=pod =head1 NAME DSA_do_sign, DSA_do_verify - raw DSA signature operations =head1 SYNOPSIS #include DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); int DSA_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig, DSA *dsa); =head1 DESCRIPTION DSA_do_sign() computes a digital signature on the B byte message digest B using the private key B and returns it in a newly allocated B structure. L may be used to precompute part of the signing operation in case signature generation is time-critical. DSA_do_verify() verifies that the signature B matches a given message digest B of size B. B is the signer's public key. =head1 RETURN VALUES DSA_do_sign() returns the signature, NULL on error. DSA_do_verify() returns 1 for a valid signature, 0 for an incorrect signature and -1 on error. The error codes can be obtained by L. =head1 SEE ALSO L, L, L, L, L =head1 COPYRIGHT Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut