CkPython

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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import sys
import chilkat

success = False

#  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
#  corresponding private key (as separate objects) for decrypting a received encrypted
#  email.  Set them before loading the encrypted email.

email = chilkat.CkEmail()

#  Load the certificate (public) and the matching private key from separate files.
cert = chilkat.CkCert()
success = cert.LoadFromFile("qa_data/certs/recipient.cer")
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

privKey = chilkat.CkPrivateKey()
success = privKey.LoadPemFile("qa_data/certs/recipient_privkey.pem")
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

#  Provide the certificate and private key to use for decryption.
success = email.SetDecryptCert2(cert,privKey)
if (success == False):
    print(email.lastErrorText())
    sys.exit()

#  Load the encrypted email; Chilkat decrypts it using the certificate and key.
success = email.LoadEml("qa_data/eml/encrypted.eml")
if (success == False):
    print(email.lastErrorText())
    sys.exit()

print("Decrypted = " + str(email.get_Decrypted()))

#  Note: Paths such as "qa_data/..." are relative local filesystem paths,
#  relative to the current working directory of the running application.