1cb7eff45b
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/9847)
71 lines
2.2 KiB
Text
71 lines
2.2 KiB
Text
=pod
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=head1 NAME
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DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures
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=head1 SYNOPSIS
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#include <openssl/dsa.h>
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int DSA_sign(int type, const unsigned char *dgst, int len,
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unsigned char *sigret, unsigned int *siglen, DSA *dsa);
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int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp);
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int DSA_verify(int type, const unsigned char *dgst, int len,
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unsigned char *sigbuf, int siglen, DSA *dsa);
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=head1 DESCRIPTION
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DSA_sign() computes a digital signature on the B<len> byte message
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digest B<dgst> using the private key B<dsa> and places its ASN.1 DER
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encoding at B<sigret>. The length of the signature is places in
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*B<siglen>. B<sigret> must point to DSA_size(B<dsa>) bytes of memory.
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DSA_sign_setup() is defined only for backward binary compatibility and
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should not be used.
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Since OpenSSL 1.1.0 the DSA type is opaque and the output of
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DSA_sign_setup() cannot be used anyway: calling this function will only
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cause overhead, and does not affect the actual signature
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(pre-)computation.
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DSA_verify() verifies that the signature B<sigbuf> of size B<siglen>
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matches a given message digest B<dgst> of size B<len>.
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B<dsa> is the signer's public key.
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The B<type> parameter is ignored.
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The random generator must be seeded when DSA_sign() (or DSA_sign_setup())
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is called.
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If the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to
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external circumstances (see L<RAND(7)>), the operation will fail.
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=head1 RETURN VALUES
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DSA_sign() and DSA_sign_setup() return 1 on success, 0 on error.
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DSA_verify() returns 1 for a valid signature, 0 for an incorrect
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signature and -1 on error. The error codes can be obtained by
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L<ERR_get_error(3)>.
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=head1 CONFORMING TO
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US Federal Information Processing Standard FIPS 186 (Digital Signature
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Standard, DSS), ANSI X9.30
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=head1 SEE ALSO
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L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>,
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L<DSA_do_sign(3)>,
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L<RAND(7)>
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=head1 COPYRIGHT
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Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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