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Java utility collections, development by Nervousync Studio (NSYC)
There is a newer version: 1.2.1
/*
 * Licensed to the Nervousync Studio (NSYC) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.nervousync.security.crypto.impl;

import org.nervousync.security.config.CipherConfig;
import org.nervousync.security.crypto.BaseCryptoAdapter;
import org.nervousync.security.crypto.SymmetricCryptoAdapter;
import org.nervousync.enumerations.crypto.CryptoMode;
import org.nervousync.exceptions.crypto.CryptoException;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.SecureRandom;

/**
 * Symmetric SM4 crypto adapter class
 * SM4对称加密解密适配器的实现类
 *
 * @author Steven Wee	[email protected]
 * @version $Revision: 1.0.0 $ $Date: Jan 13, 2012 13:33:27 $
 */
public final class SM4CryptoAdapterImpl extends SymmetricCryptoAdapter {

    /**
     * Constructor for SM4CryptoAdapterImpl
     * SM4对称加密解密适配器实现类的构造方法
     *
     * @param cipherConfig      Cipher configure
     *                          密码设置
     * @param cryptoMode        Crypto mode
     *                          加密解密模式
     * @param keyBytes          Key data bytes
     *                          密钥字节数组
     * @param randomAlgorithm   Random algorithm
     *                          随机数算法
     *
     * @throws CryptoException
     * If an error occurs when initialize cipher
     * 当初始化加密解密实例对象时出现异常
     */
    public SM4CryptoAdapterImpl(CipherConfig cipherConfig, CryptoMode cryptoMode,
                                byte[] keyBytes, String randomAlgorithm) throws CryptoException {
        super(cipherConfig, cryptoMode, new CipherKey(128, keyBytes, randomAlgorithm));
    }
    /**
     * (Non-Javadoc)
     * @see BaseCryptoAdapter#initCipher()
     */
    @Override
    protected Cipher initCipher() throws CryptoException {
        try {
            KeyGenerator keyGenerator = KeyGenerator.getInstance("SM4", "BC");
            SecureRandom secureRandom = SecureRandom.getInstance(this.cipherKey.getRandomAlgorithm());
            secureRandom.setSeed(this.cipherKey.getKeyBytes());
            keyGenerator.init(this.cipherKey.getKeySize(), secureRandom);
            return super.generateCipher(keyGenerator.generateKey(),
                    this.cipherConfig.getMode().equalsIgnoreCase("ECB") ? 0 : 16);
        } catch (Exception e) {
            if (e instanceof CryptoException) {
                throw (CryptoException) e;
            }
            throw new CryptoException(0x00000015000BL, "Init_Cipher_Crypto_Error", e);
        }
    }
}