gistfile1.js

var select = require('xml-crypto').xpath.SelectNodes
  , dom = require('xmldom').DOMParser
  , SignedXml = require('xml-crypto').SignedXml
  , FileKeyInfo = require('xml-crypto').FileKeyInfo  
  , fs = require('fs')

var xml = fs.readFileSync("signed.xml").toString()
var doc = new dom().parseFromString(xml)
var signature = select(doc, "/*/*[local-name(.)='Signature' and namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#']")[0]
var sig = new SignedXml()
sig.keyInfoProvider = new FileKeyInfo("client_public.pem")
sig.loadSignature(signature.toString())
var res = sig.checkSignature(xml)
if (!res) console.log(sig.validationErrors)