-
OPENSSL INSTALLATION
--------------------
This document describes installation on all supported operating
- systems (the Linux/Unix family, OpenVMS and Windows)
+ systems (the Unix/Linux family (which includes Mac OS/X), OpenVMS,
+ and Windows).
To install OpenSSL, you will need:
If you want to just get on with it, do:
- on Unix:
+ on Unix (again, this includes Mac OS/X):
$ ./config
$ make
put together one-size-fits-all instructions. You might
have to pass more flags or set up environment variables
to actually make it work. Android and iOS cases are
- discussed in corresponding Configurations/10-main.cf
- sections. But there are cases when this option alone is
+ discussed in corresponding Configurations/15-*.conf
+ files. But there are cases when this option alone is
sufficient. For example to build the mingw64 target on
Linux "--cross-compile-prefix=x86_64-w64-mingw32-"
works. Naturally provided that mingw packages are
"--cross-compile-prefix=mipsel-linux-gnu-" suffices
in such case. Needless to mention that you have to
invoke ./Configure, not ./config, and pass your target
- name explicitly.
+ name explicitly. Also, note that --openssldir refers
+ to target's file system, not one you are building on.
--debug
- Build OpenSSL with debugging symbols.
+ Build OpenSSL with debugging symbols and zero optimization
+ level.
--libdir=DIR
The name of the directory under the top of the installation
without a path). This flag must be provided if the
zlib-dynamic option is not also used. If zlib-dynamic is used
then this flag is optional and a default value ("ZLIB1") is
- used if not provided.
+ used if not provided.
On VMS: this is the filename of the zlib library (with or
without a path). This flag is optional and if not provided
then "GNV$LIBZSHR", "GNV$LIBZSHR32" or "GNV$LIBZSHR64" is
used by default depending on the pointer size chosen.
+
+ --with-rand-seed=seed1[,seed2,...]
+ A comma separated list of seeding methods which will be tried
+ by OpenSSL in order to obtain random input (a.k.a "entropy")
+ for seeding its cryptographically secure random number
+ generator (CSPRNG). The current seeding methods are:
+
+ os: Use a trusted operating system entropy source.
+ This is the default method if such an entropy
+ source exists.
+ getrandom: Use the L<getrandom(2)> or equivalent system
+ call.
+ devrandom: Use the the first device from the DEVRANDOM list
+ which can be opened to read random bytes. The
+ DEVRANDOM preprocessor constant expands to
+ "/dev/urandom","/dev/random","/dev/srandom" on
+ most unix-ish operating systems.
+ egd: Check for an entropy generating daemon.
+ rdcpu: Use the RDSEED or RDRAND command if provided by
+ the CPU.
+ librandom: Use librandom (not implemented yet).
+ none: Disable automatic seeding. This is the default
+ on some operating systems where no suitable
+ entropy source exists, or no support for it is
+ implemented yet.
+
+ For more information, see the section 'Note on random number
+ generation' at the end of this document.
+
no-afalgeng
Don't build the AFALG engine. This option will be forced if
on a platform that does not support AFALG.
+ enable-ktls
+ Build with Kernel TLS support. This option will enable the
+ use of the Kernel TLS data-path, which can improve
+ performance and allow for the use of sendfile and splice
+ system calls on TLS sockets. The Kernel may use TLS
+ accelerators if any are available on the system.
+ This option will be forced off on systems that do not support
+ the Kernel TLS data-path.
+
enable-asan
Build with the Address sanitiser. This is a developer option
only. It may not work on all platforms and should never be
no-shared option.
no-asm
- Do not use assembler code. On some platforms a small amount
- of assembler code may still be used.
+ Do not use assembler code. This should be viewed as
+ debugging/trouble-shooting option rather than production.
+ On some platforms a small amount of assembler code may
+ still be used even with this option.
no-async
Do not build support for async operations.
error strings. For a statically linked application this may
be undesirable if small executable size is an objective.
+ no-autoload-config
+ Don't automatically load the default openssl.cnf file.
+ Typically OpenSSL will automatically load a system config
+ file which configures default ssl options.
+
+ enable-buildtest-c++
+ While testing, generate C++ buildtest files that
+ simply check that the public OpenSSL header files
+ are usable standalone with C++.
+
+ Enabling this option demands extra care. For any
+ compiler flag given directly as configuration
+ option, you must ensure that it's valid for both
+ the C and the C++ compiler. If not, the C++ build
+ test will most likely break. As an alternative,
+ you can use the language specific variables, CFLAGS
+ and CXXFLAGS.
no-capieng
Don't build the CAPI engine. This option will be forced if
Don't build support for datagram based BIOs. Selecting this
option will also force the disabling of DTLS.
+ enable-devcryptoeng
+ Build the /dev/crypto engine. It is automatically selected
+ on BSD implementations, in which case it can be disabled with
+ no-devcryptoeng.
+
no-dso
Don't build support for loading Dynamic Shared Objects.
enable-ec_nistp_64_gcc_128
Enable support for optimised implementations of some commonly
- used NIST elliptic curves. This is only supported on some
- platforms.
+ used NIST elliptic curves.
+ This is only supported on platforms:
+ - with little-endian storage of non-byte types
+ - that tolerate misaligned memory references
+ - where the compiler:
+ - supports the non-standard type __uint128_t
+ - defines the built-in macro __SIZEOF_INT128__
enable-egd
Build support for gathering entropy from EGD (Entropy
available if the GOST algorithms are also available through
loading an externally supplied engine.
- no-hw-padlock
- Don't build the padlock engine.
-
no-makedepend
Don't generate dependencies.
no-ocsp
Don't build support for OCSP.
+ no-padlockeng
+ no-hw-padlock
+ Don't build the padlock engine.
+ ('no-hw-padlock' is deprecated and should not be used)
+
no-pic
Don't build with support for Position Independent Code.
+ no-pinshared By default OpenSSL will attempt to stay in memory until the
+ process exits. This is so that libcrypto and libssl can be
+ properly cleaned up automatically via an "atexit()" handler.
+ The handler is registered by libcrypto and cleans up both
+ libraries. On some platforms the atexit() handler will run on
+ unload of libcrypto (if it has been dynamically loaded)
+ rather than at process exit. This option can be used to stop
+ OpenSSL from attempting to stay in memory until the process
+ exits. This could lead to crashes if either libcrypto or
+ libssl have already been unloaded at the point
+ that the atexit handler is invoked, e.g. on a platform which
+ calls atexit() on unload of the library, and libssl is
+ unloaded before libcrypto then a crash is likely to happen.
+ Applications can suppress running of the atexit() handler at
+ run time by using the OPENSSL_INIT_NO_ATEXIT option to
+ OPENSSL_init_crypto(). See the man page for it for further
+ details.
+
no-posix-io
Don't use POSIX IO capabilities.
require additional system-dependent options! See "Note on
multi-threading" below.
- enable-tls13downgrade
- TODO(TLS1.3): Make this enabled by default and remove the
- option when TLSv1.3 is out of draft
- TLSv1.3 offers a downgrade protection mechanism. This is
- implemented but disabled by default. It should not typically
- be enabled except for testing purposes. Otherwise this could
- cause problems if a pre-RFC version of OpenSSL talks to an
- RFC implementation (it will erroneously be detected as a
- downgrade).
+ enable-trace
+ Build with support for the integrated tracing api. See manual pages
+ OSSL_trace_set_channel(3) and OSSL_trace_enabled(3) for details.
no-ts
Don't build Time Stamping Authority support.
Build without support for the specified algorithm, where
<alg> is one of: aria, bf, blake2, camellia, cast, chacha,
cmac, des, dh, dsa, ecdh, ecdsa, idea, md4, mdc2, ocb,
- poly1305, rc2, rc4, rmd160, scrypt, seed, siphash, sm3, sm4
- or whirlpool. The "ripemd" algorithm is deprecated and if
- used is synonymous with rmd160.
+ poly1305, rc2, rc4, rmd160, scrypt, seed, siphash, siv, sm2,
+ sm3, sm4 or whirlpool. The "ripemd" algorithm is deprecated
+ and if used is synonymous with rmd160.
-Dxxx, -Ixxx, -Wp, -lxxx, -Lxxx, -Wl, -rpath, -R, -framework, -static
These system specific options will be recognised and
Windows, and as a comma separated list of
libraries on VMS.
RANLIB The library archive indexer.
- RC The Windows resources manipulator.
- RCFLAGS Flags for the Windows reources manipulator.
+ RC The Windows resource compiler.
+ RCFLAGS Flags for the Windows resource compiler.
RM The command to remove files and directories.
These cannot be mixed with compiling / linking flags given
CC=gcc CROSS_COMPILE=x86_64-w64-mingw32- \
./config -DCOOKIE
+ If CC is set, it is advisable to also set CXX to ensure
+ both C and C++ compilers are in the same "family". This
+ becomes relevant with 'enable-external-tests' and
+ 'enable-buildtest-c++'.
+
reconf
reconfigure
Reconfigure from earlier data. This fetches the previous
$ nmake TESTS='test_rsa test_dsa' test # Windows
And of course, you can combine (Unix example shown):
-
+
$ make VERBOSE=1 TESTS='test_rsa test_dsa' test
You can find the list of available tests like this:
command symbols.
[.SYSTEST] Contains the installation verification procedure.
[.HTML] Contains the HTML rendition of the manual pages.
-
+
Additionally, install will add the following directories under
OPENSSLDIR (the directory given with --openssldir or its default)
* COMPILING existing applications
- OpenSSL 1.1.0 hides a number of structures that were previously
- open. This includes all internal libssl structures and a number
- of EVP types. Accessor functions have been added to allow
- controlled access to the structures' data.
+ Starting with version 1.1.0, OpenSSL hides a number of structures
+ that were previously open. This includes all internal libssl
+ structures and a number of EVP types. Accessor functions have
+ been added to allow controlled access to the structures' data.
This means that some software needs to be rewritten to adapt to
the new ways of doing things. This often amounts to allocating
BUILDFILE
Use a different build file name than the platform default
- ("Makefile" on Unixly platforms, "makefile" on native Windows,
+ ("Makefile" on Unix-like platforms, "makefile" on native Windows,
"descrip.mms" on OpenVMS). This requires that there is a
corresponding build file template. See Configurations/README
for further information.
depend
Rebuild the dependencies in the Makefiles. This is a legacy
- option that no longer needs to be used in OpenSSL 1.1.0.
+ option that no longer needs to be used since OpenSSL 1.1.0.
install
Install all OpenSSL components.
part of the file name, i.e. for OpenSSL 1.1.x, 1.1 is somehow part of
the name.
- On most POSIXly platforms, shared libraries are named libcrypto.so.1.1
+ On most POSIX platforms, shared libraries are named libcrypto.so.1.1
and libssl.so.1.1.
on Cygwin, shared libraries are named cygcrypto-1.1.dll and cygssl-1.1.dll
Availability of cryptographically secure random numbers is required for
secret key generation. OpenSSL provides several options to seed the
- internal PRNG. If not properly seeded, the internal PRNG will refuse
+ internal CSPRNG. If not properly seeded, the internal CSPRNG will refuse
to deliver random bytes and a "PRNG not seeded error" will occur.
- On systems without /dev/urandom (or similar) device, it may be necessary
- to install additional support software to obtain a random seed.
- Please check out the manual pages for RAND_add(), RAND_bytes(), RAND_egd(),
- and the FAQ for more information.
+ The seeding method can be configured using the --with-rand-seed option,
+ which can be used to specify a comma separated list of seed methods.
+ However in most cases OpenSSL will choose a suitable default method,
+ so it is not necessary to explicitly provide this option. Note also
+ that not all methods are available on all platforms.
+
+ I) On operating systems which provide a suitable randomness source (in
+ form of a system call or system device), OpenSSL will use the optimal
+ available method to seed the CSPRNG from the operating system's
+ randomness sources. This corresponds to the option --with-rand-seed=os.
+
+ II) On systems without such a suitable randomness source, automatic seeding
+ and reseeding is disabled (--with-rand-seed=none) and it may be necessary
+ to install additional support software to obtain a random seed and reseed
+ the CSPRNG manually. Please check out the manual pages for RAND_add(),
+ RAND_bytes(), RAND_egd(), and the FAQ for more information.
projects / openssl.git / blobdiff