CkPython

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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import sys
import 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()
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()
success = cert.LoadFromFile("qa_data/certs/recipient.cer")
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

success = email.AddEncryptCert(cert)
if (success == False):
    print(email.lastErrorText())
    sys.exit()

#  Request encrypted sending.
email.put_SendEncrypted(True)

print("Added the recipient's encryption certificate.")

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