在WinRT / Metro中增量哈希 [英] Incremental Hashing in WinRT/Metro

问题描述

我移植了一些使用增量SHA-1的代码：

I'm porting some code that uses incremental SHA-1 heavily:

SHA1 hasher = HashAlgoFactory.Create<SHA1>();
hasher.Initialize();

DiskIOCallback readCallback = null; 
readCallback = delegate(bool successful) {

if (successful)
    hasher.TransformBlock(hashBuffer, 0, count, hashBuffer, 0);
    offset += count;

if (!successful || offset == endOffset)
{
    object hash = null;
    if (successful)
    {
        hasher.TransformFinalBlock(hashBuffer, 0, 0);
        hash = hasher.Hash;
    }

我正在寻找一个WinRT /我已经使用hasher.HashData之前;有没有一些相对简单的方法从HashData获取增量行为，或者一些替代实现与上述相同的功能（在WinRT / Metro方式）？这完全可能是我缺少明显的东西...

And am looking for a WinRT/Metro equivalent. I've used hasher.HashData before; is there some relatively simple way to get incremental behaviour out of HashData, or some alternative that implements the same functionality as above (in a WinRT/Metro way)? It's entirely possible I'm missing something obvious...

推荐答案

你应该使用 CryptographicHash 类：

var hashProvider = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha1);
var hasher = hashProvider.CreateHash();

您可以附加多个增量的数据：

You can append multiple increments of data:

hasher.Append(bytesPart.AsBuffer());

完成后，您可以检索散列：

Once you're done, you retrieve the hash:

var hash = hasher.GetValueAndReset().ToArray();

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