java MD5/AES/DES加解密汇总

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");
}