org.spongycastle.crypto.signers

Class DSTU4145Signer

java.lang.Object

org.spongycastle.crypto.signers.DSTU4145Signer

All Implemented Interfaces:

DSA

public class DSTU4145Signer
extends java.lang.Object
implements DSA

DSTU 4145-2002

National Ukrainian standard of digital signature based on elliptic curves (DSTU 4145-2002).

Constructor Summary

Constructors

Constructor and Description
DSTU4145Signer()

Method Summary

Modifier and Type	Method and Description
protected ECMultiplier	createBasePointMultiplier()
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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DSTU4145Signer

public DSTU4145Signer()

Method Detail

init

public void init(boolean forSigning,
                 CipherParameters param)

Description copied from interface: DSA

initialise the signer for signature generation or signature verification.

Specified by:

init in interface DSA

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)

Description copied from interface: DSA

sign the passed in message (usually the output of a hash function).

Specified by:

generateSignature in interface DSA

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)

Description copied from interface: DSA

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

Specified by:

verifySignature in interface DSA

Parameters:

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

r - the r signature value.

s - the s signature value.

createBasePointMultiplier

protected ECMultiplier createBasePointMultiplier()