Question

我从使用ECB开始，因为我听说这是最容易开始的，所以我创建了一个控制台应用程序，接受输入加密，然后解密它并输出加密文本和解密文本。这一切都很完美。我去尝试使用CBC从头开始创建一个新程序，我收到一个错误：“填充无效，无法删除。”从我所看到的，我已经做了一切正确的事，任何人都可以指出我的问题可能是正确的方向吗？我已经尝试了我在博客和本网站上找到的一切无济于事。例外情况发生在DecryptData方法中的行DecryptedText = srDecrypt.ReadToEnd()。

RijndaelManaged rijm = new RijndaelManaged();
//more variables here

    protected void Page_Load(object sender, EventsArgs e)
    {
        //Convert Key from string to Byte Array Here

        rijm.BlockSize = 128;
        rijm.KeySize = 256;
        rijm.Key = keyByteArray;
        rijm.Mode = CipherMode.CBC;
        rijm.Padding = PaddingMode.PKCS7;
        ICryptoTransform crypt = rijm.CreateEncryptor(keyByteArray, null);

        using(crypt)
        {
           byte[] value1Cipher = EncryptData(crypt, value1);
           byte[] value2Cihper = EncryptData(crypt, value2);

           encryptedValue1 = Convert.ToBase64String(vaue1Cipher);
           encrpytedValue2 = Convert.ToBase64String(value1Cipher);
        }

        ICryptoTransform decrypt = rijm.CreateDecryptor(keyByteArray, null);

        using (decrypt)
        {
           decryptedValue1 = DecryptData(decrypt, encryptedValue1); //string
           decryptedValue2 = DecryptData(decrypt, encrpytedValue2); //string
        }
        //... Do something with the values here.
    }
    private byte[] EncryptData(ICryptoTransform encrypt, string text)
    {
        var stream = new MemoryStream();
        using (var cryptoStream = new CryptoStream(stream, encrypt, CryptoStreamMode.Write))
        {
            using (var writer = new StreamWriter(cryptoStream))
            {
                writer.Write(text);

            }
        }
        return stream.ToArray();
    }

    private string DecryptData(ICryptoTransform decrypt, string cipherText)
    {
        string decryptedText = null;
            byte[] text = Convert.FromBase64String(cipherText);
            using (MemoryStream msDecrypt = new MemoryStream(text))
            using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decrypt, CryptoStreamMode.Read))
            using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                decryptedText = srDecrypt.ReadToEnd();

        return decryptedText;
    }

Answer 1

使用无参数CreateEncryptor() / CreateDecryptor()方法，或传递IV。如果您使用no-param版本，则应拨打CreateIV并将结果值存储在.IV中。

在.NET中使用AES加密填充问题

1 个答案: