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|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
import binascii
from cryptography.hazmat.primitives.ciphers import algorithms, base, modes
def encrypt(mode, key, iv, plaintext):
cipher = base.Cipher(
algorithms.CAST5(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):
count = 0
output = []
key = None
iv = None
plaintext = None
with open(filename, "r") as vector_file:
for line in vector_file:
line = line.strip()
if line.startswith("KEY"):
if count != 0:
output.append(
"CIPHERTEXT = {}".format(
encrypt(mode, key, iv, plaintext)
)
)
output.append("\nCOUNT = {}".format(count))
count += 1
name, key = line.split(" = ")
output.append("KEY = {}".format(key))
elif line.startswith("IV"):
name, iv = line.split(" = ")
iv = iv[0:16]
output.append("IV = {}".format(iv))
elif line.startswith("PLAINTEXT"):
name, plaintext = line.split(" = ")
output.append("PLAINTEXT = {}".format(plaintext))
output.append(
"CIPHERTEXT = {}".format(encrypt(mode, key, iv, plaintext))
)
return "\n".join(output)
def write_file(data, filename):
with open(filename, "w") as f:
f.write(data)
cbc_path = "tests/hazmat/primitives/vectors/ciphers/AES/CBC/CBCMMT128.rsp"
write_file(build_vectors(modes.CBC, cbc_path), "cast5-cbc.txt")
ofb_path = "tests/hazmat/primitives/vectors/ciphers/AES/OFB/OFBMMT128.rsp"
write_file(build_vectors(modes.OFB, ofb_path), "cast5-ofb.txt")
cfb_path = "tests/hazmat/primitives/vectors/ciphers/AES/CFB/CFB128MMT128.rsp"
write_file(build_vectors(modes.CFB, cfb_path), "cast5-cfb.txt")
ctr_path = "tests/hazmat/primitives/vectors/ciphers/AES/CTR/aes-128-ctr.txt"
write_file(build_vectors(modes.CTR, ctr_path), "cast5-ctr.txt")