Htj%dZddlmZddlZejeZddlmZddl m Z ddl m Z ddl mZdd gZd Zd Zd Zd ZdZddZdadaddZdZdZdZdZeeeeZddZeddZ dS)zg passlib.utils.scrypt -- scrypt hash frontend and help utilities XXX: add this module to public docs? )absolute_importN)warn)exc)to_bytes)PYPYvalidatescryptli?c|dkrtd|z|dkrtd|z||ztkrtd|d||dks||dz zrtd|zdS) aI helper which validates a set of scrypt config parameters. scrypt will take ``O(n * r * p)`` time and ``O(n * r)`` memory. limitations are that ``n = 2**``, ``n < 2**(16*r)``, ``r * p < 2 ** 30``. :param n: scrypt rounds :param r: scrypt block size :param p: scrypt parallel factor zr must be > 0: r=%rzp must be > 0: p=%rzr * p must be < 2**30: r=z, p=z%n must be > 1, and a power of 2: n=%rT) ValueErrorMAX_RP)nrps \/var/www/html/CA-Chatbot/venv/lib/python3.11/site-packages/passlib/crypto/scrypt/__init__.pyrr)s 1uu.23331uu.23331uv~~j!!DEEE1uuQU u@1DEEE 4?c\|d|zd|dzztzzz}t||z}|S)a? calculate memory required for parameter combination. assumes parameters have already been validated. .. warning:: this is derived from OpenSSL's scrypt maxmem formula; and may not be correct for other implementations (additional buffers, different parallelism tradeoffs, etc). r ) UINT32_SIZEint)rrrfudgemaxmems restimate_maxmemrHs:"#'B!a%L;66 7F % F Mrr rct|||t|d}t|d}|dkrtd|tkrtdtzt ||||||S)a4run SCrypt key derivation function using specified parameters. :arg secret: passphrase string (unicode is encoded to bytes using utf-8). :arg salt: salt string (unicode is encoded to bytes using utf-8). :arg n: integer 'N' parameter :arg r: integer 'r' parameter :arg p: integer 'p' parameter :arg keylen: number of bytes of key to generate. defaults to 32 (the internal block size). :returns: a *keylen*-sized bytes instance SCrypt imposes a number of constraints on it's input parameters: * ``r * p < 2**30`` -- due to a limitation of PBKDF2-HMAC-SHA256. * ``keylen < (2**32 - 1) * 32`` -- due to a limitation of PBKDF2-HMAC-SHA256. * ``n`` must a be a power of 2, and > 1 -- internal limitation of scrypt() implementation :raises ValueError: if the provided parameters are invalid (see constraints above). .. warning:: Unless the third-party ``scrypt ``_ package is installed, passlib will use a builtin pure-python implementation of scrypt, which is *considerably* slower (and thus requires a much lower / less secure ``n`` value in order to be usuable). Installing the :mod:`!scrypt` package is strongly recommended. secret)paramsaltr zkeylen must be at least 1zkeylen too large, must be <= %d)rrr MAX_KEYLEN_scrypt)r r"rrrkeylens rr r ksR Q1 fH - - -F D ' ' 'D zz4555 :ZGHHH 64Aq& 1 11rcltrdnd}td|ztjddlm}|jS)zD Load pure-python scrypt implementation built into passlib. dzUsing builtin scrypt backend, which is %dx slower than is required for adequate security. Installing scrypt support (via 'pip install scrypt') is strongly recommendedr ) ScryptEngine)rrrPasslibSecurityWarning_builtinr)execute)slowdownr)s r_load_builtin_backendr.sW"rrsH #%- ./2/IKKK'&&&&&  rc ddlm}|S#t$rYnwxYw ddl}tdtjnB#t$r5}dt |vrtdtjYd}~nd}~wwxYwdS)z Try to import the ctypes-based scrypt hash function provided by the ``scrypt ``_ package. r)hashNz5'scrypt' package is too old (lacks ``hash()`` method)r zJ'scrypt' package failed to import correctly (possible installation issue?))r r0 ImportErrorrrPasslibWarningstr)r0r errs r_load_cffi_backendr5s         Z  DcFXYYYY %%% 3s88 # # ]# % % % % 4s! : A9+A44A9cD ddlmn#t$rYdSwxYwfd}|S)zf Attempt to load stdlib scrypt() implement and return wrapper. Returns None if not found. r)r Nc dt}|dkrt|||}|||||||S)Nr)passwordr"rrrdklenr) SCRYPT_MAXMEMr)r r"rrrr%r stdlib_scrypts rstdlib_scrypt_wrapperz3_load_stdlib_backend..stdlib_scrypt_wrappersL A::$Q1--F}f41Qf$*,,, ,r)hashlibr r1)r<r;s @r_load_stdlib_backendr>s` 3333333 tt,,,,,$ ! s  )stdlibr builtinFc`|dkrdS|dkrFtD]*} t||cS#tj$rY'wxYwtjdt|}|st d||}|stjd|z|rdS|a|adS)z set backend for scrypt(). if name not specified, loads first available. :raises ~passlib.exc.MissingBackendError: if backend can't be found .. note:: mainly intended to be called by unittests, and scrypt hash handler anyNdefaultdryrunzno scrypt backends availablezunknown scrypt backend: zscrypt backend %r not available) backend_values _set_backendrMissingBackendError_backend_loadersgetrbackendr$)namerEloaderr0s rrGrGs u}}   "  D #D888888*    %&DEEE!%%d++ E*TTCDD Dvxx T)*Kd*RSS S   Fs ,>>rCcV t|ddS#tj$rYdSwxYw)NTrDF)rGrrH)rLs r _has_backendrOsDT$''''t  "uus (()r)r r)F)!__doc__ __future__rlogging getLogger__name__logwarningsrpasslibr passlib.utilsrpasslib.utils.compatr__all__r:r#rrrrr$rKr r.r5r>rFdictrIrGrOrrr]s'&&&&&'g'11""""""%%%%%%   "  8 <  02020202f    2!!!B14   !> Yr