1DSA_DO_SIGN(3)                      OpenSSL                     DSA_DO_SIGN(3)
2
3
4

NAME

6       DSA_do_sign, DSA_do_verify - raw DSA signature operations
7

SYNOPSIS

9        #include <openssl/dsa.h>
10
11        DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
12
13        int DSA_do_verify(const unsigned char *dgst, int dgst_len,
14                          DSA_SIG *sig, DSA *dsa);
15

DESCRIPTION

17       DSA_do_sign() computes a digital signature on the len byte message
18       digest dgst using the private key dsa and returns it in a newly
19       allocated DSA_SIG structure.
20
21       DSA_sign_setup(3) may be used to precompute part of the signing
22       operation in case signature generation is time-critical.
23
24       DSA_do_verify() verifies that the signature sig matches a given message
25       digest dgst of size len.  dsa is the signer's public key.
26

RETURN VALUES

28       DSA_do_sign() returns the signature, NULL on error.  DSA_do_verify()
29       returns 1 for a valid signature, 0 for an incorrect signature and -1 on
30       error. The error codes can be obtained by ERR_get_error(3).
31

SEE ALSO

33       DSA_new(3), ERR_get_error(3), RAND_bytes(3), DSA_SIG_new(3),
34       DSA_sign(3)
35

37       Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
38
39       Licensed under the OpenSSL license (the "License").  You may not use
40       this file except in compliance with the License.  You can obtain a copy
41       in the file LICENSE in the source distribution or at
42       <https://www.openssl.org/source/license.html>.
43
44
45
461.1.1q                            2022-07-07                    DSA_DO_SIGN(3)
Impressum