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xor.cpp
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xor.cpp
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#include "xor.h"
//xor's two strings of binary numbers that are equal length
string X_OR_byte(string &a, string &b) {
int i = 0;
string out = "";
while(i < a.size()) {
if(a[i] == b[i]) {
out +="0";
}
else {
out +="1";
}
i++;
}
return out;
}
//performs fixed xor on two Hex strings of equal length
string fixedXor(string &a,string &b) {
string foo = "";
string bar = "";
for(int i = 0; i < a.size(); i++) {
foo += hextobin(a[i]);
}
for(int i = 0; i < b.size(); i++) {
bar += hextobin(b[i]);
}
string output = X_OR_byte(foo,bar);
int i = 0;
string result = "";
while(i < output.size()) {
string temp = "";
temp = output[i];
temp += output[i+1];
temp += output[i+2];
temp += output[i+3];
result += bintohex(temp);
i = i + 4;
}
return result;
}
//this function performs all possible xor operations on the given input
//the input string must be composed of '0''s and '1''s and must be a multiple of 8 in length
vector <string> X_OR(string &input) {
string hexmatrix[16] = {"0000","0001","0010","0011","0100","0101","0110","0111","1000","1001","1010","1011","1100","1101","1110","1111"};
vector <string> outputs;
for(int i = 0; i < 16; i++) {
for(int j = 0; j < 16; j++) {
string temp = "";
for(int k = 0; k < input.size();k = k+8) {
string a = hexmatrix[i] + hexmatrix[j];
string b = "";
b += input[k];
b += input[k+1];
b += input[k+2];
b += input[k+3];
b += input[k+4];
b += input[k+5];
b += input[k+6];
b += input[k+7];
temp += X_OR_byte(a,b);
}
outputs.push_back(temp);
}
}
return outputs;
}
//prints all possible XOR results
int sByteXor(string &input) {
ofstream output("plaintexts.txt");
string temp = "";
//convert input argument from hex to it's binary equivalent, store in string temp
for(int i = 0; i < input.size(); i++) {
temp += hextobin(input[i]);
}
//cout << "temp = " << temp << "\n";
//perform all possible xor operations, store result in xor_results
vector <string> xor_results = X_OR(temp);
//this for loop converts each xor result from binary to ascii and stores it in ascii_results
for(int i = 0; i < xor_results.size(); i++) {
string bar = "";
for(int j = 0; j < xor_results[i].size(); j = j + 8) {
string foo = "";
foo += xor_results[i][j];
foo += xor_results[i][j+1];
foo += xor_results[i][j+2];
foo += xor_results[i][j+3];
foo += xor_results[i][j+4];
foo += xor_results[i][j+5];
foo += xor_results[i][j+6];
foo += xor_results[i][j+7];
bar += bintoc(foo);
}
output << bar << "\n";
}
output.close();
return 0;
}
int sByteXor(string &input, ofstream &output) {
//perform all possible xor operations, store result in xor_results
vector <string> xor_results = X_OR(input);
//this for loop converts each xor result from binary to ascii and stores it in ascii_results
for(int i = 0; i < xor_results.size(); i++) {
string bar = "";
for(int j = 0; j < xor_results[i].size(); j = j + 8) {
string foo = "";
foo += xor_results[i][j];
foo += xor_results[i][j+1];
foo += xor_results[i][j+2];
foo += xor_results[i][j+3];
foo += xor_results[i][j+4];
foo += xor_results[i][j+5];
foo += xor_results[i][j+6];
foo += xor_results[i][j+7];
bar += bintoc(foo);
}
output << bar << "\n";
}
return 0;
}
int detectXor() {
string inputfile;
//get name of input file with hex encoded single byte XOR encrypted ciphertexts.
cout << "Enter the name of an existing text file in the current directory: ";
cin >> inputfile;
ifstream input(inputfile);
//open output file
ofstream output("plaintexts.txt");
string bar = "";
while(input.good()) {
string temp = "";
string baz = "";
//get line (ciphertext) from input, store in baz
getline(input,baz);
//compute all possible plaintexts, write store them in ascii_results vector
if(input.good()) {
//convert hex to binary, store in temp
for(int i = 0; i < baz.size(); i++) {
temp += hextobin(baz[i]);
}
//cout << "temp = " << temp << "\n";
//perform xor, all possible xor results are stored in the vector
vector <string> xor_results = X_OR(temp);
vector <string> ascii_results;
//convert every xor result from binary to the corresponding ascii characters
for(int i = 0; i < xor_results.size(); i++) {
string bar = "";
for(int j = 0; j < xor_results[i].size(); j = j + 8) {
string foo = "";
foo += xor_results[i][j];
foo += xor_results[i][j+1];
foo += xor_results[i][j+2];
foo += xor_results[i][j+3];
foo += xor_results[i][j+4];
foo += xor_results[i][j+5];
foo += xor_results[i][j+6];
foo += xor_results[i][j+7];
bar += bintoc(foo);
}
//store ascii characters in ascii_results vector
ascii_results.push_back(bar);
}
//print all ascii_results
for(int i = 0; i < ascii_results.size(); i++) {
bar = ascii_results[i] + "\n";
output << bar;
}
}
}
//close input and output files
input.close();
output.close();
return 0;
}
int repeating_Xor(string &key) {
string inputFile;
cout << "Enter the name of an existing text file in the current directory: ";
cin >> inputFile;
//open input file for reading
ifstream input(inputFile);
ofstream output("repeating_xor_output.txt");
string output_bin = "";
string bin_text = "";
while(input.good()) {
char c = input.get();
//if input is still valid
if(input.good()) {
//convert character from input to 8bit binary string
bin_text += ctobin(c);
}
}
string bin_key="";
for(int i = 0; i < key.size(); i++) {
bin_key += ctobin(key[i]);
}
int foo = 0;
for(int i = 0; i < bin_text.size(); i = i + 8) {
string temp = "";
temp += bin_text[i];
temp += bin_text[i+1];
temp += bin_text[i+2];
temp += bin_text[i+3];
temp += bin_text[i+4];
temp += bin_text[i+5];
temp += bin_text[i+6];
temp += bin_text[i+7];
string bar = "";
bar += bin_key[foo];
bar += bin_key[foo+1];
bar += bin_key[foo+2];
bar += bin_key[foo+3];
bar += bin_key[foo+4];
bar += bin_key[foo+5];
bar += bin_key[foo+6];
bar += bin_key[foo+7];
foo += 8;
foo = foo % 24;
//cout << "XORing " << temp << " with key " << bar <<", result: " << X_OR_byte(temp,bar) << "\n";
//cout << "foo = " << foo << "\n";
output_bin += X_OR_byte(temp,bar);
}
input.close();
for(int i = 0; i < output_bin.size(); i = i +4) {
string temp = "";
temp += output_bin[i];
temp += output_bin[i+1];
temp += output_bin[i+2];
temp += output_bin[i+3];
output << bintohex(temp);
}
output.close();
return 0;
}
int break_Rkey_Xor() {
string inputFile;
cout << "Enter the name of an existing text file in the current directory: ";
cin >> inputFile;
//open input file for reading
ifstream input(inputFile);
string bin_text = "";
//this while loop converts the input to binary form
while(input.good()) {
char c = input.get();
//if input is still valid
if(input.good()) {
bin_text += hextobin(c);
}
}
input.close();
int pos[3];
find_shortest_distances(bin_text,pos);
vector <string> keyOneBlocks = breakIntoBlocks(pos[0],bin_text);
vector <string> keyTwoBlocks = breakIntoBlocks(pos[1],bin_text);
vector <string> keyThreeBlocks = breakIntoBlocks(pos[2],bin_text);
vector <string> keyOneTranspose = transpose(keyOneBlocks);
vector <string> keyTwoTranspose = transpose(keyTwoBlocks);
vector <string> keyThreeTranspose = transpose(keyThreeBlocks);
ofstream output("keyOneoutput.txt");
for(int i = 0; i < keyOneTranspose.size(); i++) {
sByteXor(keyOneTranspose[i],output);
}
output.close();
ofstream output2("keyTwooutput.txt");
for(int i = 0; i < keyTwoTranspose.size(); i++) {
sByteXor(keyTwoTranspose[i],output2);
}
output2.close();
ofstream output3("keyThreeoutput.txt");
for(int i = 0; i < keyThreeTranspose.size(); i++) {
sByteXor(keyThreeTranspose[i],output3);
}
output3.close();
return 0;
}