DSA_SIGN - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEDSA_sign, DSA_sign_setup, DSA_verify − DSA signatures
SYNOPSIS​ #include <openssl/dsa.h> ​ ​ int DSA_sign(int type, const unsigned char *dgst, int len, ​ unsigned char *sigret, unsigned int *siglen, DSA *dsa); ​ ​ int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp); ​ ​ int DSA_verify(int type, const unsigned char *dgst, int len, ​ unsigned char *sigbuf, int siglen, DSA *dsa);
DESCRIPTION​DSA_sign() computes a digital signature on the len byte message digest dgst using the private key dsa and places its ASN.1 DER encoding at sigret. The length of the signature is places in *siglen. sigret must point to DSA_size(dsa) bytes of memory. ​DSA_sign_setup() is defined only for backward binary compatibility and should not be used. Since OpenSSL 1.1.0 the DSA type is opaque and the output of ​DSA_sign_setup() cannot be used anyway: calling this function will only cause overhead, and does not affect the actual signature (pre−)computation. ​DSA_verify() verifies that the signature sigbuf of size siglen matches a given message digest dgst of size len. ​dsa is the signer's public key. The type parameter is ignored. The random generator must be seeded when DSA_sign() (or DSA_sign_setup()) is called. If the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to external circumstances (see RAND (7)), the operation will fail.
RETURN VALUES​DSA_sign() and DSA_sign_setup() return 1 on success, 0 on error. ​DSA_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).
CONFORMING TO​US Federal Information Processing Standard FIPS 186 (Digital Signature Standard, DSS), ANSI X9.30
SEE ALSO​DSA_new (3), ERR_get_error (3), RAND_bytes (3), ​DSA_do_sign (3), ​RAND (7)
COPYRIGHTCopyright 2000−2019 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>. 0
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