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o �)%a;4 � @ s� d dl mZ d dlmZmZmZ d dlmZmZm Z d dl m Z m Z d dl mZmZmZ dejfdd�Zd d � Zd d � Zd d� Zdd� Zdd� ZG dd� de�ZG dd� de�ZG dd� dej�ZG dd� dej �Z dS ) � )�utils)�InvalidSignature�UnsupportedAlgorithm�_Reasons)� _calculate_digest_and_algorithm�_check_not_prehashed� _warn_sign_verify_deprecated)�hashes� serialization)�AsymmetricSignatureContext� AsymmetricVerificationContext�ec�signature_algorithmc C s t | tj�s tdtj��d S )Nz/Unsupported elliptic curve signature algorithm.)� isinstancer �ECDSAr r � UNSUPPORTED_PUBLIC_KEY_ALGORITHM)r � r �I/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/ec.py�_check_signature_algorithm s ��r c C s� | j �|�}| �|| jjk� | j �|�}|| j jkr td��| j js/| j � |�dkr/td��| j � |�}| �|| jjk� | j� |�� d�}|S )Nz;ECDSA keys with unnamed curves are unsupported at this timer �ascii) �_lib�EC_KEY_get0_group�openssl_assert�_ffi�NULL�EC_GROUP_get_curve_name� NID_undef�NotImplementedError�CRYPTOGRAPHY_IS_LIBRESSL�EC_GROUP_get_asn1_flag� OBJ_nid2sn�string�decode)�backend�ec_key�group�nid� curve_name�snr r r �_ec_key_curve_sn# s" ��� r) c C s | j �|| j j� dS )z� Set the named curve flag on the EC_KEY. This causes OpenSSL to serialize EC keys along with their curve OID which makes deserialization easier. N)r �EC_KEY_set_asn1_flag�OPENSSL_EC_NAMED_CURVE)r# �ec_cdatar r r �_mark_asn1_named_ec_curveA s �r- c C s0 zt j| � W S ty td�|�tj��w )Nz${} is not a supported elliptic curve)r � _CURVE_TYPES�KeyErrorr �formatr �UNSUPPORTED_ELLIPTIC_CURVE)r# r( r r r �_sn_to_elliptic_curveM s ��r2 c C sz | j �|j�}| �|dk� | j�d|�}| j�dd�}| j �d|t|�|||j�}| �|dk� | j�|�d |d � S )Nr zunsigned char[]zunsigned int[]� ) r � ECDSA_size�_ec_keyr r �new� ECDSA_sign�len�buffer)r# � private_key�data�max_size�sigbuf� siglen_ptr�resr r r �_ecdsa_sig_signW s �r@ c C s8 | j �d|t|�|t|�|j�}|dkr| �� t�d S )Nr r3 )r � ECDSA_verifyr8 r5 �_consume_errorsr )r# � public_key� signaturer; r? r r r �_ecdsa_sig_verifyd s ��rE c @ sB e Zd Zdejdejfdd�Zdeddfdd �Z defd d �Z dS ) �_ECDSASignatureContextr: � algorithmc C s || _ || _t�||�| _d S �N)�_backend� _private_keyr �Hash�_digest)�selfr# r: rG r r r �__init__n s z _ECDSASignatureContext.__init__r; �returnNc C � | j �|� d S rH �rL �update�rM r; r r r rR x � z _ECDSASignatureContext.updatec C s | j �� }t| j| j|�S rH )rL �finalizer@ rI rJ �rM �digestr r r rU { s z _ECDSASignatureContext.finalize) �__name__� __module__� __qualname__r �EllipticCurvePrivateKeyr � HashAlgorithmrN �bytesrR rU r r r r rF m s � � rF c @ sB e Zd Zdejdedejfdd�Zdeddfd d �Z d d d �Z dS )�_ECDSAVerificationContextrC rD rG c C s$ || _ || _|| _t�||�| _d S rH )rI � _public_key� _signaturer rK rL )rM r# rC rD rG r r r rN � s z"_ECDSAVerificationContext.__init__r; rO Nc C rP rH rQ rS r r r rR � rT z _ECDSAVerificationContext.updatec C s" | j �� }t| j| j| j|� d S rH )rL rU rE rI r_ r` rV r r r �verify� s �z _ECDSAVerificationContext.verify)rO N) rX rY rZ r �EllipticCurvePublicKeyr] r r\ rN rR ra r r r r r^ � s �� � r^ c @ s� e Zd Zdd� Ze�d�Zedefdd��Z de j de fdd �Z d e jd e jdefd d �Zde jfdd�Zde jfdd�Zdejdejdejdefdd�Zdede j defdd�ZdS )�_EllipticCurvePrivateKeyc C �6 || _ || _|| _t||�}t||�| _t||� d S rH �rI r5 � _evp_pkeyr) r2 �_curver- �rM r# � ec_key_cdata�evp_pkeyr( r r r rN � � z!_EllipticCurvePrivateKey.__init__rg rO c C � | j jS rH ��curve�key_size�rM r r r ro � � z!_EllipticCurvePrivateKey.key_sizer c C s: t � t|� t|j� t|jtj�sJ �t| j| |j�S rH ) r r r rG r r r\ rF rI )rM r r r r �signer� s �z _EllipticCurvePrivateKey.signerrG �peer_public_keyc C s� | j �|| j�stdtj��|jj| jjkrtd��| j j� | j �}| j j� |�d d }| j � |dk� | j j �d|�}| j j�|j �}| j j�|||| j | j j j�}| j � |dk� | j j �|�d |� S )Nz1This backend does not support the ECDH algorithm.z2peer_public_key and self are not on the same curve� � r z uint8_t[])rI �+elliptic_curve_exchange_algorithm_supportedrn r r � UNSUPPORTED_EXCHANGE_ALGORITHM�name� ValueErrorr r r5 �EC_GROUP_get_degreer r r6 �EC_KEY_get0_public_key�ECDH_compute_keyr r9 )rM rG rs r% �z_len�z_buf�peer_key�rr r r �exchange� s0 ������z!_EllipticCurvePrivateKey.exchangec C s� | j j�| j�}| j �|| j jjk� | j j�|�}| j �|�}| j j� | j�}| j �|| j jjk� | j j� ||�}| j �|dk� | j � |�}t | j ||�S )Nr3 ) rI r r r5 r r r r �_ec_key_new_by_curve_nidr{ �EC_KEY_set_public_key�_ec_cdata_to_evp_pkey�_EllipticCurvePublicKey)rM r% � curve_nid� public_ec_key�pointr? rj r r r rC � s z#_EllipticCurvePrivateKey.public_keyc C s2 | j j�| j�}| j �|�}tj|| �� �� d�S )N)� private_value�public_numbers) rI r �EC_KEY_get0_private_keyr5 � _bn_to_intr �EllipticCurvePrivateNumbersrC r� )rM �bnr� r r r �private_numbers� s �z(_EllipticCurvePrivateKey.private_numbers�encodingr0 �encryption_algorithmc C s | j �|||| | j| j�S rH )rI �_private_key_bytesrf r5 )rM r� r0 r� r r r � private_bytes� s �z&_EllipticCurvePrivateKey.private_bytesr; c C s* t |� t| j||j�\}}t| j| |�S rH )r r rI � _algorithmr@ )rM r; r rG r r r �sign� s �z _EllipticCurvePrivateKey.signN)rX rY rZ rN r �read_only_propertyrn �property�intro r � EllipticCurveSignatureAlgorithmr rr �ECDHrb r] r� rC r� r� r �Encoding� PrivateFormat�KeySerializationEncryptionr� r� r r r r rc � sF � � �� � ��� ����rc c @ s� e Zd Zdd� Ze�d�Zedefdd��Z de de j de fd d �Zde jfd d �Zd ejde fdd�Zdejd ejde fdd�Zde de de j ddfdd�ZdS )r� c C rd rH re rh r r r rN rk z _EllipticCurvePublicKey.__init__rg rO c C rl rH rm rp r r r ro rq z _EllipticCurvePublicKey.key_sizerD r c C sH t � t�d|� t|� t|j� t|jtj�sJ �t | j | ||j�S )NrD ) r r � _check_bytesr r rG r r r\ r^ rI )rM rD r r r r �verifier s �z _EllipticCurvePublicKey.verifierc C s� | j �| j�\}}| j j�| j�}| j �|| j jjk� | j �� �2}| j j� |�}| j j� |�}||||||�}| j �|dk� | j � |�}| j � |�} W d � n1 sVw Y t j || | j d�S )Nr3 )�x�yrn )rI � _ec_key_determine_group_get_funcr5 r r{ r r r � _tmp_bn_ctx� BN_CTX_getr� r �EllipticCurvePublicNumbersrg ) rM �get_funcr% r� �bn_ctx�bn_x�bn_yr? r� r� r r r r� * s � � z&_EllipticCurvePublicKey.public_numbersr0 c C s$ |t jju r | jjj}n |t jju sJ �| jjj}| jj�| j �}| j� || jj j k� | jj� | j �}| j� || jj j k� | j�� �;}| jj�|||| jj j d|�}| j� |dk� | jj �d|�}| jj�||||||�}| j� ||k� W d � n1 s�w Y | jj �|�d d � S )Nr zchar[])r � PublicFormat�CompressedPointrI r �POINT_CONVERSION_COMPRESSED�UncompressedPoint� POINT_CONVERSION_UNCOMPRESSEDr r5 r r r r{ r� �EC_POINT_point2octr6 r9 ) rM r0 � conversionr% r� r� �buflen�bufr? r r r � _encode_point= s( � � � z%_EllipticCurvePublicKey._encode_pointr� c C sl |t jju s|t jju s|t jju r+|t jjus"|t jjt jjfvr&td��| �|�S | j� ||| | j d �S )NzKX962 encoding must be used with CompressedPoint or UncompressedPoint format) r r� �X962r� r� r� ry r� rI �_public_key_bytesrf )rM r� r0 r r r � public_bytesU s �� �z$_EllipticCurvePublicKey.public_bytesr; Nc C s0 t |� t| j||j�\}}t| j| ||� d S rH )r r rI r� rE )rM rD r; r rG r r r ra n s �z _EllipticCurvePublicKey.verify)rX rY rZ rN r r� rn r� r� ro r] r r� r r� r� r� r r� r� r� r� ra r r r r r� s< �� ��� �����r� N) � cryptographyr �cryptography.exceptionsr r r �*cryptography.hazmat.backends.openssl.utilsr r r � cryptography.hazmat.primitivesr r �)cryptography.hazmat.primitives.asymmetricr r r r� r r) r- r2 r@ rE rF r^ r[ rc rb r� r r r r �<module> s" � r
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