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OpenDarwin 7.2.1 - man page for dsa_sign (opendarwin section 3)

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DSA_sign(3)				     OpenSSL				      DSA_sign(3)

       DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures

	#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);

       DSA_sign() computes a digital signature on the len byte message digest dgst using the pri-
       vate 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() may be used to precompute part of the signing operation in case signature
       generation is time-critical. It expects dsa to contain DSA parameters. It places the pre-
       computed values in newly allocated BIGNUMs at *kinvp and *rp, after freeing the old ones
       unless *kinvp and *rp are NULL. These values may be passed to DSA_sign() in dsa->kinv and
       dsa->r.	ctx is a pre-allocated BN_CTX or NULL.

       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.

       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).

       US Federal Information Processing Standard FIPS 186 (Digital Signature Standard, DSS),
       ANSI X9.30

       dsa(3), ERR_get_error(3), rand(3), DSA_do_sign(3)

       DSA_sign() and DSA_verify() are available in all versions of SSLeay.  DSA_sign_setup() was
       added in SSLeay 0.8.

0.9.7d					    2003-11-20				      DSA_sign(3)
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