index.js

var Buffer = require('buffer').Buffer; // for use with browserify

module.exports = function (a, b) {
    if (!Buffer.isBuffer(a)) return undefined;
    if (!Buffer.isBuffer(b)) return undefined;
    if (typeof a.equals === 'function') return a.equals(b);
    if (a.length !== b.length) return false;
    
    for (var i = 0; i < a.length; i++) {
        if (a[i] !== b[i]) return false;
    }
    
    return true;
};