(CkPython) openssl smime -encrypt -des3 -in

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OpenSSL SMIME encrypt file using PEM containing a certificate.

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

# Load the cert from a PEM file.

pem = chilkat.CkPem()
# Our particular PEM was not encrypted, so we pass an empty password.
# Also, a private key is not needed for encryption.  The PEM used to test this example
# happens to have a private key, but it's not actually used.
success = pem.LoadPemFile("qa_data/openssl/rsaCertAndKey.pem","")
if (success == False):
    print(pem.lastErrorText())
    sys.exit()

if (pem.get_NumCerts() == 0):
    print("PEM does not contain any certificates.")
    sys.exit()

# cert is a CkCert
cert = pem.GetCert(0)
if (pem.get_LastMethodSuccess() == False):
    print(pem.lastErrorText())
    sys.exit()

# -------------------------------------------------------------------------------------
# Duplicate this OpenSSL command:   openssl smime -encrypt -des3 -in <file> <pem file>
# -------------------------------------------------------------------------------------
crypt = chilkat.CkCrypt2()
success = crypt.SetEncryptCert(cert)
if (success == False):
    print(crypt.lastErrorText())

    sys.exit()

crypt.put_CryptAlgorithm("PKI")
crypt.put_Pkcs7CryptAlg("3des")
crypt.put_KeyLength(168)

# Load the file to be encrypted.
bd = chilkat.CkBinData()
success = bd.LoadFile("qa_data/openssl/hello.txt")
if (success == False):
    print("Failed to load the input file.")
    sys.exit()

# Encrypt.
success = crypt.EncryptBd(bd)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

# The openssl smime -encrypt command produces encrypte MIME such as this:

# MIME-Version: 1.0
# Content-Disposition: attachment; filename="smime.p7m"
# Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name="smime.p7m"
# Content-Transfer-Encoding: base64
# 
# MIICzwYJKoZIhvcNAQcDoIICwDCCArwCAQAxggF8MIIBeAIBADBgMEoxCzAJBgNVBAYTAlVTMRYw
# FAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQDExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBY
# MwISA9Nqgb1dH/XTDNeKzN1nR85iMA0GCSqGSIb3DQEBAQUABIIBAIQqPexjxWovgxwKV/r3HL/U
# EP9Yozvz5hBeX5VvRZjKSi4FRw5wapElPK+4FB82hiAR9Mi3c16PvPSVkJv3l78Mv5uaaOs/OmUz
# mIHFB6Z+l2E52BDmUVWJZTQ09vdWy6+NIRlg2R9Z1NkmZ4BZCJk6mHB/Yx03IaOxK8LnwieDMthM
# SvxbhJnIOISN7k7ofs+/0vTXUpdQ+tlmwyVySMGQ6VMk+z4sqZJ2stacqCPtt/aiSwJ9p0OKmihf
# 3KDJceXJtavIQeA97yz1LqPvle35mmd5sBhV9qQYdTV/KJ+YM5uEZ9BHYbvMJbADFHwKzhcEY3qA
# 7T9acmEsb7NycOIwggE1BgkqhkiG9w0BBwEwFAYIKoZIhvcNAwcECERX/ZoHweSkgIIBEMmCMx49
# zjVAnGqRaBbvzQT1hg0uQSxIJjxMxC+HSuM+eY9oSOsbrw4uIijHKH9NdOpeDsdRzg2z5EBM7AlP
# Ht9DyPW5C2deV6RPX4F8gyExz+JUXrd+3Yb3AKTdpDkTWDmNCeO0r/YSqp518+mfU5hG8e336u51
# HAM44FeknA8oThWsD/wUB1e8vzsatK4UXW/KSu/166V7z+VT86kd+IHa7t60U9Yp0ZXgcM5Pb5Ni
# 69Qc5MKPzom2801H5UR/WjCgsxOIjOj49sKisjRy79skrJzxY5ZG05T0dKn6KC3TjRpIEEeOyhCd
# Nm2Y7dcW8GLMepdhWay5vePmQxmvmhbAtBprIem14NcrYeG6D5wP

# We have the body in bd
# Construct the header and base64 body...
sbEncryptedMime = chilkat.CkStringBuilder()

sbEncryptedMime.AppendLine("MIME-Version: 1.0",True)
sbEncryptedMime.AppendLine("Content-Disposition: attachment; filename=\"smime.p7m\"",True)
sbEncryptedMime.AppendLine("Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name=\"smime.p7m\"",True)
sbEncryptedMime.AppendLine("Content-Transfer-Encoding: base64",True)
sbEncryptedMime.AppendLine("",True)
sbEncryptedMime.AppendLine(bd.getEncoded("base64_mime"),True)

# Show the result.
print(sbEncryptedMime.getAsString())

# or save to a file..
success = sbEncryptedMime.WriteFile("qa_output/encryptedMime.txt","utf-8",False)