(Ruby) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

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.

pdf = Chilkat::CkPdf.new()

# Load a PDF that has cryptographic signatures to be validated
success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
if (success == false)
    print pdf.lastErrorText() + "\n";
    exit
end

# Each time we verify a signature, information about the signature is written into
# sigInfo (replacing whatever sigInfo previously contained).
sigInfo = Chilkat::CkJsonObject.new()

# Iterate over each signature and validate each.
numSignatures = pdf.get_NumSignatures()
validated = false
cert = Chilkat::CkCert.new()
i = 0
while i < numSignatures
    validated = pdf.VerifySignature(i,sigInfo)
    print "Signature " + i.to_s() + " validated: " + validated.to_s() + "\n";

    # The GetSignerCert method was added in Chilkat v9.5.0.87
    # After calling VerifySignature, you can get the signer certificate by calling
    # GetSignerCert with the same index. 
    success = pdf.GetSignerCert(i,cert)
    if (success != false)
        print "PDF signer certificate: " + cert.subjectDN() + "\n";
    end

    i = i + 1
end

print "Finished." + "\n";