Add S/MIME Signature using PFX

Add a digital signature to a MIME message using the certificate + private key from a PFX file.

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'

mime = Chilkat::CkMime.new()

success = mime.UnlockComponent("Anything for 30-day trial")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Load a PFX file into a certificate object.
cert = Chilkat::CkCert.new()
pfxFilepath = "pfxFiles/something.pfx"
pfxPassword = "secret"
success = cert.LoadPfxFile(pfxFilepath,pfxPassword)
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

mime.SetBodyFromPlainText("This is the plain-text MIME body.")

mime.put_Charset("utf-8")
mime.put_Encoding("quoted-printable")

#  Sign the MIME:
success = mime.AddDetachedSignature(cert)
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Save the S/MIME to a file.
success = mime.SaveMime("c:/temp/signedMime.txt")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

print "success!" + "\n"