在Windows应用商店中使用hmacsha256 [英] Working with hmacsha256 in windows store app

问题描述

我正在将Windows Phone 7.1应用程式迁移/转换/重建到Windows 8商店应用程式。

I'm migrating/converting/rebuilding a Windows Phone 7.1 app to a Windows 8 Store App.

我在de WP7应用程式中使用的一种方法是给我麻烦：

One method I am using in de WP7 app is giving me trouble:

private byte[] GetSHA256Key(string data, string secretKey)
{
    byte[] value = Encoding.UTF8.GetBytes(data);
    byte[] secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);

    HMACSHA256 hmacsha256 = new HMACSHA256(secretKeyBytes);

    byte[] resultBytes = hmacsha256.ComputeHash(value);

    return resultBytes;
}

查看Windows商店应用程序的文档我想出了这个新代码我希望会给出相同的结果。但不是。我做错了。但是什么？

Looking at the documentation for Windows Store Apps I came up with this new code which I hoped would give the same result. But, no. I'm doing something wrong. But what?

private byte[] GetSHA256Key(string value, string secretKey)
{
        // Create a MacAlgorithmProvider object for the specified algorithm.
        MacAlgorithmProvider objMacProv = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha256);

        // Create a buffer that contains the message to be signed.
        IBuffer valueBuffer = CryptographicBuffer.ConvertStringToBinary(value, BinaryStringEncoding.Utf8);

        // Create a key to be signed with the message.
        IBuffer buffKeyMaterial = CryptographicBuffer.ConvertStringToBinary(secretKey, BinaryStringEncoding.Utf8);
        CryptographicKey cryptographicKey = objMacProv.CreateKey(buffKeyMaterial);

        // Sign the key and message together.
        IBuffer bufferProtected = CryptographicEngine.Sign(cryptographicKey, valueBuffer);

        DataReader dataReader = DataReader.FromBuffer(bufferProtected);
        byte[] bytes = new byte[bufferProtected.Length];
        dataReader.ReadBytes(bytes);

        return bytes;
}

我不是密码学方面的专家。我不知道我在做什么。也许有人可以帮助我。

I'm not an expert on Cryptography. I'm not sure what I'm doing. Maybe there is somebody out there who can help me.

Thanx，
JP

Thanx, JP

推荐答案

using System.Runtime.InteropServices.WindowsRuntime;

private string GetSHA256Key(byte[] secretKey, string value)
{
    var objMacProv = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha256);
    var hash = objMacProv.CreateHash(secretKey.AsBuffer());
    hash.Append(CryptographicBuffer.ConvertStringToBinary(value, BinaryStringEncoding.Utf8));
    return CryptographicBuffer.EncodeToBase64String(hash.GetValueAndReset());
}

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