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(Chilkat2-Python) Verify Opaque Signature and Retrieve Signing Certificates

Demonstrates how to verify a PCKS7 opaque digital signature (signed data), extract the original file/data, and then extract the certificate(s) that were used to sign.

Chilkat2 Python Downloads

Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

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

crypt = chilkat2.Crypt2()

# Verify a PKCS7 signed-data (opaque signature) file and extract the original content to a file.
success = crypt.VerifyP7M("qa_data/p7m/opaqueSig.p7","qa_output/originalData.dat")
if (success != True):
    print(crypt.LastErrorText)
    sys.exit()

# Alternatively, we can do it in memory...
binData = chilkat2.BinData()
success = binData.LoadFile("qa_data/p7m/opaqueSig.p7")
# Your app should check for success, but we'll skip the check for brevity..

# If verified, the signature is unwrapped and binData is replaced with the original data that was signed.
success = crypt.OpaqueVerifyBd(binData)
if (success != True):
    print(crypt.LastErrorText)
    sys.exit()

# For our testing, we signed some text, so we can get it from the binData..
print("Original Data:")
print(binData.GetString("utf-8"))

# After any method call that verifies a signature, the crypt object will contain the certificate(s)
# that were used for signing (assuming the X.509 certs were available in the signature, which is typically the case).

# Get the number of signing certificates, and get each..
numCerts = crypt.NumSignerCerts
i = 0
while i < numCerts :
    # cert is a CkCert
    cert = crypt.GetSignerCert(i)
    print(cert.SubjectDN)

    i = i + 1

# We could also get the complete certificate chain of each signer cert,
# assuming the certs in the chain of authentication to the trusted root
# are available on the system, or provided to Chilkat by some other means
# (such as via the XmlCertVault class, the TrustedRoots class, etc.)
i = 0
while i < numCerts :
    # certChain is a CkCertChain
    certChain = crypt.GetSignerCertChain(i)
    # You can examine the various properties and methods for certChain in the online
    # reference documentation...

    i = i + 1


 

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