(Ruby) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML signature.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

sbXml = Chilkat::CkStringBuilder.new()

# Load XML containing one or more signatures.
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml","utf-8")
if (success == false)
    print "Failed to load the XML file.." + "\n";
    exit
end

dsig = Chilkat::CkXmlDSig.new()

# First load the XML containing the signatures to be verified.
# Note that this particular Signature already contains the RSA public key that will be used
# for verification.
success = dsig.LoadSignatureSb(sbXml)
if (success != true)
    print dsig.lastErrorText() + "\n";
    exit
end

# For each signature, verify and also get the certificate(s) contained within each Signature.
i = 0
saCerts = Chilkat::CkStringArray.new()
cert = Chilkat::CkCert.new()

print "numSignatures = " + dsig.get_NumSignatures().to_s() + "\n";

while i < dsig.get_NumSignatures()
    # Select the Nth signature by setting the Selector property.
    dsig.put_Selector(i)

    bVerifyReferenceDigests = true
    bVerified = dsig.VerifySignature(bVerifyReferenceDigests)
    print "Signature " + (i + 1).to_s() + " verified = " + bVerified.to_s() + "\n";

    # Get the certificates embedded in this signature.
    saCerts.Clear()
    success = dsig.GetCerts(saCerts)
    if (success == true)
        j = 0
        while j < saCerts.get_Count()
            success = cert.LoadFromBase64(saCerts.getString(j))
            if (success == true)
                print "    " + cert.subjectDN() + "\n";
            end

            j = j + 1
        end
    end

    i = i + 1
end