/*
* Copyright 2012-2014 Brian Campbell
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jose4j.keys;
import org.jose4j.lang.JoseException;
import java.math.BigInteger;
import java.security.*;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.*;
/**
*/
public class EcKeyUtil extends KeyPairUtil
{
public static final String EC = "EC";
@Override
String getAlgorithm()
{
return EC;
}
public ECPublicKey publicKey(BigInteger x, BigInteger y, ECParameterSpec spec) throws JoseException
{
ECPoint w = new ECPoint(x, y);
ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(w, spec);
try
{
PublicKey publicKey = getKeyFactory().generatePublic(ecPublicKeySpec);
return (ECPublicKey) publicKey;
}
catch (InvalidKeySpecException e)
{
throw new JoseException("Invalid key spec: " + e, e);
}
}
public ECPrivateKey privateKey(BigInteger d, ECParameterSpec spec) throws JoseException
{
ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(d, spec);
try
{
PrivateKey privateKey = getKeyFactory().generatePrivate(ecPrivateKeySpec);
return (ECPrivateKey) privateKey;
}
catch (InvalidKeySpecException e)
{
throw new JoseException("Invalid key spec: " + e, e);
}
}
public KeyPair generateKeyPair(ECParameterSpec spec) throws JoseException
{
KeyPairGenerator keyGenerator = getKeyPairGenerator();
try
{
keyGenerator.initialize(spec);
return keyGenerator.generateKeyPair();
}
catch (InvalidAlgorithmParameterException e)
{
throw new JoseException("Unable to create EC key pair with spec " + spec, e);
}
}
}