| Current File : //usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyc |
�
�b�Xc @` s� d d l m Z m Z m Z d d l Z d d l m Z d d l m Z m Z m
Z
m Z d d l m
Z
d d l m Z m Z d d l m Z e j e � d e f d � � Y� Z e j e � d
e f d � � Y� Z d S( i ( t absolute_importt divisiont print_functionN( t utils( t AlreadyFinalizedt
InvalidKeyt UnsupportedAlgorithmt _Reasons( t HMACBackend( t
constant_timet hmac( t KeyDerivationFunctiont HKDFc B` s, e Z d � Z d � Z d � Z d � Z RS( c C` s� t | t � s$ t d t j � � n | | _ | d k pE t | t � sW t d � � n | d k rz d | j j d } n | | _
| | _ t | j | | | � | _
d S( Ns. Backend object does not implement HMACBackend.s salt must be bytes.t i ( t
isinstanceR R R t BACKEND_MISSING_INTERFACEt
_algorithmt Nonet bytest TypeErrort digest_sizet _saltt _backendt
HKDFExpandt _hkdf_expand( t selft algorithmt lengtht saltt infot backend( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyt __init__ s c C` s8 t j | j | j d | j �} | j | � | j � S( NR ( R
t HMACR R R t updatet finalize( R t key_materialt h( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyt _extract) s !
c C` s7 t | t � s t d � � n | j j | j | � � S( Ns key_material must be bytes.( R R R R t deriveR% ( R R# ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyR& . s c C` s( t j | j | � | � s$ t � n d S( N( R t bytes_eqR& R ( R R# t expected_key( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyt verify4 s ( t __name__t
__module__R R% R& R) ( ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyR s R c B` s, e Z d � Z d � Z d � Z d � Z RS( c C` s� t | t � s$ t d t j � � n | | _ | | _ d | j d } | | k rk t d j | � � � n | | _
| d k p� t | t � s� t
d � � n | d k r� d } n | | _ t | _ d S( Ns. Backend object does not implement HMACBackend.i� i s+ Can not derive keys larger than {0} octets.s info must be bytes.t ( R R R R R R R R t
ValueErrort formatt _lengthR R R t _infot Falset _used( R R R R R t
max_length( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyR ; s$ c C` s� d g } d } x� | j j t | � d | j k r� t j | | j d | j �} | j | d � | j | j � | j t j
| � � | j | j � � | d 7} q Wd j
| � | j S( NR, i R i����( R R t lenR/ R
R R R! R0 t sixt int2bytet appendR" t join( R R# t outputt counterR$ ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyt _expandZ s & c C` sF t | t � s t d � � n | j r0 t � n t | _ | j | � S( Ns key_material must be bytes.( R R R R2 R t TrueR; ( R R# ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyR& h s c C` s( t j | j | � | � s$ t � n d S( N( R R' R& R ( R R# R( ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyR) r s ( R* R+ R R; R& R) ( ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyR 9 s
( t
__future__R R R R5 t cryptographyR t cryptography.exceptionsR R R R t' cryptography.hazmat.backends.interfacesR t cryptography.hazmat.primitivesR R
t" cryptography.hazmat.primitives.kdfR t register_interfacet objectR R ( ( ( sM /usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/kdf/hkdf.pyt <module> s "&