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Renamed a class and added examples to readme

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Leonetienne 2021-12-06 03:30:02 +01:00
parent 183646179a
commit 8fd5a1f20c
7 changed files with 37 additions and 932 deletions
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2
ExampleApp/main.cpp
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#pragma once
#include <iostream>
#include <GhettoCipherWrapper.h>
#include <GhettoCryptWrapper.h>
using namespace GhettoCipher;

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GhettoCrypt/GhettoCipherWrapper.cpp → GhettoCrypt/GhettoCryptWrapper.cpp
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#include "GhettoCipherWrapper.h"
#include "GhettoCryptWrapper.h"
#include "Cipher.h"
#include "Util.h"

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GhettoCrypt/GhettoCipherWrapper.h → GhettoCrypt/GhettoCryptWrapper.h
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453
INCLUDE/GhettoCipher.cpp
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/*
* BSD 2-Clause License
*
* Copyright (c) 2021, Leon Etienne
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "GhettoCipher.h"
/*** ./../GhettoCrypt/Cipher.cpp ***/
#include <iostream>
GhettoCipher::Cipher::Cipher(const Block& key)
:
key { key }
{
return;
}
GhettoCipher::Cipher::Cipher(const std::string& password)
{
key = PasswordToKey(password);
return;
}
GhettoCipher::Cipher::~Cipher()
{
// Clear key memory
ZeroKeyMemory();
return;
}
void GhettoCipher::Cipher::SetKey(const Block& key)
{
ZeroKeyMemory();
this->key = key;
return;
}
void GhettoCipher::Cipher::SetPassword(const std::string& password)
{
ZeroKeyMemory();
key = PasswordToKey(password);
return;
}
GhettoCipher::Flexblock GhettoCipher::Cipher::Encipher(const Flexblock& data, bool printProgress) const
{
// Split cleartext into blocks
std::vector<Block> blocks;
for (std::size_t i = 0; i < data.size(); i += BLOCK_SIZE)
blocks.push_back(Block(
PadStringToLength(data.substr(i, BLOCK_SIZE), BLOCK_SIZE, '0', false))
);
// Encrypt individual blocks using cipher block chaining
Feistel feistel(key);
for (std::size_t i = 0; i < blocks.size(); i++)
{
// Print reports if desired. If we have > 1000 blocks, print one report every 100 blocks. Otherwise for every 10th block.
if ((i % ((blocks.size() > 1000)? 100 : 10) == 0) && (printProgress))
std::cout << "Encrypting... (Block " << i << " / " << blocks.size() << " - " << ((float)i*100 / blocks.size()) << "%)" << std::endl;
const Block& lastBlock = (i>0) ? blocks[i-1] : emptyBlock;
blocks[i] = feistel.Encipher(blocks[i] ^ lastBlock);
}
// Concatenate ciphertext blocks back into a flexblock
std::stringstream ss;
for (Block& b : blocks)
ss << b;
// Return it
return ss.str();
}
GhettoCipher::Flexblock GhettoCipher::Cipher::Decipher(const Flexblock& data, bool printProgress) const
{
// Split ciphertext into blocks
std::vector<Block> blocks;
for (std::size_t i = 0; i < data.size(); i += BLOCK_SIZE)
blocks.push_back(Block(
PadStringToLength(data.substr(i, BLOCK_SIZE), BLOCK_SIZE, '0', false))
);
// Decrypt individual blocks
Feistel feistel(key);
// We can't do this in-loop for decryption, because we are decrypting the blocks in-place.
Block lastBlock = emptyBlock;
for (std::size_t i = 0; i < blocks.size(); i++)
{
// Print reports if desired. If we have > 1000 blocks, print one report every 100 blocks. Otherwise for every 10th block.
if ((i % ((blocks.size() > 1000) ? 100 : 10) == 0) && (printProgress))
std::cout << "Decrypting... (Block " << i << " / " << blocks.size() << " - " << ((float)i*100/ blocks.size()) << "%)" << std::endl;
Block tmpCopy = blocks[i];
blocks[i] = feistel.Decipher(blocks[i]) ^ lastBlock;
lastBlock = std::move(tmpCopy);
}
// Concatenate ciphertext blocks back into a flexblock
std::stringstream ss;
for (Block& b : blocks)
ss << b;
// Return it
return ss.str();
}
#if defined _WIN32 || defined _WIN64
#pragma optimize("", off )
#endif
void GhettoCipher::Cipher::ZeroKeyMemory()
{
key.reset();
return;
}
#if defined _WIN32 || defined _WIN64
#pragma optimize("", on )
#endif
const GhettoCipher::Block GhettoCipher::Cipher::emptyBlock;
/*** ./../GhettoCrypt/Feistel.cpp ***/
GhettoCipher::Feistel::Feistel(const Block& key)
{
SetKey(key);
return;
}
GhettoCipher::Feistel::~Feistel()
{
ZeroKeyMemory();
return;
}
void GhettoCipher::Feistel::SetKey(const Block& key)
{
GenerateRoundKeys(key);
return;
}
GhettoCipher::Block GhettoCipher::Feistel::Encipher(const Block& data) const
{
return Run(data, false);
}
GhettoCipher::Block GhettoCipher::Feistel::Decipher(const Block& data) const
{
return Run(data, true);
}
GhettoCipher::Block GhettoCipher::Feistel::Run(const Block& data, bool reverseKeys) const
{
const auto splitData = FeistelSplit(data);
GhettoCipher::Halfblock l = splitData.first;
GhettoCipher::Halfblock r = splitData.second;
Halfblock tmp;
for (std::size_t i = 0; i < N_ROUNDS; i++)
{
// Calculate key index
std::size_t keyIndex;
if (reverseKeys)
keyIndex = N_ROUNDS - i - 1;
else
keyIndex = i;
// Do a feistel round
tmp = r;
r = l ^ F(r, roundKeys[keyIndex]);
l = tmp;
}
return FeistelCombine(r, l);
}
GhettoCipher::Halfblock GhettoCipher::Feistel::F(Halfblock m, const Block& key)
{
// Made-up F function
// Expand to full bitwidth
Block m_expanded = ExpansionFunction(m);
// Shift to left by 1
m_expanded = Shiftl(m_expanded, 1);
// Xor with key
m_expanded ^= key;
// Non-linearly apply subsitution boxes
std::stringstream ss;
const std::string m_str = m_expanded.to_string();
for (std::size_t i = 0; i < m_str.size(); i += 4)
{
ss << SBox(m_str.substr(i, 4));
}
m_expanded = Block(ss.str());
// Return the compressed version
return CompressionFunction(m_expanded);
}
std::pair<GhettoCipher::Halfblock, GhettoCipher::Halfblock> GhettoCipher::Feistel::FeistelSplit(const Block& block)
{
const std::string bits = block.to_string();
Halfblock l(bits.substr(0, bits.size() / 2));
Halfblock r(bits.substr(bits.size() / 2));
return std::make_pair(l, r);
}
GhettoCipher::Block GhettoCipher::Feistel::FeistelCombine(const Halfblock& l, const Halfblock& r)
{
return Block(l.to_string() + r.to_string());
}
GhettoCipher::Block GhettoCipher::Feistel::ExpansionFunction(const Halfblock& block)
{
std::stringstream ss;
const std::string bits = block.to_string();
// We have to double the bits!
for (std::size_t i = 0; i < bits.size(); i += 2)
{
const std::string sub = bits.substr(i, 2);
if (sub == "00") ss << "1101";
else if (sub == "01") ss << "1000";
else if (sub == "10") ss << "0010";
else if (sub == "11") ss << "0111";
}
return Block(ss.str());
}
GhettoCipher::Halfblock GhettoCipher::Feistel::CompressionFunction(const Block& block)
{
std::stringstream ss;
const std::string bits = block.to_string();
// We have to double the bits!
for (std::size_t i = 0; i < bits.size(); i += 4)
{
const std::string sub = bits.substr(i, 4);
if (sub == "0000") ss << "10";
else if (sub == "0001") ss << "01";
else if (sub == "0010") ss << "10";
else if (sub == "0011") ss << "10";
else if (sub == "0100") ss << "11";
else if (sub == "0101") ss << "01";
else if (sub == "0110") ss << "00";
else if (sub == "0111") ss << "11";
else if (sub == "1000") ss << "01";
else if (sub == "1001") ss << "00";
else if (sub == "1010") ss << "11";
else if (sub == "1011") ss << "00";
else if (sub == "1100") ss << "11";
else if (sub == "1101") ss << "10";
else if (sub == "1110") ss << "00";
else if (sub == "1111") ss << "01";
}
return Halfblock(ss.str());
}
std::string GhettoCipher::Feistel::SBox(const std::string& in)
{
if (in == "0000") return "1100";
else if (in == "0001") return "1000";
else if (in == "0010") return "0001";
else if (in == "0011") return "0111";
else if (in == "0100") return "1011";
else if (in == "0101") return "0011";
else if (in == "0110") return "1101";
else if (in == "0111") return "1111";
else if (in == "1000") return "0000";
else if (in == "1001") return "1010";
else if (in == "1010") return "0100";
else if (in == "1011") return "1001";
else if (in == "1100") return "0010";
else if (in == "1101") return "1110";
else if (in == "1110") return "0101";
else /*if (in == "1111")*/ return "0110";
}
void GhettoCipher::Feistel::GenerateRoundKeys(const Block& seedKey)
{
// Generate round keys via output feedback modus (OFM) method
// Clear initial key memory
ZeroKeyMemory();
roundKeys = Keyset();
// Generate new keys from the seed key
roundKeys[0] = seedKey;
roundKeys[1] = (Shiftl(seedKey, 32) ^ roundKeys[0]);
for (std::size_t i = 2; i < roundKeys.size(); i++)
{
roundKeys[i] = Shiftl(roundKeys[i - 1], i + 32) ^ roundKeys[i - 2];
}
return;
}
// These pragmas only work for MSVC, as far as i know. Beware!!!
#if defined _WIN32 || defined _WIN64
#pragma optimize("", off )
#endif
void GhettoCipher::Feistel::ZeroKeyMemory()
{
for (Block& key : roundKeys)
key.reset();
return;
}
#if defined _WIN32 || defined _WIN64
#pragma optimize("", on )
#endif
/*** ./../GhettoCrypt/GhettoCipherWrapper.cpp ***/
std::string GhettoCipher::GhettoCryptWrapper::EncryptString(const std::string& cleartext, const std::string& password)
{
// Instanciate our cipher and supply a key
Cipher cipher(password);
// Recode the ascii-string to bits
const Flexblock cleartext_bits = StringToBits(cleartext);
// Encrypt our cleartext bits
const Flexblock ciphertext_bits = cipher.Encipher(cleartext_bits);
// Recode the ciphertext bits to a hex-string
const std::string ciphertext = BitsToHexstring(ciphertext_bits);
// Return it
return ciphertext;
}
std::string GhettoCipher::GhettoCryptWrapper::DecryptString(const std::string& ciphertext, const std::string& password)
{
// Instanciate our cipher and supply a key
Cipher cipher(password);
// Recode the hex-string to bits
const Flexblock ciphertext_bits = HexstringToBits(ciphertext);
// Decrypt the ciphertext bits
const std::string cleartext_bits = cipher.Decipher(ciphertext_bits);
// Recode the cleartext bits to an ascii-string
const std::string cleartext = BitsToString(cleartext_bits);
// Return it
return cleartext;
}
bool GhettoCipher::GhettoCryptWrapper::EncryptFile(const std::string& filename_in, const std::string& filename_out, const std::string& password)
{
try
{
// Read the file to bits
const Flexblock cleartext_bits = ReadFileToBits(filename_in);
// Instanciate our cipher and supply a key
Cipher cipher(password);
// Encrypt our cleartext bits
const Flexblock ciphertext_bits = cipher.Encipher(cleartext_bits);
// Write our ciphertext bits to file
WriteBitsToFile(filename_out, ciphertext_bits);
return true;
}
catch (std::runtime_error&)
{
return false;
}
}
bool GhettoCipher::GhettoCryptWrapper::DecryptFile(const std::string& filename_in, const std::string& filename_out, const std::string& password)
{
try
{
// Read the file to bits
const Flexblock ciphertext_bits = ReadFileToBits(filename_in);
// Instanciate our cipher and supply a key
Cipher cipher(password);
// Decrypt the ciphertext bits
const Flexblock cleartext_bits = cipher.Decipher(ciphertext_bits);
// Write our cleartext bits to file
WriteBitsToFile(filename_out, cleartext_bits);
return true;
}
catch (std::runtime_error&)
{
return false;
}
}

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INCLUDE/GhettoCipher.h
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/*
* BSD 2-Clause License
*
* Copyright (c) 2021, Leon Etienne
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
/*** ./../GhettoCrypt/GhettoCipherWrapper.h ***/
#pragma once
#include <string>
namespace GhettoCipher
{
/** This class is a wrapper to make working with the GhettoCipher super easy with a python-like syntax
*/
class GhettoCryptWrapper
{
public:
//! Will encrypt a string and return it hexadecimally encoded.
static std::string EncryptString(const std::string& cleartext, const std::string& password);
//! Will decrypt a hexadecimally encoded string.
static std::string DecryptString(const std::string& ciphertext, const std::string& password);
//! Will encrypt a file.
//! Returns false if anything goes wrong (like, file-access).
//! @filename_in The file to be read.
//! @filename_out The file the encrypted version should be saved in.
static bool EncryptFile(const std::string& filename_in, const std::string& filename_out, const std::string& password);
//! Will decrypt a file.
//! Returns false if anything goes wrong (like, file-access).
//! @filename_in The file to be read.
//! @filename_out The file the decrypted version should be saved in.
static bool DecryptFile(const std::string& filename_in, const std::string& filename_out, const std::string& password);
private:
// No instanciation! >:(
GhettoCryptWrapper();
};
}
/*** ./../GhettoCrypt/Flexblock.h ***/
#pragma once
#include <vector>
namespace GhettoCipher
{
//! A "bitset" of variable length
typedef std::string Flexblock;
}
/*** ./../GhettoCrypt/Config.h ***/
#pragma once
namespace GhettoCipher
{
constexpr int BLOCK_SIZE = 128;
constexpr int N_ROUNDS = 64;
}
/*** ./../GhettoCrypt/Halfblock.h ***/
#pragma once
#include <bitset>
namespace GhettoCipher
{
constexpr int HALFBLOCK_SIZE = (BLOCK_SIZE / 2);
typedef std::bitset<HALFBLOCK_SIZE> Halfblock;
}
/*** ./../GhettoCrypt/Block.h ***/
#pragma once
#include <bitset>
namespace GhettoCipher
{
typedef std::bitset<BLOCK_SIZE> Block;
}
/*** ./../GhettoCrypt/Util.h ***/
#pragma once
#include <bitset>
#include <sstream>
#include <fstream>
namespace GhettoCipher
{
//! Mod-operator that works with negative values
inline int Mod(int numerator, int denominator)
{
return (denominator + (numerator % denominator)) % denominator;
}
//! Will perform a wrapping left-bitshift on a bitset
template <std::size_t T>
inline std::bitset<T> Shiftl(const std::bitset<T>& bits, std::size_t amount)
{
std::stringstream ss;
const std::string bitss = bits.to_string();
for (std::size_t i = 0; i < bitss.size(); i++)
ss << bitss[Mod((i + amount), bitss.size())];
return std::bitset<T>(ss.str());
}
//! Will perform a wrapping right-bitshift on a bitset
template <std::size_t T>
inline std::bitset<T> Shiftr(const std::bitset<T>& bits, std::size_t amount)
{
std::stringstream ss;
const std::string bitss = bits.to_string();
for (std::size_t i = 0; i < bitss.size(); i++)
ss << bitss[Mod((i - amount), bitss.size())];
return std::bitset<T>(ss.str());
}
inline std::string PadStringToLength(const std::string& str, const std::size_t len, const char pad, const bool padLeft = true)
{
// Fast-reject: Already above padded length
if (str.length() >= len)
return str;
std::stringstream ss;
// Pad left:
if (padLeft)
{
for (std::size_t i = 0; i < len - str.size(); i++)
ss << pad;
ss << str;
}
// Pad right:
else
{
ss << str;
for (std::size_t i = 0; i < len - str.size(); i++)
ss << pad;
}
return ss.str();
}
//! Will convert a string to a fixed data block
inline Block StringToBitblock(const std::string& s)
{
std::stringstream ss;
for (std::size_t i = 0; i < s.size(); i++)
ss << std::bitset<8>(s[i]);
// Pad rest with zeores
return Block(PadStringToLength(ss.str(), 128, '0', false));
}
//! Will convert a string to a flexible data block
inline Flexblock StringToBits(const std::string& s)
{
std::stringstream ss;
for (std::size_t i = 0; i < s.size(); i++)
ss << std::bitset<8>(s[i]);
return Flexblock(ss.str());
}
//! Will convert a fixed data block to a string
inline std::string BitblockToString(const Block& bits)
{
std::stringstream ss;
const std::string bitstring = bits.to_string();
for (std::size_t i = 0; i < BLOCK_SIZE; i += 8)
{
ss << (char)std::bitset<8>(bitstring.substr(i, 8)).to_ulong();
}
return ss.str();
}
//! Will convert a flexible data block to a string
inline std::string BitsToString(const Flexblock& bits)
{
std::stringstream ss;
const std::string bitstring = bits;
for (std::size_t i = 0; i < bits.size(); i += 8)
{
ss << (char)std::bitset<8>(bitstring.substr(i, 8)).to_ulong();
}
return ss.str();
}
//! Turns a fixed data block into a hex-string
inline std::string BitblockToHexstring(const Block& b)
{
std::stringstream ss;
const std::string charset = "0123456789abcdef";
const std::string bstr = b.to_string();
for (std::size_t i = 0; i < bstr.size(); i += 4)
ss << charset[std::bitset<4>(bstr.substr(i, 4)).to_ulong()];
return ss.str();
}
//! Turns a flexible data block into a hex-string
inline std::string BitsToHexstring(const Flexblock& b)
{
std::stringstream ss;
const std::string charset = "0123456789abcdef";
const std::string bstr = b;
for (std::size_t i = 0; i < bstr.size(); i += 4)
ss << charset[std::bitset<4>(bstr.substr(i, 4)).to_ulong()];
return ss.str();
}
//! Turns a hex string into a fixed data block
inline Block HexstringToBitblock(const std::string& hexstring)
{
std::stringstream ss;
for (std::size_t i = 0; i < hexstring.size(); i++)
{
const char c = hexstring[i];
// Get value
std::size_t value;
if ((c >= '0') && (c <= '9'))
// Is it a number?
value = (c - '0') + 0;
else if ((c >= 'a') && (c <= 'f'))
// Else, it is a lowercase letter
value = (c - 'a') + 10;
else
throw std::logic_error("non-hex string detected in HexstringToBits()");
// Append to our bits
ss << std::bitset<4>(value);
}
return Block(ss.str());
}
//! Turns a hex string into a flexible data block
inline Flexblock HexstringToBits(const std::string& hexstring)
{
std::stringstream ss;
for (std::size_t i = 0; i < hexstring.size(); i++)
{
const char c = hexstring[i];
// Get value
std::size_t value;
if ((c >= '0') && (c <= '9'))
// Is it a number?
value = (c - '0') + 0;
else if ((c >= 'a') && (c <= 'f'))
// Else, it is a lowercase letter
value = (c - 'a') + 10;
else
throw std::logic_error("non-hex string detected in HexstringToBits()");
// Append to our bits
ss << std::bitset<4>(value);
}
return ss.str();
}
//! Creates a key of size key-size from a password of arbitrary length.
inline Block PasswordToKey(const std::string& in)
{
Block b;
// Segment the password in segments of key-size, and xor them together.
for (std::size_t i = 0; i < in.size(); i += BLOCK_SIZE / 8)
b ^= StringToBitblock(in.substr(i, BLOCK_SIZE / 8));
return b;
}
//! Will read a file into a flexblock
inline Flexblock ReadFileToBits(const std::string& filepath)
{
// Read file
std::ifstream ifs(filepath, std::ios::binary);
if (!ifs.good())
throw std::runtime_error("Unable to open ifilestream!");
std::stringstream ss;
std::copy(
std::istreambuf_iterator<char>(ifs),
std::istreambuf_iterator<char>(),
std::ostreambuf_iterator<char>(ss)
);
ifs.close();
const std::string bytes = ss.str();
// Convert bytes to bits
return StringToBits(bytes);
}
//! Will save bits to a binary file
inline void WriteBitsToFile(const std::string& filepath, const Flexblock& bits)
{
// Convert bits to bytes
const std::string bytes = BitsToString(bits);
// Write bits to file
std::ofstream ofs(filepath, std::ios::binary);
if (!ofs.good())
throw std::runtime_error("Unable to open ofilestream!");
ofs.write(bytes.data(), bytes.length());
ofs.close();
return;
}
}
/*** ./../GhettoCrypt/Keyset.h ***/
#pragma once
#include <array>
namespace GhettoCipher
{
typedef std::array<Block, N_ROUNDS> Keyset;
}
/*** ./../GhettoCrypt/Feistel.h ***/
#pragma once
namespace GhettoCipher
{
/** Class to perform a feistel block chipher
*/
class Feistel
{
public:
explicit Feistel(const Block& key);
Feistel(const Feistel& other) = delete;
Feistel(Feistel&& other) noexcept = delete;
~Feistel();
//! Will set the seed-key for this feistel network.
//! Roundkeys will be derived from this.
void SetKey(const Block& key);
//! Will encipher a data block via the set seed-key
Block Encipher(const Block& data) const;
//! Will decipher a data block via the set seed-key
Block Decipher(const Block& data) const;
private:
//! Will run the feistel rounds, with either regular key order or reversed key order
Block Run(const Block& data, bool reverseKeys) const;
//! Arbitrary cipher function
static Halfblock F(Halfblock m, const Block& key);
//! Split a data block into two half blocks (into L and R)
static std::pair<Halfblock, Halfblock> FeistelSplit(const Block& block);
//! Combine two half blocks (L and R) into a regular data block
static Block FeistelCombine(const Halfblock& l, const Halfblock& r);
//! Will expand a halfblock to a fullblock
static Block ExpansionFunction(const Halfblock& block);
//! Will compress a fullblock to a halfblock
static Halfblock CompressionFunction(const Block& block);
//! Substitutes four bits by static random others
static std::string SBox(const std::string& in);
//! Will generate a the round keys
void GenerateRoundKeys(const Block& seedKey);
//! Will zero the memory used by the keyset
void ZeroKeyMemory();
Keyset roundKeys;
};
}
/*** ./../GhettoCrypt/Cipher.h ***/
#pragma once
namespace GhettoCipher
{
/** Class to apply a block cipher to messages of arbitrary length in a distributed manner
*/
class Cipher
{
public:
explicit Cipher(const Block& key);
explicit Cipher(const std::string& password);
Cipher(const Cipher& other) = delete;
Cipher(Cipher&& other) noexcept = delete;
~Cipher();
//! Will set the key
void SetKey(const Block& key);
//! Will set the key from a password
void SetPassword(const std::string& password);
//! Will encipher a flexblock of data
Flexblock Encipher(const Flexblock& data, bool printProgress = false) const;
//! Will decipher a flexblock of data
Flexblock Decipher(const Flexblock& data, bool printProgress = false) const;
private:
Block key;
//! Will zero the memory used by the key
void ZeroKeyMemory();
// Initial value for cipher block chaining
static const Block emptyBlock;
};
}

5
INCLUDE/generate.sh
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@ -1,7 +1,8 @@
# Compile single-header
deggl -i ../GhettoCrypt/*.cpp --out GhettoCipher --loc --license-file ../LICENSE
deggl -i ../GhettoCrypt/*.cpp --out GhettoCrypt --loc --license-file ../LICENSE
# Verify that this builds cleanly via g++
echo "Verifying build..."
g++ GhettoCipher.cpp -c -S -o - -Wall > /dev/null
g++ GhettoCrypt.cpp -c -S -o - -Wall > /dev/null
echo "If you saw no compiler errors, everything's good!"

32
readme.md
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@ -25,6 +25,38 @@ It's pretty ghetto, you know?
* For data obfuscation
* If your only other option would be no encryption at all
## How do i use this?
##### Working with strings
```c++
using namespace GhettoCipher;
// Get some string
const std::string input = "I am a super secret message!";
std::cout << input << std::endl;
// Encrypt
const std::string encrypted = GhettoCryptWrapper::EncryptString(input, "password1");
std::cout << encrypted << std::endl;
// Decrypt
const std::string decrypted = GhettoCryptWrapper::DecryptString(encrypted, "password1");
std::cout << decrypted << std::endl;
```
##### Working with files
```c++
using namespace GhettoCipher;
// Encrypt
GhettoCryptWrapper::EncryptFile("main.cpp", "main.cpp.crypt", "password1");
// Decrypt
GhettoCryptWrapper::DecryptFile("main.cpp.crypt", "main.cpp.clear", "password1");
```
If you want to do more complex stuff use the cipher-class [`GhettoCipher::Cipher`](https://github.com/Leonetienne/GhettoCrypt/blob/master/GhettoCrypt/Cipher.h) aswell as the conversion methods in [Util.h](https://github.com/Leonetienne/GhettoCrypt/blob/master/GhettoCrypt/Util.h). This way you can cipher on bitlevel. Examples on how to do this are in [GhettoCryptWrapper.cpp](https://github.com/Leonetienne/GhettoCrypt/blob/master/GhettoCrypt/GhettoCipherWrapper.cpp).
Without saying, this is more advanced and not as-easy as the methods supplied in the wrapper.
### I am not kidding, don't use this for critical stuff! Homebrew ciphers are most often shit!
Especially mine!🦯