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Editing: generate_cast5.py

# 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) as vector_file:
        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
                _, key = line.split(" = ")
                output.append(f"KEY = {key}")
            elif line.startswith("IV"):
                _, iv = line.split(" = ")
                iv = iv[0:16]
                output.append(f"IV = {iv}")
            elif line.startswith("PLAINTEXT"):
                _, 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)

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")

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