a
     `'/                     @   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   I/usr/lib/python3/dist-packages/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s^| 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_IS_LIBRESSLZEC_GROUP_get_asn1_flagZ
OBJ_nid2snstringdecode)backendZec_keygroupZ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   s8   zt j|  W S  ty2   td|tjY n0 d S )Nz${} is not a supported elliptic curve)r   Z_CURVE_TYPESKeyErrorr   formatr   ZUNSUPPORTED_ELLIPTIC_CURVE)r    r"   r   r   r   _sn_to_elliptic_curveL   s    r'   c                 C   sz   | j |j}| |dk | jd|}| jdd}| j d|t||||j}| |dk | j|d |d  S )Nr   zunsigned char[]zunsigned int[]   )	r   Z
ECDSA_size_ec_keyr   r   newZ
ECDSA_signlenbuffer)r    private_keydataZmax_sizeZsigbufZ
siglen_ptrresr   r   r   _ecdsa_sig_signV   s    r0   c                 C   s8   | j d|t||t||j}|dkr4|   td S )Nr   r(   )r   ZECDSA_verifyr+   r)   Z_consume_errorsr   )r    
public_key	signaturer.   r/   r   r   r   _ecdsa_sig_verifyc   s    r3   c                   @   s$   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 r5   r9   updater:   r.   r   r   r   r>   s   s    z_ECDSASignatureContext.updatec                 C   s   | j  }t| j| j|S r5   )r9   finalizer0   r6   r7   r:   Zdigestr   r   r   r@   v   s    
z_ECDSASignatureContext.finalizeN)__name__
__module____qualname__r<   r>   r@   r   r   r   r   r4   l   s   r4   c                   @   s$   e Zd Zdd Zdd Zdd ZdS )_ECDSAVerificationContextc                 C   s$   || _ || _|| _t||| _d S r5   )r6   _public_key
_signaturer   r8   r9   )r:   r    r1   r2   r;   r   r   r   r<   ~   s    z"_ECDSAVerificationContext.__init__c                 C   s   | j | d S r5   r=   r?   r   r   r   r>      s    z _ECDSAVerificationContext.updatec                 C   s"   | j  }t| j| j| j| d S r5   )r9   r@   r3   r6   rF   rG   rA   r   r   r   verify   s    
z _ECDSAVerificationContext.verifyN)rB   rC   rD   r<   r>   rH   r   r   r   r   rE   |   s   rE   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 r5   r6   r)   	_evp_pkeyr#   r'   _curver$   r:   r    Zec_key_cdataevp_pkeyr"   r   r   r   r<      s    
z!_EllipticCurvePrivateKey.__init__rL   c                 C   s   | j jS r5   curvekey_sizer:   r   r   r   rQ      s    z!_EllipticCurvePrivateKey.key_sizec                 C   s(   t   t| t|j t| j| |jS r5   )r   r   r
   r;   r4   r6   )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[])r6   Z+elliptic_curve_exchange_algorithm_supportedrP   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   s0    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(   )r6   r   r   r)   r   r   r   r   Z_ec_key_new_by_curve_nidrX   ZEC_KEY_set_public_keyZ_ec_cdata_to_evp_pkey_EllipticCurvePublicKey)r:   r!   Z	curve_nidZpublic_ec_keypointr/   rN   r   r   r   r1      s    z#_EllipticCurvePrivateKey.public_keyc                 C   s2   | j j| j}| j |}tj||   dS )N)private_valuepublic_numbers)	r6   r   ZEC_KEY_get0_private_keyr)   
_bn_to_intr   ZEllipticCurvePrivateNumbersr1   r^   )r:   Zbnr]   r   r   r   private_numbers   s    
z(_EllipticCurvePrivateKey.private_numbersc                 C   s   | j |||| | j| jS r5   )r6   Z_private_key_bytesrK   r)   )r:   encodingr&   Zencryption_algorithmr   r   r   private_bytes   s    z&_EllipticCurvePrivateKey.private_bytesc                 C   s*   t | t| j||j\}}t| j| |S r5   )r   r	   r6   
_algorithmr0   )r:   r.   r   r;   r   r   r   sign   s
    
z_EllipticCurvePrivateKey.signN)rB   rC   rD   r<   r   read_only_propertyrP   propertyrQ   rS   rZ   r1   r`   rb   rd   r   r   r   r   rI      s   	


rI   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 r5   rJ   rM   r   r   r   r<      s    
z _EllipticCurvePublicKey.__init__rL   c                 C   s   | j jS r5   rO   rR   r   r   r   rQ      s    z _EllipticCurvePublicKey.key_sizec                 C   s6   t   td| t| t|j t| j| ||jS )Nr2   )r   r   _check_bytesr   r
   r;   rE   r6   )r:   r2   r   r   r   r   verifier  s    
z _EllipticCurvePublicKey.verifierc           
      C   s   | j | j\}}| j j| j}| j || j jjk | j  d}| j j	|}| j j	|}||||||}| j |dk | j 
|}| j 
|}	W d    n1 s0    Y  tj||	| jdS )Nr(   )xyrP   )r6   Z _ec_key_determine_group_get_funcr)   r   rX   r   r   r   _tmp_bn_ctxZ
BN_CTX_getr_   r   ZEllipticCurvePublicNumbersrL   )
r:   Zget_funcr!   r\   bn_ctxZbn_xZbn_yr/   ri   rj   r   r   r   r^     s    *z&_EllipticCurvePublicKey.public_numbersc           	   	   C   s&  |t jju r| jjj}n|t jju s(J | jjj}| jj| j	}| j
|| jjjk | jj| j	}| j
|| jjjk | j v}| jj|||| jjjd|}| j
|dk | jjd|}| jj||||||}| j
||k W d    n1 s0    Y  | jj|d d  S )Nr   zchar[])r   PublicFormatCompressedPointr6   r   ZPOINT_CONVERSION_COMPRESSEDUncompressedPointZPOINT_CONVERSION_UNCOMPRESSEDr   r)   r   r   r   rX   rk   ZEC_POINT_point2octr*   r,   )	r:   r&   
conversionr!   r\   rl   ZbuflenZbufr/   r   r   r   _encode_point  s&    
0z%_EllipticCurvePublicKey._encode_pointc                 C   sp   |t jju s$|t jju s$|t jju rV|t jjusD|t jjt jjfvrLtd| |S | j	||| | j
d S d S )NzKX962 encoding must be used with CompressedPoint or UncompressedPoint format)r   ZEncodingZX962rm   rn   ro   rW   rq   r6   Z_public_key_bytesrK   )r:   ra   r&   r   r   r   public_bytes6  s"    



z$_EllipticCurvePublicKey.public_bytesc                 C   s0   t | t| j||j\}}t| j| || d S r5   )r   r	   r6   rc   r3   )r:   r2   r.   r   r;   r   r   r   rH   L  s
    
z_EllipticCurvePublicKey.verifyN)rB   rC   rD   r<   r   re   rP   rf   rQ   rh   r^   rq   rr   rH   r   r   r   r   r[      s   	


r[   N)#Z
__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'   r0   r3   Zregister_interfaceobjectr4   rE   Z(EllipticCurvePrivateKeyWithSerializationrI   Z'EllipticCurvePublicKeyWithSerializationr[   r   r   r   r   <module>   s&   
	
a
