org.spongycastle.crypto.signers

Class ECGOST3410_2012Signer

java.lang.Object

org.spongycastle.crypto.signers.ECGOST3410_2012Signer

All Implemented Interfaces:

DSA

public class ECGOST3410_2012Signer
extends java.lang.Object
implements DSA

GOST R 34.10-2012 Signature Algorithm

Constructor Summary

Constructors

Constructor and Description
ECGOST3410_2012Signer()

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 2012 signature for the passed in message (for standard GOST3410 2012 the message should be a GOST3411 2012 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

ECGOST3410_2012Signer

public ECGOST3410_2012Signer()

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 2012 the message should be a GOST3411 2012 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 2012 signature for the passed in message (for standard GOST3410 2012 the message should be a GOST3411 2012 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()