Cardtool

A card data generation tool with DUKPT key derivation.

Installation

You should have python 3.9 or later to run this tool. So, please be sure you have the python interpreter installed before trying this setup guide.

Create a virtual environment:

python3 -m venv .env

Activate the virtual environment:

source .env/bin/activate

For testing purposes with alpha or beta versions, install this tool from TestPyPI:

pip3 install -U --extra-index-url https://test.pypi.org/simple/ cardtool==x.y.z[ab]N

Otherwise, install this tool from PyPI:

pip3 install cardtool

Finally, use it:

cardtool --help

Commands reference

Key decryption

A command to decrypt a TR-31 key block.

cardtool decrypt-key -kbpk  -kcv  YOUR_KEY_BLOCK

Card data generation

A command to generate a file with encrypted card data using DUKPT key derivation.

cardtool gen-card -cfg  -fmt json|yaml path_to_dump_card_data.[json|yaml]

Card data generation configuration file

The following is a reference configuration file for the gen-card command.

!CardConfig
# current version of command
version: "0.1" 
# terminal information
terminal:
  !Terminal
  # terminal country
  country: MEX
# encryption keys
key:
  # keys used to encrypt data
  data:
    !Key
    # base derivation key
    bdk: 0123456789ABCDEFFEDCBA9876543210
    # key serial number
    ksn: FFFF4545450000100002
  # keys used to encrypt pin
  pin:
    !Key
    # base derivation key
    bdk: 0123456789ABCDEFFEDCBA9876543210
    # key serial number
    ksn: FFFF4545450000100002
# transaction information
transaction:
  !Transaction
  # type of transaction
  type: charge
  # transaction amount
  amount: 10.2
  # another transaction amount, e.g., cashback amount
  other_amount: 10.23
  # transaction currency
  currency: USD
  # date of transaction with DDMMYY format
  date: "220125"
# array of cards to generate
cards:
  - !Card
    # card label, useful as an identifier for this card
    label: "Test"
    # primary account number 16-19 digits
    pan: "5477820000001234"
    # card pin 4-6 digits
    pin: "1234"
    # card brand (Visa, Mastercard, Carnet)
    brand: "Mastercard"
    # cardholder name
    cardholder_name: Test 1
    # card expiry month
    expiry_month: "12"
    # card expiry year
    expiry_year: "24"
    # card service code
    service_code: "201"
    # card sequence number
    sequence_number: 1