#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include "bmp.h"
#include "playfair.h"



char* reverse(const char* text)
{
	
	
	int ls = 0;
	int ps = strlen(text) - 1;

if(text!=NULL)
{
	while (ls < ps)
	{
		char a = text[ls];
		text[ls] = text[ps];
		text[ps] = a;
		ls++;
		ps--;
	}
//	printf("%s", text);
	 return text;
}
else
return NULL;

}

char* vigenere_encrypt(const char* key, const char* text)
{
	char encrypt[100];
	int number[26]={ 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25};
	
	for(int i=0; i<=strlen(text); i++)
	{
		int result=0, resultt=0;
		int pocet=0, pocett=0;
		while(text[i]!=ALPHA[pocet]){
			pocet++;
		}
		while(key[i]!=ALPHA[pocett]){
			pocett++;
		}
		result = number[pocet]+number[pocett];
		if(result>26){
			resultt= result-26;
		}
		else{
			resultt = result;
		}
		
		ALPHA[resultt] = encrypt[i];
	
	}
	return encrypt;
}

char* vigenere_decrypt(const char* key, const char* encrypt)
{
	char dencrypt[100];
	int number[26]={ 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25};
	
	for(int i=0; i<=strlen(encrypt); i++)
	{
		int result=0, resultt=0;
		int pocet=0, pocett=0;
		while(encrypt[i]!=ALPHA[pocet]){
			pocet++;
		}
		while(key[i]!=ALPHA[pocett]){
			pocett++;
		}
		result = number[pocet]-number[pocett];
		if(result<0){
			resultt= result+26;
		}
		else{
			resultt = result;
		}
		
		ALPHA[resultt] = dencrypt[i];
	
	}
	return dencrypt;
}

unsigned char* bit_encrypt(const char* text)
{
	
}

char* bit_decrypt(const unsigned char* text)
{
	
}