/*
    This file is part of ethereum.js.

    ethereum.js is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    ethereum.js is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.
*/
/** 
 * @file sha3.js
 * @author Marek Kotewicz <marek@ethdev.com>
 * @date 2015
 */

var utils = require('./utils');
var sha3 = require('crypto-js/sha3');

module.exports = function (str, isNew) {
    if (str.substr(0, 2) === '0x' && !isNew) {
        console.warn('requirement of using web3.fromAscii before sha3 is deprecated');
        console.warn('new usage: \'web3.sha3("hello")\'');
        console.warn('see https://github.com/ethereum/web3.js/pull/205');
        console.warn('if you need to hash hex value, you can do \'sha3("0xfff", true)\'');
        str = utils.toAscii(str);
    }

    return sha3(str, {
        outputLength: 256
    }).toString();
};