var crypto = require('crypto');
var twilio = 'this-is-always-the-same';
var target = 'this-comes-from-the-message-either-to-or-from-whichever-isnt-the-twilio-number';
var data = new Buffer.from(`${twilio}${target}`);
var hash = crypto.createHash('sha1');
hash.update(data);
var result = hash.digest('hex');
console.log(result.length);
console.log(result);