DSA_do_sign(3) OpenSSL DSA_do_sign(3)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);
DESCRIPTIONDSA_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 VALUESDSA_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 ALSOdsa(3), ERR_get_error(3), rand(3), DSA_SIG_new(3),
DSA_sign(3)HISTORYDSA_do_sign() and DSA_do_verify() were added in OpenSSL
0.9.3.
25/Sep/2002 0.9.6j DSA_do_sign(3)