de.flexiprovider.pqc.rainbow
Class RainbowKeyPairGenerator

java.lang.Object
  |
  +--java.security.KeyPairGeneratorSpi
        |
        +--de.flexiprovider.api.keys.KeyPairGenerator
              |
              +--de.flexiprovider.pqc.rainbow.RainbowKeyPairGenerator

public class RainbowKeyPairGenerator

extends KeyPairGenerator

This class extends the KeyPairGenerator in the FlexiProvider_API. It is used as a generator for the private and public key of the Rainbow Signature Scheme. Detailed information about the key generation 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)

Author:

Patrick Neugebauer, Marius Senftleben, Tsvetoslava Vateva

Constructor Summary

RainbowKeyPairGenerator()

Method Summary

void	compactPublicKey(short[][][] coeff_quadratic_to_compact) The quadratic (or mixed) terms of the public key are compacted from a n x n matrix per polynomial to an upper diagonal matrix stored in one integer array of n (n + 1) / 2 elements per polynomial.
void	computePublicKey() This function computes the public key from the private key.
KeyPair	genKeyPair() This function generates a Rainbow key pair, consisting of a RainbowPublicKey and a RainbowPrivateKey.
void	initialize(AlgorithmParameterSpec params, SecureRandom random) This function is used for initialization of the RainbowKeyPairGenerator making use of RanbowParameterSpec.
void	initialize(int keysize, SecureRandom random) This function initializes the key pair generator with the given key size.

Methods inherited from class de.flexiprovider.api.keys.KeyPairGenerator

generateKeyPair, initialize, initialize

Methods inherited from class java.lang.Object

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

Constructor Detail

RainbowKeyPairGenerator

public RainbowKeyPairGenerator()

Method Detail

genKeyPair

public KeyPair genKeyPair()

This function generates a Rainbow key pair, consisting of a RainbowPublicKey and a RainbowPrivateKey.

Overrides:

genKeyPair in class KeyPairGenerator

Returns:

the generated key pair

initialize

public void initialize(AlgorithmParameterSpec params,
                       SecureRandom random)
                throws InvalidAlgorithmParameterException

This function is used for initialization of the RainbowKeyPairGenerator making use of RanbowParameterSpec.

Overrides:

initialize in class KeyPairGenerator

Parameters:

params -

random - source of randomness

initialize

public void initialize(int keysize,
                       SecureRandom random)
                throws InvalidParameterException

This function initializes the key pair generator with the given key size.

Overrides:

initialize in class KeyPairGenerator

Parameters:

keySize -

random - the source of randomness

computePublicKey

public void computePublicKey()

This function computes the public key from the private key. The composition of F with L2 is computed, followed by applying L1 to the composition's result. The singular and scalar values constitute to the public key as is, the quadratic terms are compacted in compactPublicKey()

compactPublicKey

public void compactPublicKey(short[][][] coeff_quadratic_to_compact)

The quadratic (or mixed) terms of the public key are compacted from a n x n matrix per polynomial to an upper diagonal matrix stored in one integer array of n (n + 1) / 2 elements per polynomial. The ordering of elements is lexicographic and the result is updating this.pub_quadratic, which stores the quadratic elements of the public key.

Parameters:

coeff_quadratic_to_compact - 3-dimensional array containing a n x n Matrix for each of the n - v1 polynomials