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import binascii
from cryptography.hazmat.primitives.ciphers import algorithms, base, modes
def encrypt(mode, key, iv, plaintext):
cipher = base.Cipher(
algorithms.SEED(binascii.unhexlify(key)),
mode(binascii.unhexlify(iv)),
)
encryptor = cipher.encryptor()
ct = encryptor.update(binascii.unhexlify(plaintext))
ct += encryptor.finalize()
return binascii.hexlify(ct)
def build_vectors(mode, filename):
with open(filename) as f:
vector_file = f.read().splitlines()
count = 0
output = []
key = None
iv = None
plaintext = None
for line in vector_file:
line = line.strip()
if line.startswith("KEY"):
if count != 0:
output.append(
f"CIPHERTEXT = {encrypt(mode, key, iv, plaintext)}"
)
output.append(f"\nCOUNT = {count}")
count += 1
name, key = line.split(" = ")
output.append(f"KEY = {key}")
elif line.startswith("IV"):
name, iv = line.split(" = ")
output.append(f"IV = {iv}")
elif line.startswith("PLAINTEXT"):
name, plaintext = line.split(" = ")
output.append(f"PLAINTEXT = {plaintext}")
output.append(f"CIPHERTEXT = {encrypt(mode, key, iv, plaintext)}")
return "\n".join(output)
def write_file(data, filename):
with open(filename, "w") as f:
f.write(data)
OFB_PATH = "vectors/cryptography_vectors/ciphers/AES/OFB/OFBMMT128.rsp"
write_file(build_vectors(modes.OFB, OFB_PATH), "seed-ofb.txt")
CFB_PATH = "vectors/cryptography_vectors/ciphers/AES/CFB/CFB128MMT128.rsp"
write_file(build_vectors(modes.CFB, CFB_PATH), "seed-cfb.txt")
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