exlim/cyberchef
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix: compute sha256 hash using online algorithm

Browse Source 
No need to read the entire file in memory
This commit is contained in:
Bart van Andel 2026-07-31 13:03:18 +02:00
parent 567befebaf
commit 0cca50dec2
1 changed files with 15 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
Gruntfile.js
View File

@ -75,17 +75,23 @@ module.exports = function (grunt) {
});
grunt.registerTask("calcDownloadHash", "Compute download hash", function () {
const computeDigest = p => {
const content = fs.readFileSync(p);
const hash = crypto.hash("sha256", content);
return hash;
};
const done = this.async();
const digest = computeDigest(`build/prod/${downloadZipFilename}`);
fs.writeFileSync("build/prod/sha256digest.txt", `${digest}\n`, { encoding: "utf8" });
const hash = crypto.createHash("sha256");
const index = fs.readFileSync("build/prod/index.html", { encoding: "utf8" });
fs.writeFileSync("build/prod/index.html", index.replace(/DOWNLOAD_HASH_PLACEHOLDER/g, digest), { encoding: "utf8" });
// Use online algorithm to calculate hash, prevents reading the entire 75+ MB zip file into memory
fs.createReadStream(`build/prod/${downloadZipFilename}`)
.on("data", (chunk) => hash.update(chunk))
.on("end", () => {
const digest = hash.digest("hex");
fs.writeFileSync("build/prod/sha256digest.txt", `${digest}\n`, { encoding: "utf8" });
const index = fs.readFileSync("build/prod/index.html", { encoding: "utf8" });
fs.writeFileSync("build/prod/index.html", index.replace(/DOWNLOAD_HASH_PLACEHOLDER/g, digest), { encoding: "utf8" });
done(true);
})
.on("error", (err) => done(false));
});