(Ruby) Sign a File to Create a .p7s (Detached Signature)

Ruby example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

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 .p7s as output:
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
sigFile = "/Users/chilkat/testData/p7s/sample.p7s"

success = crypt.CreateP7S(inFile,sigFile)
if (success == false)
    print crypt.lastErrorText() + "\n";

    exit
end

success = crypt.VerifyP7S(inFile,sigFile)
if (success == false)
    print crypt.lastErrorText() + "\n";

    exit
end

print "Success!" + "\n";