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name : hashes.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 abc
import typing

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    UnsupportedAlgorithm,
    _Reasons,
)
from cryptography.hazmat.backends import _get_backend
from cryptography.hazmat.backends.interfaces import HashBackend


class HashAlgorithm(metaclass=abc.ABCMeta):
    @abc.abstractproperty
    def name(self) -> str:
        """
        A string naming this algorithm (e.g. "sha256", "md5").
        """

    @abc.abstractproperty
    def digest_size(self) -> int:
        """
        The size of the resulting digest in bytes.
        """

    @abc.abstractproperty
    def block_size(self) -> typing.Optional[int]:
        """
        The internal block size of the hash function, or None if the hash
        function does not use blocks internally (e.g. SHA3).
        """


class HashContext(metaclass=abc.ABCMeta):
    @abc.abstractproperty
    def algorithm(self) -> HashAlgorithm:
        """
        A HashAlgorithm that will be used by this context.
        """

    @abc.abstractmethod
    def update(self, data: bytes) -> None:
        """
        Processes the provided bytes through the hash.
        """

    @abc.abstractmethod
    def finalize(self) -> bytes:
        """
        Finalizes the hash context and returns the hash digest as bytes.
        """

    @abc.abstractmethod
    def copy(self) -> "HashContext":
        """
        Return a HashContext that is a copy of the current context.
        """


class ExtendableOutputFunction(metaclass=abc.ABCMeta):
    """
    An interface for extendable output functions.
    """


class Hash(HashContext):
    def __init__(self, algorithm: HashAlgorithm, backend=None, ctx=None):
        backend = _get_backend(backend)
        if not isinstance(backend, HashBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement HashBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE,
            )

        if not isinstance(algorithm, HashAlgorithm):
            raise TypeError("Expected instance of hashes.HashAlgorithm.")
        self._algorithm = algorithm

        self._backend = backend

        if ctx is None:
            self._ctx = self._backend.create_hash_ctx(self.algorithm)
        else:
            self._ctx = ctx

    algorithm = utils.read_only_property("_algorithm")

    def update(self, data: bytes) -> None:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        utils._check_byteslike("data", data)
        self._ctx.update(data)

    def copy(self) -> "Hash":
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        return Hash(
            self.algorithm, backend=self._backend, ctx=self._ctx.copy()
        )

    def finalize(self) -> bytes:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        digest = self._ctx.finalize()
        self._ctx = None
        return digest


class SHA1(HashAlgorithm):
    name = "sha1"
    digest_size = 20
    block_size = 64


class SHA512_224(HashAlgorithm):  # noqa: N801
    name = "sha512-224"
    digest_size = 28
    block_size = 128


class SHA512_256(HashAlgorithm):  # noqa: N801
    name = "sha512-256"
    digest_size = 32
    block_size = 128


class SHA224(HashAlgorithm):
    name = "sha224"
    digest_size = 28
    block_size = 64


class SHA256(HashAlgorithm):
    name = "sha256"
    digest_size = 32
    block_size = 64


class SHA384(HashAlgorithm):
    name = "sha384"
    digest_size = 48
    block_size = 128


class SHA512(HashAlgorithm):
    name = "sha512"
    digest_size = 64
    block_size = 128


class SHA3_224(HashAlgorithm):  # noqa: N801
    name = "sha3-224"
    digest_size = 28
    block_size = None


class SHA3_256(HashAlgorithm):  # noqa: N801
    name = "sha3-256"
    digest_size = 32
    block_size = None


class SHA3_384(HashAlgorithm):  # noqa: N801
    name = "sha3-384"
    digest_size = 48
    block_size = None


class SHA3_512(HashAlgorithm):  # noqa: N801
    name = "sha3-512"
    digest_size = 64
    block_size = None


class SHAKE128(HashAlgorithm, ExtendableOutputFunction):
    name = "shake128"
    block_size = None

    def __init__(self, digest_size: int):
        if not isinstance(digest_size, int):
            raise TypeError("digest_size must be an integer")

        if digest_size < 1:
            raise ValueError("digest_size must be a positive integer")

        self._digest_size = digest_size

    digest_size = utils.read_only_property("_digest_size")


class SHAKE256(HashAlgorithm, ExtendableOutputFunction):
    name = "shake256"
    block_size = None

    def __init__(self, digest_size: int):
        if not isinstance(digest_size, int):
            raise TypeError("digest_size must be an integer")

        if digest_size < 1:
            raise ValueError("digest_size must be a positive integer")

        self._digest_size = digest_size

    digest_size = utils.read_only_property("_digest_size")


class MD5(HashAlgorithm):
    name = "md5"
    digest_size = 16
    block_size = 64


class BLAKE2b(HashAlgorithm):
    name = "blake2b"
    _max_digest_size = 64
    _min_digest_size = 1
    block_size = 128

    def __init__(self, digest_size: int):

        if digest_size != 64:
            raise ValueError("Digest size must be 64")

        self._digest_size = digest_size

    digest_size = utils.read_only_property("_digest_size")


class BLAKE2s(HashAlgorithm):
    name = "blake2s"
    block_size = 64
    _max_digest_size = 32
    _min_digest_size = 1

    def __init__(self, digest_size: int):

        if digest_size != 32:
            raise ValueError("Digest size must be 32")

        self._digest_size = digest_size

    digest_size = utils.read_only_property("_digest_size")
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