(Chilkat2-Python) Create CAdES p7m using AWS KMS to Sign in the Cloud

See more Signing in the Cloud Examples

Note: This example requires Chilkat v9.5.0.96 or greater.

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

import sys
import chilkat2

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

# Load the certificate used for signing.  The certificate's private key is stored in AWS KMS
# However, we still need the certificate locally (without private key).
cert = chilkat2.Cert()
success = cert.LoadFromFile("qa_data/certs/myCert.cer")
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

# Here's a screenshot showing the key ID of a private key in AWS KMS:


# To sign using AWS KMS, 
# add the following lines of code to specify your AWS authentication credentials,
# and the ID of the KMS private key.
jsonAwsKms = chilkat2.JsonObject()
# Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
jsonAwsKms.UpdateString("service","aws_kms")
jsonAwsKms.UpdateString("access_key","ACCESS_KEY")
jsonAwsKms.UpdateString("secret_key","SECRET_KEY")
# Make sure to specify the correct region for your case.
jsonAwsKms.UpdateString("region","us-west-2")
# In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
jsonAwsKms.UpdateString("key_id","187012e8-008f-4fc7-b100-5efe6146dff2")

success = cert.SetCloudSigner(jsonAwsKms)

crypt = chilkat2.Crypt2()

success = crypt.SetSigningCert(cert)
if (success == False):
    print(crypt.LastErrorText)
    sys.exit()

# The CadesEnabled property applies to all methods that create PKCS7 signatures. 
# To create a CAdES-BES signature, set this property equal to true.
crypt.CadesEnabled = True

crypt.HashAlgorithm = "sha256"

signedAttrs = chilkat2.JsonObject()
signedAttrs.UpdateInt("contentType",1)
signedAttrs.UpdateInt("signingTime",1)
signedAttrs.UpdateInt("messageDigest",1)
signedAttrs.UpdateInt("signingCertificateV2",1)
crypt.SigningAttributes = signedAttrs.Emit()

# You can sign any type of file..
inputXmlPath = "qa_data/e-Invoice.xml"
outputP7mPath = "qa_output/signed.p7m"

# Create the CAdES-BES attached signature, which contains the original data.
# Chilkat will build the .p7m locally, but will (internally) use ARSS
# to do the RSA signing remotely.
success = crypt.CreateP7M(inputXmlPath,outputP7mPath)
if (success == False):
    print(crypt.LastErrorText)
    sys.exit()

print("Success.")