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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)
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