package com.test.test1.util;

import java.security.MessageDigest;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class MD5 {

    //md5加密

    public static String string2MD5(String inStr){

        MessageDigest md5 = null;

        try{

            md5 = MessageDigest.getInstance("MD5");

        }catch (Exception e){

            System.out.println(e.toString());

            e.printStackTrace();

            return "";

        }

        char[] charArray = inStr.toCharArray();

        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++){

            byteArray[i] = (byte) charArray[i];

        }

        byte[] md5Bytes = md5.digest(byteArray);

        StringBuffer hexValue = new StringBuffer();

        for (int i = 0; i < md5Bytes.length; i++){

            int val = ((int) md5Bytes[i]) & 0xff;

            if (val < 16){

                hexValue.append("0");

            }

            hexValue.append(Integer.toHexString(val));

        }

        return hexValue.toString();

    }

    /**

     * 加密解密算法 执行一次加密，两次解密

     */

    public static String convertMD5(String inStr){

        char[] a = inStr.toCharArray();

        for (int i = 0; i < a.length; i++){

            a[i] = (char) (a[i] ^ 't');

        }

        String s = new String(a);

        return s;

    }

    /**

     * AES加密算法

     */

      public static byte[] encrypt(String content, String password)

      {

        try

        {

          KeyGenerator kgen = KeyGenerator.getInstance("AES");

          kgen.init(128, new SecureRandom(password.getBytes()));

          SecretKey secretKey = kgen.generateKey();

          byte[] enCodeFormat = secretKey.getEncoded();

          SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");

          Cipher cipher = Cipher.getInstance("AES");

          byte[] byteContent = content.getBytes("utf-8");

          cipher.init(1, key);

          return cipher.doFinal(byteContent);

        }

        catch (Exception e)

        {

          e.printStackTrace();

        }

        return null;

      }

    /**

     * AES解密算法

     */

      public static byte[] decrypt(byte[] content, String password)

      {

        try

        {

          KeyGenerator kgen = KeyGenerator.getInstance("AES");

          kgen.init(128, new SecureRandom(password.getBytes()));

          SecretKey secretKey = kgen.generateKey();

          byte[] enCodeFormat = secretKey.getEncoded();

          SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");

          Cipher cipher = Cipher.getInstance("AES");

          cipher.init(2, key);

          return cipher.doFinal(content);

        }

        catch (Exception e)

        {

          e.printStackTrace();

        }

        return null;

      }

    private static String aesKey="16位密钥";

    private static String deskey = "任意密钥";

    //AES加密PKCS5Padding

    public static String encryptAES(String source) throws Exception{

        SecretKeySpec skeySpec = new SecretKeySpec(aesKey.getBytes(), "AES");

        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

        byte[] encrypted = cipher.doFinal(source.getBytes("utf8"));

        String data=Base64.encodeBase64String(encrypted);

        return data;

    }

    //AES加密并转换为16进制字符，对应C#PKcs7padding加密

    public static String encryptAESTo16(String source) throws Exception{

        SecretKeySpec skeySpec = new SecretKeySpec(("16位密钥").getBytes(), "AES");

        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

        byte[] encrypted = cipher.doFinal(source.getBytes("utf8"));

        StringBuilder sb = new StringBuilder(encrypted.length * 2);

        for (byte b : encrypted)

        {

            sb.append(String.format("%02X", new Integer(b & 0xff)));

        }

        return sb.toString();

    }

    //AES解密PKCS5Padding

    public static String decryptAES(String encData) throws Exception{

        SecretKeySpec skeySpec = new SecretKeySpec(aesKey.getBytes(), "AES");

        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

        cipher.init(Cipher.DECRYPT_MODE, skeySpec);

        byte[] decrypted = cipher.doFinal(Base64.decodeBase64(encData));

        String json=new String(decrypted,"utf8");

        return json;

    }

    /**

     * DES加密

     */

    public static String encodeDES(String datasource){

        try{

            SecureRandom random = new SecureRandom();

            DESKeySpec desKey = new DESKeySpec(deskey.getBytes());

            //创建一个密匙工厂，然后用它把DESKeySpec转换成

            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

            SecretKey securekey = keyFactory.generateSecret(desKey);

            //Cipher对象实际完成加密操作

            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

            //用密匙初始化Cipher对象

            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);

            //现在，获取数据并加密

            return Base64.encodeBase64String(cipher.doFinal(datasource.getBytes()));

        }catch(Throwable e){

            e.printStackTrace();

            return null;

        }

    }

}

/** * DES解密 */

public String decode(String src) throws Exception {

    // DES算法要求有一个可信任的随机数源

    SecureRandom random = new SecureRandom();

    // 创建一个DESKeySpec对象

    DESKeySpec desKey = new DESKeySpec(deskey.getBytes());

    // 创建一个密匙工厂

    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

    // 将DESKeySpec对象转换成SecretKey对象

    SecretKey securekey = keyFactory.generateSecret(desKey);

    // Cipher对象实际完成解密操作

    Cipher cipher = Cipher.getInstance("DES");

    // 用密匙初始化Cipher对象

    cipher.init(Cipher.DECRYPT_MODE, securekey, random);

    // 真正开始解密操作

    return IOUtils.toString(cipher.doFinal(Base64.decodeBase64(src)),"UTF-8");

}