加解密2-字符串

 1         /// <summary>
 2         /// DES加密字符串
 3         /// 加密密钥,要求为8位
 4         /// 加密成功返回加密后的字符串，失败返回源串
 5         /// </summary>
 6         /// <param name="encryptString">待加密的字符串</param>
 7         /// <param name="decryptIV">加密因子</param>
 8         /// <param name="encryptKey">加密密钥,要求为8位</param>
 9         /// <returns> 加密成功返回加密后的字符串，失败返回源串</returns>
10         public static string EncryptDES(string encryptString, string encryptIV, string encryptKey) 
11         {
12             try
13             {
14                 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
15                 byte[] rgbIV = Encoding.UTF8.GetBytes(encryptIV.Substring(0, 8));
16                 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
17                 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
18 
19                 MemoryStream mStream = new MemoryStream();
20                 //加密方式写入到mSteram
21                 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
22                 cStream.Write(inputByteArray, 0, inputByteArray.Length);
23                 cStream.FlushFinalBlock();
24                 return Convert.ToBase64String(mStream.ToArray());
25             }
26             catch
27             {
28                 return encryptString;//异常返回原始字符串 
29             }
30         }

 1          /// <summary>
 2         /// DES解密字符串
 3         /// 解密密钥,要求为8位,和加密密钥相同
 4         /// 解密成功返回解密后的字符串，失败返源串
 5         /// </summary>
 6         /// <param name="decryptString">待解密的字符串</param>
 7         /// <param name="decryptIV">解密因子</param>
 8         /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
 9         /// <returns>解密成功返回解密后的字符串，失败返源串</
10         public static string DecryptDES(string decryptString,string decryptIV,string decryptKey) 
11         {
12             try
13             {
14                 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
15                 byte[] rgbIV = Encoding.UTF8.GetBytes(decryptIV.Substring(0, 8));
16                 byte[] inputByteArray = Convert.FromBase64String(decryptString);
17                
18                 //算法
19                 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
20                
21                //基础流
22                 MemoryStream mStream = new MemoryStream();
23                 
24                 //以解密方式写入mStream
25                 CryptoStream cStream = new CryptoStream(mStream,DCSP.CreateDecryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
26                 cStream.Write(inputByteArray, 0, inputByteArray.Length);
27                 cStream.FlushFinalBlock();
28   
29                 return Encoding.UTF8.GetString(mStream.ToArray());
30             }
31             catch
32             {
33                 return decryptString;//异常返回原始字符串         
34             }
35         }