public class DESHelper

    {

        /// <summary>

        /// DES加密算法

        /// </summary>

        /// <param name="encryptString">要加密的字符串</param>

        /// <param name="sKey">加密码Key</param>

        /// <returns>正确返回加密后的结果，错误返回源字符串</returns>

        public static string ToDESEncrypt(string encryptString, string sKey)

        {

            try

            {

                byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);

                byte[] keyIV = keyBytes;

                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

                DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();

                // java 默认的是ECB模式，PKCS5padding；c#默认的CBC模式，PKCS7padding 所以这里我们默认使用ECB方式

                desProvider.Mode = CipherMode.ECB;

                MemoryStream memStream = new MemoryStream();

                CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);

                crypStream.Write(inputByteArray, , inputByteArray.Length);

                crypStream.FlushFinalBlock();

                return Convert.ToBase64String(memStream.ToArray());

            }

            catch

            {

                return encryptString;

            }

        }

        /// <summary>

        /// DES解密算法

        /// </summary>

        /// <param name="decryptString">要解密的字符串</param>

        /// <param name="sKey">加密Key</param>

        /// <returns>正确返回加密后的结果，错误返回源字符串</returns>

        public static string ToDESDecrypt(string decryptString, string sKey)

        {

            byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);

            byte[] keyIV = keyBytes;

            byte[] inputByteArray = Convert.FromBase64String(decryptString);

            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();

            // java 默认的是ECB模式，PKCS5padding；c#默认的CBC模式，PKCS7padding 所以这里我们默认使用ECB方式

            desProvider.Mode = CipherMode.ECB;

            MemoryStream memStream = new MemoryStream();

            CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);

            crypStream.Write(inputByteArray, , inputByteArray.Length);

            crypStream.FlushFinalBlock();

            return Encoding.Default.GetString(memStream.ToArray());

        }

    }

 public class DESHelper {

     private byte[] desKey;

     public DES(String desKey) {

         this.desKey = desKey.getBytes();

     }

     public byte[] desEncrypt(byte[] plainText) throws Exception {

         SecureRandom sr = new SecureRandom();

         byte rawKeyData[] = desKey;

         DESKeySpec dks = new DESKeySpec(rawKeyData);

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

         SecretKey key = keyFactory.generateSecret(dks);

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

         cipher.init(Cipher.ENCRYPT_MODE, key, sr);

         byte data[] = plainText;

         byte encryptedData[] = cipher.doFinal(data);

         return encryptedData;

     }

     public byte[] desDecrypt(byte[] encryptText) throws Exception {

         SecureRandom sr = new SecureRandom();

         byte rawKeyData[] = desKey;

         DESKeySpec dks = new DESKeySpec(rawKeyData);

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

         SecretKey key = keyFactory.generateSecret(dks);

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

         cipher.init(Cipher.DECRYPT_MODE, key, sr);

         byte encryptedData[] = encryptText;

         byte decryptedData[] = cipher.doFinal(encryptedData);

         return decryptedData;

     }

     public String encrypt(String input) throws Exception {

         return base64Encode(desEncrypt(input.getBytes()));

     }

     public String decrypt(String input) throws Exception {

         byte[] result = base64Decode(input);

         return new String(desDecrypt(result));

     }

     public static String base64Encode(byte[] s) {

         if (s == null)

             return null;

         BASE64Encoder b = new sun.misc.BASE64Encoder();

         return b.encode(s);

     }

     public static byte[] base64Decode(String s) throws IOException {

         if (s == null)

             return null;

         BASE64Decoder decoder = new BASE64Decoder();

         byte[] b = decoder.decodeBuffer(s);

         return b;

     }

 }