From 20dbeb2f38684c65ff0a4b99012c161295708e88 Mon Sep 17 00:00:00 2001 From: AL-LCL Date: Fri, 19 May 2023 11:01:49 +0200 Subject: NeoRAT --- .../lazagne/config/crypto/pyaes/blockfeeder.py | 227 +++++++++++++++++++++ 1 file changed, 227 insertions(+) create mode 100644 foreign/client_handling/lazagne/config/crypto/pyaes/blockfeeder.py (limited to 'foreign/client_handling/lazagne/config/crypto/pyaes/blockfeeder.py') diff --git a/foreign/client_handling/lazagne/config/crypto/pyaes/blockfeeder.py b/foreign/client_handling/lazagne/config/crypto/pyaes/blockfeeder.py new file mode 100644 index 0000000..b9a904d --- /dev/null +++ b/foreign/client_handling/lazagne/config/crypto/pyaes/blockfeeder.py @@ -0,0 +1,227 @@ +# The MIT License (MIT) +# +# Copyright (c) 2014 Richard Moore +# +# Permission is hereby granted, free of charge, to any person obtaining a copy +# of this software and associated documentation files (the "Software"), to deal +# in the Software without restriction, including without limitation the rights +# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +# copies of the Software, and to permit persons to whom the Software is +# furnished to do so, subject to the following conditions: +# +# The above copyright notice and this permission notice shall be included in +# all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +# THE SOFTWARE. + + +from .aes import AESBlockModeOfOperation, AESSegmentModeOfOperation, AESStreamModeOfOperation +from .util import append_PKCS7_padding, strip_PKCS7_padding, to_bufferable + + +# First we inject three functions to each of the modes of operations +# +# _can_consume(size) +# - Given a size, determine how many bytes could be consumed in +# a single call to either the decrypt or encrypt method +# +# _final_encrypt(data, padding = PADDING_DEFAULT) +# - call and return encrypt on this (last) chunk of data, +# padding as necessary; this will always be at least 16 +# bytes unless the total incoming input was less than 16 +# bytes +# +# _final_decrypt(data, padding = PADDING_DEFAULT) +# - same as _final_encrypt except for decrypt, for +# stripping off padding +# + +PADDING_NONE = 'none' +PADDING_DEFAULT = 'default' + +# @TODO: Ciphertext stealing and explicit PKCS#7 +# PADDING_CIPHERTEXT_STEALING +# PADDING_PKCS7 + +# ECB and CBC are block-only ciphers + +def _block_can_consume(self, size): + if size >= 16: return 16 + return 0 + +# After padding, we may have more than one block +def _block_final_encrypt(self, data, padding = PADDING_DEFAULT): + if padding == PADDING_DEFAULT: + data = append_PKCS7_padding(data) + + elif padding == PADDING_NONE: + if len(data) != 16: + raise Exception('invalid data length for final block') + else: + raise Exception('invalid padding option') + + if len(data) == 32: + return self.encrypt(data[:16]) + self.encrypt(data[16:]) + + return self.encrypt(data) + + +def _block_final_decrypt(self, data, padding = PADDING_DEFAULT): + if padding == PADDING_DEFAULT: + return strip_PKCS7_padding(self.decrypt(data)) + + if padding == PADDING_NONE: + if len(data) != 16: + raise Exception('invalid data length for final block') + return self.decrypt(data) + + raise Exception('invalid padding option') + +AESBlockModeOfOperation._can_consume = _block_can_consume +AESBlockModeOfOperation._final_encrypt = _block_final_encrypt +AESBlockModeOfOperation._final_decrypt = _block_final_decrypt + + + +# CFB is a segment cipher + +def _segment_can_consume(self, size): + return self.segment_bytes * int(size // self.segment_bytes) + +# CFB can handle a non-segment-sized block at the end using the remaining cipherblock +def _segment_final_encrypt(self, data, padding = PADDING_DEFAULT): + if padding != PADDING_DEFAULT: + raise Exception('invalid padding option') + + faux_padding = (chr(0) * (self.segment_bytes - (len(data) % self.segment_bytes))) + padded = data + to_bufferable(faux_padding) + return self.encrypt(padded)[:len(data)] + +# CFB can handle a non-segment-sized block at the end using the remaining cipherblock +def _segment_final_decrypt(self, data, padding = PADDING_DEFAULT): + if padding != PADDING_DEFAULT: + raise Exception('invalid padding option') + + faux_padding = (chr(0) * (self.segment_bytes - (len(data) % self.segment_bytes))) + padded = data + to_bufferable(faux_padding) + return self.decrypt(padded)[:len(data)] + +AESSegmentModeOfOperation._can_consume = _segment_can_consume +AESSegmentModeOfOperation._final_encrypt = _segment_final_encrypt +AESSegmentModeOfOperation._final_decrypt = _segment_final_decrypt + + + +# OFB and CTR are stream ciphers + +def _stream_can_consume(self, size): + return size + +def _stream_final_encrypt(self, data, padding = PADDING_DEFAULT): + if padding not in [PADDING_NONE, PADDING_DEFAULT]: + raise Exception('invalid padding option') + + return self.encrypt(data) + +def _stream_final_decrypt(self, data, padding = PADDING_DEFAULT): + if padding not in [PADDING_NONE, PADDING_DEFAULT]: + raise Exception('invalid padding option') + + return self.decrypt(data) + +AESStreamModeOfOperation._can_consume = _stream_can_consume +AESStreamModeOfOperation._final_encrypt = _stream_final_encrypt +AESStreamModeOfOperation._final_decrypt = _stream_final_decrypt + + + +class BlockFeeder(object): + '''The super-class for objects to handle chunking a stream of bytes + into the appropriate block size for the underlying mode of operation + and applying (or stripping) padding, as necessary.''' + + def __init__(self, mode, feed, final, padding = PADDING_DEFAULT): + self._mode = mode + self._feed = feed + self._final = final + self._buffer = to_bufferable("") + self._padding = padding + + def feed(self, data = None): + '''Provide bytes to encrypt (or decrypt), returning any bytes + possible from this or any previous calls to feed. + + Call with None or an empty string to flush the mode of + operation and return any final bytes; no further calls to + feed may be made.''' + + if self._buffer is None: + raise ValueError('already finished feeder') + + # Finalize; process the spare bytes we were keeping + if data is None: + result = self._final(self._buffer, self._padding) + self._buffer = None + return result + + self._buffer += to_bufferable(data) + + # We keep 16 bytes around so we can determine padding + result = to_bufferable('') + while len(self._buffer) > 16: + can_consume = self._mode._can_consume(len(self._buffer) - 16) + if can_consume == 0: break + result += self._feed(self._buffer[:can_consume]) + self._buffer = self._buffer[can_consume:] + + return result + + +class Encrypter(BlockFeeder): + 'Accepts bytes of plaintext and returns encrypted ciphertext.' + + def __init__(self, mode, padding = PADDING_DEFAULT): + BlockFeeder.__init__(self, mode, mode.encrypt, mode._final_encrypt, padding) + + +class Decrypter(BlockFeeder): + 'Accepts bytes of ciphertext and returns decrypted plaintext.' + + def __init__(self, mode, padding = PADDING_DEFAULT): + BlockFeeder.__init__(self, mode, mode.decrypt, mode._final_decrypt, padding) + + +# 8kb blocks +BLOCK_SIZE = (1 << 13) + +def _feed_stream(feeder, in_stream, out_stream, block_size = BLOCK_SIZE): + 'Uses feeder to read and convert from in_stream and write to out_stream.' + + while True: + chunk = in_stream.read(block_size) + if not chunk: + break + converted = feeder.feed(chunk) + out_stream.write(converted) + converted = feeder.feed() + out_stream.write(converted) + + +def encrypt_stream(mode, in_stream, out_stream, block_size = BLOCK_SIZE, padding = PADDING_DEFAULT): + 'Encrypts a stream of bytes from in_stream to out_stream using mode.' + + encrypter = Encrypter(mode, padding = padding) + _feed_stream(encrypter, in_stream, out_stream, block_size) + + +def decrypt_stream(mode, in_stream, out_stream, block_size = BLOCK_SIZE, padding = PADDING_DEFAULT): + 'Decrypts a stream of bytes from in_stream to out_stream using mode.' + + decrypter = Decrypter(mode, padding = padding) + _feed_stream(decrypter, in_stream, out_stream, block_size) -- cgit v1.2.3