DSA_do_sign(3)
- NetBSD Manual Pages
DSA_do_sign(3) OpenSSL DSA_do_sign(3)
NAME
DSA_do_sign, DSA_do_verify - raw DSA signature operations
LIBRARY
libcrypto, -lcrypto
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
openssl_dsa(3), ERR_get_error(3), openssl_rand(3), DSA_SIG_new(3),
DSA_sign(3)
HISTORY
DSA_do_sign() and DSA_do_verify() were added in OpenSSL 0.9.3.
1.0.1p 2009-07-19 DSA_do_sign(3)
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