1 public class DESHelper 2    { 3   4        /// <summary> 5        /// DES加密算法 6        /// </summary> 7        /// <param name="encryptString">要加密的字符串</param> 8        /// <param name="sKey">加密码Key</param> 9        /// <returns>正确返回加密后的结果，错误返回源字符串</returns>10        public static string ToDESEncrypt(string encryptString, string sKey)11        {12            try13            {14  15                byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);16                byte[] keyIV = keyBytes;17                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);18  19                DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();20  21                // 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22                desProvider.Mode = CipherMode.ECB;23                MemoryStream memStream = new MemoryStream();24                CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);25  26                crypStream.Write(inputByteArray, 0, inputByteArray.Length);27                crypStream.FlushFinalBlock();28                return Convert.ToBase64String(memStream.ToArray());29  30            }31            catch32            {33                return encryptString;34            }35        }36  37  38        /// <summary>39        /// DES解密算法40        /// </summary>41        /// <param name="decryptString">要解密的字符串</param>42        /// <param name="sKey">加密Key</param>43        /// <returns>正确返回加密后的结果，错误返回源字符串</returns>44        public static string ToDESDecrypt(string decryptString, string sKey)45        {46            byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);47            byte[] keyIV = keyBytes;48            byte[] inputByteArray = Convert.FromBase64String(decryptString);49  50            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();51  52            // 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53            desProvider.Mode = CipherMode.ECB;54            MemoryStream memStream = new MemoryStream();55            CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);56  57            crypStream.Write(inputByteArray, 0, inputByteArray.Length);58            crypStream.FlushFinalBlock();59            return Encoding.Default.GetString(memStream.ToArray());60  61        }62    }

 1 public class DESHelper { 2   3     private byte[] desKey; 4   5     public DES(String desKey) { 6         this.desKey = desKey.getBytes(); 7     } 8   9     public byte[] desEncrypt(byte[] plainText) throws Exception {10         SecureRandom sr = new SecureRandom();11         byte rawKeyData[] = desKey;12         DESKeySpec dks = new DESKeySpec(rawKeyData);13         SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");14         SecretKey key = keyFactory.generateSecret(dks);15         Cipher cipher = Cipher.getInstance("DES");16         cipher.init(Cipher.ENCRYPT_MODE, key, sr);17         byte data[] = plainText;18         byte encryptedData[] = cipher.doFinal(data);19         return encryptedData;20     }21  22     public byte[] desDecrypt(byte[] encryptText) throws Exception {23         SecureRandom sr = new SecureRandom();24         byte rawKeyData[] = desKey;25         DESKeySpec dks = new DESKeySpec(rawKeyData);26         SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");27         SecretKey key = keyFactory.generateSecret(dks);28         Cipher cipher = Cipher.getInstance("DES");29         cipher.init(Cipher.DECRYPT_MODE, key, sr);30         byte encryptedData[] = encryptText;31         byte decryptedData[] = cipher.doFinal(encryptedData);32         return decryptedData;33     }34  35     public String encrypt(String input) throws Exception {36         return base64Encode(desEncrypt(input.getBytes()));37     }38  39     public String decrypt(String input) throws Exception {40         byte[] result = base64Decode(input);41         return new String(desDecrypt(result));42     }43  44     public static String base64Encode(byte[] s) {45         if (s == null)46             return null;47         BASE64Encoder b = new sun.misc.BASE64Encoder();48         return b.encode(s);49     }50  51     public static byte[] base64Decode(String s) throws IOException {52         if (s == null)53             return null;54         BASE64Decoder decoder = new BASE64Decoder();55         byte[] b = decoder.decodeBuffer(s);56         return b;57     }58      59 }