(Chilkat2-Python) Add EncapsulatedTimestamp to Already-Signed XML

See more XML Digital Signatures Examples

Demonstrates how to add an EncapsulatedTimestamp to an existing XML signature.

Note: This example requires Chilkat v9.5.0.90 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.

# Note: We cannot load the already-signed XML into a Chilkat XML object because it would re-format the XML when re-emitted.
# (i.e. indentation and whitespace could change, and it would invalidate the existing signature.)
# We must use a StringBuilder.
sbXml = chilkat2.StringBuilder()
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/encapsulatedTimestamp_not_yet_added.xml","utf-8")
if (success == False):
    print("Failed to load the XML file.")
    sys.exit()

dsig = chilkat2.XmlDSig()
success = dsig.LoadSignatureSb(sbXml)
if (success == False):
    print(dsig.LastErrorText)
    sys.exit()

if (dsig.HasEncapsulatedTimeStamp() == True):
    print("This signed XML already has an EncapsulatedTimeStamp")
    sys.exit()

# Specify the timestamping authority URL
json = chilkat2.JsonObject()
json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com")
json.UpdateBool("timestampToken.requestTsaCert",True)

# Call AddEncapsulatedTimeStamp to add the EncapsulatedTimeStamp to the signature.
# Note: If the signed XML contains multiple signatures, the signature modified is the one 
# indicated by the dsig.Selector property.
sbOut = chilkat2.StringBuilder()
success = dsig.AddEncapsulatedTimeStamp(json,sbOut)
if (success == False):
    print(dsig.LastErrorText)
    sys.exit()

sbOut.WriteFile("qa_output/addedEncapsulatedTimeStamp.xml","utf-8",False)

# The EncapsulatedTimeStamp can be validated when validating the signature by adding the VerifyEncapsulatedTimeStamp
# keyword to UncommonOptions.  See here:

# ----------------------------------------
# Verify the signatures we just produced...
verifier = chilkat2.XmlDSig()
success = verifier.LoadSignatureSb(sbOut)
if (success != True):
    print(verifier.LastErrorText)
    sys.exit()

# Add "VerifyEncapsulatedTimeStamp" to the UncommonOptions to also verify any EncapsulatedTimeStamps
verifier.UncommonOptions = "VerifyEncapsulatedTimeStamp"

numSigs = verifier.NumSignatures
verifyIdx = 0
while verifyIdx < numSigs :
    verifier.Selector = verifyIdx
    verified = verifier.VerifySignature(True)
    if (verified != True):
        print(verifier.LastErrorText)
        sys.exit()

    verifyIdx = verifyIdx + 1

print("All signatures were successfully verified.")