(Ruby) Sign a File to Create a .p7m File (using a PFX)

Ruby example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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.

crypt = Chilkat::CkCrypt2.new()

# Use a digital certificate and private key from a PFX file (.pfx or .p12).
signingCertSubject = "Acme Inc"
pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx"
pfxPassword = "test123"

certStore = Chilkat::CkCertStore.new()
success = certStore.LoadPfxFile(pfxFilename,pfxPassword)
if (success != true)
    print certStore.lastErrorText() + "\n";
    exit
end

# cert is a CkCert
cert = certStore.FindCertBySubjectCN(signingCertSubject)
if (certStore.get_LastMethodSuccess() == false)
    print "Failed to find certificate by subject common name." + "\n";
    exit
end

# Tell the crypt component to use this cert.
success = crypt.SetSigningCert(cert)

# We can sign any type of file, creating a .p7m as output:
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
outputFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m"
success = crypt.CreateP7M(inFile,outputFile)
if (success == false)
    print crypt.lastErrorText() + "\n";

    exit
end

# Verify and restore the original file:
success = crypt.SetVerifyCert(cert)

inFile = outputFile
outputFile = "/Users/chilkat/testData/pdf/restored.pdf"

success = crypt.VerifyP7M(inFile,outputFile)
if (success == false)
    print crypt.lastErrorText() + "\n";

    exit
end

print "Success!" + "\n";