DSA_do_sign.3ssl - Man Page
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>.
Referenced By
DSA_get0_pqg.3ssl(3), DSA_meth_new.3ssl(3), DSA_sign.3ssl(3), DSA_SIG_new.3ssl(3).
The man page DSA_do_verify.3ssl(3) is an alias of DSA_do_sign.3ssl(3).