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(Chilkat2-Python) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Chilkat2 Python Downloads

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.

mime = chilkat2.Mime()

# Load a certificate w/ private key for signing.
# There are many ways of getting a certificate object:
# from a pfx file, from .cer and private-key files, from the
# Windows registry-based certificate stores, etc.
# Load a PFX file into a certificate object.
cert = chilkat2.Cert()
pfxFilepath = "pfxFiles/something.pfx"
pfxPassword = "secret"
success = cert.LoadPfxFile(pfxFilepath,pfxPassword)
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

# Create a very simple MIME message to be signed:
success = mime.AddHeaderField("Subject","This is a test")
success = mime.AddHeaderField("MyCustomHeader","abc123")
mime.ContentType = "text/plain"
mime.SetBody("This is a plain-text body.")

# Examine the MIME prior to signing:
print("--- MIME prior to signing ---")
print(mime.GetMime())

# The MIME prior to signing looks like this:
# -------------------------------------------------------------------------------

# Subject: This is a test
# MyCustomHeader: abc123
# Content-Type: text/plain
# 
# This is a plain-text body.

# -------------------------------------------------------------------------------

# The default hash algorithm used in the signing process is "SHA1".
# To change it, set the SigningHashAlg property:
mime.SigningHashAlg = "SHA256"

# Convert the MIME to PKCS7 signed-data.
success = mime.ConvertToSigned(cert)
if (success == False):
    print(mime.LastErrorText)
    sys.exit()

# Examine the signed MIME
print("--- MIME converted to PKCS7 signed-data ---")
print(mime.GetMime())

# The MIME after signing looks like this:
# -------------------------------------------------------------------------------

# Subject: This is a test
# MyCustomHeader: abc123
# Content-Disposition: attachment; filename="smime.p7m"
# Content-Transfer-Encoding: base64
# Content-Type: application/x-pkcs7-mime;
#  name="smime.p7m"; smime-type="signed-data"
# 
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# 

# ------------------------------------------------------------------------------

 

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