org.soulwing.credo.service.crypto.jca.JcaAESEncryptedSecretKeyWrapper.java Source code

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Here is the source code for org.soulwing.credo.service.crypto.jca.JcaAESEncryptedSecretKeyWrapper.java

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/*
 * File created on Mar 3, 2014 
 *
 * Copyright (c) 2014 Virginia Polytechnic Institute and State University
 *
 * 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.soulwing.credo.service.crypto.jca;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidParameterSpecException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;

import org.apache.commons.codec.binary.Hex;
import org.soulwing.credo.service.crypto.SecretKeyWrapper;
import org.soulwing.credo.service.pem.PemObjectBuilderFactory;

/**
 * A {@link SecretKeyWrapper} that delegates to a JCA {@link SecretKey}.
 *
 * @author Carl Harris
 */
public class JcaAESEncryptedSecretKeyWrapper extends JcaEncryptedSecretKeyWrapper {

    private final byte[] iv;

    /**
     * Constructs a new instance.
     * @param transform the cryptographic transform that was applied to 
     *    encrypt the key
     * @param iv initialization vector
     * @param cipherText cipher text of secret key's DER encoding
     * @param objectBuilderFactory PEM object builder factory
     */
    public JcaAESEncryptedSecretKeyWrapper(String transform, byte[] iv, byte[] cipherText,
            PemObjectBuilderFactory objectBuilderFactory) {
        super(transform, cipherText, objectBuilderFactory);
        this.iv = iv;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected String getDEKInfo() {
        return transform + "," + Hex.encodeHexString(iv);
    }

    @Override
    protected Cipher createCipher() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
            InvalidParameterSpecException, InvalidAlgorithmParameterException {
        Cipher cipher = Cipher.getInstance(transform);
        cipher.init(Cipher.UNWRAP_MODE, getKey(), new IvParameterSpec(iv));
        return cipher;
    }

}