输入数据不是 CFB 模式 AES-128 加密 C# 的完整块

Question

我正在尝试使用 AES-128、CFB 模式加密数据。下面的代码块适用于 dotnet 5.x 目标框架，但给出

The input data is not a complete block

dotnet 4.7.2 在 bw.write() 处出错。理想情况下，它应该工作，因为 CFB 模式将块密码转换为不需要填充的流密码。我也试过 csEncrypt.Write(dataToBeEncrypted, 0, dataToBeEncrypted.Length) 而不是 bw.Write()。在这种情况下，它在下一行失败，将内存流转换为数组并出现相同的错误。

     using (AesCryptoServiceProvider Aes128 = new AesCryptoServiceProvider())
     {

        Aes128.BlockSize = 128;
        Aes128.KeySize = 128;

        //
        // Specify CFB8 mode
        //
        Aes128.Mode = CipherMode.CFB;
        Aes128.FeedbackSize = 8;
        Aes128.Padding = PaddingMode.None;
        //
        // Generate and save random key and IV.
        //
        Aes128.GenerateIV();
        Aes128.Key = key;

        Aes128.IV.CopyTo(savedIV, 0);
        using (var encryptor = Aes128.CreateEncryptor())
        using (var msEncrypt = new MemoryStream())
        using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
        using (var bw = new BinaryWriter(csEncrypt, Encoding.UTF8))
        {
           bw.Write(dataToBeEncrypted);
           bw.Close();

           cipherBytes = msEncrypt.ToArray();
        }

Answer 1

问题已通过删除 Aes128.Padding = PaddingMode.None 得到解决；并让它由 PKC7 填充。正如@Topaco 所回答的那样，我将密文修剪为明文长度以删除填充 post 加密。

更新代码：

     using (AesCryptoServiceProvider Aes128 = new AesCryptoServiceProvider())
     {

        Aes128.BlockSize = 128;
        Aes128.KeySize = 128;

        //
        // Specify CFB8 mode
        //
        Aes128.Mode = CipherMode.CFB;
        Aes128.FeedbackSize = 8;
        //
        // Generate and save random key and IV.
        //
        Aes128.GenerateIV();
        Aes128.Key = key;

        Aes128.IV.CopyTo(savedIV, 0);
        using (var encryptor = Aes128.CreateEncryptor())
        using (var msEncrypt = new MemoryStream())
        using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
        using (var bw = new BinaryWriter(csEncrypt, Encoding.UTF8))
        {
           Console.WriteLine("About to binary write.");
           bw.Write(dataToBeEncrypted);
           bw.Close();
           Console.WriteLine("binary write successful.");

           cipherBytesWithPadding = msEncrypt.ToArray();
        }
        Buffer.BlockCopy(cipherBytesWithPadding, 0, cipherBytes, 0, dataToBeEncrypted.Length);

输入数据不是 CFB 模式 AES-128 加密 C# 的完整块

The input data is not a complete block for CFB mode AES-128 encryption C#

.net

c#

cryptography

aes