OPENSSL_VERSION_NUMBER(3)  Library Functions Manual  OPENSSL_VERSION_NUMBER(3)

NAME
     OPENSSL_VERSION_NUMBER, LIBRESSL_VERSION_NUMBER, LIBRESSL_VERSION_TEXT,
     OPENSSL_VERSION_TEXT, OpenSSL_version_num, OpenSSL_version, SSLeay,
     SSLeay_version - get OpenSSL version number

SYNOPSIS
     #include <openssl/opensslv.h>

     #define OPENSSL_VERSION_NUMBER 0x020000000L
     #define LIBRESSL_VERSION_NUMBER 0x02nnnn00fL
     #define LIBRESSL_VERSION_TEXT "LibreSSL 2.n.n"
     #define OPENSSL_VERSION_TEXT LIBRESSL_VERSION_TEXT

     #include <openssl/crypto.h>

     unsigned long
     OpenSSL_version_num(void);

     const char *
     OpenSSL_version(int t);

     long
     SSLeay(void);

     const char *
     SSLeay_version(int t);

DESCRIPTION
     OPENSSL_VERSION_NUMBER and LIBRESSL_VERSION_NUMBER are numeric release
     version identifiers.  The first two digits contain the major release
     number, the third and fourth digits the minor release number, and the
     fifth and sixth digits the fix release number.  For OpenSSL, the seventh
     and eight digits contain the patch release number and the final digit is
     0 for development, 1 to e for betas 1 to 14, or f for release.  For
     LibreSSL, OPENSSL_VERSION_NUMBER is always 0x020000000, and
     LIBRESSL_VERSION_NUMBER always ends with 00f.

     For example:

           OPENSSL_VERSION_NUMBER:
           0x000906000 == 0.9.6 dev
           0x000906023 == 0.9.6b beta 3
           0x00090605f == 0.9.6e release
           0x020000000 == 2.0.0 for any version of LibreSSL

           LIBRESSL_VERSION_NUMBER:
           0x02070000f == LibreSSL 2.7.0

     OpenSSL versions prior to 0.9.3 had identifiers < 0x0930.  For versions
     between 0.9.3 and 0.9.5, the seventh digit was 1 for release and 0
     otherwise, and the eighth and ninth digits were the patch release number.

     For example:

     0x000904100 == 0.9.4 release
     0x000905000 == 0.9.5 dev

     OpenSSL 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.

     OpenSSL_version_num() returns OPENSSL_VERSION_NUMBER.

     OpenSSL_version() returns different strings depending on t:

     OPENSSL_VERSION
             The text variant of the version number, OPENSSL_VERSION_TEXT.
             For OpenSSL, it includes the release date, for example "OpenSSL
             0.9.5a 1 Apr 2000".  For LibreSSL, LIBRESSL_VERSION_TEXT is
             returned.

     OPENSSL_CFLAGS
             The compiler flags set for the compilation process in the form
             "compiler: ..." if available or "compiler: information not
             available" otherwise.  LibreSSL never provides compiler
             information.

     OPENSSL_BUILT_ON
             The date of the build process in the form "built on: ..." if
             available or "built on: date not available" otherwise.  LibreSSL
             never provides information on the build date.

     OPENSSL_PLATFORM
             The Configure target of the library build in the form "platform:
             ..." if available or "platform: information not available"
             otherwise.  LibreSSL never provides platform information.

     OPENSSL_DIR
             The OPENSSLDIR setting of the library build in the form
             "OPENSSLDIR: "..."" if available or "OPENSSLDIR: N/A" otherwise.
             For LibreSSL, the default is "OPENSSLDIR: "/etc/ssl"".

     OPENSSL_ENGINES_DIR
             The ENGINESDIR setting of the library build in the form
             "ENGINESDIR: "..."" if available or "ENGINESDIR: N/A" otherwise.
             LibreSSL never provides or uses an ENGINESDIR.

     For an unknown t, the text "not available" is returned.

     For backward compatibility, SSLEAY_VERSION_NUMBER is an alias for
     OPENSSL_VERSION_NUMBER and SSLeay() for OpenSSL_version_num().  The
     legacy function SSLeay_version() is similar to OpenSSL_version() except
     that it takes arguments SSLEAY_VERSION, SSLEAY_CFLAGS, SSLEAY_BUILT_ON,
     SSLEAY_PLATFORM, and SSLEAY_DIR which expand to other numerical values
     than the corresponding OPENSSL_* macros.

RETURN VALUES
     OpenSSL_version_num() and SSLeay() return a constant version number.

     OpenSSL_version() and SSLeay_version() return pointers to static strings.

SEE ALSO
     crypto(3), OPENSSL_config(3)

HISTORY
     SSLeay(), SSLeay_version(), and SSLEAY_VERSION_NUMBER first appeared in
     SSLeay 0.6.0 and have been available since OpenBSD 2.4.

     OPENSSL_VERSION_NUMBER first appeared in the first OpenSSL release,
     OpenSSL 0.9.1c, and has been available since OpenBSD 2.6.

     SSLEAY_DIR first appeared in OpenSSL 0.9.7 and have been available since
     OpenBSD 3.2.

     LIBRESSL_VERSION_NUMBER first appeared in LibreSSL 2.0.0 and OpenBSD 5.6
     and got its final format in LibreSSL 2.3.2 and OpenBSD 5.9.
     LIBRESSL_VERSION_TEXT first appeared in LibreSSL 2.2.2 and OpenBSD 5.8.

     OpenSSL_version_num() and OpenSSL_version() first appeared in OpenSSL
     1.1.0 and have been available since LibreSSL 2.7.1 and OpenBSD 6.3.

Linux 6.8.7-arch1-1            November 16, 2023           Linux 6.8.7-arch1-1