Validate a MaxCoin address

maxcoin-validator.js

// node imports
var sys = require('sys');
var base58 = require('bs58');
var SHA3 = require('sha3');

// validation function
function validateAddress(address) {
    // network/version byte
    var version = address.substring(0, 1);
    if (version != 'm') return false;

    // decode
    var decoded = base58.decode(address);

    // check length
    if (decoded.length != 25) return false;

    // checksum
    var checksum = new Buffer(4);
    decoded.copy(checksum, 0, decoded.length - 4);
    var rest = new Buffer(decoded.length - 4);
    decoded.copy(rest, 0, 0, decoded.length - 4);
    
    var start = rest.slice(0, 4);
    //var start = new Buffer(4);
    //rest.copy(start, 0, 0, 4);

    var d = new SHA3.SHA3Hash(256);
    d.update(start);

    // THIS IS CORRECT
    sys.puts(start);
    sys.puts(base58.encode(start));
    sys.puts(start.length);

    // THIS IS CORRECT
    sys.puts(checksum);
    sys.puts(base58.encode(checksum));
    sys.puts(checksum.length);

    // I NEED THE FIRST 4 BYTES ONLY...
    var checksum2 = new Buffer(4);
    var hash = d.digest('binary');
    sys.puts(hash);
    checksum2 = hash.slice(0, 4);
    console.log(checksum2);

    sys.puts(checksum2); // NOPE
    sys.puts("checksum2:"+base58.encode(checksum2)); // NOPE
    sys.puts(checksum2.length); // NOPE

    if (checksum2 != checksum) return false;
    
    return true;
}

// Validate an address
var address = "mQ1MSBXTRvV4ArwDksPiUBLWCmt7t9AkDi";
sys.puts(validateAddress(address));