(CkPython) IKOF Generation Code for Montenegro Fiscalization Service

Demonstrates computing the IKOF MD5 summary value as described in section 4.3 of this document: https://poreskauprava.gov.me/ResourceManager/FileDownload.aspx?rId=416042&rType=2

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

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

concatenatedParams = "12345678|2019-06-12T17:05:43+02:00|9952|bb123bb1231|cc123cc1231|ss123ss123|199.01"

# Get the private key from a pfx file.
pfx = chilkat.CkPfx()
success = pfx.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success != True):
    print(pfx.lastErrorText())
    sys.exit()

# privKey is a CkPrivateKey
privKey = pfx.GetPrivateKey(0)
if (pfx.get_LastMethodSuccess() == False):
    print(pfx.lastErrorText())
    sys.exit()

# Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
rsa = chilkat.CkRsa()
success = rsa.ImportPrivateKeyObj(privKey)
if (success == False):
    print(rsa.lastErrorText())
    sys.exit()

# PKCS-v1_5 is used by default.
rsa.put_EncodingMode("hex")
rsa.put_Charset("utf-8")
hexSig = rsa.signStringENC(concatenatedParams,"sha256")

print("Signature value result is: " + hexSig)

# Compute the MD5 hash of the bytes.
crypt = chilkat.CkCrypt2()
crypt.put_EncodingMode("hex")
crypt.put_HashAlgorithm("md5")
bd = chilkat.CkBinData()
bd.AppendEncoded(hexSig,"hex")
md5_summary = crypt.hashBdENC(bd)

print("MD5 summary value is: " + md5_summary)