org.spongycastle.jcajce.provider.asymmetric.ec.KeyPairGeneratorSpi Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of prov Show documentation
Show all versions of prov Show documentation
Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle
intended for the Android platform. Android unfortunately ships with a stripped-down version of
Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full,
up-to-date version of the Bouncy Castle cryptographic libs.
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.x9.ECNamedCurveTable;
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.asymmetric.util.EC5Util;
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;
import org.spongycastle.util.Integers;
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(Integers.valueOf(192), new ECGenParameterSpec("prime192v1")); // a.k.a P-192
ecParameters.put(Integers.valueOf(239), new ECGenParameterSpec("prime239v1"));
ecParameters.put(Integers.valueOf(256), new ECGenParameterSpec("prime256v1")); // a.k.a P-256
ecParameters.put(Integers.valueOf(224), new ECGenParameterSpec("P-224"));
ecParameters.put(Integers.valueOf(384), new ECGenParameterSpec("P-384"));
ecParameters.put(Integers.valueOf(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(Integers.valueOf(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 = ECNamedCurveTable.getByName(curveName);
if (ecP == null)
{
// See if it's actually an OID string (SunJSSE ServerHandshaker setupEphemeralECDHKeys bug)
try
{
ASN1ObjectIdentifier oid = new ASN1ObjectIdentifier(curveName);
ecP = ECNamedCurveTable.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)
{
initialize(strength, new SecureRandom());
}
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);
}
}
}© 2015 - 2025 Weber Informatics LLC | Privacy Policy