javascript - SHA256 Hashing Large files in angular 6 using Filereader Issue
问题描述
我对 SHA256 哈希有疑问。如果文件大小超过 250 MB,它将终止浏览器并崩溃。以下是哈希码,请帮助我们。
let fileReader = new FileReader();
fileReader.readAsArrayBuffer(fileToSend);
fileReader.onload = (e) => {
const hash = CrypTo.SHA256(this.arrayBufferToWordArray(fileReader.result)).toString();
this.hashCode=hash;
this.fileHistory.MediaHash = hash;
this.fileHistory.FileName = fileToSend.name;
//Insert to file history
this.fileHistoryService.postFiles(this.fileHistory).subscribe(
data => {
this.hashCode=data["MediaHash"];
this.alertService.success('HASHFILE.FileUploadSuccessMessage', true);
this.hideGenerateHashCodeButton = true;
},
error => {
this.alertService.error('COMMONERRORMESSAGE.SomethingWentWrongErrorMessage');
});
}
arrayBufferToWordArray(fileResult) {
var i8a = new Uint8Array(fileResult);
var byteArray = [];
for (var i = 0; i < i8a.length; i += 4) {
byteArray.push(i8a[i] << 24 | i8a[i + 1] << 16 | i8a[i + 2] << 8 | i8a[i + 3]);
}
return CrypTo.lib.WordArray.create(byteArray, i8a.length);
}
解决方案
下面的代码我测试了所有大文件,修复了我的解决方案。
var hashdata = CrypTo.algo.SHA256.create();
var file =**<FiletoHash>**;
if(file){
var reader = new FileReader();
var size = file.size;
var chunk_size = Math.pow(2, 22);
var chunks = [];
var offset = 0;
var bytes = 0;
reader.onloadend = (e) =>{
if (reader.readyState == FileReader.DONE){
//every chunk read updating hash
hashdata.update(this.arrayBufferToWordArray(reader.result));
let chunk:any = reader.result;
bytes += chunk.length;
chunks.push(chunk);
if((offset < size)){
offset += chunk_size;
var blob = file.slice(offset, offset + chunk_size);
reader.readAsArrayBuffer(blob);
} else {
//use below hash for result
//finaly generating hash
var hash = hashdata.finalize().toString();
//debugger;
};
}
};
var blob = file.slice(offset, offset + chunk_size);
reader.readAsArrayBuffer(blob);
}
}
}
arrayBufferToWordArray(fileResult) {
var i8a = new Uint8Array(fileResult);
return CrypTo.lib.WordArray.create(i8a, i8a.length);
}
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