9ih!SSKJr SSKrSSKJr SSKrSSKJrJrJ r SSK J r SSKJ r SSK Jr "S S 5rS S jrg) )MGF1N) _copy_bytes)ceil_div bytes_to_long long_to_bytes)strxor)Random) oaep_decodec6\rSrSrSrSrSrSrSrSr Sr g ) PKCS1OAEP_Cipher"zTCipher object for PKCS#1 v1.5 OAEP. Do not create directly: use :func:`new` instead.c^UTlU(aUTlO[RRTlU(aUTlO U4SjTl[ SSU5TlUTlg)a]Initialize this PKCS#1 OAEP cipher object. :Parameters: key : an RSA key object If a private half is given, both encryption and decryption are possible. If a public half is given, only encryption is possible. hashAlgo : hash object The hash function to use. This can be a module under `Crypto.Hash` or an existing hash object created from any of such modules. If not specified, `Crypto.Hash.SHA1` is used. mgfunc : callable A mask generation function that accepts two parameters: a string to use as seed, and the lenth of the mask to generate, in bytes. If not specified, the standard MGF1 consistent with ``hashAlgo`` is used (a safe choice). label : bytes/bytearray/memoryview A label to apply to this particular encryption. If not specified, an empty string is used. Specifying a label does not improve security. randfunc : callable A function that returns random bytes. :attention: Modify the mask generation function only if you know what you are doing. Sender and receiver must use the same one. c0>[XTR5$)N)r_hashObj)xyselfs X/var/www/html/land-doc-ocr/venv/lib/python3.13/site-packages/Crypto/Cipher/PKCS1_OAEP.py+PKCS1OAEP_Cipher.__init__..IsT! %>N) _keyrCryptoHashSHA1_mgfr_label _randfunc)rkeyhashAlgomgfunclabelrandfuncs` r__init__PKCS1OAEP_Cipher.__init__&sO2 $DM"KK,,DM DI>DI!$e4 !rc6URR5$)zNLegacy function to check if you can call :meth:`encrypt`. .. deprecated:: 3.0)r can_encryptrs rr(PKCS1OAEP_Cipher.can_encryptNyy$$&&rc6URR5$)zNLegacy function to check if you can call :meth:`decrypt`. .. deprecated:: 3.0)r can_decryptr)s rr-PKCS1OAEP_Cipher.can_decryptTr+rc[RRRURR 5n[ US5nURRn[U5nX5- SU-- S- nUS:a [S5eURRUR5R5nSU-nXx-S-[SSU5-n URU5n UR!XU- S- 5n [#X5n UR!X5n [#X5nSU-U -n[%U5nURR'U5n[)UU5nU$) aEncrypt a message with PKCS#1 OAEP. :param message: The message to encrypt, also known as plaintext. It can be of variable length, but not longer than the RSA modulus (in bytes) minus 2, minus twice the hash output size. For instance, if you use RSA 2048 and SHA-256, the longest message you can encrypt is 190 byte long. :type message: bytes/bytearray/memoryview :returns: The ciphertext, as large as the RSA modulus. :rtype: bytes :raises ValueError: if the message is too long. rzPlaintext is too long.Nr )rUtilnumbersizernrr digest_sizelen ValueErrornewrdigestrrrrr_encryptr)rmessagemodBitskhLenmLenps_lenlHashpsdbrosdbMaskmaskedDBseedMask maskedSeedemem_intm_intcs rencryptPKCS1OAEP_Cipher.encryptZs=&++$$))$))++6 Wa }}((7|AH$q( A:56 6 !!$++.557 v  Z' !KdG$D DnnT"3$q)"%99X,C* z !H ,r" ""6* % #rc[RRRURR 5n[ US5nURRn[U5U:wdX4S-:a [S5e[U5nURRU5nURRUR5R5nUSUS-nXdS-Sn UR!X5n [#X5n UR!XU- S- 5n [#X5n [%XgU 5nUS::a [S5eXS$)aDecrypt a message with PKCS#1 OAEP. :param ciphertext: The encrypted message. :type ciphertext: bytes/bytearray/memoryview :returns: The original message (plaintext). :rtype: bytes :raises ValueError: if the ciphertext has the wrong length, or if decryption fails the integrity check (in which case, the decryption key is probably wrong). :raises TypeError: if the RSA key has no private half (i.e. you are trying to decrypt using a public key). r0r1z!Ciphertext with incorrect length.r NrzIncorrect decryption.)rr4r5r6rr7rrr8r9r:r_decrypt_to_bytesr;rr<rrr )r ciphertextr?r@rAct_intrLrDrKrIrJseedrHrFress rdecryptPKCS1OAEP_Cipher.decrypts &++$$))$))++6 Wa }}(( z?a 1Av:@A Az* YY ( ( 0 !!$++.557$q&\ 1fg;99X,j+44* H %"R( !845 5$xr)rrrrrN) __name__ __module__ __qualname____firstlineno____doc__r%r(r-rPrX__static_attributes__rrr r "s"8&"P' ' 4l1rr cBUc[Rn[XX#U5$)a>Return a cipher object :class:`PKCS1OAEP_Cipher` that can be used to perform PKCS#1 OAEP encryption or decryption. :param key: The key object to use to encrypt or decrypt the message. Decryption is only possible with a private RSA key. :type key: RSA key object :param hashAlgo: The hash function to use. This can be a module under `Crypto.Hash` or an existing hash object created from any of such modules. If not specified, `Crypto.Hash.SHA1` is used. :type hashAlgo: hash object :param mgfunc: A mask generation function that accepts two parameters: a string to use as seed, and the lenth of the mask to generate, in bytes. If not specified, the standard MGF1 consistent with ``hashAlgo`` is used (a safe choice). :type mgfunc: callable :param label: A label to apply to this particular encryption. If not specified, an empty string is used. Specifying a label does not improve security. :type label: bytes/bytearray/memoryview :param randfunc: A function that returns random bytes. The default is `Random.get_random_bytes`. :type randfunc: callable )r get_random_bytesr )r r!r"r#r$s rr;r;s%B** C6( CCr)NNrN)Crypto.Signature.pssrCrypto.Hash.SHA1rCrypto.Util.py3compatrCrypto.Util.numberrrrCrypto.Util.strxorrr _pkcs1_oaep_decoder r r;r`rrris5.&-EE%+__D#Dr