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/*
 * Copyright 2002-2010 the original author or authors.
 *
 * 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 com.huaweicloud.dis.util.encrypt;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * 
 * AES Coder
 * 
 * 
 * secret key length: 128bit, default: 128 bit
 * 
 * 
 * mode: ECB/CBC/PCBC/CTR/CTS/CFB/CFB8 to CFB128/OFB/OBF8 to OFB128
 * 
 * 
 * padding: Nopadding/PKCS5Padding/ISO10126Padding/
 * 
 * 
 * @author Aub
 *         
 */
public class AESCoder
{
    
    /**
     * 密钥算法
     */
    private static final String KEY_ALGORITHM = "AES";
    
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    
    /**
     * 初始化密钥
     * 
     * @return byte[] 密钥
     * @throws NoSuchAlgorithmException @
     */
    public static byte[] initSecretKey()
        throws NoSuchAlgorithmException
    {
        // 返回生成指定算法的秘密密钥的 KeyGenerator 对象
        KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        // 初始化此密钥生成器，使其具有确定的密钥大小
        // AES 要求密钥长度为 128
        kg.init(128);
        // 生成一个密钥
        SecretKey secretKey = kg.generateKey();
        return secretKey.getEncoded();
    }
    
    /**
     * 转换密钥
     * 
     * @param key 二进制密钥
     * @return 密钥
     */
    private static Key toKey(byte[] key)
    {
        // 生成密钥
        return new SecretKeySpec(key, KEY_ALGORITHM);
    }
    
    /**
     * 加密
     * 
     * @param data 待加密数据
     * @param key 二进制密钥
     * @param ivbs 加密向量
     * @return byte[] 加密数据
     * @throws BadPaddingException BadPaddingException
     * @throws IllegalBlockSizeException IllegalBlockSizeException
     * @throws NoSuchPaddingException NoSuchPaddingException
     * @throws NoSuchAlgorithmException NoSuchAlgorithmException
     * @throws InvalidKeyException InvalidKeyException
     * @throws InvalidAlgorithmParameterException InvalidAlgorithmParameterException
     */
    public static byte[] encrypt(byte[] data, byte[] key, byte[] ivbs)
        throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException
    {
        return encrypt(data, key, DEFAULT_CIPHER_ALGORITHM, ivbs);
    }
    
    /**
     * 加密
     * 
     * @param data 待加密数据
     * @param keybs 密钥
     * @param cipherAlgorithm 加密算法/工作模式/填充方式
     * @param ivbs 加密向量
     * @return byte[] 加密数据
     * @throws NoSuchPaddingException NoSuchPaddingException
     * @throws NoSuchAlgorithmException NoSuchAlgorithmException
     * @throws InvalidKeyException InvalidKeyException
     * @throws BadPaddingException BadPaddingException
     * @throws IllegalBlockSizeException IllegalBlockSizeException
     * @throws InvalidAlgorithmParameterException InvalidAlgorithmParameterException
     */
    public static byte[] encrypt(byte[] data, byte[] keybs, String cipherAlgorithm, byte[] ivbs)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException
    {
        Key key = toKey(keybs);
        // 实例化
        Cipher cipher = Cipher.getInstance(cipherAlgorithm);
        
        IvParameterSpec iv = new IvParameterSpec(ivbs);
        // 使用密钥初始化，设置为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        
        // 执行操作
        return cipher.doFinal(data);
    }
    
    /**
     * 解密
     * 
     * @param data 待解密数据
     * @param key 二进制密钥
     * @param ivbs 加密向量
     * @return byte[] 解密数据
     * @throws BadPaddingException BadPaddingException
     * @throws IllegalBlockSizeException IllegalBlockSizeException
     * @throws NoSuchPaddingException NoSuchPaddingException
     * @throws NoSuchAlgorithmException NoSuchAlgorithmException
     * @throws InvalidKeyException InvalidKeyException
     * @throws InvalidAlgorithmParameterException InvalidAlgorithmParameterException
     */
    public static byte[] decrypt(byte[] data, byte[] key, byte[] ivbs)
        throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException
    {
        return decrypt(data, key, DEFAULT_CIPHER_ALGORITHM, ivbs);
    }
    
    /**
     * 解密
     * 
     * @param data 待解密数据
     * @param keybs 密钥
     * @param cipherAlgorithm 加密算法/工作模式/填充方式
     * @param ivbs 加密向量
     * @return byte[] 解密数据
     * @throws NoSuchPaddingException NoSuchPaddingException
     * @throws NoSuchAlgorithmException NoSuchAlgorithmException
     * @throws InvalidKeyException InvalidKeyException
     * @throws BadPaddingException BadPaddingException
     * @throws IllegalBlockSizeException IllegalBlockSizeException
     * @throws InvalidAlgorithmParameterException InvalidAlgorithmParameterException
     */
    public static byte[] decrypt(byte[] data, byte[] keybs, String cipherAlgorithm, byte[] ivbs)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException
    {
        Key key = toKey(keybs);
        // 实例化
        Cipher cipher = Cipher.getInstance(cipherAlgorithm);
        // 使用密钥初始化，设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivbs));
        // 执行操作
        return cipher.doFinal(data);
    }
    
    // private static String showByteArray(byte[] data){
    // if(null == data){
    // return null;
    // }
    // StringBuilder sb = new StringBuilder("{");
    // for(byte b:data){
    // sb.append(b).append(",");
    // }
    // sb.deleteCharAt(sb.length()-1);
    // sb.append("}");
    // return sb.toString();
    // }
    
    // public static void main(String[] args) throws InvalidKeyException, NoSuchAlgorithmException,
    // NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
    // byte[] key = initSecretKey();
    // System.out.println("key："+showByteArray(key));
    // System.out.println(Hex.encodeHexStr(key));
    //
    // Key k = toKey(key);
    //
    // byte[] ivbs = Hex.decodeHex(EncryptUtils.randomHex(16).toCharArray());
    //
    // String data ="AES数据";
    // System.out.println("加密前数据: string:"+data);
    // System.out.println("加密前数据: byte[]:"+showByteArray(data.getBytes()));
    // System.out.println();
    // byte[] encryptData = encrypt(data.getBytes(), key, ivbs);
    // System.out.println("加密后数据: byte[]:"+showByteArray(encryptData));
    // System.out.println("加密后数据: hexStr:"+Hex.encodeHexStr(encryptData));
    // System.out.println();
    // byte[] decryptData = decrypt(encryptData, key, ivbs);
    // System.out.println("解密后数据: byte[]:"+showByteArray(decryptData));
    // System.out.println("解密后数据: string:"+new String(decryptData));
    //
    // }
}