Hash Test: How to produce hash output

Question

Here is a basic hash test. I am trying to reproduce the output with: http://emn178.github.io/online-tools/sha3_256.html

Is sha3-256 correct?

The output for '1' as the value input is b10e2d527612073b26eecdfd717e6a320cf44b4afac2b0732d9fcbe2b7fa0cf6 but I cannot reproduce this with the calculator.

contract HashTest {

bytes32 public hashOutput;
uint public valueOut;

function hash(uint _values) {
    var value = _values; 
    valueOut = value;
    hashOutput = sha3(value);
}

function refund() {
   msg.sender.send(this.balance);
}
}

Also I am using "var" because that is how it was provided in the blind auction example and once I can get the hash to match I will create a more complex function using var if possible.

Answer 1

In Solidity the sha3() method will use the variable type (as opposed to variable content) to determine the size of it.

uint maps to uint256 and that means in your example not the number 0x01 will be hashed, but 0x0000000000000000000000000000000000000000000000000000000000000001 is used as input. Use uint8 for an 8 bit variable (0x01).

Also as a reminder, Ethereum uses Keccak and not the final SHA3 (Why aren't Solidity sha3 hashes not matching what other sha3 libraries produce?)

Edit: sample code using ethereumjs-abi:

var ABI = require('ethereumjs-abi');
var abi = new ABI();
var BN = require('bn.js')

console.log(abi.soliditySHA3(
    [ 'uint' ],
    [ new BN('01', 16) ]
).toString('hex'));