node-uuid.js

const crypto = require( 'crypto' );

module.exports = {
	UUIDv4(){
		let random_num = crypto.randomBytes(16);
		random_num[6] = (random_num[6] & 0x0f) | 0x40;
		random_num[8] = (random_num[8] & 0x3f) | 0x80;
		
		return [
			random_num.slice(0, 4).toString('hex'),
			random_num.slice(4, 6).toString('hex'),
			random_num.slice(6, 8).toString('hex'),
			random_num.slice(8, 10).toString('hex'),
			random_num.slice(10, 16).toString('hex')
		].join('-').toUpperCase();
	},
	_UUIDv35( version, value, namespace ) {
		let val = Buffer.from(value);
		let ns  = Buffer.from(namespace);
		
		
		let bytes = crypto.createHash(version === 3 ? 'md5' : 'sha1').update(Buffer.concat([ns, val])).digest();
		bytes[6] = (bytes[6] & 0x0f) | 0x50;
		bytes[8] = (bytes[8] & 0x3f) | 0x80;
		
		return [
			bytes.slice( 0,  4).toString('hex'),
			bytes.slice( 4,  6).toString('hex'),
			bytes.slice( 6,  8).toString('hex'),
			bytes.slice( 8, 10).toString('hex'),
			bytes.slice(10, 16).toString('hex')
		].join('-').toUpperCase();
	},
	UUIDv3(...args){ return this._UUIDv35(3, ...args); },
	UUIDv5(...args){ return this._UUIDv35(5, ...args); },
};