des.h

包涵了密码学教程里面的大部分加密算法

#include <stdio.h>
#include <stdlib.h>

//初始置换矩阵
static int IP_1[64] = {
	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};

//密钥生成扩展矩阵
static int E[48] = {
	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};

//密钥生成压缩矩阵
static int P[32] = {
	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};

//密钥置换矩阵1，剔除掉8位奇偶校验位
static int PC_1[56] = {
	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};

//密钥置换矩阵2
static int PC_2[48] = {
	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};

//逆初始置换矩阵
static int IP_2[64] = {
	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};

//S盒1
static int SP_1[4][16] = {
	{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}};

//S盒2
static int SP_2[4][16] = {
	{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}};

//S盒3
static int SP_3[4][16] = {
	{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}};

//S盒4
static int SP_4[4][16] = {
	{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}};

//S盒5
static int SP_5[4][16] = {
    {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}};

//S盒6
static int SP_6[4][16] = {
	{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}};

//S盒7
static int SP_7[4][16] = {
    {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}};

//S盒8
static int SP_8[4][16] = {
	{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},
	{1,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
	{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}};



//初始置换的实现
void desIP1(char PlainText1[64], char PlainText[64]);

//逆初始置换的实现
void desIP2(char PlainText1[64], char PlainText2[64]);

//将置换后的明文分为左右两部分
void divide(char PlainText1[64], char PlainText2[32], char PlainText3[32]);

//将运算后的两部分密文合成
void compose(char Cipher1[64], char Cipher2[32], char Cipher3[32]);

//产生密钥时的初始置换
void desPC1(char Key1[64], char Key2[56]);

//将56位密钥分成两部分
void C0D0(char Key1[56], char Key2[28], char Key3[28]);

//左循环一位或两位运算
void LS(char Key1[28], int n, char Key2[28]);

//密钥产生过程中的合成运算
void CD(char Key1[56], char Key2[28], char Key3[28]);

//产生密钥过程中的第二次置换
void desPC2(char Key1[56], char Key2[48]);

//生成密钥
void des_key(char Key1[64], char Key2[48]);

//扩展运算，32->48
void desE(char PlainText1[32], char PlainText2[48]);

//f函数中异或运算
void EJB(char EE[48], char JJ[48], char BB[48]); 

//f函数中的P置换
void desP(char C1[32], char C2[32]);

//f函数中的S盒变换
void desS(char BB[48], char CC[32]);

//f函数的实现
void desf();

//产生明文右半部分时的异或运算
void createR(char LL[32], char ff[32], char RR[32]);