Index for Section 3

Alphabetical listing for D

Bottom of page

DSA_do_sign(3)
NAME
  DSA_do_sign, DSA_do_verify - Raw DSA signature operations

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

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

Index for Section 3

Alphabetical listing for D

Top of page