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Current Path : /var/opt/nydus/ops/oscrypto/
Linux 141.162.178.68.host.secureserver.net 3.10.0-1160.114.2.el7.x86_64 #1 SMP Wed Mar 20 15:54:52 UTC 2024 x86_64
Current File : //var/opt/nydus/ops/oscrypto/_pkcs5.py
# coding: utf-8
from __future__ import unicode_literals, division, absolute_import, print_function

import sys
import hashlib
import hmac
import struct

from ._asn1 import int_from_bytes, int_to_bytes
from ._errors import pretty_message
from ._types import type_name, byte_cls, int_types

if sys.version_info < (3,):
    chr_cls = chr

else:
    def chr_cls(num):
        return bytes([num])


__all__ = [
    'pbkdf2',
]


def pbkdf2(hash_algorithm, password, salt, iterations, key_length):
    """
    Implements PBKDF2 from PKCS#5 v2.2 in pure Python

    :param hash_algorithm:
        The string name of the hash algorithm to use: "md5", "sha1", "sha224",
        "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

    :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(pretty_message(
            '''
            iterations must be greater than 0 - is %s
            ''',
            repr(iterations)
        ))

    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(pretty_message(
            '''
            key_length must be greater than 0 - is %s
            ''',
            repr(key_length)
        ))

    if hash_algorithm not in set(['md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512']):
        raise ValueError(pretty_message(
            '''
            hash_algorithm must be one of "md5", "sha1", "sha224", "sha256",
            "sha384", "sha512", not %s
            ''',
            repr(hash_algorithm)
        ))

    algo = getattr(hashlib, hash_algorithm)

    hash_length = {
        'md5': 16,
        'sha1': 20,
        'sha224': 28,
        'sha256': 32,
        'sha384': 48,
        'sha512': 64
    }[hash_algorithm]

    original_hmac = hmac.new(password, None, algo)

    block = 1
    output = b''

    while len(output) < key_length:
        prf = original_hmac.copy()
        prf.update(salt + struct.pack(b'>I', block))
        last = prf.digest()

        u = int_from_bytes(last)

        for _ in range(iterations-1):
            prf = original_hmac.copy()
            prf.update(last)
            last = prf.digest()
            u ^= int_from_bytes(last)

        output += int_to_bytes(u, width=hash_length)
        block += 1

    return output[0:key_length]


pbkdf2.pure_python = True
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