5 DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures
9 #include <openssl/dsa.h>
11 int DSA_sign(int type, const unsigned char *dgst, int len,
12 unsigned char *sigret, unsigned int *siglen, DSA *dsa);
14 int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp);
16 int DSA_verify(int type, const unsigned char *dgst, int len,
17 unsigned char *sigbuf, int siglen, DSA *dsa);
21 DSA_sign() computes a digital signature on the B<len> byte message
22 digest B<dgst> using the private key B<dsa> and places its ASN.1 DER
23 encoding at B<sigret>. The length of the signature is places in
24 *B<siglen>. B<sigret> must point to DSA_size(B<dsa>) bytes of memory.
26 DSA_sign_setup() is defined only for backward binary compatibility and
28 Since OpenSSL 1.1.0 the DSA type is opaque and the output of
29 DSA_sign_setup() cannot be used anyway: calling this function will only
30 cause overhead, and does not affect the actual signature
33 DSA_verify() verifies that the signature B<sigbuf> of size B<siglen>
34 matches a given message digest B<dgst> of size B<len>.
35 B<dsa> is the signer's public key.
37 The B<type> parameter is ignored.
39 The PRNG must be seeded before DSA_sign() (or DSA_sign_setup())
44 DSA_sign() and DSA_sign_setup() return 1 on success, 0 on error.
45 DSA_verify() returns 1 for a valid signature, 0 for an incorrect
46 signature and -1 on error. The error codes can be obtained by
51 US Federal Information Processing Standard FIPS 186 (Digital Signature
52 Standard, DSS), ANSI X9.30
56 L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>,
61 Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
63 Licensed under the OpenSSL license (the "License"). You may not use
64 this file except in compliance with the License. You can obtain a copy
65 in the file LICENSE in the source distribution or at
66 L<https://www.openssl.org/source/license.html>.