Added Playfair Cipher

Headers/Playfair.hpp

@@ -0,0 +1,50 @@
+//Ciphers/Headers/Playfair.hpp
+//Matthew Ellison
+// Created: 4-25-18
+//Modified: 4-25-18
+//This file contains the declaration of the Playfair class
+//It is designed to encrypt and decrypt strings using the Playfair cipher
+
+
+#ifndef PLAYFAIR_HPP
+#define PLAYFAIR_HPP
+
+#include <string>
+
+
+class Playfair{
+private:
+	static char REPLACED;	//The letter that will need to be replaced in the grid and any input string or keyword
+	static char REPLACER;	//The letter that replaced REPLACED in any input string or keyword
+	static char DOUBLED;	//The letter that will be placed between double letters in the input string if necessary or to make the string length even
+	std::string inputString;
+	std::string outputString;
+	std::string keyword;
+	char grid[5][5];
+	void createGrid();
+	bool checkGrid(const char letter) const;
+	void searchGrid(char letter, int& row, int& col);
+public:
+	Playfair();
+	~Playfair();
+	void reset();
+	std::string encode();
+	std::string encode(std::string keyword, std::string input);
+	std::string decode();
+	std::string decode(std::string keyword, std::string input);
+	void setKeyword(std::string key);
+	std::string getKeyword() const;
+	void setInputString(std::string input);
+	std::string getInputString() const;
+	std::string getOutputString() const;
+	std::string getGrid() const;
+	//Change static variables
+	static char getReplaced();
+	static void setReplaced(const char replaced);
+	static char getReplacer();
+	static void setReplacer(const char replacer);
+	static char getDoubled();
+	static void setDoubled(const char doubled);
+};
+
+#endif //PLAYFAIR_HPP