freebsd man page for dsa_size

DSA_size(3SSL)							      OpenSSL							    DSA_size(3SSL)

NAME
       DSA_size - get DSA signature size

SYNOPSIS
	#include <openssl/dsa.h>

	int DSA_size(const DSA *dsa);

DESCRIPTION
       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.

RETURN VALUE
       The size in bytes.

SEE ALSO
       dsa(3), DSA_sign(3)

HISTORY
       DSA_size() is available in all versions of SSLeay and OpenSSL.

1.0.1e								    2013-02-11							    DSA_size(3SSL)