# -*- coding: utf-8 -*-
#
#  Cipher/DES3.py : DES3
#
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# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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"""
Module's constants for the modes of operation supported with Triple DES:

:var MODE_ECB: Electronic Code Book (ECB)
:var MODE_CBC: Cipher-Block Chaining (CBC)
:var MODE_CFB: Cipher FeedBack (CFB)
:var MODE_OFB: Output FeedBack (OFB)
:var MODE_CTR: CounTer Mode (CTR)
:var MODE_OPENPGP:  OpenPGP Mode
:var MODE_EAX: EAX Mode
"""

import sys

from Crypto.Cipher import _create_cipher
from Crypto.Util.py3compat import byte_string, b, bchr, bord
from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
                                  VoidPointer, SmartPointer,
                                  c_size_t, expect_byte_string)

_raw_des3_lib = load_pycryptodome_raw_lib(
                    "Crypto.Cipher._raw_des3",
                    """
                    int DES3_start_operation(const uint8_t key[],
                                             size_t key_len,
                                             void **pResult);
                    int DES3_encrypt(const void *state,
                                     const uint8_t *in,
                                     uint8_t *out,
                                     size_t data_len);
                    int DES3_decrypt(const void *state,
                                     const uint8_t *in,
                                     uint8_t *out,
                                     size_t data_len);
                    int DES3_stop_operation(void *state);
                    """)


def adjust_key_parity(key_in):
    """Set the parity bits in a TDES key.

    :param key_in: the TDES key whose bits need to be adjusted
    :type key_in: byte string

    :returns: a copy of ``key_in``, with the parity bits correctly set
    :rtype: byte string

    :raises ValueError: if the TDES key is not 16 or 24 bytes long
    :raises ValueError: if the TDES key degenerates into Single DES
    """

    def parity_byte(key_byte):
        parity = 1
        for i in range(1, 8):
            parity ^= (key_byte >> i) & 1
        return (key_byte & 0xFE) | parity

    if len(key_in) not in key_size:
        raise ValueError("Not a valid TDES key")

    key_out = b("").join([ bchr(parity_byte(bord(x)) )for x in key_in ])

    if key_out[:8] == key_out[8:16] or key_out[-16:-8] == key_out[-8:]:
        raise ValueError("Triple DES key degenerates to single DES")

    return key_out


def _create_base_cipher(dict_parameters):
    """This method instantiates and returns a handle to a low-level base cipher.
    It will absorb named parameters in the process."""

    try:
        key_in = dict_parameters.pop("key")
    except KeyError:
        raise TypeError("Missing 'key' parameter")

    key = adjust_key_parity(key_in)

    start_operation = _raw_des3_lib.DES3_start_operation
    stop_operation = _raw_des3_lib.DES3_stop_operation

    cipher = VoidPointer()
    result = start_operation(key,
                             c_size_t(len(key)),
                             cipher.address_of())
    if result:
        raise ValueError("Error %X while instantiating the TDES cipher"
                         % result)
    return SmartPointer(cipher.get(), stop_operation)


def new(key, mode, *args, **kwargs):
    """Create a new Triple DES cipher.

    :param key:
        The secret key to use in the symmetric cipher.
        It must be 8 byte long. The parity bits will be ignored.
    :type key: byte string

    :param mode:
        The chaining mode to use for encryption or decryption.
    :type mode: One of the supported ``MODE_*`` constants

    :Keyword Arguments:
        *   *iv* (``byte string``) --
            (Only applicable for ``MODE_CBC``, ``MODE_CFB``, ``MODE_OFB``,
            and ``MODE_OPENPGP`` modes).

            The initialization vector to use for encryption or decryption.

            For ``MODE_CBC``, ``MODE_CFB``, and ``MODE_OFB`` it must be 8 bytes long.

            For ``MODE_OPENPGP`` mode only,
            it must be 8 bytes long for encryption
            and 10 bytes for decryption (in the latter case, it is
            actually the *encrypted* IV which was prefixed to the ciphertext).

            If not provided, a random byte string is generated (you must then
            read its value with the :attr:`iv` attribute).

        *   *nonce* (``byte string``) --
            (Only applicable for ``MODE_EAX`` and ``MODE_CTR``).

            A value that must never be reused for any other encryption done
            with this key.

            For ``MODE_EAX`` there are no
            restrictions on its length (recommended: **16** bytes).

            For ``MODE_CTR``, its length must be in the range **[0..7]**.

            If not provided for ``MODE_EAX``, a random byte string is generated (you
            can read it back via the ``nonce`` attribute).

        *   *segment_size* (``integer``) --
            (Only ``MODE_CFB``).The number of **bits** the plaintext and ciphertext
            are segmented in. It must be a multiple of 8.
            If not specified, it will be assumed to be 8.

        *   *mac_len* : (``integer``) --
            (Only ``MODE_EAX``)
            Length of the authentication tag, in bytes.
            It must be no longer than 8 (default).

        *   *initial_value* : (``integer``) --
            (Only ``MODE_CTR``). The initial value for the counter within
            the counter block. By default it is **0**.

    :Return: a Triple DES object, of the applicable mode.
    """

    return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)

MODE_ECB = 1
MODE_CBC = 2
MODE_CFB = 3
MODE_OFB = 5
MODE_CTR = 6
MODE_OPENPGP = 7
MODE_EAX = 9

# Size of a data block (in bytes)
block_size = 8
# Size of a key (in bytes)
key_size = (16, 24)
