hmac 512

var crypto = require('crypto');

var server_seed = 'qTGlqBvPdx.sUlKFIlv2DpZKamLE2q8gpoXazTDXz.YIPlWBfCrTo_WR13ieUMwE';
var client_seed = '0000201572';
var nonce = 1;
var count = 1;

while (true) {
    var hash = crypto.createHmac('sha512', server_seed).update(client_seed + ':' + nonce.toString()).digest('hex').substring(0, 1);
    if (hash == '0') {
        console.log('  0', nonce);
        if (count++ == 1e2) break;
    } else if (hash == 'f') {
        console.log('  1', nonce);
        if (count++ == 1e2) break;

    }

    nonce++;
}