@strongnguyen/oidc-provider/lib/helpers/calculate_thumbprint.js

OAuth 2.0 Authorization Server implementation for Node.js with OpenID Connect

const { createHash } = require('crypto');

const base64url = require('./base64url');

const normalize = (cert) => cert.replace(/(?:-----(?:BEGIN|END) CERTIFICATE-----|\s|=)/g, '');
const calculate = (hash, cert) => base64url.encodeBuffer(createHash(hash).update(Buffer.from(normalize(cert), 'base64')).digest());

module.exports.x5t = calculate.bind(undefined, 'sha1');
module.exports['x5t#S256'] = calculate.bind(undefined, 'sha256');