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3
l_C                 @   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 d dlmZmZmZ d dlmZmZmZmZmZmZ d dlmZmZ d	d
 Zdd Zdd Z dd Z!dd Z"dd Z#dd Z$ej%eG dd de&Z'ej%eG dd de&Z(ej%eG dd de&Z)ej%eG dd de&Z*dS )     )absolute_importdivisionprint_function)utils)InvalidSignatureUnsupportedAlgorithm_Reasons)_calculate_digest_and_algorithm_check_not_prehashed_warn_sign_verify_deprecated)hashes)AsymmetricSignatureContextAsymmetricVerificationContextrsa)AsymmetricPaddingMGF1OAEPPKCS1v15PSScalculate_max_pss_salt_length)RSAPrivateKeyWithSerializationRSAPublicKeyWithSerializationc             C   s,   | j }|tjks|tjkr$t||S |S d S )N)Z_salt_lengthr   Z
MAX_LENGTHr   r   )ZpsskeyZhash_algorithmZsalt r   /usr/lib64/python3.6/rsa.py_get_rsa_pss_salt_length&   s    
r   c             C   s   t |tstdt |tr&| jj}nVt |trh| jj}t |jt	sPt
dtj| j|s|t
dtjnt
dj|jtjt| ||||S )Nz1Padding must be an instance of AsymmetricPadding.z'Only MGF1 is supported by this backend.zPThis combination of padding and hash algorithm is not supported by this backend.z${} is not supported by this backend.)
isinstancer   	TypeErrorr   _libRSA_PKCS1_PADDINGr   ZRSA_PKCS1_OAEP_PADDING_mgfr   r   r   UNSUPPORTED_MGFZrsa_padding_supportedUNSUPPORTED_PADDINGformatname_enc_dec_rsa_pkey_ctx)backendr   datapaddingpadding_enumr   r   r   _enc_dec_rsa/   s$    






r*   c             C   s  t |tr| jj}| jj}n| jj}| jj}| jj|j| j	j
}| j|| j	j
k | j	j|| jj}||}| j|dk | jj||}| j|dk | jj|j}	| j|	dk t |to| jjr| j|jj}
| jj||
}| j|dk | j|j}| jj||}| j|dk t |tr|jd k	rt|jdkr| jjt|j}| j|| j	j
k | j	j||jt|j | jj||t|j}| j|dk | j	jd|	}| j	jd|	}|||||t|}| j	j|d |d  }| jj  |dkrtd|S )N   r   zsize_t *zunsigned char[]zEncryption/decryption failed.) r   _RSAPublicKeyr   ZEVP_PKEY_encrypt_initZEVP_PKEY_encryptZEVP_PKEY_decrypt_initZEVP_PKEY_decryptEVP_PKEY_CTX_new	_evp_pkey_ffiNULLopenssl_assertgcEVP_PKEY_CTX_freeEVP_PKEY_CTX_set_rsa_paddingEVP_PKEY_sizer   ZCryptography_HAS_RSA_OAEP_MD_evp_md_non_null_from_algorithmr    
_algorithmEVP_PKEY_CTX_set_rsa_mgf1_mdZEVP_PKEY_CTX_set_rsa_oaep_mdZ_labellenZOPENSSL_mallocZmemmoveZ EVP_PKEY_CTX_set0_rsa_oaep_labelnewbufferZERR_clear_error
ValueError)r&   r   r'   r)   r(   ZinitZcryptpkey_ctxresZbuf_sizemgf1_mdZoaep_mdZlabelptrZoutlenbufZresbufr   r   r   r%   N   sN    




r%   c             C   s   t |tstd| jj|j}| j|dk t |trB| jj}nZt |t	rt |j
tsdtdtj||j d dk r~td| jj}ntdj|jtj|S )Nz'Expected provider of AsymmetricPadding.r   z'Only MGF1 is supported by this backend.   zDDigest too large for key size. Use a larger key or different digest.z${} is not supported by this backend.)r   r   r   r   r5   r.   r1   r   r   r   r    r   r   r   r!   Zdigest_sizer<   ZRSA_PKCS1_PSS_PADDINGr#   r$   r"   )r&   r   r(   	algorithmZ	pkey_sizer)   r   r   r   _rsa_sig_determine_padding   s&    





rC   c             C   s  t | |||}| j|}| jj|j| jj}| j|| jjk | jj|| jj	}||}	| j|	dk | jj
||}	|	dkr| j  tdj|jtj| jj||}	| j|	dk t|tr| jj|t|||}	| j|	dk | j|jj}
| jj||
}	| j|	dk |S )Nr+   r   z4{} is not supported by this backend for RSA signing.)rC   r6   r   r-   r.   r/   r0   r1   r2   r3   ZEVP_PKEY_CTX_set_signature_md_consume_errorsr   r#   r$   r   ZUNSUPPORTED_HASHr4   r   r   Z EVP_PKEY_CTX_set_rsa_pss_saltlenr   r    r7   r8   )r&   r(   rB   r   r'   Z	init_funcr)   Zevp_mdr=   r>   r?   r   r   r   _rsa_sig_setup   s2    

rE   c       
      C   s   t | ||||| jj}| jjd}| jj|| jj||t|}| j|dk | jjd|d }| jj||||t|}|dkr| j	 }	t
d|	| jj|d d  S )Nzsize_t *r+   zunsigned char[]r   zuDigest or salt length too long for key size. Use a larger key or shorter salt length if you are specifying a PSS salt)rE   r   ZEVP_PKEY_sign_initr/   r:   ZEVP_PKEY_signr0   r9   r1   _consume_errors_with_textr<   r;   )
r&   r(   rB   private_keyr'   r=   Zbuflenr>   r@   errorsr   r   r   _rsa_sig_sign   s&    
rI   c             C   sX   t | ||||| jj}| jj||t||t|}| j|dk |dkrT| j  td S )Nr   )rE   r   ZEVP_PKEY_verify_initZEVP_PKEY_verifyr9   r1   rD   r   )r&   r(   rB   
public_key	signaturer'   r=   r>   r   r   r   _rsa_sig_verify   s    
rL   c               @   s$   e Zd Zdd Zdd Zdd ZdS )_RSASignatureContextc             C   s<   || _ || _t|||| || _|| _tj| j| j | _d S )N)_backend_private_keyrC   _paddingr7   r   Hash	_hash_ctx)selfr&   rG   r(   rB   r   r   r   __init__   s    z_RSASignatureContext.__init__c             C   s   | j j| d S )N)rR   update)rS   r'   r   r   r   rU     s    z_RSASignatureContext.updatec             C   s   t | j| j| j| j| jj S )N)rI   rN   rP   r7   rO   rR   finalize)rS   r   r   r   rV     s    z_RSASignatureContext.finalizeN)__name__
__module____qualname__rT   rU   rV   r   r   r   r   rM      s   rM   c               @   s$   e Zd Zdd Zdd Zdd ZdS )_RSAVerificationContextc             C   sF   || _ || _|| _|| _t|||| |}|| _tj| j| j | _d S )N)	rN   _public_key
_signaturerP   rC   r7   r   rQ   rR   )rS   r&   rJ   rK   r(   rB   r   r   r   rT     s    z _RSAVerificationContext.__init__c             C   s   | j j| d S )N)rR   rU   )rS   r'   r   r   r   rU   (  s    z_RSAVerificationContext.updatec             C   s"   t | j| j| j| j| j| jj S )N)rL   rN   rP   r7   r[   r\   rR   rV   )rS   r   r   r   verify+  s    z_RSAVerificationContext.verifyN)rW   rX   rY   rT   rU   r]   r   r   r   r   rZ     s   rZ   c               @   sN   e Zd Zdd ZejdZdd Zdd Zdd	 Z	d
d Z
dd Zdd ZdS )_RSAPrivateKeyc             C   s   |j j|}|dkr&|j }td||j j||jj}|j|dk || _|| _	|| _
| jjjd}| jj j| j	|| jjj| jjj | jj|d | jjjk | jj j|d | _d S )Nr+   zInvalid private keyz	BIGNUM **r   )r   ZRSA_check_keyrF   r<   ZRSA_blinding_onr/   r0   r1   rN   
_rsa_cdatar.   r:   RSA_get0_keyBN_num_bits	_key_size)rS   r&   	rsa_cdataevp_pkeyr>   rH   nr   r   r   rT   8  s"    
z_RSAPrivateKey.__init__rb   c             C   s   t   t| t| j| ||S )N)r   r
   rM   rN   )rS   r(   rB   r   r   r   signerS  s    z_RSAPrivateKey.signerc             C   s2   | j d d }|t|kr"tdt| j| ||S )N      z,Ciphertext length must be equal to key size.)key_sizer9   r<   r*   rN   )rS   Z
ciphertextr(   Zkey_size_bytesr   r   r   decryptX  s    z_RSAPrivateKey.decryptc             C   sV   | j jj| j}| j j|| j jjk | j jj|| j jj}| j j	|}t
| j ||S )N)rN   r   ZRSAPublicKey_dupr_   r1   r/   r0   r2   ZRSA_freeZ_rsa_cdata_to_evp_pkeyr,   )rS   Zctxrd   r   r   r   rJ   _  s
    z_RSAPrivateKey.public_keyc       	      C   s  | j jjd}| j jjd}| j jjd}| j jjd}| j jjd}| j jjd}| j jjd}| j jjd}| j jj| j||| | j j|d | j jjk | j j|d | j jjk | j j|d | j jjk | j jj| j|| | j j|d | j jjk | j j|d | j jjk | j jj	| j||| | j j|d | j jjk | j j|d | j jjk | j j|d | j jjk t
j| j j|d | j j|d | j j|d | j j|d | j j|d | j j|d t
j| j j|d | j j|d ddS )Nz	BIGNUM **r   )ere   )pqddmp1dmq1iqmppublic_numbers)rN   r/   r:   r   r`   r_   r1   r0   ZRSA_get0_factorsZRSA_get0_crt_paramsr   ZRSAPrivateNumbers
_bn_to_intRSAPublicNumbers)	rS   re   rk   rn   rl   rm   ro   rp   rq   r   r   r   private_numbersf  s<    z_RSAPrivateKey.private_numbersc             C   s   | j j|||| | j| jS )N)rN   Z_private_key_bytesr.   r_   )rS   encodingr#   Zencryption_algorithmr   r   r   private_bytes  s    z_RSAPrivateKey.private_bytesc             C   s$   t | j||\}}t| j||| |S )N)r	   rN   rI   )rS   r'   r(   rB   r   r   r   sign  s    z_RSAPrivateKey.signN)rW   rX   rY   rT   r   read_only_propertyri   rf   rj   rJ   ru   rw   rx   r   r   r   r   r^   6  s   
#
r^   c               @   sF   e Zd Zdd ZejdZdd Zdd Zdd	 Z	d
d Z
dd ZdS )r,   c             C   st   || _ || _|| _| j jjd}| j jj| j|| j jj| j jj | j j|d | j jjk | j jj	|d | _
d S )Nz	BIGNUM **r   )rN   r_   r.   r/   r:   r   r`   r0   r1   ra   rb   )rS   r&   rc   rd   re   r   r   r   rT     s    z_RSAPublicKey.__init__rb   c             C   s,   t   tjd| t| t| j| |||S )NrK   )r   r   _check_bytesr
   rZ   rN   )rS   rK   r(   rB   r   r   r   verifier  s
    z_RSAPublicKey.verifierc             C   s   t | j| ||S )N)r*   rN   )rS   Z	plaintextr(   r   r   r   encrypt  s    z_RSAPublicKey.encryptc             C   s   | j jjd}| j jjd}| j jj| j||| j jj | j j|d | j jjk | j j|d | j jjk tj	| j j
|d | j j
|d dS )Nz	BIGNUM **r   )rk   re   )rN   r/   r:   r   r`   r_   r0   r1   r   rt   rs   )rS   re   rk   r   r   r   rr     s    z_RSAPublicKey.public_numbersc             C   s   | j j||| | j| jS )N)rN   Z_public_key_bytesr.   r_   )rS   rv   r#   r   r   r   public_bytes  s    z_RSAPublicKey.public_bytesc             C   s&   t | j||\}}t| j||| ||S )N)r	   rN   rL   )rS   rK   r'   r(   rB   r   r   r   r]     s    z_RSAPublicKey.verifyN)rW   rX   rY   rT   r   ry   ri   r{   r|   rr   r}   r]   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   Z)cryptography.hazmat.primitives.asymmetricr   r   r   Z1cryptography.hazmat.primitives.asymmetric.paddingr   r   r   r   r   r   Z-cryptography.hazmat.primitives.asymmetric.rsar   r   r   r*   r%   rC   rE   rI   rL   Zregister_interfaceobjectrM   rZ   r^   r,   r   r   r   r   <module>   s,    	;""c