加密算法

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public class Cryptography     {         private static readonly Byte[] IV =         {             131, 124, 213, 11, 241, 214, 201, 103,             138, 225, 188, 216, 116, 247, 152, 145         };           private Byte[] aesKey =         {             121, 249, 165, 183, 172, 16, 18, 24,             111, 129, 121, 13, 152, 114, 238, 114         };           private Boolean isDefaultKey;           public String Key         {             get { return Convert.ToBase64String(this.aesKey); }             set             {                 this.aesKey = Convert.FromBase64String(value);                 this.isDefaultKey = false;             }         }           public bool IsDefaultKey         {             get { return this.isDefaultKey; }         }           public Byte[] Encrypt(Byte[] plainData)         {             using (var aesProvider = new AesCryptoServiceProvider())             {                 using (var stream = new MemoryStream())                 {                     using (var cryptoStream = new CryptoStream(                         stream,                         aesProvider.CreateEncryptor(this.aesKey, IV),                         CryptoStreamMode.Write))                     {                         cryptoStream.Write(plainData, 0, plainData.Length);                     }                     var encryptMessageBytes = stream.ToArray();                     var bts = new Byte[IV.Length + encryptMessageBytes.Length];                     Array.Copy(IV, 0, bts, 0, IV.Length);                     Array.Copy(encryptMessageBytes, 0, bts, IV.Length, encryptMessageBytes.Length);                     return bts;                 }             }         }           public Byte[] Decrypt(Byte[] encryptionData)         {             using (var aesProvider = new AesCryptoServiceProvider())             {                 using (var stream = new MemoryStream())                 {                     var iv = new Byte[16];                     Array.Copy(encryptionData, 0, iv, 0, iv.Length);                     using (var cryptoStream = new CryptoStream(                         stream,                         aesProvider.CreateDecryptor(this.aesKey, iv),                         CryptoStreamMode.Write))                     {                         cryptoStream.Write(encryptionData, IV.Length, encryptionData.Length - IV.Length);                     }                     return stream.ToArray();                 }             }         }           public String EncryptString(String plainString)         {             var buffer = Encoding.UTF8.GetBytes(plainString);             var encryptMessageBytes = this.Encrypt(buffer);             return Convert.ToBase64String(encryptMessageBytes);         }           public String DecryptString(String encryptedString)         {             var buffer = Convert.FromBase64String(encryptedString);             var decryptMessageBytes = this.Decrypt(buffer);             return Encoding.UTF8.GetString(decryptMessageBytes);         }     }