Decrypt MIME with PFX

Demonstrates how to decrypt MIME using a PFX (containing a digital certificate with private key). The content-type of an encrypted MIME message looks like this:

Content-Type: application/x-pkcs7-mime;
	name="smime.p7m"

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 "Failed to unlock component" + "\n"
    exit
end

success = mime.LoadMimeFile("encryptedEmail.eml")
if (success != true)
    print mime.lastErrorText() + "\n";
    exit
end

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

#  Find the certificate by email address.  There are many
#  ways to find certificates within a Chilkat certificate store
#  object...

# cert is a CkCert
cert = certStore.FindCertBySubjectE("support@chilkatsoft.com")
if (cert == nil )
    print certStore.lastErrorText() + "\n";
    exit
end

# privKey is a CkPrivateKey
privKey = cert.ExportPrivateKey()
if (privKey == nil )
    print cert.lastErrorText() + "\n";

    exit
end

success = mime.Decrypt2(cert,privKey)
if (success != true)
    print mime.lastErrorText() + "\n";
    exit
end

#  Show the decrypted MIME:
print mime.getMime() + "\n";