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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 1.5 to JDK 1.8.
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package org.bouncycastle.jcajce.provider.asymmetric.ec;
import java.math.BigInteger;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import org.bouncycastle.asn1.x9.X9IntegerConverter;
import org.bouncycastle.crypto.BasicAgreement;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DerivationFunction;
import org.bouncycastle.crypto.agreement.ECDHBasicAgreement;
import org.bouncycastle.crypto.agreement.ECDHCBasicAgreement;
import org.bouncycastle.crypto.agreement.ECMQVBasicAgreement;
import org.bouncycastle.crypto.agreement.kdf.ConcatenationKDFGenerator;
import org.bouncycastle.crypto.generators.KDF2BytesGenerator;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.MQVPrivateParameters;
import org.bouncycastle.crypto.params.MQVPublicParameters;
import org.bouncycastle.crypto.util.DigestFactory;
import org.bouncycastle.jcajce.provider.asymmetric.util.BaseAgreementSpi;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jcajce.spec.MQVParameterSpec;
import org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec;
import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.interfaces.MQVPrivateKey;
import org.bouncycastle.jce.interfaces.MQVPublicKey;
/**
* Diffie-Hellman key agreement using elliptic curve keys, ala IEEE P1363
* both the simple one, and the simple one with cofactors are supported.
*
* Also, MQV key agreement per SEC-1
*/
public class KeyAgreementSpi
extends BaseAgreementSpi
{
private static final X9IntegerConverter converter = new X9IntegerConverter();
private String kaAlgorithm;
private ECDomainParameters parameters;
private BasicAgreement agreement;
private MQVParameterSpec mqvParameters;
private BigInteger result;
protected KeyAgreementSpi(
String kaAlgorithm,
BasicAgreement agreement,
DerivationFunction kdf)
{
super(kaAlgorithm, kdf);
this.kaAlgorithm = kaAlgorithm;
this.agreement = agreement;
}
protected byte[] bigIntToBytes(
BigInteger r)
{
return converter.integerToBytes(r, converter.getByteLength(parameters.getCurve()));
}
protected Key engineDoPhase(
Key key,
boolean lastPhase)
throws InvalidKeyException, IllegalStateException
{
if (parameters == null)
{
throw new IllegalStateException(kaAlgorithm + " not initialised.");
}
if (!lastPhase)
{
throw new IllegalStateException(kaAlgorithm + " can only be between two parties.");
}
CipherParameters pubKey;
if (agreement instanceof ECMQVBasicAgreement)
{
if (!(key instanceof MQVPublicKey))
{
ECPublicKeyParameters staticKey = (ECPublicKeyParameters)
ECUtils.generatePublicKeyParameter((PublicKey)key);
ECPublicKeyParameters ephemKey = (ECPublicKeyParameters)
ECUtils.generatePublicKeyParameter(mqvParameters.getOtherPartyEphemeralKey());
pubKey = new MQVPublicParameters(staticKey, ephemKey);
}
else
{
MQVPublicKey mqvPubKey = (MQVPublicKey)key;
ECPublicKeyParameters staticKey = (ECPublicKeyParameters)
ECUtils.generatePublicKeyParameter(mqvPubKey.getStaticKey());
ECPublicKeyParameters ephemKey = (ECPublicKeyParameters)
ECUtils.generatePublicKeyParameter(mqvPubKey.getEphemeralKey());
pubKey = new MQVPublicParameters(staticKey, ephemKey);
}
}
else
{
if (!(key instanceof PublicKey))
{
throw new InvalidKeyException(kaAlgorithm + " key agreement requires "
+ getSimpleName(ECPublicKey.class) + " for doPhase");
}
pubKey = ECUtils.generatePublicKeyParameter((PublicKey)key);
}
try
{
result = agreement.calculateAgreement(pubKey);
}
catch (final Exception e)
{
throw new InvalidKeyException("calculation failed: " + e.getMessage())
{
public Throwable getCause()
{
return e;
}
};
}
return null;
}
protected void engineInit(
Key key,
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
if (params != null && !(params instanceof MQVParameterSpec || params instanceof UserKeyingMaterialSpec))
{
throw new InvalidAlgorithmParameterException("No algorithm parameters supported");
}
initFromKey(key, params);
}
protected void engineInit(
Key key,
SecureRandom random)
throws InvalidKeyException
{
initFromKey(key, null);
}
private void initFromKey(Key key, AlgorithmParameterSpec parameterSpec)
throws InvalidKeyException
{
if (agreement instanceof ECMQVBasicAgreement)
{
mqvParameters = null;
if (!(key instanceof MQVPrivateKey) && !(parameterSpec instanceof MQVParameterSpec))
{
throw new InvalidKeyException(kaAlgorithm + " key agreement requires "
+ getSimpleName(MQVParameterSpec.class) + " for initialisation");
}
ECPrivateKeyParameters staticPrivKey;
ECPrivateKeyParameters ephemPrivKey;
ECPublicKeyParameters ephemPubKey;
if (key instanceof MQVPrivateKey)
{
MQVPrivateKey mqvPrivKey = (MQVPrivateKey)key;
staticPrivKey = (ECPrivateKeyParameters)
ECUtil.generatePrivateKeyParameter(mqvPrivKey.getStaticPrivateKey());
ephemPrivKey = (ECPrivateKeyParameters)
ECUtil.generatePrivateKeyParameter(mqvPrivKey.getEphemeralPrivateKey());
ephemPubKey = null;
if (mqvPrivKey.getEphemeralPublicKey() != null)
{
ephemPubKey = (ECPublicKeyParameters)
ECUtils.generatePublicKeyParameter(mqvPrivKey.getEphemeralPublicKey());
}
}
else
{
MQVParameterSpec mqvParameterSpec = (MQVParameterSpec)parameterSpec;
staticPrivKey = (ECPrivateKeyParameters)
ECUtil.generatePrivateKeyParameter((PrivateKey)key);
ephemPrivKey = (ECPrivateKeyParameters)
ECUtil.generatePrivateKeyParameter(mqvParameterSpec.getEphemeralPrivateKey());
ephemPubKey = null;
if (mqvParameterSpec.getEphemeralPublicKey() != null)
{
ephemPubKey = (ECPublicKeyParameters)
ECUtils.generatePublicKeyParameter(mqvParameterSpec.getEphemeralPublicKey());
}
mqvParameters = mqvParameterSpec;
ukmParameters = mqvParameterSpec.getUserKeyingMaterial();
}
MQVPrivateParameters localParams = new MQVPrivateParameters(staticPrivKey, ephemPrivKey, ephemPubKey);
this.parameters = staticPrivKey.getParameters();
// TODO Validate that all the keys are using the same parameters?
agreement.init(localParams);
}
else
{
if (!(key instanceof PrivateKey))
{
throw new InvalidKeyException(kaAlgorithm + " key agreement requires "
+ getSimpleName(ECPrivateKey.class) + " for initialisation");
}
ECPrivateKeyParameters privKey = (ECPrivateKeyParameters)ECUtil.generatePrivateKeyParameter((PrivateKey)key);
this.parameters = privKey.getParameters();
ukmParameters = (parameterSpec instanceof UserKeyingMaterialSpec) ? ((UserKeyingMaterialSpec)parameterSpec).getUserKeyingMaterial() : null;
agreement.init(privKey);
}
}
private static String getSimpleName(Class clazz)
{
String fullName = clazz.getName();
return fullName.substring(fullName.lastIndexOf('.') + 1);
}
protected byte[] calcSecret()
{
return bigIntToBytes(result);
}
public static class DH
extends KeyAgreementSpi
{
public DH()
{
super("ECDH", new ECDHBasicAgreement(), null);
}
}
public static class DHC
extends KeyAgreementSpi
{
public DHC()
{
super("ECDHC", new ECDHCBasicAgreement(), null);
}
}
public static class MQV
extends KeyAgreementSpi
{
public MQV()
{
super("ECMQV", new ECMQVBasicAgreement(), null);
}
}
public static class DHwithSHA1KDF
extends KeyAgreementSpi
{
public DHwithSHA1KDF()
{
super("ECDHwithSHA1KDF", new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA1()));
}
}
public static class DHwithSHA1KDFAndSharedInfo
extends KeyAgreementSpi
{
public DHwithSHA1KDFAndSharedInfo()
{
super("ECDHwithSHA1KDF", new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA1()));
}
}
public static class CDHwithSHA1KDFAndSharedInfo
extends KeyAgreementSpi
{
public CDHwithSHA1KDFAndSharedInfo()
{
super("ECCDHwithSHA1KDF", new ECDHCBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA1()));
}
}
public static class DHwithSHA224KDFAndSharedInfo
extends KeyAgreementSpi
{
public DHwithSHA224KDFAndSharedInfo()
{
super("ECDHwithSHA224KDF", new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA224()));
}
}
public static class CDHwithSHA224KDFAndSharedInfo
extends KeyAgreementSpi
{
public CDHwithSHA224KDFAndSharedInfo()
{
super("ECCDHwithSHA224KDF", new ECDHCBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA224()));
}
}
public static class DHwithSHA256KDFAndSharedInfo
extends KeyAgreementSpi
{
public DHwithSHA256KDFAndSharedInfo()
{
super("ECDHwithSHA256KDF", new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA256()));
}
}
public static class CDHwithSHA256KDFAndSharedInfo
extends KeyAgreementSpi
{
public CDHwithSHA256KDFAndSharedInfo()
{
super("ECCDHwithSHA256KDF", new ECDHCBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA256()));
}
}
public static class DHwithSHA384KDFAndSharedInfo
extends KeyAgreementSpi
{
public DHwithSHA384KDFAndSharedInfo()
{
super("ECDHwithSHA384KDF", new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA384()));
}
}
public static class CDHwithSHA384KDFAndSharedInfo
extends KeyAgreementSpi
{
public CDHwithSHA384KDFAndSharedInfo()
{
super("ECCDHwithSHA384KDF", new ECDHCBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA384()));
}
}
public static class DHwithSHA512KDFAndSharedInfo
extends KeyAgreementSpi
{
public DHwithSHA512KDFAndSharedInfo()
{
super("ECDHwithSHA512KDF", new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA512()));
}
}
public static class CDHwithSHA512KDFAndSharedInfo
extends KeyAgreementSpi
{
public CDHwithSHA512KDFAndSharedInfo()
{
super("ECCDHwithSHA512KDF", new ECDHCBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA512()));
}
}
public static class MQVwithSHA1KDFAndSharedInfo
extends KeyAgreementSpi
{
public MQVwithSHA1KDFAndSharedInfo()
{
super("ECMQVwithSHA1KDF", new ECMQVBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA1()));
}
}
public static class MQVwithSHA224KDFAndSharedInfo
extends KeyAgreementSpi
{
public MQVwithSHA224KDFAndSharedInfo()
{
super("ECMQVwithSHA224KDF", new ECMQVBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA224()));
}
}
public static class MQVwithSHA256KDFAndSharedInfo
extends KeyAgreementSpi
{
public MQVwithSHA256KDFAndSharedInfo()
{
super("ECMQVwithSHA256KDF", new ECMQVBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA256()));
}
}
public static class MQVwithSHA384KDFAndSharedInfo
extends KeyAgreementSpi
{
public MQVwithSHA384KDFAndSharedInfo()
{
super("ECMQVwithSHA384KDF", new ECMQVBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA384()));
}
}
public static class MQVwithSHA512KDFAndSharedInfo
extends KeyAgreementSpi
{
public MQVwithSHA512KDFAndSharedInfo()
{
super("ECMQVwithSHA512KDF", new ECMQVBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA512()));
}
}
public static class DHwithSHA1CKDF
extends KeyAgreementSpi
{
public DHwithSHA1CKDF()
{
super("ECDHwithSHA1CKDF", new ECDHCBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA1()));
}
}
public static class DHwithSHA256CKDF
extends KeyAgreementSpi
{
public DHwithSHA256CKDF()
{
super("ECDHwithSHA256CKDF", new ECDHCBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA256()));
}
}
public static class DHwithSHA384CKDF
extends KeyAgreementSpi
{
public DHwithSHA384CKDF()
{
super("ECDHwithSHA384CKDF", new ECDHCBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA384()));
}
}
public static class DHwithSHA512CKDF
extends KeyAgreementSpi
{
public DHwithSHA512CKDF()
{
super("ECDHwithSHA512CKDF", new ECDHCBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA512()));
}
}
public static class MQVwithSHA1CKDF
extends KeyAgreementSpi
{
public MQVwithSHA1CKDF()
{
super("ECMQVwithSHA1CKDF", new ECMQVBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA1()));
}
}
public static class MQVwithSHA224CKDF
extends KeyAgreementSpi
{
public MQVwithSHA224CKDF()
{
super("ECMQVwithSHA224CKDF", new ECMQVBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA224()));
}
}
public static class MQVwithSHA256CKDF
extends KeyAgreementSpi
{
public MQVwithSHA256CKDF()
{
super("ECMQVwithSHA256CKDF", new ECMQVBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA256()));
}
}
public static class MQVwithSHA384CKDF
extends KeyAgreementSpi
{
public MQVwithSHA384CKDF()
{
super("ECMQVwithSHA384CKDF", new ECMQVBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA384()));
}
}
public static class MQVwithSHA512CKDF
extends KeyAgreementSpi
{
public MQVwithSHA512CKDF()
{
super("ECMQVwithSHA512CKDF", new ECMQVBasicAgreement(), new ConcatenationKDFGenerator(DigestFactory.createSHA512()));
}
}
}