86 lines
3.1 KiB
Python
86 lines
3.1 KiB
Python
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# Copyright Rodolphe Breard (2017)
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# Author: Rodolphe Breard (2017)
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#
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# This software is a computer library whose purpose is to offer a
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# collection of tools for user authentication.
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/ or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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from ctypes import *
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from . import lib
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PASSWORD_MIN_LEN = 8
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PASSWORD_MAX_LEN = 128
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PASSWORD_STORAGE_LEN = 1024
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NOSTANDARD = 0
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NIST80063B = 1
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class LibreAuthPassError(Exception):
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"""Exception raised for errors in the password authentication module.
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Attributes:
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code -- error code
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message -- explanation of the error
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"""
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def __init__(self, code):
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valid_codes = {
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0: 'success',
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1: 'password is too short',
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2: 'password is too long',
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10: 'invalid password format',
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20: 'not enough space',
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}
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self.code = code
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if code in valid_codes:
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self.message = valid_codes[code]
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else:
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self.message = 'unknown error'
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def password_hash(password):
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return password_hash_standard(password, NOSTANDARD)
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def password_hash_standard(password, standard):
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pass_len = len(password)
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if pass_len < PASSWORD_MIN_LEN:
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raise LibreAuthPassError(1)
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if pass_len > PASSWORD_MAX_LEN:
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raise LibreAuthPassError(2)
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buff = create_string_buffer(b'\000' * PASSWORD_STORAGE_LEN)
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c_pass = create_string_buffer(password)
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err = lib.libreauth_password_hash(c_pass, buff, PASSWORD_STORAGE_LEN, standard)
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if err != 0:
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raise LibreAuthPassError(err)
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return str(buff.value, encoding="utf-8")
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def is_valid(password, reference):
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c_pass = create_string_buffer(password)
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c_ref = create_string_buffer(bytes(reference, encoding='utf-8'))
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return bool(lib.libreauth_password_is_valid(c_pass, c_ref))
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