org.spongycastle.pqc.crypto.rainbow

Class RainbowSigner

java.lang.Object

org.spongycastle.pqc.crypto.rainbow.RainbowSigner

All Implemented Interfaces:

MessageSigner

public class RainbowSigner
extends java.lang.Object
implements MessageSigner

It implements the sign and verify functions for the Rainbow Signature Scheme. Here the message, which has to be signed, is updated. The use of different hash functions is possible.

Detailed information about the signature and the verify-method is to be found in the paper of Jintai Ding, Dieter Schmidt: Rainbow, a New Multivariable Polynomial Signature Scheme. ACNS 2005: 164-175 (http://dx.doi.org/10.1007/11496137_12)

Constructor Summary

Constructors

Constructor and Description
RainbowSigner()

Method Summary

Modifier and Type	Method and Description
byte[]	generateSignature(byte[] message) This function signs the message that has been updated, making use of the private key.
void	init(boolean forSigning, CipherParameters param) initialise the signer for signature generation or signature verification.
boolean	verifySignature(byte[] message, byte[] signature) This function verifies the signature of the message that has been updated, with the aid of the public key.

Methods inherited from class java.lang.Object

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

Constructor Detail

RainbowSigner

public RainbowSigner()

Method Detail

init

public void init(boolean forSigning,
                 CipherParameters param)

Description copied from interface: MessageSigner

initialise the signer for signature generation or signature verification.

Specified by:

init in interface MessageSigner

Parameters:

forSigning - true if we are generating a signature, false otherwise.

param - key parameters for signature generation.

generateSignature

public byte[] generateSignature(byte[] message)

This function signs the message that has been updated, making use of the private key.

For computing the signature, L1 and L2 are needed, as well as LES should be solved for each layer in order to find the Oil-variables in the layer.

The Vinegar-variables of the first layer are random generated.

Specified by:

generateSignature in interface MessageSigner

Parameters:

message - the message

Returns:

the signature of the message.

verifySignature

public boolean verifySignature(byte[] message,
                               byte[] signature)

This function verifies the signature of the message that has been updated, with the aid of the public key.

Specified by:

verifySignature in interface MessageSigner

Parameters:

message - the message

signature - the signature of the message

Returns:

true if the signature has been verified, false otherwise.