Question

我将这段旧代码剪掉，应翻译成使用新的CryptographicEngine。但是我对新API的可能性感到不知所措。

有人可以帮助我吗？

    private AesManaged GetAes(string textkey)
    {
        var aes = new AesManaged();
        aes.IV = new byte[16] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        var key = System.Text.Encoding.UTF8.GetBytes(textkey);
        aes.Key = key;
        return aes;
    }

    private string DecryptValue(string input, string textkey)
    {
        var bytes = Convert.FromBase64String(input);
        var decryptedString = new StringBuilder();
        var aes = GetAes(textkey);
        var decryptor = aes.CreateDecryptor();
        using (MemoryStream msDecrypt = new MemoryStream(bytes))
        {
            using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
            {
                using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                {
                    while (!srDecrypt.EndOfStream)
                    {
                        decryptedString.Append(srDecrypt.ReadLine());
                    }
                }
            }
        }
        return decryptedString.ToString();
    }

这是我到目前为止所尝试过的。但它似乎有些问题。我总是得到

Exception = {System.Exception: Data error (cyclic redundancy check). (Exception from HRESULT: 0x80070017) at Windows.Security.Cryptography.Core.CryptographicEngine.Decrypt(CryptographicKey key, IBuffer data, IBuffer iv) at ...

    private string DecryptValue(string input, string textkey)
    {
        // Load the alghorithm providers
        var symmetricKeyProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesCbcPkcs7);

        // Create the symmetric key that is used to encrypt the string from random keystring
        var cryptoKey = symmetricKeyProvider.CreateSymmetricKey(CryptographicBuffer.DecodeFromBase64String(textkey));

        // Decode the input Base64 string
        var buffer = CryptographicBuffer.DecodeFromBase64String(input);

        // Declare new byte array
        byte[] dectryptedBytes;

        // Decrypt the IBuffer back to byte array
        CryptographicBuffer.CopyToByteArray(CryptographicEngine.Decrypt(cryptoKey, buffer, null), out dectryptedBytes);

        // Get string back from the byte array
        var decryptedString = Encoding.UTF8.GetString(dectryptedBytes, 0, dectryptedBytes.Length);

        // Return plain text
        return decryptedString;
    }

Answer 1

好的，我终于得到了它。如果有人感兴趣，这就是解决方案：

    private string DecryptValue(string input, string textkey)
    {
        // Declare the static initialization vector
        var iv = new byte[16] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

        // Convert the properties to required buffers
        var pwBuffer = CryptographicBuffer.ConvertStringToBinary(textkey, BinaryStringEncoding.Utf8);
        var saltBuffer = CryptographicBuffer.CreateFromByteArray(iv);
        var buffer = CryptographicBuffer.DecodeFromBase64String(input);

        // Load the alghorithm providers
        var symmetricKeyProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm("AES_CBC");

        // Create the symmetric key that is used to encrypt the string from IV
        var cryptoKey = symmetricKeyProvider.CreateSymmetricKey(pwBuffer);

        // Decrypt the IBuffer back to byte array
        var resultBuffer = CryptographicEngine.Decrypt(cryptoKey, buffer, saltBuffer);

        // Get string back from the byte array
        var decryptedString = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, resultBuffer);

        // Return plain text
        return decryptedString;
    }

将AesManaged翻译成新的通用应用程序CryptographicEngine

1 个答案: