VIGENEREimplement.cpp

#include "VIGENEREimplement.h"
#include <algorithm>



// This function generates the key in 
// a cyclic manner until it's length isi'nt 
// equal to the length of original text 
//creates cyclic key
std::string generateKey(std::string str, std::string key)
{
	int x = str.size();

	for (int i = 0; ; i++)
	{
		if (x == i)
			i = 0;
		if (key.size() == str.size())
			break;
		key.push_back(key[i]);
	}
	return key;
}

// This function returns the encrypted text 
// generated with the help of the key 
std::string cipherText(std::string str, std::string key)
{
	std::string cipher_text;

	for (int i = 0; i < str.size(); i++)
	{
		// converting in range 0-25 
		char x = (str[i] + key[i]) % 26;

		// convert into alphabets(ASCII) 
		x += 'A';

		cipher_text.push_back(x);
	}
	return cipher_text;
}

// This function decrypts the encrypted text 
// and returns the original text 
std::string originalText(std::string cipher_text, std::string key)
{
	std::string orig_text;

	for (int i = 0; i < cipher_text.size(); i++)
	{
		// converting in range 0-25 
		char x = (cipher_text[i] - key[i] + 26) % 26;

		// convert into alphabets(ASCII) 
		x += 'A';
		orig_text.push_back(x);
	}
	return orig_text;
}

std::string probe(std::string str)
{
	return "hi";
}