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DSA_do_sign.pod
=pod =head1 NAME DSA_do_sign, DSA_do_verify - raw DSA signature operations =head1 SYNOPSIS #include <openssl/dsa.h> 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<len> byte message digest B<dgst> using the private key B<dsa> and returns it in a newly allocated B<DSA_SIG> structure. L<DSA_sign_setup(3)> 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<sig> matches a given message digest B<dgst> of size B<len>. B<dsa> 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<ERR_get_error(3)>. =head1 SEE ALSO L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>, L<DSA_SIG_new(3)>, L<DSA_sign(3)> =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<https://www.openssl.org/source/license.html>. =cut