OPENSSL_VERSION_NUMBER is a numeric release version identifier:
MMNNFFPPS: major minor fix patch status
The status nibble has one of the values 0 for development, 1 to e for betas
1 to 14, and f for release.
0x000906000 == 0.9.6 dev
0x000906023 == 0.9.6b beta 3
0x00090605f == 0.9.6e release
Versions prior to 0.9.3 have identifiers < 0x0930.
Versions between 0.9.3 and 0.9.5 had a version identifier with this
MMNNFFRBB major minor fix final beta/patch
0x000904100 == 0.9.4 release
0x000905000 == 0.9.5 dev
Version 0.9.5a had an interim interpretation that is like the current one,
except the patch level got the highest bit set, to keep continuity. The
number was therefore 0x0090581f.
For backward compatibility, SSLEAY_VERSION_NUMBER is also defined.
SSLeay() returns this number. The return value can be compared to the
macro to make sure that the correct version of the library has been
loaded, especially when using DLLs on Windows systems.
SSLeay_version() returns different strings depending on t:
For an unknown t, the text not available is returned.
The text variant of the version number and the release date. For example,
OpenSSL 0.9.5a 1 Apr 2000.
The compiler flags set for the compilation process in the form
compiler: ... if available or compiler: information not available
The date of the build process in the form built on: ... if available
or built on: date not available otherwise.
The Configure target of the library build in the form platform: ...
if available or platform: information not available otherwise.
The OPENSSLDIR setting of the library build in the form OPENSSLDIR: ..."
if available or OPENSSLDIR: N/A" otherwise.