I'm trying to make a hash of a file, through Crypto-JS
.
The idea is to make a hash of the first bytes (ie from 10
to 100
).
The result is not the same in Safari (last), as in Chrome & Firefox (both last): any idea about what's wrong in Safari?
Hash function
const hashthefile = (filetoHash) => {
return new Promise((resolve, reject) => {
var start = 10;
var stop = 100;
// set reading operations through the FileReader API
var reader = new FileReader();
reader.onloadend = function(event) {
// when the entire read request has been completed
if (event.target.readyState == FileReader.DONE) {
var data = event.target.result;
var encrypted = CryptoJS.SHA256(data).toString();
resolve(encrypted);
}
}
// handle error
reader.onerror = function(event) {
reject('reading error')
};
// slice the file according to first and last bytes defined
// complete API there: https://developer.mozilla.org/en-US/docs/Web/API/Blob/slice
var blob = filetoHash.slice(start, stop + 2);
// launch the file sliced reading as a base64 encoded string
reader.readAsDataURL(blob);
});
}
I think I figure out how to have a consistent hash across Chrome, Firefox & Safari :
readAsDataURL
readAsArrayBuffer
Open to more advices and precisions of wiser coders (still don't know why using readAsDataURL
produce a Safari-specific result).
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