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remove bitwise_xor fixes #158

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Z. Cliffe Schreuders
2024-06-26 13:19:11 +01:00
parent f8e97cd1a4
commit bc24abfb6f
4 changed files with 0 additions and 93 deletions
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modules/encoders/cipher/bitwise_xor/bitwise_xor.pp
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modules/encoders/cipher/bitwise_xor/manifests/.no_puppet
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modules/encoders/cipher/bitwise_xor/secgen_local/local.rb
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#!/usr/bin/ruby
# Inputs: An ASCII string to mask
# Outputs: 2 bit stream strings which, when XOR'd together, result in the input string.
# Description: Input string is converted into a bit stream (String A)
# Random equivalent length bit stream is generated (String B)
# Strings A and B are XOR'd together to give us a third (String C)
# Strings B and C are returned.
require_relative '../../../../../lib/objects/local_string_encoder.rb'
class BitwiseXORChallengeGenerator < StringEncoder
def initialize
super
self.module_name = 'Bitwise XOR Challenge Generator'
end
def encode(str)
number_of_bytes = str.length
# String A: Convert input that we're hiding into binary
binary_string_to_mask = str.unpack('B*')[0]
# String B: Generate bitstream
generated_bit_stream = []
number_of_bytes.times do
generated_bit_stream << (1..8).map { [0, 1].sample }.join
end
generated_bit_stream = generated_bit_stream.join
# bitwise xor
decimal_result = binary_string_to_mask.to_i(2) ^ generated_bit_stream.to_i(2)
# Turn decimal result back into a string of bits
binary_string_c = decimal_result.to_s(2)
# prepend leading 0's to the result
result = binary_string_c.to_s.rjust(number_of_bytes * 8, '0')
# join the binary strings with an underscore
self.outputs << "#{generated_bit_stream}_#{result}"
end
end
BitwiseXORChallengeGenerator.new.run

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modules/encoders/cipher/bitwise_xor/secgen_metadata.xml
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<?xml version="1.0"?>
<encoder xmlns="http://www.github/cliffe/SecGen/encoder"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.github/cliffe/SecGen/encoder">
<name>Bitwise XOR Challenge encoder</name>
<author>Thomas Shaw</author>
<module_license>MIT</module_license>
<description>Binary bitwise XOR operation module. Takes a string input, generates a random bitstream of equal length.,
XOR's the 2 strings, outputs the binary streams joined with an underscore.
</description>
<type>ctf_challenge</type>
<type>ascii_reversible</type>
<type>string_encoder</type>
<type>local_calculation</type>
<platform>linux</platform>
<platform>windows</platform>
<difficulty>high</difficulty>
<hint>Perform a bitwise XOR on both strings - https://www.youtube.com/watch?v=YtghBxoBxpA</hint>
<solution>Example bitwise XOR tool:
http://www.mobilefish.com/services/big_number_bitwise_calculation/big_number_bitwise_calculation.php
Decode the result into it's ASCII representation.
</solution>
<read_fact>strings_to_encode</read_fact>
<default_input into="strings_to_encode">
<generator type="flag_generator"/>
</default_input>
<output_type>generated_strings</output_type>
<!-- TODO FIXME: Issue #158: Stack level too deep -->
<!-- In the meantime conflicts with everything to avoid being selected -->
<conflict>
<module_path>.*</module_path>
</conflict>
<CyBOK KA="F" topic="Artifact Analysis">
<keyword>Encoding and alternative data formats</keyword>
</CyBOK>
<CyBOK KA="C" topic="Symmetric Cryptography">
<keyword>symmetric encryption and authentication</keyword>
</CyBOK>
</encoder>