/*
cryptojs v3.1.2
code.google.com/p/crypto-js
(c) 2009-2013 by jeff mott. all rights reserved.
code.google.com/p/crypto-jsx/wiki/license
*/
/**
 * zero padding strategy.
 */
cryptojs.pad.zeropadding = {
    pad: function (data, blocksize) {
        // shortcut
        var blocksizebytes = blocksize * 4;

        // pad
        data.clamp();
        data.sigbytes += blocksizebytes - ((data.sigbytes % blocksizebytes) || blocksizebytes);
    },

    unpad: function (data) {
        // shortcut
        var datawords = data.words;

        // unpad
        var i = data.sigbytes - 1;
        while (!((datawords[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff)) {
            i--;
        }
        data.sigbytes = i + 1;
    }
};