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Bouncy Castle Cryptography 1.11 API Specification: Interface DSA

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Bouncy Castle Cryptography 1.11

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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.