org.spongycastle.crypto.signers

Class ECGOST3410Signer

java.lang.Object

org.spongycastle.crypto.signers.ECGOST3410Signer

All Implemented Interfaces:

DSA

public class ECGOST3410Signer
extends java.lang.Object
implements DSA

GOST R 34.10-2001 Signature Algorithm

Constructor Summary

Constructors

Constructor and Description
ECGOST3410Signer()

Method Summary

Modifier and Type	Method and Description
protected ECMultiplier	createBasePointMultiplier()
java.math.BigInteger[]	generateSignature(byte[] message) generate a signature for the given message using the key we were initialised with.
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) return true if the value r and s represent a GOST3410 signature for the passed in message (for standard GOST3410 the message should be a GOST3411 hash of the real message to be verified).

Methods inherited from class java.lang.Object

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

Constructor Detail

ECGOST3410Signer

public ECGOST3410Signer()

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)

generate a signature for the given message using the key we were initialised with. For conventional GOST3410 the message should be a GOST3411 hash of the message of interest.

Specified by:

generateSignature in interface DSA

Parameters:

message - the message that will be verified later.

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)

return true if the value r and s represent a GOST3410 signature for the passed in message (for standard GOST3410 the message should be a GOST3411 hash of the real message to be verified).

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()