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import binascii
import botan
from tests.utils import load_nist_vectors
BLOCK_SIZE = 64
def encrypt(mode, key, iv, plaintext):
encryptor = botan.Cipher(
f"IDEA/{mode}/NoPadding", "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) 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"]
cbc_path = "tests/hazmat/primitives/vectors/ciphers/IDEA/idea-cbc.txt"
verify_vectors("CBC", cbc_path)
ofb_path = "tests/hazmat/primitives/vectors/ciphers/IDEA/idea-ofb.txt"
verify_vectors("OFB", ofb_path)
cfb_path = "tests/hazmat/primitives/vectors/ciphers/IDEA/idea-cfb.txt"
verify_vectors("CFB", cfb_path)
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