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RedHat 9 (Linux i386) - man page for dsa_do_verify (redhat section 3)

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DSA_do_sign(3)				     OpenSSL				   DSA_do_sign(3)

       DSA_do_sign, DSA_do_verify - raw DSA signature operations

	#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);

       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 allocated DSA_SIG structure.

       DSA_sign_setup(3) may be used to precompute part of the signing operation in case signa-
       ture 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.

       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).

       dsa(3), ERR_get_error(3), rand(3), DSA_SIG_new(3), DSA_sign(3)

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

0.9.7a					    2002-09-25				   DSA_do_sign(3)
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