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DSA_do_sign

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

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.


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