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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.pqc.crypto.util;
import java.io.IOException;
import java.security.SecureRandom;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.EncapsulatedSecretExtractor;
import org.bouncycastle.crypto.EncapsulatedSecretGenerator;
import org.bouncycastle.crypto.KeyGenerationParameters;
import org.bouncycastle.crypto.SecretWithEncapsulation;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.util.DEROtherInfo;
import org.bouncycastle.pqc.asn1.PQCObjectIdentifiers;
import org.bouncycastle.pqc.crypto.ExchangePair;
import org.bouncycastle.pqc.crypto.KEMParameters;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberKEMExtractor;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberKEMGenerator;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberKeyGenerationParameters;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberKeyPairGenerator;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberParameters;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.newhope.NHAgreement;
import org.bouncycastle.pqc.crypto.newhope.NHExchangePairGenerator;
import org.bouncycastle.pqc.crypto.newhope.NHKeyPairGenerator;
import org.bouncycastle.pqc.crypto.newhope.NHPublicKeyParameters;
import org.bouncycastle.pqc.crypto.ntru.NTRUKEMExtractor;
import org.bouncycastle.pqc.crypto.ntru.NTRUKEMGenerator;
import org.bouncycastle.pqc.crypto.ntru.NTRUKeyGenerationParameters;
import org.bouncycastle.pqc.crypto.ntru.NTRUKeyPairGenerator;
import org.bouncycastle.pqc.crypto.ntru.NTRUParameters;
import org.bouncycastle.pqc.crypto.ntru.NTRUPrivateKeyParameters;
/**
* OtherInfo Generator for which can be used for populating the SuppPrivInfo field used to provide shared
* secret data used with NIST SP 800-56A agreement algorithms.
*/
public class PQCOtherInfoGenerator
{
protected final DEROtherInfo.Builder otherInfoBuilder;
protected final SecureRandom random;
protected boolean used = false;
/**
* Create a basic builder with just the compulsory fields.
*
* @param algorithmID the algorithm associated with this invocation of the KDF.
* @param partyUInfo sender party info.
* @param partyVInfo receiver party info.
* @param random a source of randomness.
*/
public PQCOtherInfoGenerator(AlgorithmIdentifier algorithmID, byte[] partyUInfo, byte[] partyVInfo, SecureRandom random)
{
this.otherInfoBuilder = new DEROtherInfo.Builder(algorithmID, partyUInfo, partyVInfo);
this.random = random;
}
/**
* Party U (initiator) generation.
*/
public static class PartyU
extends PQCOtherInfoGenerator
{
private AsymmetricCipherKeyPair aKp;
private EncapsulatedSecretExtractor encSE;
/**
* Create a basic builder with just the compulsory fields for the initiator.
*
* @param kemParams the key type parameters for populating the private info field.
* @param algorithmID the algorithm associated with this invocation of the KDF.
* @param partyUInfo sender party info.
* @param partyVInfo receiver party info.
* @param random a source of randomness.
*/
public PartyU(KEMParameters kemParams, AlgorithmIdentifier algorithmID, byte[] partyUInfo, byte[] partyVInfo, SecureRandom random)
{
super(algorithmID, partyUInfo, partyVInfo, random);
if (kemParams instanceof KyberParameters)
{
KyberKeyPairGenerator kPg = new KyberKeyPairGenerator();
kPg.init(new KyberKeyGenerationParameters(random, (KyberParameters)kemParams));
aKp = kPg.generateKeyPair();
encSE = new KyberKEMExtractor((KyberPrivateKeyParameters)aKp.getPrivate());
}
else if (kemParams instanceof NTRUParameters)
{
NTRUKeyPairGenerator kPg = new NTRUKeyPairGenerator();
kPg.init(new NTRUKeyGenerationParameters(random, (NTRUParameters)kemParams));
aKp = kPg.generateKeyPair();
encSE = new NTRUKEMExtractor((NTRUPrivateKeyParameters)aKp.getPrivate());
}
else
{
throw new IllegalArgumentException("unknown KEMParameters");
}
}
/**
* Add optional supplementary public info (DER tagged, implicit, 0).
*
* @param suppPubInfo supplementary public info.
* @return the current builder instance.
*/
public PQCOtherInfoGenerator withSuppPubInfo(byte[] suppPubInfo)
{
this.otherInfoBuilder.withSuppPubInfo(suppPubInfo);
return this;
}
public byte[] getSuppPrivInfoPartA()
{
return getEncoded(aKp.getPublic());
}
public DEROtherInfo generate(byte[] suppPrivInfoPartB)
{
this.otherInfoBuilder.withSuppPrivInfo(encSE.extractSecret(suppPrivInfoPartB));
return otherInfoBuilder.build();
}
}
/**
* Party V (responder) generation.
*/
public static class PartyV
extends PQCOtherInfoGenerator
{
private EncapsulatedSecretGenerator encSG;
/**
* Create a basic builder with just the compulsory fields for the responder.
*
* @param kemParams the key type parameters for populating the private info field.
* @param algorithmID the algorithm associated with this invocation of the KDF.
* @param partyUInfo sender party info.
* @param partyVInfo receiver party info.
* @param random a source of randomness.
*/
public PartyV(KEMParameters kemParams, AlgorithmIdentifier algorithmID, byte[] partyUInfo, byte[] partyVInfo, SecureRandom random)
{
super(algorithmID, partyUInfo, partyVInfo, random);
if (kemParams instanceof KyberParameters)
{
encSG = new KyberKEMGenerator(random);
}
else if (kemParams instanceof NTRUParameters)
{
encSG = new NTRUKEMGenerator(random);
}
else
{
throw new IllegalArgumentException("unknown KEMParameters");
}
}
/**
* Add optional supplementary public info (DER tagged, implicit, 0).
*
* @param suppPubInfo supplementary public info.
* @return the current builder instance.
*/
public PQCOtherInfoGenerator withSuppPubInfo(byte[] suppPubInfo)
{
this.otherInfoBuilder.withSuppPubInfo(suppPubInfo);
return this;
}
public byte[] getSuppPrivInfoPartB(byte[] suppPrivInfoPartA)
{
used = false;
try
{
SecretWithEncapsulation bEp = encSG.generateEncapsulated(getPublicKey(suppPrivInfoPartA));
this.otherInfoBuilder.withSuppPrivInfo(bEp.getSecret());
return bEp.getEncapsulation();
}
catch (IOException e)
{
throw new IllegalArgumentException("cannot decode public key");
}
}
public DEROtherInfo generate()
{
if (used)
{
throw new IllegalStateException("builder already used");
}
used = true;
return otherInfoBuilder.build();
}
}
private static byte[] getEncoded(AsymmetricKeyParameter pubKey)
{
try
{
return SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(pubKey).getEncoded();
}
catch (IOException e)
{
return null;
}
}
private static AsymmetricKeyParameter getPublicKey(byte[] enc)
throws IOException
{
return PublicKeyFactory.createKey(enc);
}
}