o Bd\R41@spdZddlZejddkrejddkrddlTddlTdZdZdZdZdZ d Z d Z dd d Z Gd ddZ dS)z4Module with definitions common to all block ciphers.N)*cCs6||}t||kr|rtd|||}|p|S)zFFind a parameter in tuple and dictionary arguments a function receivesz!Parameter '%s' is specified twice)getlen ValueError)nameindexargskwargsdefaultparamrI/var/www/html/env/lib/python3.10/site-packages/Crypto/Cipher/blockalgo.py _getParameter|s   rc@s(eZdZdZddZddZddZdS) BlockAlgoz)Class modelling an abstract block cipher.cOstdd||td|_|j|_|jtkr'|j|g|Ri||_|jj|_dSd|_d|_ tdd|||_|js>> c.encrypt(a) + c.encrypt(b) is always equivalent to: >>> c.encrypt(a+b) That also means that you cannot reuse an object for encrypting or decrypting other data with the same key. This function does not perform any padding. - For `MODE_ECB`, `MODE_CBC`, and `MODE_OFB`, *plaintext* length (in bytes) must be a multiple of *block_size*. - For `MODE_CFB`, *plaintext* length (in bytes) must be a multiple of *segment_size*/8. - For `MODE_CTR`, *plaintext* can be of any length. - For `MODE_OPENPGP`, *plaintext* must be a multiple of *block_size*, unless it is the last chunk of the message. :Parameters: plaintext : byte string The piece of data to encrypt. :Return: the encrypted data, as a byte string. It is as long as *plaintext* with one exception: when encrypting the first message chunk with `MODE_OPENPGP`, the encypted IV is prepended to the returned ciphertext. rFOnly the last chunk is allowed to have length not multiple of %d bytesTrN) rr rr r%r r'r"r(r$r))r+ plaintextpadding_lengthpaddedresrrrr(s '   zBlockAlgo.encryptcCs|jtkr@|jt||j|j}|dkr8|jrtd|jd|_|td|}|j|dt|}|S|j|}|S|j|S)aDecrypt data with the key and the parameters set at initialization. The cipher object is stateful; decryption of a long block of data can be broken up in two or more calls to `decrypt()`. That is, the statement: >>> c.decrypt(a) + c.decrypt(b) is always equivalent to: >>> c.decrypt(a+b) That also means that you cannot reuse an object for encrypting or decrypting other data with the same key. This function does not perform any padding. - For `MODE_ECB`, `MODE_CBC`, and `MODE_OFB`, *ciphertext* length (in bytes) must be a multiple of *block_size*. - For `MODE_CFB`, *ciphertext* length (in bytes) must be a multiple of *segment_size*/8. - For `MODE_CTR`, *ciphertext* can be of any length. - For `MODE_OPENPGP`, *plaintext* must be a multiple of *block_size*, unless it is the last chunk of the message. :Parameters: ciphertext : byte string The piece of data to decrypt. :Return: the decrypted data (byte string, as long as *ciphertext*). rr0TrN) rr rr r%r r'r"r*)r+ ciphertextr2r3r4rrrr*s "  zBlockAlgo.decryptN)__name__ __module__ __qualname____doc__r/r(r*rrrrrs 3 ;r)N)r9sys version_infoCrypto.Util.py21compatCrypto.Util.py3compatrMODE_CBCr&MODE_PGPMODE_OFBMODE_CTRr rrrrrrs