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DSA_SIGN(3)			    OpenSSL			   DSA_SIGN(3)

NAME
       DSA_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 PRNG	must be	seeded before DSA_sign() (or DSA_sign_setup()) is
       called.

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)

COPYRIGHT
       Copyright 2000-2018 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>.

1.1.1a				  2018-11-20			   DSA_SIGN(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | CONFORMING TO | SEE ALSO | COPYRIGHT

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