Bouncy Castle Cryptography Library 1.37

org.bouncycastle.crypto
Interface DSA

All Known Implementing Classes:
DSASigner, ECDSASigner, ECGOST3410Signer, ECNRSigner, GOST3410Signer

public interface DSA

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


Method Summary
 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.

Bouncy Castle Cryptography Library 1.37