(Chilkat2-Python) Send Encrypted Email using RSAES-OAEP with AES-128 CBC and SHA256

Demonstrates how to send encrypted email using RSAES-OAEP with SHA256 and AES-128 content encryption.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

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

# Load an RSA-based certificate.
# (Encrypting an email only requires the public key.  Decrypting an email requires the private key.)
cert = chilkat2.Cert()
success = cert.LoadFromFile("qa_data/rsaes-oaep/cert.pem")
if (success != True):
    print(cert.LastErrorText)
    sys.exit()

email = chilkat2.Email()

# Create a simple email.
email.Subject = "Sample RSAES-OAEP Encrypted Email"
email.Body = "Sample RSAES-OAEP Encrypted Email"
email.From = "support@chilkatsoft.com"

# Add a recipient.
# (The email is encrypted using the recipient's certificate.
# If sending to multiple recipients, then the AddEncryptCert method would
# need to be called once for each recipient's certificate.)
email.AddTo("Chilkat GMail","chilkat.support@gmail.com")

# Set the email object properties to indicate the desired encryption.
email.Pkcs7CryptAlg = "aes"
# If AES-256 is desired, set the following property to 256.
email.Pkcs7KeyLength = 128
email.OaepPadding = True
# Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
email.OaepHash = "sha256"

# Provide the certificate to be used for encryption
email.AddEncryptCert(cert)

# Don't forget to indicate that the email should be encrypted when sent..
email.SendEncrypted = True

# The mailman object will do the RSAES-OAEP encryption when sending.
mailman = chilkat2.MailMan()

# Set the SMTP settings for your email account on your mail server.
mailman.SmtpUsername = "SMTP_LOGIN"
mailman.SmtpPassword = "SMTP_PASSWORD"
mailman.SmtpHost = "MY_SMTP_DOMAIN_OR_IP"
mailman.SmtpPort = 587
mailman.StartTLS = True

# Send the email.  The mailman will encrypt the email as directed by the 
# property settings of the email object.
success = mailman.SendEmail(email)
if (success != True):
    print(mailman.LastErrorText)
    sys.exit()

success = mailman.CloseSmtpConnection()
if (success != True):
    print("Connection to SMTP server not closed cleanly.")

print("Mail Sent!")

# -----------------------------------------------------------
# This is an example of an RSAES-OAEP encrypted email
# -----------------------------------------------------------

# MIME-Version: 1.0
# Date: Thu, 27 Apr 2017 08:43:32 -0500
# Message-ID: <772DC039F0259C474BAC60240EA2BA2272402308@CHILKAT13>
# Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
# Content-Transfer-Encoding: base64
# X-Priority: 3 (Normal)
# Subject: Sample RSAES-OAEP Encrypted Email
# From: support@chilkatsoft.com
# To: "Chilkat GMail" <chilkat.support@gmail.com>
# Content-Disposition: attachment; filename="smime.p7m"
# 
# MIICWQYJKoZIhvcNAQcDoIICSjCCAkYCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
# CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
# dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
# oA0wCwYJYIZIAWUDBAIBBIIBABr0E1dKJjK0FAYRz/NCtJmBeB0nUxgcuBnhGPI/UeyGub3cCo+K
# G5F4/iVTBJqVvYIF5+fvBnyTginwv7OiUiFWLyihiFC3NIyZJO22+XMHpNatCffTPZk10WswkTgk
# G3ApnRvGQAaldnFD0Hs8drPU4vBvY9QsjT7YDGa6u2NMX+sr1ewEZArqU0mNfJ6RsEYd5FQbFEVF
# qLmnz8Dt+yhoJlUtfUd8TXIeqHRJ7RxKOTSzlBZaAdTv2QX4oL9IcAgZeTg5iw+yRPkSAwWyg+I/
# 7fybLsUpRGDHTGUU+AvHvP0kYKa1mkvccBVEC/+4hEyhpS1tWIR5ByY6vM76Z+8wgZwGCSqGSIb3
# DQEHATAdBglghkgBZQMEAQIEEKqD0YDHX1NsVDaV32UczpeAcLteQyRPTV4hATjwcPiVelPfeWNs
# xZKRGaEBqLM8+Y+V4ciCFoOlgJuOcP4m1PTHyilfzd+SCsKz5l1C7+sfPf36n2aacX6IWga59Bz5
# QbWrOHDUT7O5PnGwKVgQFw3Cj4GrdPGWKcoqxB0HuKnj3WA=