(Chilkat2-Python) Extract XML string from a .p7m byte array (e.g. FATTURA ELETTRONICA, ITALY)

Chilkat2-Python example to extract the original XML from a .p7m (Signed-Data PKCS7 Format) provided as a byte array.

One use for this example is to extract the original XML from a Fattura Elettronica .p7m signature.

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.

fac = chilkat2.FileAccess()

# p7mBytes is a memoryview
p7mBytes = fac.ReadEntireFile("testData/p7m/fattura_signature.p7m")
if (fac.LastMethodSuccess != True):
    print(fac.LastErrorText)
    sys.exit()

crypt = chilkat2.Crypt2()

originalXml = crypt.OpaqueVerifyString(p7mBytes)
if (crypt.LastMethodSuccess != True):
    print(fac.LastErrorText)
    sys.exit()

print("Original XML:")
print(originalXml)

print("Success!")