Gestionnaire de fichiers - Editer - /usr/lib/python2.7/site-packages/passlib/handlers/digests.py
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"""passlib.handlers.digests - plain hash digests """ #============================================================================= # imports #============================================================================= # core import hashlib import logging; log = logging.getLogger(__name__) # site # pkg from passlib.utils import to_native_str, to_bytes, render_bytes, consteq from passlib.utils.compat import unicode, str_to_uascii import passlib.utils.handlers as uh from passlib.crypto.digest import lookup_hash # local __all__ = [ "create_hex_hash", "hex_md4", "hex_md5", "hex_sha1", "hex_sha256", "hex_sha512", ] #============================================================================= # helpers for hexadecimal hashes #============================================================================= class HexDigestHash(uh.StaticHandler): """this provides a template for supporting passwords stored as plain hexadecimal hashes""" #=================================================================== # class attrs #=================================================================== _hash_func = None # hash function to use - filled in by create_hex_hash() checksum_size = None # filled in by create_hex_hash() checksum_chars = uh.HEX_CHARS #=================================================================== # methods #=================================================================== @classmethod def _norm_hash(cls, hash): return hash.lower() def _calc_checksum(self, secret): if isinstance(secret, unicode): secret = secret.encode("utf-8") return str_to_uascii(self._hash_func(secret).hexdigest()) #=================================================================== # eoc #=================================================================== def create_hex_hash(digest, module=__name__): # NOTE: could set digest_name=hash.name for cpython, but not for some other platforms. info = lookup_hash(digest) name = "hex_" + info.name return type(name, (HexDigestHash,), dict( name=name, __module__=module, # so ABCMeta won't clobber it _hash_func=staticmethod(info.const), # sometimes it's a function, sometimes not. so wrap it. checksum_size=info.digest_size*2, __doc__="""This class implements a plain hexadecimal %s hash, and follows the :ref:`password-hash-api`. It supports no optional or contextual keywords. """ % (info.name,) )) #============================================================================= # predefined handlers #============================================================================= hex_md4 = create_hex_hash("md4") hex_md5 = create_hex_hash("md5") hex_md5.django_name = "unsalted_md5" hex_sha1 = create_hex_hash("sha1") hex_sha256 = create_hex_hash("sha256") hex_sha512 = create_hex_hash("sha512") #============================================================================= # htdigest #============================================================================= class htdigest(uh.MinimalHandler): """htdigest hash function. .. todo:: document this hash """ name = "htdigest" setting_kwds = () context_kwds = ("user", "realm", "encoding") default_encoding = "utf-8" @classmethod def hash(cls, secret, user, realm, encoding=None): # NOTE: this was deliberately written so that raw bytes are passed through # unchanged, the encoding kwd is only used to handle unicode values. if not encoding: encoding = cls.default_encoding uh.validate_secret(secret) if isinstance(secret, unicode): secret = secret.encode(encoding) user = to_bytes(user, encoding, "user") realm = to_bytes(realm, encoding, "realm") data = render_bytes("%s:%s:%s", user, realm, secret) return hashlib.md5(data).hexdigest() @classmethod def _norm_hash(cls, hash): """normalize hash to native string, and validate it""" hash = to_native_str(hash, param="hash") if len(hash) != 32: raise uh.exc.MalformedHashError(cls, "wrong size") for char in hash: if char not in uh.LC_HEX_CHARS: raise uh.exc.MalformedHashError(cls, "invalid chars in hash") return hash @classmethod def verify(cls, secret, hash, user, realm, encoding="utf-8"): hash = cls._norm_hash(hash) other = cls.hash(secret, user, realm, encoding) return consteq(hash, other) @classmethod def identify(cls, hash): try: cls._norm_hash(hash) except ValueError: return False return True @uh.deprecated_method(deprecated="1.7", removed="2.0") @classmethod def genconfig(cls): return cls.hash("", "", "") @uh.deprecated_method(deprecated="1.7", removed="2.0") @classmethod def genhash(cls, secret, config, user, realm, encoding=None): # NOTE: 'config' is ignored, as this hash has no salting / other configuration. # just have to make sure it's valid. cls._norm_hash(config) return cls.hash(secret, user, realm, encoding) #============================================================================= # eof #=============================================================================
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