kz.gamma.crypto
Interface DSA

All Known Implementing Classes:

ECGOST3410Signer

public interface DSA

interface for classes implementing algorithms modeled similar to the Digital Signature Alorithm.

Method Summary

byte[]	generateSignature(byte[] message) sign the passed in message (usually the output of a hash function).
void	init(boolean forSigning, CipherParameters param) initialise the signer for signature generation or signature verification.
boolean	verifySignature(byte[] message, byte[] sign) verify the message message against the signature values r and s.

Method Detail

init

void init(boolean forSigning,
          CipherParameters param)

initialise the signer for signature generation or signature verification.

Parameters:

forSigning - true if we are generating a signature, false otherwise.

param - key parameters for signature generation.

generateSignature

byte[] generateSignature(byte[] message)
                         throws CSPException

sign the passed in message (usually the output of a hash function).

Parameters:

message - The message to be signed.

Returns:

two Big integers representing the r and s values respectively.

Throws:

CSPException

verifySignature

boolean verifySignature(byte[] message,
                        byte[] sign)
                        throws CSPException

verify the message message against the signature values r and s.

Parameters:

message - The message that was supposed to have been signed.

sign - Signature

Returns:

true, если подпись верна, иначе false

Throws:

CSPException