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Java utility collections, development by Nervousync Studio (NSYC)
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/*
 * 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.digest.impl;

import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.jcajce.provider.digest.SHA1;
import org.nervousync.security.digest.BaseDigestAdapter;
import org.nervousync.exceptions.crypto.CryptoException;

import java.security.MessageDigest;

/**
 * Symmetric SHA1 crypto adapter class
 * SHA1摘要算法适配器的实现类
 *
 * @author Steven Wee	[email protected]
 * @version $Revision: 1.0.0 $ $Date: Jan 13, 2012 13:54:22 $
 */
public final class SHA1DigestAdapterImpl extends BaseDigestAdapter {
    /**
     * Constructor for SHA1DigestAdapterImpl
     * SHA1摘要算法适配器实现类类的构造方法
     *
     * @throws CryptoException
     * If an error occurs when initialize adaptor
     * 当初始化适配器时出现异常
     */
    public SHA1DigestAdapterImpl() throws CryptoException {
        super("SHA-1", new byte[0]);
    }
    /**
     * Constructor for SHA1DigestAdapterImpl
     * SHA1摘要算法适配器实现类类的构造方法
     *
     * @param keyBytes      Hmac key data bytes
     *                      消息认证码算法密钥数据数组
     *
     * @throws CryptoException
     * If an error occurs when initialize adaptor
     * 当初始化适配器时出现异常
     */
    public SHA1DigestAdapterImpl(final byte[] keyBytes) throws CryptoException {
        super("SHA-1/HMAC", keyBytes);
    }
    /**
	 * Abstract method for initialize MessageDigest instance
	 * 抽象方法用于初始化消息摘要算法适配器实例对象
     *
     * @param algorithm     Cipher Algorithm
     *                      密码算法
     *
     * @return  Initialized MessageDigest instance
     *          初始化的消息摘要算法适配器
     */
    @Override
    protected MessageDigest initDigest(final String algorithm) throws CryptoException {
        if ("SHA-1".equalsIgnoreCase(algorithm)) {
            return new SHA1.Digest();
        }
        throw new CryptoException(0x00000015000DL, "Unknown_Algorithm_Digits_Error");
    }
    /**
	 * Abstract method for initialize Hmac instance
	 * 抽象方法用于初始化消息认证码适配器实例对象
     *
     * @param algorithm     Cipher Algorithm
     *                      密码算法
     * @param keyBytes      Hmac key data bytes
     *                      消息认证码算法密钥数据数组
     *
     * @return  Initialized Hmac instance
     *          初始化的消息认证码算法适配器
     */
    @Override
    protected HMac initHmac(final String algorithm, final byte[] keyBytes) throws CryptoException {
        if ("SHA-1/HMAC".equalsIgnoreCase(algorithm)) {
            HMac hmac = new HMac(new SHA1Digest());
            hmac.init(new KeyParameter(keyBytes));
            return hmac;
        }
        throw new CryptoException(0x00000015000DL, "Unknown_Algorithm_Digits_Error", algorithm);
    }
}