Bouncy Castle Cryptography Library 1.48

org.bouncycastle.pqc.crypto.rainbow
Class RainbowSigner

java.lang.Object
  extended by org.bouncycastle.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
RainbowSigner()
           
 
Method Summary
 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.

Bouncy Castle Cryptography Library 1.48