DSA_size - get DSA signature size
#include <openssl/dsa.h> int DSA_size(DSA *dsa);
This function returns the size of an ASN.1 encoded DSA signature in bytes. It can be used to determine how much memory must be allocated for a DSA signature. dsa->q must not be NULL.
The size in bytes.
dsa(3), DSA_sign(3)
DSA_size() is available in all versions of SSLeay and OpenSSL.