var crypto = require('crypto')
function base64URLEncode(str) {
return str.toString('base64')
.replace(/\+/g, '-')
.replace(/\//g, '_')
.replace(/=/g, '');
}
var verifier = base64URLEncode(
crypto.randomBytes(32)
);
console.log("verifier: " + verifier);
function sha256(buffer) {
return crypto
.createHash('sha256')
.update(buffer)
.digest();
}
var challenge = base64URLEncode(
sha256(verifier)
);
console.log("challenge: " + challenge);
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