9i'|SrS/rSSKJr SSKJrJrJrJrJ r J r J r J r SSK Jr \"SS5r"SS\5rS rg ) z Output Feedback (CFB) mode. OfbMode) _copy_bytes)load_pycryptodome_raw_lib VoidPointercreate_string_bufferget_raw_buffer SmartPointerc_size_t c_uint8_ptris_writeable_buffer)get_random_byteszCrypto.Cipher._raw_ofba int OFB_start_operation(void *cipher, const uint8_t iv[], size_t iv_len, void **pResult); int OFB_encrypt(void *ofbState, const uint8_t *in, uint8_t *out, size_t data_len); int OFB_decrypt(void *ofbState, const uint8_t *in, uint8_t *out, size_t data_len); int OFB_stop_operation(void *state); c2\rSrSrSrSrSSjrSSjrSrg) r7a*Output FeedBack (OFB)*. This mode is very similar to CBC, but it transforms the underlying block cipher into a stream cipher. The keystream is the iterated block encryption of the previous ciphertext block. An Initialization Vector (*IV*) is required. See `NIST SP800-38A`_ , Section 6.4. .. _`NIST SP800-38A` : http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf :undocumented: __init__ c  [5Ul[RUR 5[ U5[ [U55URR55nU(a[SU-5e[URR 5[R5UlUR5 [U5Ul [SSU5UlURUlSS/Ulg)aCreate a new block cipher, configured in OFB mode. :Parameters: block_cipher : C pointer A smart pointer to the low-level block cipher instance. iv : bytes/bytearray/memoryview The initialization vector to use for encryption or decryption. It is as long as the cipher block. **The IV must be a nonce, to to be reused for any other message**. It shall be a nonce or a random value. Reusing the *IV* for encryptions performed with the same key compromises confidentiality. z)Error %d while instantiating the OFB modeNencryptdecrypt)r_state raw_ofb_libOFB_start_operationgetr r len address_of ValueErrorr OFB_stop_operationrelease block_sizerivIV_next)self block_cipherrresults W/var/www/html/land-doc-ocr/venv/lib/python3.13/site-packages/Crypto/Cipher/_mode_ofb.py__init__OfbMode.__init__Is$"m 001A1A1C1>> c.encrypt(a) + c.encrypt(b) is equivalent to: >>> c.encrypt(a+b) This function does not add any padding to the plaintext. :Parameters: plaintext : bytes/bytearray/memoryview The piece of data to encrypt. It can be of any length. :Keywords: output : bytearray/memoryview The location where the ciphertext must be written to. If ``None``, the ciphertext is returned. :Return: If ``output`` is ``None``, the ciphertext is returned as ``bytes``. Otherwise, ``None``. rz*encrypt() cannot be called after decrypt()N4output must be a bytearray or a writeable memoryview9output must have the same length as the input (%d bytes)z%Error %d while encrypting in OFB mode) r TypeErrorrrr rr OFB_encryptrrr r r)r plaintextoutput ciphertextr"s r#rOfbMode.encryptysB DJJ &HI I[ >-c)n=JJ&v.. VWW9~V, "025i."ABB(():)4Y)?)4Z)@)1#i.)AC DvMN N >!*- -r&c SUR;a [S5eS/UlUc[[U55nOLUn[ U5(d [S5e[U5[U5:wa[ S[U5-5e[ RURR5[U5[U5[[U555nU(a[ SU-5eUc [U5$g)aBDecrypt data with the key and the parameters set at initialization. A cipher object is stateful: once you have decrypted a message you cannot decrypt (or encrypt) another message with the same object. The data to decrypt can be broken up in two or more pieces and `decrypt` can be called multiple times. That is, the statement: >>> c.decrypt(a) + c.decrypt(b) is equivalent to: >>> c.decrypt(a+b) This function does not remove any padding from the plaintext. :Parameters: ciphertext : bytes/bytearray/memoryview The piece of data to decrypt. It can be of any length. :Keywords: output : bytearray/memoryview The location where the plaintext is written to. If ``None``, the plaintext is returned. :Return: If ``output`` is ``None``, the plaintext is returned as ``bytes``. Otherwise, ``None``. rz*decrypt() cannot be called after encrypt()Nr(r)z%Error %d while decrypting in OFB mode) rr*rrr rr OFB_decryptrrr r r)r r.r-r,r"s r#rOfbMode.decryptsB DJJ &HI I[ >,S_=II&v.. VWW:#f+- "025i."ABB(():)4Z)@)4Y)?)1#j/)BD DvMN N >!), ,r&)rrrrr)N) __name__ __module__ __qualname____firstlineno____doc__r$rr__static_attributes__r&r#rr7s".,`;z;r&c URU5nURSS5nURSS5nSX44:Xa[UR5nUbUb [ S5eOUn[ U5UR:wa[ SUR-5eU(a[ S[U5-5e[X#5$)aInstantiate a cipher object that performs OFB encryption/decryption. :Parameters: factory : module The underlying block cipher, a module from ``Crypto.Cipher``. :Keywords: iv : bytes/bytearray/memoryview The IV to use for OFB. IV : bytes/bytearray/memoryview Alias for ``iv``. Any other keyword will be passed to the underlying block cipher. See the relevant documentation for details (at least ``key`` will need to be present). rNr)NNz*You must either use 'iv' or 'IV', not bothz.Incorrect IV length (it must be %d bytes long)zUnknown parameters for OFB: %s) _create_base_cipherpopr rr*rrstrr)factorykwargs cipher_staterrs r#_create_ofb_cipherrAs&..v6L D$ B D$ Bx g00 1 ~ >HI I  2w'$$$I""#$ $83v;FGG < $$r&N)r7__all__Crypto.Util.py3compatrCrypto.Util._raw_apirrrrr r r r Crypto.Randomr robjectrrAr9r&r#rGsQ. +-777 +'(@C* $zfzz&%r&