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Code Editor : x963kdf.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 typing from cryptography import utils from cryptography.exceptions import AlreadyFinalized, InvalidKey from cryptography.hazmat.primitives import constant_time, hashes from cryptography.hazmat.primitives.kdf import KeyDerivationFunction def _int_to_u32be(n: int) -> bytes: return n.to_bytes(length=4, byteorder="big") class X963KDF(KeyDerivationFunction): def __init__( self, algorithm: hashes.HashAlgorithm, length: int, sharedinfo: typing.Optional[bytes], backend: typing.Any = None, ): max_len = algorithm.digest_size * (2**32 - 1) if length > max_len: raise ValueError(f"Cannot derive keys larger than {max_len} bits.") if sharedinfo is not None: utils._check_bytes("sharedinfo", sharedinfo) self._algorithm = algorithm self._length = length self._sharedinfo = sharedinfo self._used = False def derive(self, key_material: bytes) -> bytes: if self._used: raise AlreadyFinalized self._used = True utils._check_byteslike("key_material", key_material) output = [b""] outlen = 0 counter = 1 while self._length > outlen: h = hashes.Hash(self._algorithm) h.update(key_material) h.update(_int_to_u32be(counter)) if self._sharedinfo is not None: h.update(self._sharedinfo) output.append(h.finalize()) outlen += len(output[-1]) counter += 1 return b"".join(output)[: self._length] def verify(self, key_material: bytes, expected_key: bytes) -> None: if not constant_time.bytes_eq(self.derive(key_material), expected_key): raise InvalidKey
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