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109#include <iostream>
#include <vector>
//function for deistel round
class Feistel()
{
std::string message;
int num_keys;
std::vector<int> keys;
void Feistel()
{
// Specifying innput
std::cout<<"Enter the secret message: ";
std::cin>>message;
std::cout<<"\n Specify Number of keys: ";
std::cin>>num_keys;
std::cout<<"\n Enter Keys one by one: \n";
for(int i=0;i<num_keys;i++)
{
int key;
std::cin>>key;
std::cout<<std::endl;
keys.push_back(key);
}
//Process
std::cout<<"\n---------------------Process-----------------------------";
std::cout<<"\nOriginal message: \n"<<message;
std::string enc_msg{Encode(message,keys)};
std::cout<<"\n Encoded messgae: "<<enc_msg;
std::cout<<"\n Decoded messgae: "<<eDecode(enc_msg,keys);
}
std::string F(std::string buffer,double key)
{
//function working with keys
str::string processed_buffer;
for(auto itr = buffer.rbegin(); itr != buffer.rend(); itr++ )
processed_buffer.push_back((*itr)+key)
return processed_buffer;
}
std::string Encode(std::string msg,std::vector<double> keys;)
{
std::string encoded{msg};
int no_of_rounds = keys.size();
// split in half
//specify left and right containers
std::string left,right;
encoded.copy(left,no_of_rounds/2,0);
encoded.copy(right,no_of_rounds,no_of_rounds/2);
//run feistel round in loops
for(auto key = keys.begin();key != keys.end(); key++)
{ //for each instance in loop
std::string buffer;
/*Convert the string to binary*/
///the processs of conversion
buffer=F(right,key);
// left= left XOR buffer
// left , right = right , left
right.swap(left)
}
// left , right = right , left
right.swap(left)
encoded{left+right};
return encoded;
}
std::string Decode(std::string msg,std::vector<double> keys;)
{
std::string decoded{msg};
int no_of_rounds = keys.size();
// split in half
//specify left and right containers
std::string left,right;
decoded.copy(left,no_of_rounds/2,0);
decoded.copy(right,no_of_rounds,no_of_rounds/2);
//run feistel round in loops
for(auto key = keys.rbegin();key != keys.rend(); key++)
{ //for each instance in loop
std::string buffer;
buffer=F(right,key);
// left= left XOR buffer
// left , right = right , left
right.swap(left)
}
// left , right = right , left
right.swap(left)
decoded{left+right}
return decoded;
}
}
int main()
{
//Class declaration
return 0;
}