Moved git root and added deggl-build environment

GhettoCrypt/Feistel.h

@@ -0,0 +1,60 @@
+#pragma once
+#include "Keyset.h"
+#include "Block.h"
+#include "Halfblock.h"
+
+namespace GhettoCipher
+{
+	/** Class to perform a feistel block chipher
+	*/
+	class Feistel
+	{
+	public:
+		explicit Feistel(const Block& key);
+
+		Feistel(const Feistel& other) = delete;
+		Feistel(Feistel&& other) noexcept = delete;
+
+		~Feistel();
+
+		//! Will set the seed-key for this feistel network.
+		//! Roundkeys will be derived from this.
+		void SetKey(const Block& key);
+
+		//! Will encipher a data block via the set seed-key
+		Block Encipher(const Block& data) const;
+
+		//! Will decipher a data block via the set seed-key
+		Block Decipher(const Block& data) const;
+
+	private:
+		//! Will run the feistel rounds, with either regular key order or reversed key order
+		Block Run(const Block& data, bool reverseKeys) const;
+
+		//! Arbitrary cipher function
+		static Halfblock F(Halfblock m, const Block& key);
+
+		//! Split a data block into two half blocks (into L and R)
+		static std::pair<Halfblock, Halfblock> FeistelSplit(const Block& block);
+
+		//! Combine two half blocks (L and R) into a regular data block
+		static Block FeistelCombine(const Halfblock& l, const Halfblock& r);
+
+		//! Will expand a halfblock to a fullblock
+		static Block ExpansionFunction(const Halfblock& block);
+
+		//! Will compress a fullblock to a halfblock
+		static Halfblock CompressionFunction(const Block& block);
+
+		//! Substitutes four bits by static random others
+		static std::string SBox(const std::string& in);
+
+		//! Will generate a the round keys
+		void GenerateRoundKeys(const Block& seedKey);
+
+		//! Will zero the memory used by the keyset
+		void ZeroKeyMemory();
+
+		Keyset roundKeys;
+	};
+}