-
OPENSSL INSTALLATION
--------------------
* NOTES.VMS (OpenVMS)
* NOTES.WIN (any supported Windows)
* NOTES.DJGPP (DOS platform with DJGPP)
+ * NOTES.ANDROID (obviously Android [NDK])
Notational conventions in this document
---------------------------------------
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)> system call if available.
+ 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.
likely to complement configuration command line with
suitable compiler-specific option.
- enable-tls1_3
- TODO(TLS1.3): Make this enabled by default
- Build support for TLS1.3. Note: This is a WIP feature and
- only a single draft version is supported. Implementations
- of different draft versions will negotiate TLS 1.2 instead
- of (draft) TLS 1.3. Use with caution!!
-
no-<prot>
Don't build support for negotiating the specified SSL/TLS
- protocol (one of ssl, ssl3, tls, tls1, tls1_1, tls1_2, dtls,
- dtls1 or dtls1_2). If "no-tls" is selected then all of tls1,
- tls1_1 and tls1_2 are disabled. Similarly "no-dtls" will
- disable dtls1 and dtls1_2. The "no-ssl" option is synonymous
- with "no-ssl3". Note this only affects version negotiation.
- OpenSSL will still provide the methods for applications to
- explicitly select the individual protocol versions.
+ protocol (one of ssl, ssl3, tls, tls1, tls1_1, tls1_2,
+ tls1_3, dtls, dtls1 or dtls1_2). If "no-tls" is selected then
+ all of tls1, tls1_1, tls1_2 and tls1_3 are disabled.
+ Similarly "no-dtls" will disable dtls1 and dtls1_2. The
+ "no-ssl" option is synonymous with "no-ssl3". Note this only
+ affects version negotiation. OpenSSL will still provide the
+ methods for applications to explicitly select the individual
+ protocol versions.
no-<prot>-method
As for no-<prot> but in addition do not build the methods for
applications to explicitly select individual protocol
- versions.
+ versions. Note that there is no "no-tls1_3-method" option
+ because there is no application method for TLSv1.3. Using
+ individual protocol methods directly is deprecated.
+ Applications should use TLS_method() instead.
enable-<alg>
Build with support for the specified algorithm, where <alg>
these flags interact with those variables.
VAR=value
- Assignment if environment variable for Configure. These
+ Assignment of environment variable for Configure. These
work just like normal environment variable assignments,
but are supported on all platforms and are confined to
the configuration scripts only. These assignments override
CPPDEFINES List of CPP macro definitions, separated
by a platform specific character (':' or
space for Unix, ';' for Windows, ',' for
- VMS). This can be used in place of -D.
+ VMS). This can be used instead of using
+ -D (or what corresponds to that on your
+ compiler) in CPPFLAGS.
CPPINCLUDES List of CPP inclusion directories, separated
the same way as for CPPDEFINES. This can
- be used in place of -I.
+ be used instead of -I (or what corresponds
+ to that on your compiler) in CPPFLAGS.
HASHBANGPERL Perl invocation to be inserted after '#!'
- in public perl scripts.
+ in public perl scripts (only relevant on
+ Unix).
LD The program linker (not used on Unix, $(CC)
is used there).
LDFLAGS Flags for the shared library, DSO and
RCFLAGS Flags for the Windows reources manipulator.
RM The command to remove files and directories.
- These can be mixed with flags given on the command line.
- Any variable assignment resets any corresponding flags
- given before it, so for example:
+ These cannot be mixed with compiling / linking flags given
+ on the command line. In other words, something like this
+ isn't permitted.
./config -DFOO CPPFLAGS=-DBAR -DCOOKIE
- Will end up having 'CPPFLAGS=-DBAR -DCOOKIE'.
+ Backward compatibility note:
+
+ To be compatible with older configuration scripts, the
+ environment variables are ignored if compiling / linking
+ flags are given on the command line, except for these:
- Here is how the flags documented above are collected as
- augmentation of these variables:
+ AR, CC, CXX, CROSS_COMPILE, HASHBANGPERL, PERL, RANLIB, RC
+ and WINDRES
- -Dxxx xxx is collected in CPPDEFINES
- -Ixxx xxx is collected in CPPINCLUDES
- -Wp,xxx collected in CPPFLAGS
- -Lxxx collected in LDFLAGS
- -lxxx collected in LDLIBS
- -Wp,xxx collected in LDLIBS
- -rpath xxx collected in LDLIBS
- -R xxx collected in LDLIBS
- -framework xxx collected in LDLIBS
- -static collected in LDLIBS
- -xxx collected in CFLAGS
- +xxx collected in CFLAGS
+ For example, the following command will not see -DBAR:
+
+ CPPFLAGS=-DBAR ./config -DCOOKIE
+
+ However, the following will see both set variables:
+
+ CC=gcc CROSS_COMPILE=x86_64-w64-mingw32- \
+ ./config -DCOOKIE
reconf
reconfigure
$ 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)
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 explicitely 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.
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