var randomBytes = require('./randomBytes');
exports = function() {
    var b = randomBytes(16);
    b[6] = (b[6] & 0x0f) | 0x40;
    b[8] = (b[8] & 0x3f) | 0x80;
    return (
        hexBytes[b[0]] +
        hexBytes[b[1]] +
        hexBytes[b[2]] +
        hexBytes[b[3]] +
        '-' +
        hexBytes[b[4]] +
        hexBytes[b[5]] +
        '-' +
        hexBytes[b[6]] +
        hexBytes[b[7]] +
        '-' +
        hexBytes[b[8]] +
        hexBytes[b[9]] +
        '-' +
        hexBytes[b[10]] +
        hexBytes[b[11]] +
        hexBytes[b[12]] +
        hexBytes[b[13]] +
        hexBytes[b[14]] +
        hexBytes[b[15]]
    );
};
var hexBytes = [];
for (var i = 0; i < 256; i++) {
    hexBytes[i] = (i + 0x100).toString(16).substr(1);
}

module.exports = exports;