5 DSA_do_sign, DSA_do_verify - raw DSA signature operations
9 #include <openssl/dsa.h>
11 DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
13 int DSA_do_verify(const unsigned char *dgst, int dgst_len,
14 DSA_SIG *sig, DSA *dsa);
18 DSA_do_sign() computes a digital signature on the B<len> byte message
19 digest B<dgst> using the private key B<dsa> and returns it in a
20 newly allocated B<DSA_SIG> structure.
22 L<DSA_sign_setup(3)> may be used to precompute part
23 of the signing operation in case signature generation is
26 DSA_do_verify() verifies that the signature B<sig> matches a given
27 message digest B<dgst> of size B<len>. B<dsa> is the signer's public
32 DSA_do_sign() returns the signature, NULL on error. DSA_do_verify()
33 returns 1 for a valid signature, 0 for an incorrect signature and -1
34 on error. The error codes can be obtained by
39 L<dsa(3)>, L<ERR_get_error(3)>, L<rand(3)>,
45 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
47 Licensed under the OpenSSL license (the "License"). You may not use
48 this file except in compliance with the License. You can obtain a copy
49 in the file LICENSE in the source distribution or at
50 L<https://www.openssl.org/source/license.html>.