C# Java DES加密解密

转自http://www.cnblogs.com/zhuiyi/archive/2013/04/01/2993201.html

最近被DES加解密弄得超级郁闷，我用C#的方法加密得到的密文老是跟客户给的Java的加密密文不同，找了很多资料都没有得到解决。直到看到上面的博文，才解决掉这个问题。这里mark一下，以免忘记！

先来个C#版的：

 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());

        }
    }

再来个Java版的

 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;
     }

 }