PyCryptodome

A cryptography library for python

Installation

pip install PyCryptodome

Usage

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
 
KEY = ?
FLAG = ?
 
def encrypt(plaintext):
    plaintext = bytes.fromhex(plaintext)
 
    padded = pad(plaintext + FLAG.encode(), 16)
    cipher = AES.new(KEY, AES.MODE_ECB)
    try:
        encrypted = cipher.encrypt(padded)
    except ValueError as e:
        return {"error": str(e)}
 
    return {"ciphertext": encrypted.hex()}