Ruby

Specify a Certificate for Encrypted Email

Demonstrates the Chilkat Email.AddEncryptCert method, which explicitly specifies a certificate to use when sending encrypted email. Call it once per recipient certificate; ClearEncryptCerts clears the list. This example loads a recipient certificate, registers it, and enables encrypted sending.

Background: When encrypting to multiple people, each recipient needs to be able to decrypt with their own private key. S/MIME handles this by encrypting the message's one-time content key separately under each recipient's public certificate and including all of those wrapped keys in the message. AddEncryptCert is how you build that recipient list — one call per certificate — giving explicit control over exactly whose certificates are used rather than relying on automatic lookup.

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Ruby

require 'chilkat'

success = false

#  Demonstrates the AddEncryptCert method, which explicitly specifies a certificate for
#  sending encrypted email.  Call it once per recipient certificate.  Use ClearEncryptCerts
#  to clear the list.

email = Chilkat::CkEmail.new()
email.put_Subject("Encrypted email")
email.put_Body("Encrypted to the specified recipient certificate(s).")
email.put_From("alice@example.com")
email.AddTo("Bob","bob@example.com")

#  Load a recipient certificate (public key) and add it to the encryption cert list.
cert = Chilkat::CkCert.new()
success = cert.LoadFromFile("qa_data/certs/recipient.cer")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

success = email.AddEncryptCert(cert)
if (success == false)
    print email.lastErrorText() + "\n";
    exit
end

#  Request encrypted sending.
email.put_SendEncrypted(true)

print "Added the recipient's encryption certificate." + "\n";

#  Note: The path "qa_data/certs/recipient.cer" is a relative local filesystem path,
#  relative to the current working directory of the running application.