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.

Downloads for Windows/Linux and Install Instructions

require 'chilkat'

crypt = Chilkat::CkCrypt2.new()

#  Any string argument automatically begins the 30-day trial.
success = crypt.UnlockComponent("30-day trial")
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

#  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 (cert == nil )
    print "Failed to find certificate by subject common name." + "\n";
    exit
end

#  Tell the crypt component to use this cert.
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"