1=pod 2 3=head1 NAME 4 5DSA_do_sign, DSA_do_verify - raw DSA signature operations 6 7=head1 SYNOPSIS 8 9 #include <openssl/dsa.h> 10 11 DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); 12 13 int DSA_do_verify(const unsigned char *dgst, int dgst_len, 14 DSA_SIG *sig, DSA *dsa); 15 16=head1 DESCRIPTION 17 18DSA_do_sign() computes a digital signature on the B<len> byte message 19digest B<dgst> using the private key B<dsa> and returns it in a 20newly allocated B<DSA_SIG> structure. 21 22L<DSA_sign_setup(3)> may be used to precompute part 23of the signing operation in case signature generation is 24time-critical. 25 26DSA_do_verify() verifies that the signature B<sig> matches a given 27message digest B<dgst> of size B<len>. B<dsa> is the signer's public 28key. 29 30=head1 RETURN VALUES 31 32DSA_do_sign() returns the signature, NULL on error. DSA_do_verify() 33returns 1 for a valid signature, 0 for an incorrect signature and -1 34on error. The error codes can be obtained by 35L<ERR_get_error(3)>. 36 37=head1 SEE ALSO 38 39L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>, 40L<DSA_SIG_new(3)>, 41L<DSA_sign(3)> 42 43=head1 COPYRIGHT 44 45Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 46 47Licensed under the OpenSSL license (the "License"). You may not use 48this file except in compliance with the License. You can obtain a copy 49in the file LICENSE in the source distribution or at 50L<https://www.openssl.org/source/license.html>. 51 52=cut 53