MIME S/MIME Encryption Algorithm Properties

See more MIME Examples

Demonstrates the properties that control S/MIME encryption: Pkcs7CryptAlg (the symmetric content-encryption algorithm), Pkcs7KeyLength (the content-encryption key length in bits), OaepPadding (whether RSAES-OAEP key transport is used instead of RSAES-PKCS1-v1_5), and the OAEP hash settings OaepHash and OaepMgfHash. The properties are configured before calling Encrypt.

import sys
import chilkat2

success = False

mime = chilkat2.Mime()
success = mime.SetBodyFromPlainText("This message will be encrypted.")
if (success == False):
    print(mime.LastErrorText)
    sys.exit()

# Pkcs7CryptAlg is the symmetric content-encryption algorithm.  Supported values are aes, aes-gcm,
# des, 3des, and rc2.  The default is aes.
mime.Pkcs7CryptAlg = "aes"

# Pkcs7KeyLength is the content-encryption key length in bits.  The default is 128.
mime.Pkcs7KeyLength = 256

# OaepPadding selects the RSA key-transport padding.  The default is False (RSAES-PKCS1-v1_5).
# Set True to use RSAES-OAEP, in which case the OAEP hash settings apply.
mime.OaepPadding = True
mime.OaepHash = "sha256"
mime.OaepMgfHash = "sha256"

# Load the recipient certificate (public key is sufficient for encrypting).
cert = chilkat2.Cert()
success = cert.LoadFromFile("qa_data/recipient.cer")
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

# Encrypt using the algorithm settings configured above.
success = mime.Encrypt(cert)
if (success == False):
    print(mime.LastErrorText)
    sys.exit()

print("Encrypted with " + mime.Pkcs7CryptAlg + " " + str(mime.Pkcs7KeyLength) + "-bit key.")