Reference library

Auth & security at scale

OAuth2, JWT, IAM patterns, secrets rotation, and least-privilege service auth.

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Auth & security at scale medium

ChaCha20-Poly1305 mock in Python

Simulates ChaCha20-Poly1305 AEAD encryption and authentication using SHA-256 as a deterministic keystream and tag generator.

crypto aead mock
Python 
from hashlib import sha256
import struct

def chacha20_block(key, counter, nonce):
    """Mock ChaCha20 block: deterministic pseudo-random keystream from key+counter+nonce."""
    state_input = key + struct.pack("<I", counter) + nonce + b"ChaCha20"
    return sha256(state_input).digest()[:64]  # 64-byte keystream bloc…
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