Bouncy Castle Cryptography 1.11 API Specification: Interface DSA
Bouncy Castle Cryptography 1.11

org.bouncycastle.crypto
Interface DSA

All Known Implementing Classes:
ECDSASigner, DSASigner

public interface DSA

interface for classes implementing the Digital Signature Algorithm


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

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.

generateSignature

public 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

public 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 1.11