3
ꅭh @ s| d dl mZmZmZ d dlmZ d dlmZmZm Z d dl
m Z d dl m
Z
d dlmZmZ ejejG dd deZd S )
)absolute_importdivisionprint_function)utils)AlreadyFinalizedUnsupportedAlgorithm_Reasons) _get_backend) CMACBackend)ciphersmacc @ s6 e Zd Zd ddZdd Zdd Zdd Zd
d ZdS )
CMACNc C sb t |}t|ts tdtjt|tjs2td|| _ || _
|d krX| j
j | j | _ n|| _ d S )Nz.Backend object does not implement CMACBackend.z*Expected instance of BlockCipherAlgorithm.)
r
isinstancer
r r ZBACKEND_MISSING_INTERFACEr ZBlockCipherAlgorithm TypeError
_algorithm_backendZcreate_cmac_ctx_ctx)self algorithmbackendctx r /usr/lib64/python3.6/cmac.py__init__ s
z
CMAC.__init__c C s. | j d krtdtjd| | j j| d S )Nz Context was already finalized.data)r r r _check_bytesupdate)r r r r r r & s
z CMAC.updatec C s& | j d krtd| j j }d | _ |S )Nz Context was already finalized.)r r finalize)r Zdigestr r r r - s
z
CMAC.finalizec C s: t jd| | jd kr td| jd }| _|j| d S )N signaturez Context was already finalized.)r r r r verify)r r r r r r r 4 s
z CMAC.verifyc C s* | j d krtdt| j| j| j j dS )Nz Context was already finalized.)r r )r r r
r r copy)r r r r r < s
z CMAC.copy)NN)__name__
__module__ __qualname__r r r r r r r r r r
s
r
N)Z
__future__r r r Z cryptographyr Zcryptography.exceptionsr r r Z cryptography.hazmat.backendsr Z'cryptography.hazmat.backends.interfacesr
Z cryptography.hazmat.primitivesr r Zregister_interfaceZ
MACContextobjectr
r r r r s