DSA_DO_SIGN - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEDSA_do_sign, DSA_do_verify − raw DSA signature operations
SYNOPSIS​ #include <openssl/dsa.h> ​ ​ DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); ​ ​ int DSA_do_verify(const unsigned char *dgst, int dgst_len, ​ DSA_SIG *sig, DSA *dsa);
DESCRIPTION​DSA_do_sign() computes a digital signature on the len byte message digest dgst using the private key dsa and returns it in a newly allocated DSA_SIG structure. ​DSA_sign_setup (3) may be used to precompute part of the signing operation in case signature generation is time-critical. ​DSA_do_verify() verifies that the signature sig matches a given message digest dgst of size len. dsa is the signer's public key.
RETURN VALUES​DSA_do_sign() returns the signature, NULL on error. DSA_do_verify() returns 1 for a valid signature, 0 for an incorrect signature and −1 on error. The error codes can be obtained by ​ERR_get_error (3).
SEE ALSO​DSA_new (3), ERR_get_error (3), RAND_bytes (3), ​DSA_SIG_new (3), ​DSA_sign (3)
COPYRIGHTCopyright 2000−2016 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 <https://www.openssl.org/source/license.html>. 0
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