/// <summary>
    /// DES加密解密帮助类
    /// </summary>
    public static class DESHelper
    {
        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="pToEncrypt"></param>
        /// <param name="sKey">密钥(8位字符)</param>
        /// <returns></returns>
        public static string MD5Encrypt(string pToEncrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();


        }

        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="pToDecrypt"></param>
        /// <param name="sKey">密钥(8位字符)</param>
        /// <returns></returns>
        public static string MD5Decrypt(string pToDecrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }

class Program
    {
        static void Main(string[] args)
        {
            #region DES加密
            string password = "abcd";
            string key = "12345678";
            string encrypPassword = DESHelper.MD5Encrypt(password, key);
            Console.WriteLine("原来的：" + password);
            Console.WriteLine("加密后："+encrypPassword);
            #endregion
            #region DES解密
            string decryptPassword = DESHelper.MD5Decrypt(encrypPassword, key);
            Console.WriteLine("解密后：" + decryptPassword);
            Console.ReadKey();
            #endregion
        }
    }

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;


public class Des {
      /**
     * 加密
     * @param data
     * @param sKey
     * @return
     */
    public static byte[] encrypt(byte[] data, String sKey) {
        try {
            byte[] key = sKey.getBytes();
            // 初始化向量
            IvParameterSpec iv = new IvParameterSpec(key);
            DESKeySpec desKey = new DESKeySpec(key);
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成securekey
            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/CBC/PKCS5Padding");
            // 用密匙初始化Cipher对象
            cipher.init(Cipher.ENCRYPT_MODE, securekey, iv);
            // 现在，获取数据并加密
            // 正式执行加密操作
            return cipher.doFinal(data);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     * @param src
     * @param sKey
     * @return
     * @throws Exception
     */
    public static byte[] decrypt(byte[] src, String sKey) throws Exception {
        byte[] key = sKey.getBytes();
        // 初始化向量
        IvParameterSpec iv = new IvParameterSpec(key);
        // 创建一个DESKeySpec对象
        DESKeySpec desKey = new DESKeySpec(key);
        // 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/CBC/PKCS5Padding");
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, iv);
        // 真正开始解密操作
        return cipher.doFinal(src);
    }

    /**
     * 将二进制转换成16进制
     *
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 将16进制转换为二进制
     *
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }
}

import java.nio.charset.Charset;


public class DesUtil {
    /**
     * 加密
     * @param srcStr
     * @param charset
     * @param sKey
     * @return
     */
    public static String encrypt(String srcStr, Charset charset, String sKey) {
        byte[] src = srcStr.getBytes(charset);
        byte[] buf = Des.encrypt(src, sKey);
        return Des.parseByte2HexStr(buf);
    }

    /**
     * 解密
     *
     * @param hexStr
     * @param sKey
     * @return
     * @throws Exception
     */
    public static String decrypt(String hexStr, Charset charset, String sKey) throws Exception {
        byte[] src = Des.parseHexStr2Byte(hexStr);
        byte[] buf = Des.decrypt(src, sKey);
        return new String(buf, charset);
    }
}

import java.nio.charset.Charset;

public class Test {

    private static final String SKEY = "12345678";
    private static final Charset CHARSET = Charset.forName("UTF-8");

    public static void main(String[] args) {
        // 待加密内容
        String password = "abcd";
        String encryptPassword = DesUtil.encrypt(password, CHARSET, SKEY);
        System.out.println("原来的：" + password);
        System.out.println("加密后："+encryptPassword);
        // 直接将如上内容解密
        String decryPassword;
        try {
            decryPassword = DesUtil.decrypt(encryptPassword, CHARSET, SKEY);
            System.out.println("解密后："+decryPassword);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}