NAME    [Toc]    [Back]

       DSA_do_sign, DSA_do_verify - Raw DSA signature operations

SYNOPSIS    [Toc]    [Back]

       #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    [Toc]    [Back]

       The DSA_do_sign() function computes a digital signature on
       the len byte message digest dgst using the private key dsa
       and returns it in a newly allocated DSA_SIG structure.

       The  DSA_sign_setup()  function  can be used to precompute
       part of the signing operation in case signature generation
       is time-critical.

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

RETURN VALUES    [Toc]    [Back]

       The  DSA_do_sign() function returns the signature, NULL on
       error.  The DSA_do_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().

HISTORY    [Toc]    [Back]

       The DSA_do_sign() and DSA_do_verify() functions were added
       in OpenSSL 0.9.3.

SEE ALSO    [Toc]    [Back]

       Functions:   dsa(3),   err(3),   rand(3),  DSA_SIG_new(3),
       DSA_sign(3)



                                                   DSA_do_sign(3)