md5stor.js

#!/usr/bin/env node

var Web3 = require('web3');
var web3 = new Web3();

function getBinarySize(string) {
    return Buffer.byteLength(string, 'utf8');
}

web3.setProvider(new web3.providers.HttpProvider('http://localhost:8545'));

var fromAddress = "0xb6143608a2642b70a2c2b31f460f8511c89e3b08";
var code = "27c7650985ca463499b9e3e21bee20e7";
var hexCode = web3.toHex(code);


// how much gas?
var result = web3.eth.estimateGas({
    from: fromAddress,
    data: hexCode
});
console.log("estimated gas needed (ether): " + web3.fromWei(result, "ether"));

// do some work
console.log("md5 to go in: " + code);
console.log("hex of md5 to go in: " + hexCode);
web3.eth.sendTransaction({from: fromAddress, data: hexCode}, function(err, address) {
  if (!err) {
    //console.log(address);
    var transaction = web3.eth.getTransaction(address).input;
    console.log("hex of md5 from blockchain: " + transaction);
    console.log("md5 from blockchain: " + web3.toAscii(transaction));
  } else {
    console.log(err);
  }
});