org.bouncycastle.crypto

Interface DSA

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

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, BigInteger r, BigInteger s)
verify the message message against the signature values r and s.

Method Details

generateSignature

public 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.

init

public 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.

verifySignature

public boolean verifySignature(byte[] message,
                               BigInteger r,
                               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.