DSAdosign(3) OpenSSL DSAdosign(3)

NAME
       DSAdosign, DSAdoverify - raw DSA signature operations

SYNOPSIS
        #include 

        DSASIG *DSAdosign(const unsigned char *dgst, int dlen, DSA *dsa);

        int DSAdoverify(const unsigned char *dgst, int dgstlen,
                    DSASIG *sig, DSA *dsa);

DESCRIPTION
       DSAdosign() computes a digital signature on the lleenn byte message
       digest ddggsstt using the private key ddssaa and returns it in a newly
       allocated DDSSAASSIIGG structure.

       DSAsignsetup(3) may be used to precompute part of the signing
       operation in case signature generation is time-critical.

       DSAdoverify() verifies that the signature ssiigg matches a given message
       digest ddggsstt of size lleenn.  ddssaa is the signer's public key.

RETURN VALUES
       DSAdosign() returns the signature, NULL on error.  DSAdoverify()
       returns 1 for a valid signature, 0 for an incorrect signature and -1 on
       error. The error codes can be obtained by ERRgeterror(3).

SEE ALSO
       dsa(3), ERRgeterror(3), rand(3), DSASIGnew(3), DSAsign(3)

HISTORY       DSAdosign() and DSAdoverify() were added in OpenSSL 0.9.3.



0.9.7l                            2002-09-25                    DSAdosign(3)