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Edit File: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.

from __future__ import annotations

import abc

from cryptography.hazmat.bindings._rust import openssl as rust_openssl

__all__ = [
    "MD5",
    "SHA1",
    "SHA3_224",
    "SHA3_256",
    "SHA3_384",
    "SHA3_512",
    "SHA224",
    "SHA256",
    "SHA384",
    "SHA512",
    "SHA512_224",
    "SHA512_256",
    "SHAKE128",
    "SHAKE256",
    "SM3",
    "BLAKE2b",
    "BLAKE2s",
    "ExtendableOutputFunction",
    "Hash",
    "HashAlgorithm",
    "HashContext",
]

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

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

@property
    @abc.abstractmethod
    def block_size(self) -> int | None:
        """
        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):
    @property
    @abc.abstractmethod
    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.
        """

Hash = rust_openssl.hashes.Hash
HashContext.register(Hash)

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

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

@property
    def digest_size(self) -> int:
        return self._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

@property
    def digest_size(self) -> int:
        return self._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

@property
    def digest_size(self) -> int:
        return self._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

@property
    def digest_size(self) -> int:
        return self._digest_size

class SM3(HashAlgorithm):
    name = "sm3"
    digest_size = 32
    block_size = 64

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