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