Package org.bouncycastle.pqc.crypto.rainbow

Class 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 (https://dx.doi.org/10.1007/11496137_12)

    • Constructor Summary

      Constructors 
      Constructor Description
      RainbowSigner()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method 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.