文件与文件内容作为WordArray的不同sha256哈希值 [英] different sha256 hash value of file vs. file contents as WordArray
问题描述
我做了一个测试文本文件，内容是: aaaaaaaabbbbbbbbccccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhh
I made a test text file, the contents are:
aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhh
此值作为字符串的sha256十六进制摘要为: 75eef9680de51f6f70291057e9afc5975470960dfec5f37f83db69aa625786e5
The sha256 hex digest for this value as a string is:
75eef9680de51f6f70291057e9afc5975470960dfec5f37f83db69aa625786e5
在Python中使用hashlib，在js中使用Crypto.js或从命令行在文件上使用ssl对其进行哈希处理时，会得到相同的值.
I get this same value when hashing it in python using hashlib, js using Crypto.js, or using ssl on the file from the command line.
但是，在js中，当我这样读取文件时:
however, in js, when I read the file in like this:
var fr = new FileReader();
fr.readAsArrayBuffer(file);
console.log(fr.result.byteLength); // it's 64...
var input = CryptoJS.lib.WordArray.create(new Uint8Array(fr.result));
CryptoJS.SHA256(input).toString();
我得到: 8f76bf13468fb12ac4e59610adff70fd10282e8494a2749db4677f81e2c6e998
更新:来自crypto.js文档:
UPDATE: from the crypto.js docs:
/**
* cryptojs use WordArray (CryptoJS.lib.WordArray) as parameter/result frequently.
* A WordArray object represents an array of 32-bit words. When you pass a string,
* it's automatically converted to a WordArray encoded as UTF-8.
*/
怀疑它可能是utf-8 vs ascii之类的东西，或类似的东西，但不知道如何检查.
suspecting it could be a utf-8 vs ascii thing, or something like that, but have no idea how to check.
推荐答案
我发现 asmCrypto.js 接受ArrayBuffers和Uint8Arrays作为输入-我现在得到了预期的结果(它也非常快).我这样使用它:
I found asmCrypto.js which accepts both ArrayBuffers and Uint8Arrays as input - I'm now getting the expected result (It's also pretty fast). I use it like this:
var fr = new FileReader();
fr.readAsArrayBuffer(file);
console.log(fr.result.byteLength); // it's still 64...
asmCrypto.SHA256.hex(new Uint8Array(fr.result));
asmCrypto.SHA256.hex(fr.result); // this also works
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