des3r.h

des preko c neznam hocel pomoci

/* DES3r.h */
/* Implementacija DES kriptosustava */
/* 2004. godina */
/* Autor: Darko Poljak */

/* Modifikacija 2005. : reduciran DES na 3 runde */

#ifndef __DES3r
#define __DES3r 1
#include "cryptosystem.h"

// tablice
	/* Permutacija PC1 */
	const static uint8 DES_KiPerm[]={
		57, 49, 41, 33, 25, 17,  9,
		 1, 58, 50, 42, 34, 26, 18,
		10,  2, 59, 51, 43, 35, 27,
		19, 11,  3, 60, 52, 44, 36,
		63, 55, 47, 39, 31, 23, 15,
		 7, 62, 54, 46, 38, 30, 22,
		14,  6, 61, 53, 45, 37, 29,
		21, 13,  5, 28, 20, 12,  4
	};
	/* rotacije za generiranje podkljuceva */
	const static uint8 DES_rot[]={
		1, 1, 2, 2, 2, 2, 2, 2, 1, 2,
		2, 2, 2, 2, 2, 1
	};
	/* permutacija PC2 */
	const static uint8 DES_Ki[]={
		14, 17, 11, 24,  1,  5,
		 3, 28, 15,  6, 21, 10,
		23, 19, 12,  4, 26,  8,
		16,  7, 27, 20, 13,  2,
		41, 52, 31, 37, 47, 55,
		30, 40, 51, 45, 33, 48,
		44, 49, 39, 56, 34, 53,
		46, 42, 50, 36, 29, 32
	};
	/* inicijalna permutacija */
	const static uint8 DES_IP[]={
		58, 50, 42, 34, 26, 18, 10,  2,
		60, 52, 44, 36, 28, 20, 12,  4,
		62, 54, 46, 38, 30, 22, 14,  6,
		64, 56, 48, 40, 32, 24, 16,  8,
		57, 49, 41, 33, 25, 17,  9,  1,
		59, 51, 43, 35, 27, 19, 11,  3,
		61, 53, 45, 37, 29, 21, 13,  5,
		63, 55, 47, 39, 31, 23, 15,  7
	};
	/* ekspanzija 32-bita na 48-bita u F funkciji */
	const static uint8 DES_EBSel[]={
		32,  1,  2,  3, 4,  5,
		 4,  5,  6,  7,  8,  9,
		 8,  9, 10, 11, 12, 13,
		12, 13, 14, 15, 16, 17,
		16, 17, 18, 19, 20, 21,
		20, 21, 22, 23, 24, 25,
		24, 25, 26, 27, 28, 29,
		28, 29, 30, 31, 32,  1
	};
	/* S kutije */
	const static uint8 DES_s[][64]={
		{14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7,
0,  15,  7,  4 ,14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8,
4,   1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0,
15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13},

{15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10,
 3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5,
 0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15,
13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9},

{10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8,
13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1,
13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7,
 1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12},

{7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15,
13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9,
10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4,
 3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14},

{ 2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9,
14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6,
 4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14,
11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3},

{12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11,
10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8,
 9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6,
 4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13},

{ 4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1,
13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6,
 1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2,
 6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12},

{13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7,
 1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2,
 7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8,
 2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11}
	};
	/* permutacija P */
	const static uint8 DES_P[]={
		16,  7, 20, 21, 29, 12, 28, 17,
		 1, 15, 23, 26,  5, 18, 31, 10,
		 2,  8, 24, 14, 32, 27,  3,  9,
		19, 13, 30,  6, 22, 11,  4, 25
	};
	/* konacna permutacija (inverz od IP) */
	const static uint8 DES_IPInv[]={
		40,  8, 48, 16, 56, 24, 64, 32,
		39,  7, 47, 15, 55 ,23 ,63, 31,
		38,  6, 46, 14, 54, 22, 62, 30,
		37,  5, 45, 13, 53, 21, 61, 29,
		36,  4, 44, 12, 52, 20, 60, 28,
		35,  3, 43, 11, 51, 19, 59, 27,
		34,  2, 42, 10, 50, 18, 58, 26,
		33,  1, 41,  9, 49, 17, 57, 25
	};
	/* losi kljucevi */
	const static char *BAD_KEYS[16]={
		"0101010101010101",
		"1F1F1F1F0E0E0E0E",
		"E0E0E0E0F1F1F1F1",
		"FEFEFEFEFEFEFEFE",
		"01FE01FE01FE01FE",
		"FE01FE01FE01FE01",
		"1FE01FE00EF10EF1",
		"E0F1E0F1F10EF10E",
		"01E001E001F101F1",
		"E001E001F101F101",
		"1FFE1FFE0EFE0EFE",
		"FE1FFE1FFE0EFE0E",
		"011F011F010E010E",
		"1F011F010E010E01",
		"E0FEE0FEF1FEF1FE",
		"FEE0FEE0FEF1FEF1"
	};

class DES3r: public CryptoSystem {
private:
	/* glavni kljuc */
	bit _key[64];
	/* podkljucevi */
	bit _subkey[3][48]; /* reducirano na 3 runde */

	/* rotacija lijevo polja bitova a velicine size za r bitova */
	void rotateLeft(bit *a,size_t size,size_t r);
	/* racunanje PC1 ulaza input, rezultat je output */
	void computeKiPerm(bit input[64],bit output[56]);
	/* podjela polja input velicine insize na lijevu i desnu polovicu */
	void splitBlock(bit input[],size_t insize,bit left[],bit right[]);
	/* spajanje dva polja velicine halfsize u jedno polje output */
	void concatBlock(bit left[],bit right[],size_t halfsize,bit output[]);
	/* PC2 */
	void computeKi(bit input[56],bit output[48]);
	/* IP */
	void computeIP(bit input[64],bit output[64]);
	/* F f-ja nad ulazom input, kljucem key, rezultat je output */
	void computeF(bit input[32],bit key[48],bit output[32]);
	/* ekspanzija */
	void computeEBSel(bit input[32],bit output[48]);
	/* racunanje grupe ulaza src sa S kutijom table, izlaz je dest */
	void computeGroup(bit *dest,bit *src,uint16 table);
	/* permutacija P */
	void computeP(bit input[32],bit output[32]);
	/* generiranje podkljuceva */
	void keySchedule();
	/* konacna permutacija */
	void computeIPInv(bit input[64],bit output[64]);

	/* provjera da li je kljuc los */
	bool isBadKey(const string& key);
public:
	/* kriptira block kljucem key, vraca kriptirani tekst */
	virtual string encrypt(const string& block,const string& key);
	/* dekriptira block kljucem key, vraca otvoreni tekst */
	virtual string decrypt(const string& block,const string& key);

	DES3r() {}
};

#endif