Create S/MIME Detached Signature with PFX

How to use a PFX to create a signed S/MIME message.

Download Chilkat Ruby Library

require 'chilkat'


mime = Chilkat::CkMime.new()

success = mime.UnlockComponent("Anything for 30-day trial")
if (success == false)
    print "Failed to unlock component" + "\n"
    exit
end

mime.AddHeaderField("Subject","This is a test")
mime.AddHeaderField("Abc","123")

mime.SetBodyFromPlainText("This is the body")

certStore = Chilkat::CkCertStore.new()

password = "myPassword"
success = certStore.LoadPfxFile("chilkat.pfx",password)
if (success == false)
    print certStore.lastErrorText() + "\n"
    exit
end

cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.")
if (cert == nil )
    print "Failed to find certificate!" + "\n"
    exit
end

#  Display the full distinguished name of the cert.
print cert.subjectDN() + "\n";

success = mime.AddDetachedSignature(cert)
if (success == false)
    print mime.lastErrorText() + "\n"
    exit
end

print mime.getMime() + "\n";