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  "   )ˆl–äY>”*i?u ¸ ¸ \”Å£Ìƒmá5¿Ê À    )"""passlib.handlers.sha1_crypt
"""

#=============================================================================
# imports
#=============================================================================

# core
import logging; log = logging.getLogger(__name__)
# site
# pkg
from passlib.utils import safe_crypt, test_crypt
from passlib.utils.binary import h64
from passlib.utils.compat import u, unicode, irange
from passlib.crypto.digest import compile_hmac
import passlib.utils.handlers as uh
# local
__all__ = [
]
#=============================================================================
# sha1-crypt
#=============================================================================
_BNULL = b'\x00'

class sha1_crypt(uh.HasManyBackends, uh.HasRounds, uh.HasSalt, uh.GenericHandler):
    """This class implements the SHA1-Crypt password hash, and follows the :ref:`password-hash-api`.

    It supports a variable-length salt, and a variable number of rounds.

    The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:

    :type salt: str
    :param salt:
        Optional salt string.
        If not specified, an 8 character one will be autogenerated (this is recommended).
        If specified, it must be 0-64 characters, drawn from the regexp range ``[./0-9A-Za-z]``.

    :type salt_size: int
    :param salt_size:
        Optional number of bytes to use when autogenerating new salts.
        Defaults to 8 bytes, but can be any value between 0 and 64.

    :type rounds: int
    :param rounds:
        Optional number of rounds to use.
        Defaults to 480000, must be between 1 and 4294967295, inclusive.

    :type relaxed: bool
    :param relaxed:
        By default, providing an invalid value for one of the other
        keywords will result in a :exc:`ValueError`. If ``relaxed=True``,
        and the error can be corrected, a :exc:`~passlib.exc.PasslibHashWarning`
        will be issued instead. Correctable errors include ``rounds``
        that are too small or too large, and ``salt`` strings that are too long.

        .. versionadded:: 1.6
    """

    #===================================================================
    # class attrs
    #===================================================================
    #--GenericHandler--
    name = "sha1_crypt"
    setting_kwds = ("salt", "salt_size", "rounds")
    ident = u("$sha1$")
    checksum_size = 28
    checksum_chars = uh.HASH64_CHARS

    #--HasSalt--
    default_salt_size = 8
    max_salt_size = 64
    salt_chars = uh.HASH64_CHARS

    #--HasRounds--
    default_rounds = 480000 # current passlib default
    min_rounds = 1 # really, this should be higher.
    max_rounds = 4294967295 # 32-bit integer limit
    rounds_cost = "linear"

    #===================================================================
    # formatting
    #===================================================================
    @classmethod
    def from_string(cls, hash):
        rounds, salt, chk = uh.parse_mc3(hash, cls.ident, handler=cls)
        return cls(rounds=rounds, salt=salt, checksum=chk)

    def to_string(self, config=False):
        chk = None if config else self.checksum
        return uh.render_mc3(self.ident, self.rounds, self.salt, chk)

    #===================================================================
    # backend
    #===================================================================
    backends = ("os_crypt", "builtin")

    #---------------------------------------------------------------
    # os_crypt backend
    #---------------------------------------------------------------
    @classmethod
    def _load_backend_os_crypt(cls):
        if test_crypt("test", '$sha1$1$Wq3GL2Vp$C8U25GvfHS8qGHim'
                              'ExLaiSFlGkAe'):
            cls._set_calc_checksum_backend(cls._calc_checksum_os_crypt)
            return True
        else