(CkPython) Extract PKCS7 from MIME and Decrypt

Extracts the base64-encoded PKCS7 body of a MIME message to a file, and then decrypts using Chilkat Crypt2.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

mime = chilkat.CkMime()

success = mime.LoadMimeFile("c:/aaworkarea/EmailInBytes.txt")
if (success != True):
    print(mime.lastErrorText())
    sys.exit()

success = mime.SaveBody("c:/aaworkarea/smime.p7m")
if (success != True):
    print(mime.lastErrorText())
    sys.exit()

crypt = chilkat.CkCrypt2()

success = crypt.AddPfxSourceFile("c:/aaworkarea/my.pfx","pfxPassword")
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

# Indicate the public-key (PKCS7) encryption/decryption should be used:
crypt.put_CryptAlgorithm("pki")

inPath = "c:/aaworkarea/smime.p7m"
outPath = "c:/aaworkarea/decrypted.dat"

success = crypt.CkDecryptFile(inPath,outPath)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

print("Success.")