calculate_sha512.js

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

function hashFile (file, algorithm = 'sha512', encoding = 'base64', options) {
    return new Promise((resolve, reject) => {
        const hash = crypto.createHash(algorithm);
        hash.on('error', reject).setEncoding(encoding);
        fs.createReadStream(
            file,
            Object.assign({}, options, {
                highWaterMark: 1024 * 1024,
                /* better to use more memory but hash faster */
            })
        )
            .on('error', reject)
            .on('end', () => {
                hash.end();
                console.log('hash done for '+ file);
                console.log(hash.read());
                console.log();
                resolve(hash.read());
            })
            .pipe(
                hash,
                {
                    end: false,
                }
            );
    });
}

fs.readdir(__dirname, (err, files) => {
    files.forEach(file => {
        hashFile(file);
    });
});