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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms.
This jar contains JCE provider for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7.
package org.spongycastle.jcajce.provider.asymmetric.ec;
import java.math.BigInteger;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidParameterException;
import java.security.KeyPair;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.ECGenParameterSpec;
import java.util.Hashtable;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.nist.NISTNamedCurves;
import org.spongycastle.asn1.sec.SECNamedCurves;
import org.spongycastle.asn1.teletrust.TeleTrusTNamedCurves;
import org.spongycastle.asn1.x9.X962NamedCurves;
import org.spongycastle.asn1.x9.X9ECParameters;
import org.spongycastle.crypto.AsymmetricCipherKeyPair;
import org.spongycastle.crypto.generators.ECKeyPairGenerator;
import org.spongycastle.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECKeyGenerationParameters;
import org.spongycastle.crypto.params.ECPrivateKeyParameters;
import org.spongycastle.crypto.params.ECPublicKeyParameters;
import org.spongycastle.jcajce.provider.config.ProviderConfiguration;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import org.spongycastle.jce.spec.ECNamedCurveGenParameterSpec;
import org.spongycastle.jce.spec.ECNamedCurveSpec;
import org.spongycastle.jce.spec.ECParameterSpec;
import org.spongycastle.math.ec.ECCurve;
import org.spongycastle.math.ec.ECPoint;
public abstract class KeyPairGeneratorSpi
extends java.security.KeyPairGenerator
{
public KeyPairGeneratorSpi(String algorithmName)
{
super(algorithmName);
}
public static class EC
extends KeyPairGeneratorSpi
{
ECKeyGenerationParameters param;
ECKeyPairGenerator engine = new ECKeyPairGenerator();
Object ecParams = null;
int strength = 239;
int certainty = 50;
SecureRandom random = new SecureRandom();
boolean initialised = false;
String algorithm;
ProviderConfiguration configuration;
static private Hashtable ecParameters;
static {
ecParameters = new Hashtable();
ecParameters.put(new Integer(192), new ECGenParameterSpec("prime192v1")); // a.k.a P-192
ecParameters.put(new Integer(239), new ECGenParameterSpec("prime239v1"));
ecParameters.put(new Integer(256), new ECGenParameterSpec("prime256v1")); // a.k.a P-256
ecParameters.put(new Integer(224), new ECGenParameterSpec("P-224"));
ecParameters.put(new Integer(384), new ECGenParameterSpec("P-384"));
ecParameters.put(new Integer(521), new ECGenParameterSpec("P-521"));
}
public EC()
{
super("EC");
this.algorithm = "EC";
this.configuration = BouncyCastleProvider.CONFIGURATION;
}
public EC(
String algorithm,
ProviderConfiguration configuration)
{
super(algorithm);
this.algorithm = algorithm;
this.configuration = configuration;
}
public void initialize(
int strength,
SecureRandom random)
{
this.strength = strength;
this.random = random;
ECGenParameterSpec ecParams = (ECGenParameterSpec)ecParameters.get(new Integer(strength));
if (ecParams != null)
{
try
{
initialize(ecParams, random);
}
catch (InvalidAlgorithmParameterException e)
{
throw new InvalidParameterException("key size not configurable.");
}
}
else
{
throw new InvalidParameterException("unknown key size.");
}
}
public void initialize(
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException
{
if (params instanceof ECParameterSpec)
{
ECParameterSpec p = (ECParameterSpec)params;
this.ecParams = params;
param = new ECKeyGenerationParameters(new ECDomainParameters(p.getCurve(), p.getG(), p.getN()), random);
engine.init(param);
initialised = true;
}
else if (params instanceof java.security.spec.ECParameterSpec)
{
java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)params;
this.ecParams = params;
ECCurve curve = EC5Util.convertCurve(p.getCurve());
ECPoint g = EC5Util.convertPoint(curve, p.getGenerator(), false);
param = new ECKeyGenerationParameters(new ECDomainParameters(curve, g, p.getOrder(), BigInteger.valueOf(p.getCofactor())), random);
engine.init(param);
initialised = true;
}
else if (params instanceof ECGenParameterSpec || params instanceof ECNamedCurveGenParameterSpec)
{
String curveName;
if (params instanceof ECGenParameterSpec)
{
curveName = ((ECGenParameterSpec)params).getName();
}
else
{
curveName = ((ECNamedCurveGenParameterSpec)params).getName();
}
X9ECParameters ecP = X962NamedCurves.getByName(curveName);
if (ecP == null)
{
ecP = SECNamedCurves.getByName(curveName);
if (ecP == null)
{
ecP = NISTNamedCurves.getByName(curveName);
}
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.getByName(curveName);
}
if (ecP == null)
{
// See if it's actually an OID string (SunJSSE ServerHandshaker setupEphemeralECDHKeys bug)
try
{
ASN1ObjectIdentifier oid = new ASN1ObjectIdentifier(curveName);
ecP = X962NamedCurves.getByOID(oid);
if (ecP == null)
{
ecP = SECNamedCurves.getByOID(oid);
}
if (ecP == null)
{
ecP = NISTNamedCurves.getByOID(oid);
}
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.getByOID(oid);
}
if (ecP == null)
{
throw new InvalidAlgorithmParameterException("unknown curve OID: " + curveName);
}
}
catch (IllegalArgumentException ex)
{
throw new InvalidAlgorithmParameterException("unknown curve name: " + curveName);
}
}
}
this.ecParams = new ECNamedCurveSpec(
curveName,
ecP.getCurve(),
ecP.getG(),
ecP.getN(),
ecP.getH(),
null); // ecP.getSeed()); Work-around JDK bug -- it won't look up named curves properly if seed is present
java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)ecParams;
ECCurve curve = EC5Util.convertCurve(p.getCurve());
ECPoint g = EC5Util.convertPoint(curve, p.getGenerator(), false);
param = new ECKeyGenerationParameters(new ECDomainParameters(curve, g, p.getOrder(), BigInteger.valueOf(p.getCofactor())), random);
engine.init(param);
initialised = true;
}
else if (params == null && configuration.getEcImplicitlyCa() != null)
{
ECParameterSpec p = configuration.getEcImplicitlyCa();
this.ecParams = params;
param = new ECKeyGenerationParameters(new ECDomainParameters(p.getCurve(), p.getG(), p.getN()), random);
engine.init(param);
initialised = true;
}
else if (params == null && configuration.getEcImplicitlyCa() == null)
{
throw new InvalidAlgorithmParameterException("null parameter passed but no implicitCA set");
}
else
{
throw new InvalidAlgorithmParameterException("parameter object not a ECParameterSpec");
}
}
public KeyPair generateKeyPair()
{
if (!initialised)
{
throw new IllegalStateException("EC Key Pair Generator not initialised");
}
AsymmetricCipherKeyPair pair = engine.generateKeyPair();
ECPublicKeyParameters pub = (ECPublicKeyParameters)pair.getPublic();
ECPrivateKeyParameters priv = (ECPrivateKeyParameters)pair.getPrivate();
if (ecParams instanceof ECParameterSpec)
{
ECParameterSpec p = (ECParameterSpec)ecParams;
BCECPublicKey pubKey = new BCECPublicKey(algorithm, pub, p, configuration);
return new KeyPair(pubKey,
new BCECPrivateKey(algorithm, priv, pubKey, p, configuration));
}
else if (ecParams == null)
{
return new KeyPair(new BCECPublicKey(algorithm, pub, configuration),
new BCECPrivateKey(algorithm, priv, configuration));
}
else
{
java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)ecParams;
BCECPublicKey pubKey = new BCECPublicKey(algorithm, pub, p, configuration);
return new KeyPair(pubKey, new BCECPrivateKey(algorithm, priv, pubKey, p, configuration));
}
}
}
public static class ECDSA
extends EC
{
public ECDSA()
{
super("ECDSA", BouncyCastleProvider.CONFIGURATION);
}
}
public static class ECDH
extends EC
{
public ECDH()
{
super("ECDH", BouncyCastleProvider.CONFIGURATION);
}
}
public static class ECDHC
extends EC
{
public ECDHC()
{
super("ECDHC", BouncyCastleProvider.CONFIGURATION);
}
}
public static class ECMQV
extends EC
{
public ECMQV()
{
super("ECMQV", BouncyCastleProvider.CONFIGURATION);
}
}
}