1=pod 2 3=head1 NAME 4 5DSA_do_sign, DSA_do_verify - raw DSA signature operations 6 7=head1 SYNOPSIS 8 9 #include <openssl/dsa.h> 10 11 DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); 12 13 int DSA_do_verify(const unsigned char *dgst, int dgst_len, 14 DSA_SIG *sig, DSA *dsa); 15 16=head1 DESCRIPTION 17 18DSA_do_sign() computes a digital signature on the B<len> byte message 19digest B<dgst> using the private key B<dsa> and returns it in a 20newly allocated B<DSA_SIG> structure. 21 22L<DSA_sign_setup(3)|DSA_sign_setup(3)> may be used to precompute part 23of the signing operation in case signature generation is 24time-critical. 25 26DSA_do_verify() verifies that the signature B<sig> matches a given 27message digest B<dgst> of size B<len>. B<dsa> is the signer's public 28key. 29 30=head1 RETURN VALUES 31 32DSA_do_sign() returns the signature, NULL on error. DSA_do_verify() 33returns 1 for a valid signature, 0 for an incorrect signature and -1 34on error. The error codes can be obtained by 35L<ERR_get_error(3)|ERR_get_error(3)>. 36 37=head1 SEE ALSO 38 39L<dsa(3)|dsa(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>, 40L<DSA_SIG_new(3)|DSA_SIG_new(3)>, 41L<DSA_sign(3)|DSA_sign(3)> 42 43=head1 HISTORY 44 45DSA_do_sign() and DSA_do_verify() were added in OpenSSL 0.9.3. 46 47=cut 48