CkPython

Add a PFX Source (BinData) for S/MIME Decryption

Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

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import sys
import chilkat

success = False

#  Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
#  source of certificates and private keys for S/MIME decryption.  The 1st argument is the
#  BinData containing the PFX, and the 2nd is the PFX password.

imap = chilkat.CkImap()

imap.put_Ssl(True)
imap.put_Port(993)

success = imap.Connect("imap.example.com")
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

success = imap.Login("user@example.com","myPassword")
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

#  Load the PFX data into a BinData.
bdPfx = chilkat.CkBinData()
success = bdPfx.LoadFile("qa_data/smime.pfx")
if (success == False):
    print(bdPfx.lastErrorText())
    sys.exit()

#  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
#  interactive prompt, environment variable, or a secrets vault.

#  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
success = imap.AddPfxSourceBd(bdPfx,pfxPassword)
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

#  Messages downloaded after this are automatically decrypted when a matching key is found.

success = imap.Disconnect()
if (success == False):
    print(imap.lastErrorText())
    sys.exit()