把檔案利用 sha256 來計算 hash 值 利用 js 或 node.js

node 走 shell 去獲得 sha256

Google 兩套關鍵字「 node shell command 」和「 sha256 terminal 」

https://stackoverflow.com/questions/3358420/generating-a-sha256-from-the-linux-command-line

https://www.npmjs.com/package/shelljs

或者用這個

https://www.hacksparrow.com/how-to-generate-md5-sha1-sha512-sha256-checksum-hashes-in-node-js.html

var crypto = require('crypto');
var fs = require('fs');

// change the algo to sha1, sha256 etc according to your requirements
var algo = 'md5';
var shasum = crypto.createHash(algo);

var file = './kitten.jpg';
var s = fs.ReadStream(file);
s.on('data', function(d) { shasum.update(d); });
s.on('end', function() {
var d = shasum.digest('hex');
console.log(d);
});