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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);

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 allo‐
       cated DSA_SIG structure.

       DSA_sign_setup(3) may be used to precompute part of the signing opera‐
       tion 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(3), ERR_get_error(3), rand(3), DSA_SIG_new(3), DSA_sign(3)

HISTORY
       DSA_do_sign() and DSA_do_verify() were added in OpenSSL 0.9.3.

0.9.8k				  2009-05-20			DSA_do_sign(3)

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