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# coding: utf-8 from __future__ import unicode_literals, division, absolute_import, print_function from .. import backend from .._errors import pretty_message from .._ffi import buffer_from_bytes, bytes_from_buffer from .._pkcs12 import pkcs12_kdf from .._types import type_name, byte_cls, int_types __all__ = [ 'pbkdf2', 'pkcs12_kdf', 'rand_bytes', ] _backend = backend() if _backend == 'win': from ._cng import bcrypt, BcryptConst, handle_error, open_alg_handle, close_alg_handle def pbkdf2(hash_algorithm, password, salt, iterations, key_length): """ PBKDF2 from PKCS#5 :param hash_algorithm: The string name of the hash algorithm to use: "sha1", "sha256", "sha384", "sha512" :param password: A byte string of the password to use an input to the KDF :param salt: A cryptographic random byte string :param iterations: The numbers of iterations to use when deriving the key :param key_length: The length of the desired key in bytes :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: The derived key as a byte string """ if not isinstance(password, byte_cls): raise TypeError(pretty_message( ''' password must be a byte string, not %s ''', type_name(password) )) if not isinstance(salt, byte_cls): raise TypeError(pretty_message( ''' salt must be a byte string, not %s ''', type_name(salt) )) if not isinstance(iterations, int_types): raise TypeError(pretty_message( ''' iterations must be an integer, not %s ''', type_name(iterations) )) if iterations < 1: raise ValueError('iterations must be greater than 0') if not isinstance(key_length, int_types): raise TypeError(pretty_message( ''' key_length must be an integer, not %s ''', type_name(key_length) )) if key_length < 1: raise ValueError('key_length must be greater than 0') if hash_algorithm not in set(['sha1', 'sha256', 'sha384', 'sha512']): raise ValueError(pretty_message( ''' hash_algorithm must be one of "sha1", "sha256", "sha384", "sha512", not %s ''', repr(hash_algorithm) )) alg_constant = { 'sha1': BcryptConst.BCRYPT_SHA1_ALGORITHM, 'sha256': BcryptConst.BCRYPT_SHA256_ALGORITHM, 'sha384': BcryptConst.BCRYPT_SHA384_ALGORITHM, 'sha512': BcryptConst.BCRYPT_SHA512_ALGORITHM }[hash_algorithm] alg_handle = None try: alg_handle = open_alg_handle(alg_constant, BcryptConst.BCRYPT_ALG_HANDLE_HMAC_FLAG) output_buffer = buffer_from_bytes(key_length) res = bcrypt.BCryptDeriveKeyPBKDF2( alg_handle, password, len(password), salt, len(salt), iterations, output_buffer, key_length, 0 ) handle_error(res) return bytes_from_buffer(output_buffer) finally: if alg_handle: close_alg_handle(alg_handle) pbkdf2.pure_python = False def rand_bytes(length): """ Returns a number of random bytes suitable for cryptographic purposes :param length: The desired number of bytes :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string """ if not isinstance(length, int_types): raise TypeError(pretty_message( ''' length must be an integer, not %s ''', type_name(length) )) if length < 1: raise ValueError('length must be greater than 0') if length > 1024: raise ValueError('length must not be greater than 1024') alg_handle = None try: alg_handle = open_alg_handle(BcryptConst.BCRYPT_RNG_ALGORITHM) buffer = buffer_from_bytes(length) res = bcrypt.BCryptGenRandom(alg_handle, buffer, length, 0) handle_error(res) return bytes_from_buffer(buffer) finally: if alg_handle: close_alg_handle(alg_handle) # winlegacy backend else: from .._pkcs5 import pbkdf2 from .._rand import rand_bytes
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