72 lines
2.2 KiB
Plaintext
72 lines
2.2 KiB
Plaintext
|
=pod
|
||
|
|
|
||
|
|
=head1 NAME
|
||
|
|
|
||
|
|
DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures
|
||
|
|
|
||
|
|
=head1 SYNOPSIS
|
||
|
|
|
||
|
|
#include <openssl/dsa.h>
|
||
|
|
|
||
|
|
int DSA_sign(int type, const unsigned char *dgst, int len,
|
||
|
|
unsigned char *sigret, unsigned int *siglen, DSA *dsa);
|
||
|
|
|
||
|
|
int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp);
|
||
|
|
|
||
|
|
int DSA_verify(int type, const unsigned char *dgst, int len,
|
||
|
|
unsigned char *sigbuf, int siglen, DSA *dsa);
|
||
|
|
|
||
|
|
=head1 DESCRIPTION
|
||
|
|
|
||
|
|
DSA_sign() computes a digital signature on the B<len> byte message
|
||
|
|
digest B<dgst> using the private key B<dsa> and places its ASN.1 DER
|
||
|
|
encoding at B<sigret>. The length of the signature is places in
|
||
|
|
*B<siglen>. B<sigret> must point to DSA_size(B<dsa>) bytes of memory.
|
||
|
|
|
||
|
|
DSA_sign_setup() is defined only for backward binary compatibility and
|
||
|
|
should not be used.
|
||
|
|
Since OpenSSL 1.1.0 the DSA type is opaque and the output of
|
||
|
|
DSA_sign_setup() cannot be used anyway: calling this function will only
|
||
|
|
cause overhead, and does not affect the actual signature
|
||
|
|
(pre-)computation.
|
||
|
|
|
||
|
|
DSA_verify() verifies that the signature B<sigbuf> of size B<siglen>
|
||
|
|
matches a given message digest B<dgst> of size B<len>.
|
||
|
|
B<dsa> is the signer's public key.
|
||
|
|
|
||
|
|
The B<type> parameter is ignored.
|
||
|
|
|
||
|
|
The random generator must be seeded when DSA_sign() (or DSA_sign_setup())
|
||
|
|
is called.
|
||
|
|
If the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to
|
||
|
|
external circumstances (see L<RAND(7)>), the operation will fail.
|
||
|
|
|
||
|
|
=head1 RETURN VALUES
|
||
|
|
|
||
|
|
DSA_sign() and DSA_sign_setup() return 1 on success, 0 on error.
|
||
|
|
DSA_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 CONFORMING TO
|
||
|
|
|
||
|
|
US Federal Information Processing Standard FIPS 186 (Digital Signature
|
||
|
|
Standard, DSS), ANSI X9.30
|
||
|
|
|
||
|
|
=head1 SEE ALSO
|
||
|
|
|
||
|
|
L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>,
|
||
|
|
L<DSA_do_sign(3)>,
|
||
|
|
L<RAND(7)>
|
||
|
|
|
||
|
|
=head1 COPYRIGHT
|
||
|
|
|
||
|
|
Copyright 2000-2019 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
|