Question

I need to sign xml using ruby, someone know any method or lib for that?

My xml skeleton is:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Message>
    <MessageId> 
        <ServiceId>service</ServiceId> 
        <Version>1.0</Version> 
        <MsgDesc>Service Description</MsgDesc> 
        <Code>4</Code> 
        <FromAddress>from</FromAddress> 
        <ToAddress>to</ToAddress> 
        <Date>2012-10-29</Date> 
    </MessageId> 
    <MessageBody/> 

<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
  <SignedInfo>
    <CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
    <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
    <Reference URI="">
    <Transforms>
      <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
    </Transforms>
    <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
    <DigestValue>??????</DigestValue>
    </Reference>
  </SignedInfo>

  <SignatureValue>????????????</SignatureValue>
  <KeyInfo>
    <X509Data>
      <X509Certificate>????????</X509Certificate>
    </X509Data>
  </KeyInfo>
</Signature>
</message>

I tried this code for DigestValue and I have tested it, comparing it with my java example, but DigestValue is not matching with the response of my java example:

require 'base64'
require 'openssl'

to_sign_xml = File.read 'service.xml'
digest = OpenSSL::Digest::SHA1.digest(to_sign_xml)

digest = Base64.encode64(digest.to_s).gsub(/\n/, '')
raise digest.inspect

My file service.xml contain that:

<Message>
    <MessageId> 
        <ServiceId>service</ServiceId> 
        <Version>1.0</Version> 
        <MsgDesc>Service Description</MsgDesc> 
        <Code>4</Code> 
        <FromAddress>from</FromAddress> 
        <ToAddress>to</ToAddress> 
        <Date>2012-10-29</Date> 
    </MessageId> 
    <MessageBody/>
<Message>

Answer 1

If you’re still interested I made this gem a week ago. It’s still in development but the basic stuff is implemented. This gem is tested against signatures created with the xmlsec library.
http://www.aleksey.com/xmlsec/

I’m actively working with this gem at the moment so bugs should be fixed relatively quick.

https://rubygems.org/gems/xmldsig