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# Copyright 2018 Donald Stufft and individual contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import absolute_import, division, print_function

from nacl import exceptions as exc
from nacl._sodium import ffi, lib
from nacl.exceptions import ensure

__all__ = ["crypto_kx_keypair",
           "crypto_kx_client_session_keys",
           "crypto_kx_server_session_keys",
           "crypto_kx_PUBLIC_KEY_BYTES",
           "crypto_kx_SECRET_KEY_BYTES",
           "crypto_kx_SEED_BYTES",
           "crypto_kx_SESSION_KEY_BYTES"]

"""
Implementations of client, server key exchange
"""
crypto_kx_PUBLIC_KEY_BYTES = lib.crypto_kx_publickeybytes()
crypto_kx_SECRET_KEY_BYTES = lib.crypto_kx_secretkeybytes()
crypto_kx_SEED_BYTES = lib.crypto_kx_seedbytes()
crypto_kx_SESSION_KEY_BYTES = lib.crypto_kx_sessionkeybytes()


def crypto_kx_keypair():
    """
    Generate a keypair.
    This is a duplicate crypto_box_keypair, but
    is included for api consistency.
    :return: (public_key, secret_key)
    :rtype: (bytes, bytes)
    """
    public_key = ffi.new("unsigned char[]", crypto_kx_PUBLIC_KEY_BYTES)
    secret_key = ffi.new("unsigned char[]", crypto_kx_SECRET_KEY_BYTES)
    res = lib.crypto_kx_keypair(public_key, secret_key)
    ensure(res == 0, "Key generation failed.", raising=exc.CryptoError)

    return (ffi.buffer(public_key, crypto_kx_PUBLIC_KEY_BYTES)[:],
            ffi.buffer(secret_key, crypto_kx_SECRET_KEY_BYTES)[:])


def crypto_kx_seed_keypair(seed):
    """
    Generate a keypair with a given seed.
    This is functionally the same as crypto_box_seed_keypair, however
    it uses the blake2b hash primitive instead of sha512.
    It is included mainly for api consistency when using crypto_kx.
    :param seed: random seed
    :type seed: bytes
    :return: (public_key, secret_key)
    :rtype: (bytes, bytes)
    """
    public_key = ffi.new("unsigned char[]", crypto_kx_PUBLIC_KEY_BYTES)
    secret_key = ffi.new("unsigned char[]", crypto_kx_SECRET_KEY_BYTES)
    ensure(isinstance(seed, bytes) and
           len(seed) == crypto_kx_SEED_BYTES,
           'Seed must be a {0} byte long bytes sequence'.format(
               crypto_kx_SEED_BYTES),
           raising=exc.TypeError)
    res = lib.crypto_kx_seed_keypair(public_key, secret_key, seed)
    ensure(res == 0, "Key generation failed.", raising=exc.CryptoError)

    return (ffi.buffer(public_key, crypto_kx_PUBLIC_KEY_BYTES)[:],
            ffi.buffer(secret_key, crypto_kx_SECRET_KEY_BYTES)[:])


def crypto_kx_client_session_keys(client_public_key,
                                  client_secret_key,
                                  server_public_key):
    """
    Generate session keys for the client.
    :param client_public_key:
    :type client_public_key: bytes
    :param client_secret_key:
    :type client_secret_key: bytes
    :param server_public_key:
    :type server_public_key: bytes
    :return: (rx_key, tx_key)
    :rtype: (bytes, bytes)
    """
    ensure(isinstance(client_public_key, bytes) and
           len(client_public_key) == crypto_kx_PUBLIC_KEY_BYTES,
           'Client public key must be a {0} bytes long bytes sequence'.format(
               crypto_kx_PUBLIC_KEY_BYTES),
           raising=exc.TypeError)
    ensure(isinstance(client_secret_key, bytes) and
           len(client_secret_key) == crypto_kx_SECRET_KEY_BYTES,
           'Client secret key must be a {0} bytes long bytes sequence'.format(
               crypto_kx_PUBLIC_KEY_BYTES),
           raising=exc.TypeError)
    ensure(isinstance(server_public_key, bytes) and
           len(server_public_key) == crypto_kx_PUBLIC_KEY_BYTES,
           'Server public key must be a {0} bytes long bytes sequence'.format(
               crypto_kx_PUBLIC_KEY_BYTES),
           raising=exc.TypeError)

    rx_key = ffi.new("unsigned char[]", crypto_kx_SESSION_KEY_BYTES)
    tx_key = ffi.new("unsigned char[]", crypto_kx_SESSION_KEY_BYTES)
    res = lib.crypto_kx_client_session_keys(rx_key,
                                            tx_key,
                                            client_public_key,
                                            client_secret_key,
                                            server_public_key)
    ensure(res == 0,
           "Client session key generation failed.",
           raising=exc.CryptoError)

    return (ffi.buffer(rx_key, crypto_kx_SESSION_KEY_BYTES)[:],
            ffi.buffer(tx_key, crypto_kx_SESSION_KEY_BYTES)[:])


def crypto_kx_server_session_keys(server_public_key,
                                  server_secret_key,
                                  client_public_key):
    """
    Generate session keys for the server.
    :param server_public_key:
    :type server_public_key: bytes
    :param server_secret_key:
    :type server_secret_key: bytes
    :param client_public_key:
    :type client_public_key: bytes
    :return: (rx_key, tx_key)
    :rtype: (bytes, bytes)
    """
    ensure(isinstance(server_public_key, bytes) and
           len(server_public_key) == crypto_kx_PUBLIC_KEY_BYTES,
           'Server public key must be a {0} bytes long bytes sequence'.format(
               crypto_kx_PUBLIC_KEY_BYTES),
           raising=exc.TypeError)
    ensure(isinstance(server_secret_key, bytes) and
           len(server_secret_key) == crypto_kx_SECRET_KEY_BYTES,
           'Server secret key must be a {0} bytes long bytes sequence'.format(
               crypto_kx_PUBLIC_KEY_BYTES),
           raising=exc.TypeError)
    ensure(isinstance(client_public_key, bytes) and
           len(client_public_key) == crypto_kx_PUBLIC_KEY_BYTES,
           'Client public key must be a {0} bytes long bytes sequence'.format(
               crypto_kx_PUBLIC_KEY_BYTES),
           raising=exc.TypeError)

    rx_key = ffi.new("unsigned char[]", crypto_kx_SESSION_KEY_BYTES)
    tx_key = ffi.new("unsigned char[]", crypto_kx_SESSION_KEY_BYTES)
    res = lib.crypto_kx_server_session_keys(rx_key,
                                            tx_key,
                                            server_public_key,
                                            server_secret_key,
                                            client_public_key)
    ensure(res == 0,
           "Server session key generation failed.",
           raising=exc.CryptoError)

    return (ffi.buffer(rx_key, crypto_kx_SESSION_KEY_BYTES)[:],
            ffi.buffer(tx_key, crypto_kx_SESSION_KEY_BYTES)[:])