Foundations of Blockchain

An example implementation of AES

Let's implement the AES cipher technique using a Python cryptographic library called PyCryptodome. We will be using the PyCryptodome library throughout this chapter to implement other ciphers and hashing algorithms.

PyCryptodome is a self-contained Python package of low-level cryptographic primitives. PyCryptodome is a forked project of the PyCrypto library and is an active project with extended primitive support. So, it is an almost drop-in replacement for the old PyCrypto library.

We will use the AES module from Crypto.Cipher package and we will also import a module from Crypto.Random package to generate a random key for AES, as follows:

from Crypto.Cipher import AES from Crypto.Random import get_random_bytes ...