-
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)> 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.
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.
no-capieng
Don't build the CAPI engine. This option will be forced if
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
$ 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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