org.spongycastle.crypto

Interface DSA

All Known Implementing Classes:

DSASigner, DSTU4145Signer, ECDSASigner, ECGOST3410_2012Signer, ECGOST3410Signer, ECNRSigner, GOST3410Signer, SM2Signer

public interface DSA

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

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger[]	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, java.math.BigInteger r, java.math.BigInteger s) 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

java.math.BigInteger[] generateSignature(byte[] message)

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.

verifySignature

boolean verifySignature(byte[] message,
                        java.math.BigInteger r,
                        java.math.BigInteger s)

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

Parameters:

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

r - the r signature value.

s - the s signature value.