DSA_do_sign.pod 1.2 KB

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  1. =pod
  2. =head1 NAME
  3. DSA_do_sign, DSA_do_verify - raw DSA signature operations
  4. =head1 SYNOPSIS
  5. #include <openssl/dsa.h>
  6. DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
  7. int DSA_do_verify(const unsigned char *dgst, int dgst_len,
  8. DSA_SIG *sig, DSA *dsa);
  9. =head1 DESCRIPTION
  10. DSA_do_sign() computes a digital signature on the B<len> byte message
  11. digest B<dgst> using the private key B<dsa> and returns it in a
  12. newly allocated B<DSA_SIG> structure.
  13. L<DSA_sign_setup(3)|DSA_sign_setup(3)> may be used to precompute part
  14. of the signing operation in case signature generation is
  15. time-critical.
  16. DSA_do_verify() verifies that the signature B<sig> matches a given
  17. message digest B<dgst> of size B<len>. B<dsa> is the signer's public
  18. key.
  19. =head1 RETURN VALUES
  20. DSA_do_sign() returns the signature, NULL on error. DSA_do_verify()
  21. returns 1 for a valid signature, 0 for an incorrect signature and -1
  22. on error. The error codes can be obtained by
  23. L<ERR_get_error(3)|ERR_get_error(3)>.
  24. =head1 SEE ALSO
  25. L<dsa(3)|dsa(3)>, L<err(3)|err(3)>, L<rand(3)|rand(3)>,
  26. L<DSA_SIG_new(3)|DSA_SIG_new(3)>,
  27. L<DSA_sign(3)|DSA_sign(3)>
  28. =head1 HISTORY
  29. DSA_do_sign() and DSA_do_verify() were added in OpenSSL 0.9.3.
  30. =cut