685 compiler will result in unresolved symbols on some systems.
687 3. After a successful build, the libraries should be tested. Run:
691 $ nmake test # Windows
693 NOTE: you MUST run the tests from an unprivileged account (or
694 disable your privileges temporarily if your platform allows it).
696 If some tests fail, look at the output. There may be reasons for
697 the failure that isn't a problem in OpenSSL itself (like a
698 malfunction with Perl). You may want increased verbosity, that
699 can be accomplished like this:
701 $ make VERBOSE=1 test # Unix
703 $ mms /macro=(VERBOSE=1) test ! OpenVMS
705 $ nmake VERBOSE=1 test # Windows
707 If you want to run just one or a few specific tests, you can use
708 the make variable TESTS to specify them, like this:
710 $ make TESTS='test_rsa test_dsa' test # Unix
711 $ mms/macro="TESTS=test_rsa test_dsa" test ! OpenVMS
712 $ nmake TESTS='test_rsa test_dsa' test # Windows
714 And of course, you can combine (Unix example shown):
716 $ make VERBOSE=1 TESTS='test_rsa test_dsa' test
718 You can find the list of available tests like this:
720 $ make list-tests # Unix
721 $ mms list-tests ! OpenVMS
722 $ nmake list-tests # Windows
724 Have a look at the manual for the perl module Test::Harness to
725 see what other HARNESS_* variables there are.
727 If you find a problem with OpenSSL itself, try removing any
728 compiler optimization flags from the CFLAGS line in Makefile and
729 run "make clean; make" or corresponding.
731 To report a bug please open an issue on GitHub, at
732 https://github.com/openssl/openssl/issues.
734 For more details on how the make variables TESTS can be used,
735 see section TESTS in Detail below.
737 4. If everything tests ok, install OpenSSL with
739 $ make install # Unix
740 $ mms install ! OpenVMS
741 $ nmake install # Windows
743 This will install all the software components in this directory
744 tree under PREFIX (the directory given with --prefix or its
749 bin/ Contains the openssl binary and a few other
752 Contains the header files needed if you want
753 to build your own programs that use libcrypto
755 lib Contains the OpenSSL library files.
756 lib/engines Contains the OpenSSL dynamically loadable engines.
758 share/man/man1 Contains the OpenSSL command line man-pages.
759 share/man/man3 Contains the OpenSSL library calls man-pages.
760 share/man/man5 Contains the OpenSSL configuration format man-pages.
761 share/man/man7 Contains the OpenSSL other misc man-pages.
763 share/doc/openssl/html/man1
764 share/doc/openssl/html/man3
765 share/doc/openssl/html/man5
766 share/doc/openssl/html/man7
767 Contains the HTML rendition of the man-pages.
769 OpenVMS ('arch' is replaced with the architecture name, "Alpha"
770 or "ia64", 'sover' is replaced with the shared library version
771 (0101 for 1.1), and 'pz' is replaced with the pointer size
772 OpenSSL was built with):
774 [.EXE.'arch'] Contains the openssl binary.
775 [.EXE] Contains a few utility scripts.
777 Contains the header files needed if you want
778 to build your own programs that use libcrypto
780 [.LIB.'arch'] Contains the OpenSSL library files.
781 [.ENGINES'sover''pz'.'arch']
782 Contains the OpenSSL dynamically loadable engines.
783 [.SYS$STARTUP] Contains startup, login and shutdown scripts.
784 These define appropriate logical names and
786 [.SYSTEST] Contains the installation verification procedure.
787 [.HTML] Contains the HTML rendition of the manual pages.
790 Additionally, install will add the following directories under
791 OPENSSLDIR (the directory given with --openssldir or its default)
794 certs Initially empty, this is the default location
795 for certificate files.
796 private Initially empty, this is the default location
797 for private key files.
798 misc Various scripts.
800 Package builders who want to configure the library for standard
801 locations, but have the package installed somewhere else so that
802 it can easily be packaged, can use
804 $ make DESTDIR=/tmp/package-root install # Unix
805 $ mms/macro="DESTDIR=TMP:[PACKAGE-ROOT]" install ! OpenVMS
807 The specified destination directory will be prepended to all
808 installation target paths.
810 Compatibility issues with previous OpenSSL versions:
812 * COMPILING existing applications
814 OpenSSL 1.1.0 hides a number of structures that were previously
815 open. This includes all internal libssl structures and a number
816 of EVP types. Accessor functions have been added to allow
817 controlled access to the structures' data.
819 This means that some software needs to be rewritten to adapt to
820 the new ways of doing things. This often amounts to allocating
821 an instance of a structure explicitly where you could previously
822 allocate them on the stack as automatic variables, and using the
823 provided accessor functions where you would previously access a
824 structure's field directly.
826 Some APIs have changed as well. However, older APIs have been
827 preserved when possible.
829 Environment Variables
830 ---------------------
832 A number of environment variables can be used to provide additional control
833 over the build process. Typically these should be defined prior to running
834 config or Configure. Not all environment variables are relevant to all
838 The name of the ar executable to use.
841 Use a different build file name than the platform default
842 ("Makefile" on Unixly platforms, "makefile" on native Windows,
843 "descrip.mms" on OpenVMS). This requires that there is a
844 corresponding build file template. See Configurations/README
845 for further information.
848 The compiler to use. Configure will attempt to pick a default
849 compiler for your platform but this choice can be overridden
850 using this variable. Set it to the compiler executable you wish
851 to use, e.g. "gcc" or "clang".
854 This environment variable has the same meaning as for the
855 "--cross-compile-prefix" Configure flag described above. If both
856 are set then the Configure flag takes precedence.
859 The name of the nm executable to use.
861 OPENSSL_LOCAL_CONFIG_DIR
862 OpenSSL comes with a database of information about how it
863 should be built on different platforms as well as build file
864 templates for those platforms. The database is comprised of
865 ".conf" files in the Configurations directory. The build
866 file templates reside there as well as ".tmpl" files. See the
867 file Configurations/README for further information about the
868 format of ".conf" files as well as information on the ".tmpl"
870 In addition to the standard ".conf" and ".tmpl" files, it is
871 possible to create your own ".conf" and ".tmpl" files and store
872 them locally, outside the OpenSSL source tree. This environment
873 variable can be set to the directory where these files are held
874 and will be considered by Configure before it looks in the
875 standard directories.
878 The name of the Perl executable to use when building OpenSSL.
879 This variable is used in config script only. Configure on the
880 other hand imposes the interpreter by which it itself was
881 executed on the whole build procedure.
884 The command string for the Perl executable to insert in the
885 #! line of perl scripts that will be publically installed.
886 Default: /usr/bin/env perl
887 Note: the value of this variable is added to the same scripts
888 on all platforms, but it's only relevant on Unix-like platforms.
891 The name of the rc executable to use. The default will be as
892 defined for the target platform in the ".conf" file. If not
893 defined then "windres" will be used. The WINDRES environment
894 variable is synonymous to this. If both are defined then RC
898 The name of the ranlib executable to use.
906 The Configure script generates a Makefile in a format relevant to the specific
907 platform. The Makefiles provide a number of targets that can be used. Not all
908 targets may be available on all platforms. Only the most common targets are
909 described here. Examine the Makefiles themselves for the full list.
912 The default target to build all the software components.
915 Remove all build artefacts and return the directory to a "clean"
919 Rebuild the dependencies in the Makefiles. This is a legacy
920 option that no longer needs to be used in OpenSSL 1.1.0.
923 Install all OpenSSL components.
926 Only install the OpenSSL software components.
929 Only install the OpenSSL documentation components.
932 Only install the OpenSSL man pages (Unix only).
935 Only install the OpenSSL html documentation.
938 Prints a list of all the self test names.
941 Build and run the OpenSSL self tests.
944 Uninstall all OpenSSL components.
947 This is a developer option. If you are developing a patch for
948 OpenSSL you may need to use this if you want to update
949 automatically generated files; add new error codes or add new
950 (or change the visibility of) public API functions. (Unix only).
955 The make variable TESTS supports a versatile set of space separated tokens
956 with which you can specify a set of tests to be performed. With a "current
957 set of tests" in mind, initially being empty, here are the possible tokens:
959 alltests The current set of tests becomes the whole set of available
960 tests (as listed when you do 'make list-tests' or similar).
961 xxx Adds the test 'xxx' to the current set of tests.
962 -xxx Removes 'xxx' from the current set of tests. If this is the
963 first token in the list, the current set of tests is first
964 assigned the whole set of available tests, effectively making
965 this token equivalent to TESTS="alltests -xxx".
966 nn Adds the test group 'nn' (which is a number) to the current
968 -nn Removes the test group 'nn' from the current set of tests.
969 If this is the first token in the list, the current set of
970 tests is first assigned the whole set of available tests,
971 effectively making this token equivalent to
972 TESTS="alltests -xxx".
974 Also, all tokens except for "alltests" may have wildcards, such as *.
975 (on Unix and Windows, BSD style wildcards are supported, while on VMS,
976 it's VMS style wildcards)
978 Example: All tests except for the fuzz tests:
980 $ make TESTS=-test_fuzz test
982 or (if you want to be explicit)
984 $ make TESTS='alltests -test_fuzz' test
986 Example: All tests that have a name starting with "test_ssl" but not those
987 starting with "test_ssl_":
989 $ make TESTS='test_ssl* -test_ssl_*' test
991 Example: Only test group 10:
995 Example: All tests except the slow group (group 99):
999 Example: All tests in test groups 80 to 99 except for tests in group 90:
1001 $ make TESTS='[89]? -90'
1003 Note on multi-threading
1004 -----------------------
1006 For some systems, the OpenSSL Configure script knows what compiler options
1007 are needed to generate a library that is suitable for multi-threaded
1008 applications. On these systems, support for multi-threading is enabled
1009 by default; use the "no-threads" option to disable (this should never be
1012 On other systems, to enable support for multi-threading, you will have
1013 to specify at least two options: "threads", and a system-dependent option.
1014 (The latter is "-D_REENTRANT" on various systems.) The default in this
1015 case, obviously, is not to include support for multi-threading (but
1016 you can still use "no-threads" to suppress an annoying warning message
1017 from the Configure script.)
1019 OpenSSL provides built-in support for two threading models: pthreads (found on
1020 most UNIX/Linux systems), and Windows threads. No other threading models are
1021 supported. If your platform does not provide pthreads or Windows threads then
1022 you should Configure with the "no-threads" option.
1024 Notes on shared libraries
1025 -------------------------
1027 For most systems the OpenSSL Configure script knows what is needed to
1028 build shared libraries for libcrypto and libssl. On these systems
1029 the shared libraries will be created by default. This can be suppressed and
1030 only static libraries created by using the "no-shared" option. On systems
1031 where OpenSSL does not know how to build shared libraries the "no-shared"
1032 option will be forced and only static libraries will be created.
1034 Shared libraries are named a little differently on different platforms.
1035 One way or another, they all have the major OpenSSL version number as
1036 part of the file name, i.e. for OpenSSL 1.1.x, 1.1 is somehow part of
1039 On most POSIXly platforms, shared libraries are named libcrypto.so.1.1
1042 on Cygwin, shared libraries are named cygcrypto-1.1.dll and cygssl-1.1.dll
1043 with import libraries libcrypto.dll.a and libssl.dll.a.
1045 On Windows build with MSVC or using MingW, shared libraries are named
1046 libcrypto-1_1.dll and libssl-1_1.dll for 32-bit Windows, libcrypto-1_1-x64.dll
1047 and libssl-1_1-x64.dll for 64-bit x86_64 Windows, and libcrypto-1_1-ia64.dll
1048 and libssl-1_1-ia64.dll for IA64 Windows. With MSVC, the import libraries
1049 are named libcrypto.lib and libssl.lib, while with MingW, they are named
1050 libcrypto.dll.a and libssl.dll.a.
1052 On VMS, shareable images (VMS speak for shared libraries) are named
1053 ossl$libcrypto0101_shr.exe and ossl$libssl0101_shr.exe. However, when
1054 OpenSSL is specifically built for 32-bit pointers, the shareable images
1055 are named ossl$libcrypto0101_shr32.exe and ossl$libssl0101_shr32.exe
1056 instead, and when built for 64-bit pointers, they are named
1057 ossl$libcrypto0101_shr64.exe and ossl$libssl0101_shr64.exe.
1059 Note on random number generation
1060 --------------------------------
1062 Availability of cryptographically secure random numbers is required for
1063 secret key generation. OpenSSL provides several options to seed the
1064 internal PRNG. If not properly seeded, the internal PRNG will refuse
1065 to deliver random bytes and a "PRNG not seeded error" will occur.
1066 On systems without /dev/urandom (or similar) device, it may be necessary
1067 to install additional support software to obtain a random seed.
1068 Please check out the manual pages for RAND_add(), RAND_bytes(), RAND_egd(),
1069 and the FAQ for more information.
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