U
    *}f5/                     @   s  d dl mZmZmZ d dlmZ d dlmZmZm	Z	 d dl
mZmZmZ d dlmZmZ d dlmZmZmZ dd Zd	d
 Zdd Zdd Zdd Zdd ZeeG dd deZeeG dd deZeejG dd deZ eej!G dd deZ"dS )    )absolute_importdivisionprint_function)utils)InvalidSignatureUnsupportedAlgorithm_Reasons)_calculate_digest_and_algorithm_check_not_prehashed_warn_sign_verify_deprecated)hashesserialization)AsymmetricSignatureContextAsymmetricVerificationContextecc                 C   s   t | tjstdtjd S )Nz/Unsupported elliptic curve signature algorithm.)
isinstancer   ZECDSAr   r   Z UNSUPPORTED_PUBLIC_KEY_ALGORITHM)signature_algorithm r   K/tmp/pip-unpacked-wheel-x36vw73o/cryptography/hazmat/backends/openssl/ec.py_check_signature_algorithm   s
    r   c                 C   s   | j |}| || jjk | j |}|| j jkr>td| j jr^| j 	|dkr^td| j 
|}| || jjk | 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_nameZ	NID_undefNotImplementedErrorZ$CRYPTOGRAPHY_OPENSSL_102U_OR_GREATERZEC_GROUP_get_asn1_flagZ
OBJ_nid2snstringdecode)backendZec_keygroupnidZ
curve_namesnr   r   r   _ec_key_curve_sn"   s$    r$   c                 C   s   | j || j j dS )z
    Set the named curve flag on the EC_KEY. This causes OpenSSL to
    serialize EC keys along with their curve OID which makes
    deserialization easier.
    N)r   ZEC_KEY_set_asn1_flagZOPENSSL_EC_NAMED_CURVE)r    Zec_cdatar   r   r   _mark_asn1_named_ec_curve@   s     r%   c                 C   s:   zt j|  W S  tk
r4   td|tjY nX d S )Nz${} is not a supported elliptic curve)r   Z_CURVE_TYPESKeyErrorr   formatr   ZUNSUPPORTED_ELLIPTIC_CURVE)r    r#   r   r   r   _sn_to_elliptic_curveL   s    r(   c                 C   sz   | j |j}| |dk | jd|}| jdd}| j d|t||||j}| |dk | j|d |d  S )Nr   zunsigned char[]zunsigned int[]   )	r   Z
ECDSA_size_ec_keyr   r   newZ
ECDSA_signlenbuffer)r    private_keydatamax_sizeZsigbufZ
siglen_ptrresr   r   r   _ecdsa_sig_signV   s         r2   c                 C   s8   | j d|t||t||j}|dkr4|   td S )Nr   r)   )r   ZECDSA_verifyr,   r*   Z_consume_errorsr   )r    
public_key	signaturer/   r1   r   r   r   _ecdsa_sig_verifyc   s         r5   c                   @   s$   e Zd Zdd Zdd Zdd ZdS )_ECDSASignatureContextc                 C   s   || _ || _t||| _d S N)_backend_private_keyr   Hash_digest)selfr    r.   	algorithmr   r   r   __init__n   s    z_ECDSASignatureContext.__init__c                 C   s   | j | d S r7   r;   updater<   r/   r   r   r   r@   s   s    z_ECDSASignatureContext.updatec                 C   s   | j  }t| j| j|S r7   )r;   finalizer2   r8   r9   r<   digestr   r   r   rB   v   s    
z_ECDSASignatureContext.finalizeN)__name__
__module____qualname__r>   r@   rB   r   r   r   r   r6   l   s   r6   c                   @   s$   e Zd Zdd Zdd Zdd ZdS )_ECDSAVerificationContextc                 C   s$   || _ || _|| _t||| _d S r7   )r8   _public_key
_signaturer   r:   r;   )r<   r    r3   r4   r=   r   r   r   r>   ~   s    z"_ECDSAVerificationContext.__init__c                 C   s   | j | d S r7   r?   rA   r   r   r   r@      s    z _ECDSAVerificationContext.updatec                 C   s"   | j  }t| j| j| j| d S r7   )r;   rB   r5   r8   rI   rJ   rC   r   r   r   verify   s    
   z _ECDSAVerificationContext.verifyN)rE   rF   rG   r>   r@   rK   r   r   r   r   rH   |   s   rH   c                   @   sZ   e Zd Zdd ZedZedd Zdd Z	dd	 Z
d
d Zdd Zdd Zdd ZdS )_EllipticCurvePrivateKeyc                 C   s6   || _ || _|| _t||}t||| _t|| d S r7   r8   r*   	_evp_pkeyr$   r(   _curver%   r<   r    Zec_key_cdataevp_pkeyr#   r   r   r   r>      s    
z!_EllipticCurvePrivateKey.__init__rO   c                 C   s   | j jS r7   curvekey_sizer<   r   r   r   rT      s    z!_EllipticCurvePrivateKey.key_sizec                 C   s(   t   t| t|j t| j| |jS r7   )r   r   r
   r=   r6   r8   )r<   r   r   r   r   signer   s    
  z_EllipticCurvePrivateKey.signerc                 C   s   | j || jstdtj|jj| jjkr4td| j j	| j
}| j j|d d }| j |dk | j jd|}| j j|j
}| j j|||| j
| j jj}| j |dk | 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[])r8   Z+elliptic_curve_exchange_algorithm_supportedrS   r   r   ZUNSUPPORTED_EXCHANGE_ALGORITHMname
ValueErrorr   r   r*   ZEC_GROUP_get_degreer   r   r+   EC_KEY_get0_public_keyZECDH_compute_keyr   r-   )r<   r=   Zpeer_public_keyr!   Zz_lenZz_bufZpeer_keyrr   r   r   exchange   s:         z!_EllipticCurvePrivateKey.exchangec                 C   s   | j j| j}| j || j jjk | j j|}| j |}| j j	| j}| j || j jjk | j j
||}| j |dk | j |}t| j ||S )Nr)   )r8   r   r   r*   r   r   r   r   Z_ec_key_new_by_curve_nidr[   ZEC_KEY_set_public_keyZ_ec_cdata_to_evp_pkey_EllipticCurvePublicKey)r<   r!   Z	curve_nidZpublic_ec_keypointr1   rQ   r   r   r   r3      s    z#_EllipticCurvePrivateKey.public_keyc                 C   s2   | j j| j}| j |}tj||   dS )N)private_valuepublic_numbers)	r8   r   ZEC_KEY_get0_private_keyr*   
_bn_to_intr   ZEllipticCurvePrivateNumbersr3   ra   )r<   Zbnr`   r   r   r   private_numbers   s    
z(_EllipticCurvePrivateKey.private_numbersc                 C   s   | j |||| | j| jS r7   )r8   Z_private_key_bytesrN   r*   )r<   encodingr'   Zencryption_algorithmr   r   r   private_bytes   s    z&_EllipticCurvePrivateKey.private_bytesc                 C   s*   t | t| j||j\}}t| j| |S r7   )r   r	   r8   
_algorithmr2   )r<   r/   r   r=   r   r   r   sign   s      z_EllipticCurvePrivateKey.signN)rE   rF   rG   r>   r   read_only_propertyrS   propertyrT   rV   r]   r3   rc   re   rg   r   r   r   r   rL      s   	


rL   c                   @   sR   e Zd Zdd ZedZedd Zdd Z	dd	 Z
d
d Zdd Zdd ZdS )r^   c                 C   s6   || _ || _|| _t||}t||| _t|| d S r7   rM   rP   r   r   r   r>      s    
z _EllipticCurvePublicKey.__init__rO   c                 C   s   | j jS r7   rR   rU   r   r   r   rT      s    z _EllipticCurvePublicKey.key_sizec                 C   s6   t   td| t| t|j t| j| ||jS )Nr4   )r   r   _check_bytesr   r
   r=   rH   r8   )r<   r4   r   r   r   r   verifier  s    
   z _EllipticCurvePublicKey.verifierc           
   	   C   s   | j | j\}}| j j| j}| j || j jjk | j  Z}| j j	|}| j j	|}||||||}| j |dk | j 
|}| j 
|}	W 5 Q R X tj||	| jdS )Nr)   )xyrS   )r8   Z _ec_key_determine_group_get_funcr*   r   r[   r   r   r   _tmp_bn_ctxZ
BN_CTX_getrb   r   ZEllipticCurvePublicNumbersrO   )
r<   Zget_funcr!   r_   bn_ctxZbn_xZbn_yr1   rl   rm   r   r   r   ra     s    z&_EllipticCurvePublicKey.public_numbersc           	   	   C   s  |t jjkr| jjj}n|t jjks(t| jjj}| jj	| j
}| j|| jjjk | jj| j
}| j|| jjjk | j l}| jj|||| jjjd|}| j|dk | jjd|}| jj||||||}| j||k W 5 Q R X | jj|d d  S )Nr   zchar[])r   PublicFormatCompressedPointr8   r   ZPOINT_CONVERSION_COMPRESSEDUncompressedPointAssertionErrorZPOINT_CONVERSION_UNCOMPRESSEDr   r*   r   r   r   r[   rn   ZEC_POINT_point2octr+   r-   )	r<   r'   
conversionr!   r_   ro   buflenbufr1   r   r   r   _encode_point  s:    
          z%_EllipticCurvePublicKey._encode_pointc                 C   sp   |t jjks$|t jjks$|t jjkrV|t jjk	sD|t jjt jjfkrLtd| |S | j	||| | j
d S d S )NzKX962 encoding must be used with CompressedPoint or UncompressedPoint format)r   EncodingZX962rp   rq   rr   rZ   rw   r8   Z_public_key_bytesrN   )r<   rd   r'   r   r   r   public_bytes6  s*    



    z$_EllipticCurvePublicKey.public_bytesc                 C   s0   t | t| j||j\}}t| j| || d S r7   )r   r	   r8   rf   r5   )r<   r4   r/   r   r=   r   r   r   rK   L  s      z_EllipticCurvePublicKey.verifyN)rE   rF   rG   r>   r   rh   rS   ri   rT   rk   ra   rw   ry   rK   r   r   r   r   r^      s   	


r^   N)#
__future__r   r   r   Zcryptographyr   Zcryptography.exceptionsr   r   r   Z*cryptography.hazmat.backends.openssl.utilsr	   r
   r   Zcryptography.hazmat.primitivesr   r   Z)cryptography.hazmat.primitives.asymmetricr   r   r   r   r$   r%   r(   r2   r5   Zregister_interfaceobjectr6   rH   Z(EllipticCurvePrivateKeyWithSerializationrL   Z'EllipticCurvePublicKeyWithSerializationr^   r   r   r   r   <module>   s&   
	
a
