docs/development/custom-vectors/seed/verify_seed.py

import binascii

import botan

from tests.utils import load_nist_vectors


def encrypt(mode, key, iv, plaintext):
    encryptor = botan.Cipher(
        "SEED/{0}/NoPadding".format(mode), "encrypt", binascii.unhexlify(key)
    )

    cipher_text = encryptor.cipher(
        binascii.unhexlify(plaintext), binascii.unhexlify(iv)
    )
    return binascii.hexlify(cipher_text)


def verify_vectors(mode, filename):
    with open(filename, "r") as f:
        vector_file = f.read().splitlines()

    vectors = load_nist_vectors(vector_file)
    for vector in vectors:
        ct = encrypt(mode, vector["key"], vector["iv"], vector["plaintext"])
        assert ct == vector["ciphertext"]


ofb_path = "vectors/cryptography_vectors/ciphers/SEED/seed-ofb.txt"
verify_vectors("OFB", ofb_path)
cfb_path = "vectors/cryptography_vectors/ciphers/SEED/seed-cfb.txt"
verify_vectors("CFB", cfb_path)