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: / usr / share / doc / python3-cryptography / docs / development / custom-vectors / idea /
Filename : generate_idea.py
back
import binascii

from cryptography.hazmat.primitives.ciphers import algorithms, base, modes


def encrypt(mode, key, iv, plaintext):
    cipher = base.Cipher(
        algorithms.IDEA(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, "r") 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(
                    "CIPHERTEXT = {0}".format(
                        encrypt(mode, key, iv, plaintext)
                    )
                )
            output.append("\nCOUNT = {0}".format(count))
            count += 1
            name, key = line.split(" = ")
            output.append("KEY = {0}".format(key))
        elif line.startswith("IV"):
            name, iv = line.split(" = ")
            iv = iv[0:16]
            output.append("IV = {0}".format(iv))
        elif line.startswith("PLAINTEXT"):
            name, plaintext = line.split(" = ")
            output.append("PLAINTEXT = {0}".format(plaintext))

    output.append("CIPHERTEXT = {0}".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), "idea-cbc.txt")
OFB_PATH = "tests/hazmat/primitives/vectors/ciphers/AES/OFB/OFBMMT128.rsp"
write_file(build_vectors(modes.OFB, OFB_PATH), "idea-ofb.txt")
CFB_PATH = "tests/hazmat/primitives/vectors/ciphers/AES/CFB/CFB128MMT128.rsp"
write_file(build_vectors(modes.CFB, CFB_PATH), "idea-cfb.txt")