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# py_aes
Visited successfully the cryptography lecture and now experimenting a bit with AES in C++ and python.
This short script/library is an approach to understand and implement the AES-128 en-/decryption not only to bit-lists, but also to typical files on your system.
At the moment, files can be en-/decrypted using only the 'electronic-code-book' mode (ECB), with a low security level in python.
Files of each type can be read, since files are opened binary.
Future aspects/goals:
-more modes, like CBC etc.
-additional to files, take whole folders/paths for en-/decryption
-speed up the python script (xx-08-2017: ~10KB/sec)

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lib-cp/aes.cpp Executable file
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#include "aes.hpp"
#include <iostream>
aes::aes(std::string && KeyWord){
set_key(std::vector<unsigned char>(KeyWord.begin(),KeyWord.end()));
}
aes::aes(std::string & KeyWord){
set_key(std::vector<unsigned char>(KeyWord.begin(),KeyWord.end()));
}
aes::aes(std::vector<unsigned> && KeyWord){
set_key(std::vector<unsigned char>(KeyWord.begin(),KeyWord.end()));
}
aes::aes(std::vector<unsigned> & KeyWord){
set_key(std::vector<unsigned char>(KeyWord.begin(),KeyWord.end()));
}
aes::aes(std::vector<unsigned char> && KeyWord){
set_key(KeyWord);
}
aes::aes(std::vector<unsigned char> & KeyWord){
set_key(KeyWord);
}
void aes::set_key(std::vector<unsigned char> && KeyWord){
set_key(KeyWord);
}
void aes::set_key(std::vector<unsigned char> & KeyWord){
_adjust_key_length(KeyWord);
std::vector< std::vector<unsigned char> > KeyMatrix;
for(unsigned i = 0; i < MatDim; i++){
std::vector<unsigned char> NewCol;
for(unsigned j = 0; j < MatDim; j++){
NewCol.push_back(KeyWord[j*4+i]);
}
KeyMatrix.push_back(NewCol);
}
for(unsigned i = 0; i < ((RoundNumber+1)*MatDim); i++){
if(i%MatDim != 0){
std::vector<unsigned char> NewCol;
std::vector<unsigned char>::iterator Prev = KeyMatrix[KeyMatrix.size()-1].begin();
std::transform(KeyMatrix[i].begin(),KeyMatrix[i].end(),std::back_inserter(NewCol),[&Prev](const unsigned char Value){
return Value^*(Prev++);
});
KeyMatrix.push_back(NewCol);
}
else{
std::vector<unsigned char> NewCol;
std::vector< std::vector<unsigned> > _SBox = aes_base::_SBox;
std::transform(KeyMatrix[KeyMatrix.size()-1].begin(),KeyMatrix[KeyMatrix.size()-1].end(),std::back_inserter(NewCol),[_SBox](unsigned char & Value){
return aes_base::_SBox[((Value&240) >> 4)][(Value&15)];
});
std::rotate(NewCol.begin(),NewCol.end()-1,NewCol.end());
NewCol[1] ^= _RoundConst[(int)i/MatDim];
std::vector<unsigned char>::iterator Prev = KeyMatrix[i].begin();
std::transform(NewCol.begin(),NewCol.end(),NewCol.begin(),[&Prev](unsigned char & Value){
return Value^*(Prev++);
});
KeyMatrix.push_back(NewCol);
}
}
std::vector< std::vector<unsigned char> > KeyRoundMatrix;
for(unsigned i = 0; i < (RoundNumber+2); i++){
std::vector<unsigned char> RoundKey;
for(unsigned j = 0; j < MatDim; j++){
RoundKey.push_back(KeyMatrix[(i*MatDim)][j]);
RoundKey.push_back(KeyMatrix[(i*MatDim+1)][j]);
RoundKey.push_back(KeyMatrix[(i*MatDim+2)][j]);
RoundKey.push_back(KeyMatrix[(i*MatDim+3)][j]);
}
KeyRoundMatrix.push_back(RoundKey);
}
_KeyRoundMatrix = KeyRoundMatrix;
_InvKeyRoundMat = KeyRoundMatrix;
std::reverse(_InvKeyRoundMat.begin(),_InvKeyRoundMat.end());
}
std::vector< std::vector<unsigned char> > aes::key(){
return _KeyRoundMatrix;
}
std::vector< std::vector<unsigned char> > aes::key_inverse(){
return _InvKeyRoundMat;
}
unsigned aes::value(){
return _Value;
}
void aes::_adjust_key_length(std::vector<unsigned char> & KeyWord){
if(KeyWord.size() > ByteSize){
KeyWord = std::vector<unsigned char>(KeyWord.begin(),KeyWord.begin()+ByteSize);
}
else{
unsigned LeftBitsSide = 240, RightBitsSide = 15, Idx = 0, Row, Col;
while(KeyWord.size() < ByteSize){
Row = ((KeyWord[Idx]^LeftBitsSide) >> MatDim)%ByteSize;
Col = (KeyWord[Idx]^RightBitsSide)%ByteSize;
KeyWord.push_back(aes_base::_SBox[Row][Col]);
Idx = (Row+Col+KeyWord[KeyWord.size()-1])%ByteSize;
}
}
}

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lib-cp/aes.hpp Executable file
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#ifndef AES_HPP_
#define AES_HPP_
#include <algorithm>
#include <iterator>
#include <vector>
#include <string>
#include "aesbase.hpp"
class aes{
public:
aes(std::string && KeyWord);
aes(std::string & KeyWord);
aes(std::vector<unsigned> && KeyWord);
aes(std::vector<unsigned> & KeyWord);
aes(std::vector<unsigned char> && KeyWord);
aes(std::vector<unsigned char> & KeyWord);
std::vector< std::vector<unsigned char> > key();
std::vector< std::vector<unsigned char> > key_inverse();
void set_key(std::vector<unsigned char> && KeyWord);
void set_key(std::vector<unsigned char> & KeyWord);
bool Init;
unsigned value();
private:
void _adjust_key_length(std::vector<unsigned char> & KeyWord);
std::vector< std::vector<unsigned char> > _KeyRoundMatrix;
std::vector< std::vector<unsigned char> > _InvKeyRoundMat;
const std::vector<unsigned> _RoundConst = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1B,0x36};
const unsigned MatDim = 4;
const unsigned Byte = 8;
const unsigned RoundNumber = 9;
const unsigned ByteSize = 16;
const unsigned BitSize = 128;
unsigned _Value;
};
#endif

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lib-cp/aesbase.cpp Executable file
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#include "aesbase.hpp"
std::vector<unsigned char> aes_base::encrypt(std::vector<unsigned char> PlainMatrix, std::vector<unsigned char> & RoundKeyMatrix){
bool Inverse = false;
std::vector<unsigned char> Matrix = PlainMatrix;
_add_round_key(Matrix,RoundKeyMatrix.begin());
for(unsigned i = 1; i <= _RoundNumber; i++){
_byte_sub(Matrix,Inverse);
_shift_row(Matrix,Inverse);
_mix_columns(Matrix,Inverse);
_add_round_key(Matrix,RoundKeyMatrix.begin()+(i*_MatDim));
}
_byte_sub(Matrix,Inverse);
_shift_row(Matrix,Inverse);
_add_round_key(Matrix,RoundKeyMatrix.begin()+(_RoundNumber*_MatDim));
return Matrix;
}
std::vector<unsigned char> aes_base::decrypt(std::vector<unsigned char> CipherMatrix, std::vector<unsigned char> & RoundKeyMatrix){
bool Inverse = true;
std::vector<unsigned char> Matrix = CipherMatrix;
_add_round_key(Matrix,RoundKeyMatrix.begin());
_shift_row(Matrix,Inverse);
_byte_sub(Matrix,Inverse);
for(unsigned i = 1; i <= _RoundNumber; i++){
_add_round_key(Matrix,RoundKeyMatrix.begin()+(i*_MatDim));
_mix_columns(Matrix,Inverse);
_shift_row(Matrix,Inverse);
_byte_sub(Matrix,Inverse);
}
_add_round_key(Matrix,RoundKeyMatrix.begin()+(_RoundNumber*_MatDim));
return Matrix;
}
void aes_base::_byte_sub(std::vector<unsigned char> & Matrix, bool Inverse){
unsigned Left = 240, Right = 15;
if(Inverse == false){
std::transform(Matrix.begin(),Matrix.end(),Matrix.begin(),[Left,Right](unsigned char & Value){
return _SBox[(Value^Left) >> _MatDim][(Value^Right)];
});
}
else{
std::transform(Matrix.begin(),Matrix.end(),Matrix.begin(),[Left,Right](unsigned char & Value){
return _SBoxInv[(Value^Left) >> _MatDim][(Value^Right)];
});
}
}
void aes_base::_shift_row(std::vector<unsigned char> & Matrix, bool Inverse){
unsigned _MatDim = 4;
if(Inverse == false){
for(unsigned i = 1; i < _MatDim; i++){
std::rotate(Matrix.begin()+(i*_MatDim),Matrix.begin()+(i*_MatDim)+i,Matrix.begin()+((i+1)*_MatDim));
}
}
else{
for(unsigned i = 1; i < _MatDim; i++){
std::rotate(Matrix.begin()+(i*_MatDim),Matrix.begin()+((i+1)*_MatDim)-i,Matrix.begin()+((i+1)*_MatDim));
}
}
}
void aes_base::_mix_columns(std::vector<unsigned char> & Matrix, bool Inverse){
if(Inverse == false){
for(unsigned i = 0; i < _MatDim; i++){
Matrix[i*_MatDim+0] = _g_mul(Matrix[i*_MatDim+0],2)^_g_mul(Matrix[i*_MatDim+1],3)^_g_mul(Matrix[i*_MatDim+2],1)^_g_mul(Matrix[i*_MatDim+3],1);
Matrix[i*_MatDim+1] = _g_mul(Matrix[i*_MatDim+0],1)^_g_mul(Matrix[i*_MatDim+1],2)^_g_mul(Matrix[i*_MatDim+2],3)^_g_mul(Matrix[i*_MatDim+3],1);
Matrix[i*_MatDim+2] = _g_mul(Matrix[i*_MatDim+0],1)^_g_mul(Matrix[i*_MatDim+1],1)^_g_mul(Matrix[i*_MatDim+2],2)^_g_mul(Matrix[i*_MatDim+3],3);
Matrix[i*_MatDim+3] = _g_mul(Matrix[i*_MatDim+0],1)^_g_mul(Matrix[i*_MatDim+1],1)^_g_mul(Matrix[i*_MatDim+2],1)^_g_mul(Matrix[i*_MatDim+3],2);
}
}
else{
for(unsigned i = 0; i < _MatDim; i++){
Matrix[i*_MatDim+0] = _g_mul(Matrix[i*_MatDim+0],14)^_g_mul(Matrix[i*_MatDim+1],11)^_g_mul(Matrix[i*_MatDim+2],13)^_g_mul(Matrix[i*_MatDim+3],9);
Matrix[i*_MatDim+1] = _g_mul(Matrix[i*_MatDim+0],9)^_g_mul(Matrix[i*_MatDim+1],14)^_g_mul(Matrix[i*_MatDim+2],11)^_g_mul(Matrix[i*_MatDim+3],13);
Matrix[i*_MatDim+2] = _g_mul(Matrix[i*_MatDim+0],13)^_g_mul(Matrix[i*_MatDim+1],9)^_g_mul(Matrix[i*_MatDim+2],14)^_g_mul(Matrix[i*_MatDim+3],11);
Matrix[i*_MatDim+3] = _g_mul(Matrix[i*_MatDim+0],11)^_g_mul(Matrix[i*_MatDim+1],13)^_g_mul(Matrix[i*_MatDim+2],9)^_g_mul(Matrix[i*_MatDim+3],14);
}
}
}
void aes_base::_add_round_key(std::vector<unsigned char> & Matrix, std::vector<unsigned char>::iterator MatBegin){
std::transform(Matrix.begin(),Matrix.end(),Matrix.begin(),[&MatBegin](unsigned char & Value){
return Value^*(MatBegin++);
});
}
unsigned char aes_base::_g_mul(unsigned char Value, unsigned char Factor){
if(Factor == 1){
return Value;
}
else if(Factor == 2){
if(Value < 128){
return 2*Value;
}
else{
return (2*Value)^(0x11b);
}
}
else if(Factor == 3){
return _g_mul(Value,2)^Value;
}
else if(Factor == 9){
return _g_mul(_g_mul(_g_mul(Value,2),2),2)^Value;
}
else if(Factor == 11){
return _g_mul(_g_mul(_g_mul(Value,2),2)^Value,2)^Value;
}
else if(Factor == 13){
return _g_mul(_g_mul(_g_mul(Value,2)^Value,2),2)^Value;
}
else if(Factor == 14){
return _g_mul(_g_mul(_g_mul(Value,2)^Value,2)^Value,2);
}
}
const std::vector< std::vector<unsigned> > aes_base::_SBox = {
{0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76},
{0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0},
{0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15},
{0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75},
{0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84},
{0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF},
{0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8},
{0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2},
{0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73},
{0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB},
{0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79},
{0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08},
{0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A},
{0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E},
{0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF},
{0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16}
};
const std::vector< std::vector<unsigned> > aes_base::_SBoxInv = {
{0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB},
{0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB},
{0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E},
{0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25},
{0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92},
{0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84},
{0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06},
{0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B},
{0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73},
{0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E},
{0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B},
{0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4},
{0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F},
{0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF},
{0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61},
{0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D}
};
const unsigned aes_base::_MatDim = 4;
const unsigned aes_base::_ByteSize = 16;
const unsigned aes_base::_RoundNumber = 9;
const unsigned aes_base::_BlockSize = 128;

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lib-cp/aesbase.hpp Executable file
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#ifndef AESBASE_CPP_
#define AESBASE_CPP_
#include <algorithm>
#include <vector>
namespace aes_base{
std::vector<unsigned char> encrypt(std::vector<unsigned char> PlainMatrix, std::vector<unsigned char> & RoundKeyMatrix);
std::vector<unsigned char> decrypt(std::vector<unsigned char> CipherMatrix, std::vector<unsigned char> & RoundKeyMatrix);
void _byte_sub(std::vector<unsigned char> & Matrix, bool Inverse);
void _shift_row(std::vector<unsigned char> & Matrix, bool Inverse);
void _mix_columns(std::vector<unsigned char> & Matrix, bool Inverse);
void _add_round_key(std::vector<unsigned char> & Matrix, std::vector<unsigned char>::iterator MatBegin);
unsigned char _g_mul(unsigned char Value, unsigned char Factor);
extern const std::vector< std::vector<unsigned> > _SBox;
extern const std::vector< std::vector<unsigned> > _SBoxInv;
extern const unsigned _MatDim;
extern const unsigned _ByteSize;
extern const unsigned _RoundNumber;
extern const unsigned _BlockSize;
};
#endif

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lib-cp/main.cpp Executable file
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#include <iostream>
#include <vector>
#include <string>
#include "aes.hpp"
int main(){
std::vector<unsigned> Key = {0x1a,0x58,0x2a,0x1b,0xa1,0x0e,0xa0,0x18,0xf1,0x4a,0xc3,0x11,0xaa,0x2a,0xc1,0xff};
aes CryptoSystem(Key);
std::vector< std::vector<unsigned char> > AES_Key = CryptoSystem.key();
for(auto RoundKey : AES_Key){
for(auto Value: RoundKey){
std::cout << (char)(Value+'A') << ' ';
}
std::cout << std::endl;
}
AES_Key = CryptoSystem.key_inverse();
for(auto RoundKey : AES_Key){
for(auto Value: RoundKey){
std::cout << (char)(Value+'A') << ' ';
}
std::cout << std::endl;
}
}

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lib-py/aes.py Executable file
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import argparse, itertools, os
from copy import deepcopy
from os import path
class aes_base:
_SBox = [
[0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76],
[0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0],
[0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15],
[0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75],
[0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84],
[0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF],
[0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8],
[0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2],
[0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73],
[0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB],
[0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79],
[0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08],
[0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A],
[0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E],
[0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF],
[0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16]
]
_SBoxInv = [
[0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB],
[0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB],
[0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E],
[0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25],
[0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92],
[0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84],
[0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06],
[0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B],
[0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73],
[0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E],
[0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B],
[0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4],
[0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F],
[0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF],
[0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61],
[0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D]
]
ByteSize = 8
RoundNumber = 9
BlockSize = 128
def encrypt(PlainTextMatrix,KeyRoundMatrix):
Inverse = False
ARK = aes_base._add_round_key(PlainTextMatrix,aes_base._get_round_key(KeyRoundMatrix,0))
for i in range(aes_base.RoundNumber):
BSB = aes_base._byte_sub(ARK,Inverse)
SR = aes_base._shift_row(BSB,Inverse)
MC = aes_base._mix_columns(SR,Inverse)
ARK = aes_base._add_round_key(MC,aes_base._get_round_key(KeyRoundMatrix,i+1))
BSB = aes_base._byte_sub(ARK,Inverse)
SR = aes_base._shift_row(BSB,Inverse)
ARK = aes_base._add_round_key(SR,aes_base._get_round_key(KeyRoundMatrix,aes_base.RoundNumber+1))
return ARK
def decrypt(CipherTextMatrix,KeyRoundMatrix):
Inverse = True
ARK = aes_base._add_round_key(CipherTextMatrix,aes_base._get_round_key(KeyRoundMatrix,0))
SR = aes_base._shift_row(ARK,Inverse)
BSB = aes_base._byte_sub(SR,Inverse)
for i in range(aes_base.RoundNumber):
ARK = aes_base._add_round_key(BSB,aes_base._get_round_key(KeyRoundMatrix,i+1))
MC = aes_base._mix_columns(ARK,Inverse)
SR = aes_base._shift_row(MC,Inverse)
BSB = aes_base._byte_sub(SR,Inverse)
ARK = aes_base._add_round_key(BSB,aes_base._get_round_key(KeyRoundMatrix,aes_base.RoundNumber+1))
return ARK
def _byte_sub(Matrix,Inverse = False):
if Inverse == False:
return [[aes_base._SBox[int(bin(Value)[2:].zfill(8)[:aes_base.ByteSize//2],2)][int(bin(Value)[2:].zfill(8)[aes_base.ByteSize//2:],2)] for Value in Row] for Row in Matrix]
else:
return [[aes_base._SBoxInv[int(bin(Value)[2:].zfill(8)[:aes_base.ByteSize//2],2)][int(bin(Value)[2:].zfill(8)[aes_base.ByteSize//2:],2)] for Value in Row] for Row in Matrix]
def _shift_row(Matrix,Inverse = False):
if Inverse == False:
return [aes_base._row_rotate(Row,Idx) for Idx,Row in enumerate(Matrix)]
else:
return [aes_base._row_rotate(Row,Idx,True) for Idx,Row in enumerate(Matrix)]
def _mix_columns(Matrix,Inverse = False):
MC = deepcopy(Matrix)
if Inverse == False:
for i in range(aes_base.ByteSize//2):
MC[0][i] = aes_base._g_mul(Matrix[0][i],2)^aes_base._g_mul(Matrix[1][i],3)^aes_base._g_mul(Matrix[2][i],1)^aes_base._g_mul(Matrix[3][i],1)
MC[1][i] = aes_base._g_mul(Matrix[0][i],1)^aes_base._g_mul(Matrix[1][i],2)^aes_base._g_mul(Matrix[2][i],3)^aes_base._g_mul(Matrix[3][i],1)
MC[2][i] = aes_base._g_mul(Matrix[0][i],1)^aes_base._g_mul(Matrix[1][i],1)^aes_base._g_mul(Matrix[2][i],2)^aes_base._g_mul(Matrix[3][i],3)
MC[3][i] = aes_base._g_mul(Matrix[0][i],3)^aes_base._g_mul(Matrix[1][i],1)^aes_base._g_mul(Matrix[2][i],1)^aes_base._g_mul(Matrix[3][i],2)
else:
for i in range(aes_base.ByteSize//2):
MC[0][i] = aes_base._g_mul(Matrix[0][i],14)^aes_base._g_mul(Matrix[1][i],11)^aes_base._g_mul(Matrix[2][i],13)^aes_base._g_mul(Matrix[3][i],9)
MC[1][i] = aes_base._g_mul(Matrix[0][i],9)^aes_base._g_mul(Matrix[1][i],14)^aes_base._g_mul(Matrix[2][i],11)^aes_base._g_mul(Matrix[3][i],13)
MC[2][i] = aes_base._g_mul(Matrix[0][i],13)^aes_base._g_mul(Matrix[1][i],9)^aes_base._g_mul(Matrix[2][i],14)^aes_base._g_mul(Matrix[3][i],11)
MC[3][i] = aes_base._g_mul(Matrix[0][i],11)^aes_base._g_mul(Matrix[1][i],13)^aes_base._g_mul(Matrix[2][i],9)^aes_base._g_mul(Matrix[3][i],14)
return MC
def _add_round_key(Matrix,KeyRoundMatrix):
return [[Value^KeyRoundMatrix[Idx][Jdx] for Jdx,Value in enumerate(Row)] for Idx,Row in enumerate(Matrix)]
def _row_rotate(OldRow,Rotation,Inverse = False):
Row = deepcopy(OldRow)
if Inverse == False: #to left
for i in range(Rotation):
Row.append(Row.pop(0))
else:
for i in range(Rotation):
Row.insert(0,Row.pop())
return Row
def _g_mul(Value,Factor):
if Factor == 1:
return Value
elif Factor == 2:
if Value < 2**7:
return 2*Value
else:
return (2*Value)^(0x11b)
elif Factor == 3:
return aes_base._g_mul(Value,2)^Value
elif Factor == 9:
return aes_base._g_mul(aes_base._g_mul(aes_base._g_mul(Value,2),2),2)^Value
elif Factor == 11:
return aes_base._g_mul(aes_base._g_mul(aes_base._g_mul(Value,2),2)^Value,2)^Value
elif Factor == 13:
return aes_base._g_mul(aes_base._g_mul(aes_base._g_mul(Value,2)^Value,2),2)^Value
elif Factor == 14:
return aes_base._g_mul(aes_base._g_mul(aes_base._g_mul(Value,2)^Value,2)^Value,2)
def _get_round_key(KeyRoundMatrix,Round):
return [[Col[i] for Col in KeyRoundMatrix[Round*(aes_base.ByteSize//2):(Round+1)*aes_base.ByteSize]] for i in range(aes_base.ByteSize//2)]
class aes:
MatDim = 4
Byte = 8
ByteSize = 16
BitSize = 128
RoundConst = [0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1B,0x36]
def __init__(self,Key,OpMode = 'ECB'):
self._OpMode = OpMode
self._KeyRoundMatrix = aes._key_expansion(Key)
self._InvKeyRoundMat = aes._key_inversion(self._KeyRoundMatrix)
self._Format = list
def encrypt(self,TextString):
ByteMatrix = self._format_input(TextString)
EncryptMatrix = aes_base.encrypt(ByteMatrix,self._KeyRoundMatrix)
Encryption = self._format_output(EncryptMatrix)
return Encryption
def encrypt_file(self,FileName):
File = open(FileName,'r+b')
Block = 'EMPTY'
TextLeng = 0
while len(Block) != 0:
WritePos = File.tell()
Block = File.read(aes.ByteSize)
TextLeng += len(Block)
if len(Block) != 0:
File.seek(WritePos)
File.write(self.encrypt(Block))
File.write(self.encrypt(aes._size_to_bytes(TextLeng)))
File.close()
def encrypt_folder(self,FolderName):
Files = []
Folders = []
for Item in os.listdir(FolderName):
PathName = path.join(FolderName,Item)
if path.isfile(PathName):
Files.append(PathName)
elif path.isdir(PathName):
Folders.append(PathName)
for File in Files:
self.encrypt_file(File)
File = []
for Folder in Folders:
self.encrypt_folder(Folder)
def decrypt(self,TextString):
ByteMatrix = self._format_input(TextString)
DecryptMatrix = aes_base.decrypt(ByteMatrix,self._InvKeyRoundMat)
Decryption = self._format_output(DecryptMatrix)
return Decryption
def decrypt_file(self,FileName):
File = open(FileName,'r+b')
Block = 'EMPTY'
while len(Block) != 0:
WritePos = File.tell()
Block = File.read(aes.ByteSize)
if len(Block) != 0:
File.seek(WritePos)
File.write(self.decrypt(Block))
File.seek(WritePos-aes.ByteSize)
TextLeng = aes._bytes_to_size(File.read(aes.ByteSize))
if(TextLeng < (2**64-1)):
File.seek(0)
File.truncate(TextLeng)
File.close()
def decrypt_folder(self,FolderName):
Files = []
Folders = []
for Item in os.listdir(FolderName):
PathName = path.join(FolderName,Item)
if path.isfile(PathName):
Files.append(PathName)
elif path.isdir(PathName):
Folders.append(PathName)
for File in Files:
self.decrypt_file(File)
File = []
for Folder in Folders:
self.decrypt_folder(Folder)
def _key_expansion(Key):
KeyMatrix = list(bytes(Key.encode()))
LeftBitsSide = 2**aes.Byte-2**(aes.Byte//2)
RightBitsSide = 2**aes.Byte-1
Idx = 0
while(len(KeyMatrix) != aes.ByteSize):
Row = ((KeyMatrix[Idx]&LeftBitsSide) >> aes.Byte//2)%aes.ByteSize
Col = ((KeyMatrix[Idx]&RightBitsSide))%aes.ByteSize
KeyMatrix.append(aes_base._SBox[Row][Col])
Idx = (Row+Col+KeyMatrix[-1])%aes.ByteSize
KeyRoundMatrix = [KeyMatrix[i*aes.MatDim:(i+1)*aes.MatDim] for i in range(aes.MatDim)]
for i in range(aes.MatDim*(aes_base.RoundNumber+1)):
if i%(aes.MatDim) != 0:
KeyRoundMatrix.append([KeyRoundMatrix[i][Idx]^Value for Idx,Value in enumerate(KeyRoundMatrix[-1])])
else:
KeyTrafo = aes._key_col_trafo(KeyRoundMatrix[-1],i)
KeyRoundMatrix.append([KeyRoundMatrix[i][Idx]^Value for Idx,Value in enumerate(KeyTrafo)])
return KeyRoundMatrix
def _key_col_trafo(Col,Round):
return [aes._key_sbox_trafo(Col[3]), aes._key_sbox_trafo(Col[0])^aes.RoundConst[Round//aes.MatDim], aes._key_sbox_trafo(Col[1]), aes._key_sbox_trafo(Col[2])]
def _key_sbox_trafo(Value):
return aes_base._SBox[((Value^(2**aes.Byte-2**(aes.Byte//2))) >> aes.Byte//2)%aes.ByteSize][((Value^(2**aes.Byte-1)))%aes.ByteSize]
def _key_inversion(KeyMatrix):
return list(itertools.chain.from_iterable(reversed([KeyMatrix[(i*aes.MatDim):(i+1)*aes.MatDim] for i in range(aes_base.RoundNumber+2)])))
def _8bit_to_byte(Bits):
Byte = 0
for Idx,Bit in enumerate(reversed(Bits)):
Byte |= (Bit << Idx)
return Byte
def _size_to_bytes(Size):
BitList = list(map(int,list(bin(Size)[2:].zfill(aes.BitSize))))
return bytes([ aes._8bit_to_byte(BitList[i*aes.Byte:(i+1)*aes.Byte]) for i in range(aes.ByteSize)])
def _bytes_to_size(Bytes):
return int(''.join([ bin(Block)[2:].zfill(aes.Byte) for Block in list(Bytes)]),2)
def _format_input(self,TextString):
ByteList = []
ByteMatrix = []
if type(TextString) is str:
ByteList = list(TextString.encode())
ByteList.extend([255]*(aes.ByteSize-len(ByteList)))
self._Format = bytes
elif type(TextString) is bytes:
ByteList = list(TextString)
ByteList.extend([255]*(aes.ByteSize-len(ByteList)))
self._Format = bytes
elif type(TextString) is list:
ByteList = [int(Sig) for Sig in TextString]+[255]*(aes.ByteSize-len(TextString))
self._Format = list
else:
raise TypeError('Input must be either String, Bytes or List')
if len(ByteList) == aes.ByteSize:
ByteMatrix = [ByteList[i*aes.MatDim:(i+1)*aes.MatDim] for i in range(aes.MatDim)]
elif len(ByteList) == aes.BitSize:
pass #TODO 128-BitList to 16Byte Matrix
else:
raise ValueError('Input must contain 16 Bytes or 128 Bits')
return ByteMatrix
def _format_output(self,ByteMatrix):
TextString = list(itertools.chain.from_iterable(ByteMatrix))
if self._Format is bytes:
TextString = bytes(TextString)
return TextString
Parser = argparse.ArgumentParser(description='En-/Decryption for Strings,Files and Folders')
Parser.add_argument('--file', metavar='<PATH_TO_FILE>', type=str, nargs=1, help='File that should be en-/decrypted.', required = False)
Parser.add_argument('--folder', metavar='<PATH>', type=str, nargs=1, help='Folder with files that should be en-/decrypted; recursive.', required = False)
Parser.add_argument('--text', metavar='<PATH_TO_FILE>', type=str, nargs=1, help='File that should be en-/decrypted.', required = False)
Parser.add_argument('--key', metavar='<KEY>', type=str, nargs=1, help='asdf', required = True)
Parser.add_argument('--decrypt', help='Enable input file decryption', action='store_true', required = False)
Args = Parser.parse_args()
KeyWord = Args.key[0]
Decryption = Args.decrypt
CryptoSystem = aes(KeyWord)
if not (Args.file or Args.folder or Args.text):
Parser.error('one of the following arguments is requested: --file, --folder, --text')
if Decryption == False:
if Args.file:
CryptoSystem.encrypt_file(Args.file[0])
elif Args.folder:
CryptoSystem.encrypt_folder(Args.folder[0])
else:
if Args.file:
CryptoSystem.decrypt_file(Args.file[0])
elif Args.folder:
CryptoSystem.decrypt_folder(Args.folder[0])

2
lib-py/sample.dat Executable file
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@ -0,0 +1,2 @@
This is my textfile and I like it very much!
\\Herro!!$$@@

2
lib-py/sample_folder/sample.dat Executable file
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This is my textfile and I like it very much!
\\Herro!!$$@@

2
lib-py/sample_folder/sample2.dat Executable file
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This is my textfile and I like it very much!
\\Herro!!$$@@ This is another FILE

2
lib-py/sample_folder/sample2_folder/sample.dat Executable file
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@ -0,0 +1,2 @@
This is my textfile and I like it very much!
\\Herro!!$$@@

2
lib-py/sample_folder/sample2_folder/sample2.dat Executable file
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@ -0,0 +1,2 @@
This is my textfile and I like it very much!
\\Herro!!$$@@ This is another FILE