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o �hk � @ s� d Z ddlmZ ddlZddlmZ ddlmZ ddlmZ ddl m Z ddl m Z dd l m Z dd l mZ ddlZdd lmZ dd lmZ d Ze�� Ze �� ZG dd� dej�ZG dd� dejej �Z dS )zIECDSA (ES256) verifier and signer that use the ``cryptography`` library. � )�utilsN)�backends)�hashes)� serialization)�ec)�padding)�decode_dss_signature)�encode_dss_signature)�_helpers)�bases -----BEGIN CERTIFICATE-----c @ s8 e Zd ZdZdd� Ze�ej�dd� �Z e dd� �Z dS ) � ES256Verifierz�Verifies ECDSA cryptographic signatures using public keys. Args: public_key ( cryptography.hazmat.primitives.asymmetric.ec.ECDSAPublicKey): The public key used to verify signatures. c C s || _ d S �N)�_pubkey)�self� public_key� r �J/usr/local/CyberCP/lib/python3.10/site-packages/google/auth/crypt/es256.py�__init__/ s zES256Verifier.__init__c C s� t �|�}t|�dkr dS t �� r tj|d d� dd�n tj|d d� dd�}t �� r6tj|dd � dd�n tj|dd � dd�}t||�}t �|�}z| j � ||t � t �� �� W dS ttjjfyi Y dS w )N�@ F� �big�� byteorderT)r �to_bytes�len� is_python_3�int� from_bytesr �int_from_bytesr r �verifyr �ECDSAr �SHA256� ValueError� cryptography� exceptions�InvalidSignature)r �message� signature� sig_bytes�r�s�asn1_sigr r r r 2 s& ���� �zES256Verifier.verifyc C sD t �|�}t|v rtj�|t�}|�� }| |�S t� |t�}| |�S )ay Construct an Verifier instance from a public key or public certificate string. Args: public_key (Union[str, bytes]): The public key in PEM format or the x509 public key certificate. Returns: Verifier: The constructed verifier. Raises: ValueError: If the public key can't be parsed. ) r r �_CERTIFICATE_MARKERr# �x509�load_pem_x509_certificate�_BACKENDr r �load_pem_public_key)�clsr �public_key_data�cert�pubkeyr r r � from_stringK s � �zES256Verifier.from_stringN) �__name__� __module__� __qualname__�__doc__r r �copy_docstringr �Verifierr � classmethodr5 r r r r r & s r c @ sd e Zd ZdZddd�Zee�ej �dd� ��Z e�ej �dd� �Z e dd d ��Z d d � Zd d� ZdS )� ES256Signera� Signs messages with an ECDSA private key. Args: private_key ( cryptography.hazmat.primitives.asymmetric.ec.ECDSAPrivateKey): The private key to sign with. key_id (str): Optional key ID used to identify this private key. This can be useful to associate the private key with its associated public key or certificate. Nc C s || _ || _d S r )�_key�_key_id)r � private_key�key_idr r r r t s zES256Signer.__init__c C s | j S r )r? )r r r r rA x s zES256Signer.key_idc C sj t �|�}| j�|t�t�� ��}t|�\}}t � � r)|jddd�|jddd� S t � |d�t � |d� S )Nr r r ) r r r> �signr r r r! r r r � int_to_bytes)r r& �asn1_signaturer) r* r r r rB } s ���zES256Signer.signc C s& t �|�}tj|dtd�}| ||d�S )al Construct a RSASigner from a private key in PEM format. Args: key (Union[bytes, str]): Private key in PEM format. key_id (str): An optional key id used to identify the private key. Returns: google.auth.crypt._cryptography_rsa.RSASigner: The constructed signer. Raises: ValueError: If ``key`` is not ``bytes`` or ``str`` (unicode). UnicodeDecodeError: If ``key`` is ``bytes`` but cannot be decoded into a UTF-8 ``str``. ValueError: If ``cryptography`` "Could not deserialize key data." N)�password�backend)rA )r r r �load_pem_private_keyr/ )r1 �keyrA r@ r r r r5 � s � zES256Signer.from_stringc C s0 | j �� }| jjtjjtjjt� � d�|d< |S )z1Pickle helper that serializes the _key attribute.)�encoding�format�encryption_algorithmr> ) �__dict__�copyr> � private_bytesr �Encoding�PEM� PrivateFormat�PKCS8� NoEncryption�r �stater r r � __getstate__� s �zES256Signer.__getstate__c C s$ t �|d d�|d< | j�|� dS )z3Pickle helper that deserializes the _key attribute.r> N)r rG rL �updaterT r r r � __setstate__� s zES256Signer.__setstate__r )r6 r7 r8 r9 r �propertyr r: r �SignerrA rB r< r5 rV rX r r r r r= h s r= ) r9 r# r �cryptography.exceptions�cryptography.hazmatr � cryptography.hazmat.primitivesr r �)cryptography.hazmat.primitives.asymmetricr r �/cryptography.hazmat.primitives.asymmetric.utilsr r �cryptography.x509� google.authr �google.auth.cryptr r, �default_backendr/ �PKCS1v15�_PADDINGr; r rZ �FromServiceAccountMixinr= r r r r �<module> s$ B
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