Create Signed EML

Ruby script to create a signed email (EML file). (An EML file contains the MIME source of an email and is the default email file format saved by most email programs such as Outlook Express and Mozilla Thunderbird.)

Download Ruby Programming Example Scripts

# file: CreateSignedEml.rb

require 'chilkat'

# How to create a digitally signed email (.eml file) in Ruby
mailman = Chilkat::CkMailMan.new()
mailman.UnlockComponent("anything for 30-day trial")

# Create a simple email
email = Chilkat::CkEmail.new()
email.put_Subject("Digitally signed email created by a Ruby script")
email.put_Body("Digitally signed email created by a Ruby script")
# The signature uses the digital certificate of the sender (i.e. the email
# address in the FROM header field).
email.put_From("TagTooga <admin@tagtooga.com>")

# Add a few recipients
email.AddTo("Matt","matt@chilkatsoft.com")
email.AddTo("Support","support@chilkatsoft.com")

# There are a number of ways to create digitally signed email using Chilkat.
# This example demonstrates the easiest (other examples will explore
# some of the other possibilities).
# To send a signed email, the digital certificate matching the sender's email
# address (in the FROM header field) should have been previously be installed on your computer
# with the private key.  
# If not, you may install from a .pfx (or .p12) file.
# Double-click on the .pfx to install.  Do not check the "Enable strong private key
# protection" checkbox because if you do, programs that access the private key
# will cause the operating system to display a pop-up warning dialog to 
# notify the logged-in user of the private key access.  Otherwise, select all the
# defaults and import the certificate.
# 
# IMPORTANT: The .pfx should be imported from the same logged-in account
# under which the program will be running.  This is because private keys
# are stored by Windows within the logged-on user's "protected store".
#
# Once the PFX is installed, the Chilkat component should be able to locate
# the certificate for signing.  You only need to set the SendSigned property = true:
email.put_SendSigned(true)
    
# We can choose to create a signed email using a detached signature,
# or, if the OpaqueSigning property is set the email will use an opaque signature
# where the content of the email is not visible until the security layers are unwrapped.
mailman.put_OpaqueSigning(true)

mimeStr = Chilkat::CkString.new()
# The RenderToMime method renders the email according to the property settings
# of the email and mailman objects.
success = mailman.RenderToMime(email,mimeStr)
if not success
	mailman.SaveLastError("lastError.txt");
else
	# Convert line endings from CRLF to bare LF's
	mimeStr.toLF()
	# Save the MIME string to a file.
	aFile = File.new("signed_email.eml", "w")
	aFile.write(mimeStr.getString())
	aFile.close
end