DSA_sign man page on DigitalUNIX

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DSA_sign(3)							   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
	       int  type,  const  unsigned  char *dgst, int len, unsigned char
       *sigbuf, int siglen, DSA *dsa );

       The DSA_sign() function 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  placed  in
       *siglen. The sigret must point to DSA_size(dsa) bytes of memory.

       The  DSA_sign_setup()  function	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 precomputed 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. The ctx is a	 pre-allocated	BN_CTX
       or NULL.

       The  DSA_verify()  function  verifies that the signature sigbuf of size
       siglen matches a given message digest dgst of size len. The dsa is  the
       signer's public key.

       The type parameter is ignored.

       The PRNG must be seeded before the DSA_sign() or DSA_sign_setup() func‐
       tion is called.

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

       The DSA_sign() and DSA_sign_setup() functions return 1 on success, 0 on
       error. The DSA_verify() function returns 1 for a valid signature, 0 for
       an  incorrect  signature,  and  -1  on  error.  The  error codes can be
       obtained from ERR_get_error().

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

       Functions: dsa(3), err(3), rand(3), DSA_do_sign(3)


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