SignatureDoesNotMatch about aws-lib

[bluepuma77]

I had the same issue with this library, this is a quick fix.

In lib/aws.js replace

    for(var n in keys) {
      var key = keys[n]
      sorted[key] = query[key]
    }

with

    for (var i=0; i<keys.length; i++) {
      var key = keys[i];
      sorted[key] = query[key];
    }