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This causes OpenSSL to serialize EC keys along with their curve OID which makes deserialization easier. N)r ZEC_KEY_set_asn1_flagZOPENSSL_EC_NAMED_CURVE)r Zec_cdatar r r �_mark_asn1_named_ec_curveB s �r$ c C s8 zt j| � W S ty2 td�|�tj��Y n0 d S )Nz${} is not a supported elliptic curve)r Z _CURVE_TYPES�KeyErrorr �formatr ZUNSUPPORTED_ELLIPTIC_CURVE)r r" r r r �_sn_to_elliptic_curveN s �r' c C sz | j �|j�}| �|dk� | j�d|�}| j�dd�}| j �d|t|�|||j�}| �|dk� | j�|�d |d � S )Nr zunsigned char[]zunsigned int[]� ) r Z ECDSA_size�_ec_keyr r �newZ ECDSA_sign�len�buffer)r � private_key�data�max_sizeZsigbufZ siglen_ptr�resr r r �_ecdsa_sig_signX s �r1 c C s8 | j �d|t|�|t|�|j�}|dkr4| �� t�d S )Nr r( )r Z ECDSA_verifyr+ r) Z_consume_errorsr )r � public_key� signaturer. r0 r r r �_ecdsa_sig_verifye s �r4 c @ s> e Zd Zejejd�dd�Zedd�dd�Z ed�d d �Z dS ) �_ECDSASignatureContext)r- � algorithmc C s || _ || _t�||�| _d S �N)�_backend� _private_keyr �Hash�_digest)�selfr r- r6 r r r �__init__o s z _ECDSASignatureContext.__init__N�r. �returnc C s | j �|� d S r7 �r; �update�r< r. r r r rA y s z _ECDSASignatureContext.update�r? c C s | j �� }t| j| j|�S r7 )r; �finalizer1 r8 r9 �r< �digestr r r rD | s z _ECDSASignatureContext.finalize) �__name__� __module__� __qualname__r �EllipticCurvePrivateKeyr � HashAlgorithmr= �bytesrA rD r r r r r5 n s � r5 c @ s@ e Zd Zejeejd�dd�Zedd�dd�Z dd�d d �Z dS ) �_ECDSAVerificationContext)r2 r3 r6 c C s$ || _ || _|| _t�||�| _d S r7 )r8 � _public_key� _signaturer r: r; )r< r r2 r3 r6 r r r r= � s z"_ECDSAVerificationContext.__init__Nr> c C s | j �|� d S r7 r@ rB r r r rA � s z _ECDSAVerificationContext.updaterC c C s" | j �� }t| j| j| j|� d S r7 )r; rD r4 r8 rN rO rE r r r �verify� s �z _ECDSAVerificationContext.verify) rG rH rI r �EllipticCurvePublicKeyrL r rK r= rA rP r r r r rM � s � rM c @ s� e Zd Zdd� Ze�d�Zeed�dd��Z e j e d�dd �Z e je jed �d d �Ze jd�d d�Ze jd�dd�Zejejejed�dd�Zee j ed�dd�ZdS )�_EllipticCurvePrivateKeyc C s6 || _ || _|| _t||�}t||�| _t||� d S r7 �r8 r) � _evp_pkeyr# r' �_curver$ �r< r Z ec_key_cdata�evp_pkeyr" r r r r= � s z!_EllipticCurvePrivateKey.__init__rU rC c C s | j jS r7 ��curve�key_size�r< r r r rZ � s z!_EllipticCurvePrivateKey.key_size)r r? c C s: t � t|� t|j� t|jtj�s*J �t| j| |j�S r7 ) r r r r6 r r rK r5 r8 )r< r r r r �signer� s �z _EllipticCurvePrivateKey.signer)r6 �peer_public_keyr? c C sD | j �|| j�s tdtj��|jj| jjkr4td��t| j | j |�S )Nz1This backend does not support the ECDH algorithm.z2peer_public_key and self are not on the same curve) r8 Z+elliptic_curve_exchange_algorithm_supportedrY r r Z UNSUPPORTED_EXCHANGE_ALGORITHM�namer r rT )r< r6 r] r r r �exchange� s ����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 )Nr( ) r8 r r r) r r r r Z_ec_key_new_by_curve_nid�EC_KEY_get0_public_keyZEC_KEY_set_public_keyZ_ec_cdata_to_evp_pkey�_EllipticCurvePublicKey)r< r Z curve_nidZ public_ec_key�pointr0 rW r r r r2 � s z#_EllipticCurvePrivateKey.public_keyc C s2 | j j�| j�}| j �|�}tj|| �� �� d�S )N)� private_value�public_numbers) r8 r ZEC_KEY_get0_private_keyr) � _bn_to_intr �EllipticCurvePrivateNumbersr2 rd )r< Zbnrc r r r �private_numbers� s �z(_EllipticCurvePrivateKey.private_numbers)�encodingr& �encryption_algorithmr? c C s | j �|||| | j| j�S r7 )r8 Z_private_key_bytesrT r) )r< rh r& ri r r r � private_bytes� s �z&_EllipticCurvePrivateKey.private_bytes)r. r r? c C s* t |� t| j||j�\}}t| j| |�S r7 )r r r8 � _algorithmr1 )r< r. r r6 r r r �sign� s �z _EllipticCurvePrivateKey.signN)rG rH rI r= r �read_only_propertyrY �property�intrZ r � EllipticCurveSignatureAlgorithmr r\ ZECDHrQ rL r_ r2 rf rg r �EncodingZ PrivateFormatZKeySerializationEncryptionrj rl r r r r rR � s* � � � �rR c @ s� e Zd Zdd� Ze�d�Zeed�dd��Z e e j e d�dd �Ze jd�d d �Zeje d �d d�Zejeje d�dd�Ze e e j dd�dd�ZdS )ra c C s6 || _ || _|| _t||�}t||�| _t||� d S r7 rS rV r r r r= s z _EllipticCurvePublicKey.__init__rU rC c C s | j jS r7 rX r[ r r r rZ s z _EllipticCurvePublicKey.key_size)r3 r r? c C sH t � t�d|� t|� t|j� t|jtj�s6J �t | j | ||j�S )Nr3 ) r r � _check_bytesr r r6 r r rK rM r8 )r< r3 r r r r �verifier s �z _EllipticCurvePublicKey.verifierc C s� | j �| j�\}}| j j�| j�}| j �|| j jjk� | j �� �d}| j j� |�}| j j� |�}||||||�}| j �|dk� | j � |�}| j � |�} W d � n1 s�0 Y t j || | j d�S )Nr( )�x�yrY )r8 Z _ec_key_determine_group_get_funcr) r r` r r r � _tmp_bn_ctxZ BN_CTX_getre r �EllipticCurvePublicNumbersrU ) r< Zget_funcr rb �bn_ctxZbn_xZbn_yr0 rt ru r r r rd s � *z&_EllipticCurvePublicKey.public_numbers)r& r? c C s& |t jju r| jjj}n|t jju s(J �| jjj}| jj�| j �}| j� || jj j k� | jj� | j �}| j� || jj j k� | j�� �v}| jj�|||| jj j d|�}| j� |dk� | jj �d|�}| jj�||||||�}| j� ||k� W d � n1 �s0 Y | jj �|�d d � S )Nr zchar[])r � PublicFormat�CompressedPointr8 r ZPOINT_CONVERSION_COMPRESSED�UncompressedPointZ POINT_CONVERSION_UNCOMPRESSEDr r) r r r r` rv ZEC_POINT_point2octr* r, ) r< r& � conversionr rb rx �buflen�bufr0 r r r � _encode_point2 s& � �0z%_EllipticCurvePublicKey._encode_point)rh r& r? c C sp |t jju s$|t jju s$|t jju rV|t jjusD|t jjt jjfvrLtd��| �|�S | j� ||| | j d �S d S )NzKX962 encoding must be used with CompressedPoint or UncompressedPoint format) r rq ZX962ry rz r{ r r r8 Z_public_key_bytesrT )r< rh r& r r r � public_bytesJ s" � � ��� �z$_EllipticCurvePublicKey.public_bytesN)r3 r. r r? c C s0 t |� t| j||j�\}}t| j| ||� d S r7 )r r r8 rk r4 )r< r3 r. r r6 r r r rP c s �z _EllipticCurvePublicKey.verify)rG rH rI r= r rm rY rn ro rZ rL r rp r rs rw rd r ry r rq r� rP r r r r ra � s& � � �ra N) Z cryptographyr Zcryptography.exceptionsr r r Z*cryptography.hazmat.backends.openssl.utilsr r r r Z cryptography.hazmat.primitivesr r Z)cryptography.hazmat.primitives.asymmetricr r r rp r r# r$ r' r1 r4 r5 rM rJ rR rQ ra r r r r �<module> s � f
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