asn1_check_version - API function
const char * asn1_check_version(const char * req_version);
const char * req_version
Required version number, or NULL.
Check that the version of the library is at minimum the requested one
and return the version string; return NULL if the condition is not
satisfied. If a NULL is passed to this function, no check is done, but
the version string is simply returned.
See ASN1_VERSION for a suitable req_version string.
Version string of run-time library, or NULL if the run-time library
does not meet the required version number.
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