C# 实现 加密、解密使用AES算法的OFB模式（不填充，明文与密文长度一致）

[SurpassCode]

 //默认密钥向量 
 byte[] _key1 = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
//加密KEY
  byte[] Key = Encoding.UTF8.GetBytes("12345678901234567890123456789012");
//加密方法
  public static byte[] EncryptStringToBytes_Aes(byte[] plainText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("Key");
            byte[] encrypted;
            // Create an AesCryptoServiceProvider object
            // with the specified key and IV.
            using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;
                aesAlg.Mode = CipherMode.OFB;
                aesAlg.Padding = PaddingMode.None;
         

                // Create a decrytor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                using (System.IO.MemoryStream msEncrypt = new System.IO.MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        //Write all data to the stream.
                        csEncrypt.Write(plainText, 0, plainText.Length);
                        csEncrypt.FlushFinalBlock();

                        encrypted = msEncrypt.ToArray();
                    }
                }
            }

            // Return the encrypted bytes from the memory stream.
            return encrypted;
        }

在 csEncrypt.FlushFinalBlock(); 报错

“System.Security.Cryptography.CryptographicException”类型的异常在 System.Core.dll 中发生，但未在用户代码中进行处理
其他信息: 输入数据不是完整的块。

求解答 如果使用ASE加密算法的OFB模式进行加密
最好能给个栗子！！谢谢

[yangbo50304]

可能是Key和IV的长度错了，你这个是128的还是256的长度？

[绿领巾童鞋]

http://social.msdn.microsoft.com/Forums/vstudio/en-US/891955cd-3125-487c-9746-9fd07f24b12f/why-net-doesnt-support-aes-ofb?forum=netfxbcl http://stackoverflow.com/questions/24515521/aes-ofb-encryption-for-rijndaelmanaged OFB模式估计要自己写。可以的话，也可以通过DLL调用...