(Ruby) 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

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

# 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.new()
success = pfx.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success == false)
    print pfx.lastErrorText() + "\n";
    exit
end

privKey = Chilkat::CkPrivateKey.new()
success = pfx.PrivateKeyAt(0,privKey)
if (success == false)
    print pfx.lastErrorText() + "\n";
    exit
end

# Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
rsa = Chilkat::CkRsa.new()
success = rsa.UsePrivateKey(privKey)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# 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 + "\n";

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

print "MD5 summary value is: " + md5_summary + "\n";