bionic (3) DSA_do_sign.3ssl.gz

Provided by: libssl-doc_1.1.1-1ubuntu2.1~18.04.23_all bug

NAME
       DSA_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)


       Copyright 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>.