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Implement RSA OAEP Padding in Python

Implements OAEP-style padding with MGF1 using SHA-256 from the Python standard library for RSA encryption prep.

import os
import hashlib


def mgf1(seed, length, hash_func=hashlib.sha256):
    """MGF1 mask generation function."""
    output = b""
    counter = 0
    while len(output) < length:
        c = counter.to_bytes(4, "big")
        output += hash_func(seed + c).digest()
        counter += 1
    return output[:length]


…

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