psec 1.0.1

A Python package for cryptography in payment systems

psec provides tools for protecting sensitive data and cardholder authentication in retail payment transactions.

Install:

pip install psec

psec consists of the following modules:

• cvv - Card Verification Value generation

• des - Triple DES utilities

• mac - Message Authentication Code generation

• pin - Personal Identification Number generation

• pinblock - PIN Blocks encoding and decoding

• tools - Miscellaneous support tools

For example:

>>> import psec
>>> psec.pin.generate_visa_pvv(
...     pvk = bytes.fromhex("0123456789ABCDEFFEDCBA9876543210"),
...     pvki="1",
...     pin="1234",
...     pan="4321000000001234")
'6629'