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DES算法是一种最通用的对称密钥算法，因为算法本身是公开的，所以其安全性在于密钥的安全性。基于密钥的算法通常有两类：对称算法和公开密钥算法。对称算法的对称性体现在加密密钥能够从解密密钥推算出来，反之亦然。
在大多数对称算法中，加解密的密钥是相同的，DES就是这样。可见，对称密钥算法的加解密密钥都是保密的。而公开密钥算法的加密密钥是公开的，解密密钥是保密的。
DES具体算法如下：
//////////////////////////////////////////////////////////////////////////
/*
Provided by 朱孟斌, National University Of Technology
Email: zmbtsubasa@gmailcom
This product is free for use
*/
//////////////////////////////////////////////////////////////////////////
#ifndef Des_H
#define Des_H
//! enum bool{false,true};
/*!
if bool is not supported,use this or just replace with char and use 1 for true,0 for false;
@see enum {ENCRYPT,DECRYPT};
*/
enum {ENCRYPT,DECRYPT};
/*@brief 16圈子密钥*/
static bool SubKey[2][16][48];// 16圈子密钥
/*@brief 3次DES标志*/
static bool Is3DES;// 3次DES标志
static char Tmp[256];
static char deskey[16];
typedef bool (*PSubKey)[16][48];
class _declspec(dllexport) Des
{
public:
Des();
~Des();
//! Type—ENCRYPT:加密,DECRYPT:解密
/*!
输出缓冲区(Out)的长度 >= ((datalen+7)/8)*8,即比datalen大的且是8的倍数的最小正整数
In 可以= Out,此时加/解密后将覆盖输入缓冲区(In)的内容
当keylen>8时系统自动使用3次DES加/解密,否则使用标准DES加/解密超过16字节后只取前16字节
@see bool Des_Go(char *Out,char *In,long datalen,const char *Key,int keylen,bool Type = ENCRYPT);
*/
bool Des_Go(char *Out,char *In,long datalen,const char *Key,int keylen,bool Type = ENCRYPT);
private:
/*! @brief 标准DES加/解密
@see static void DES(char Out[8], char In[8], const PSubKey pSubKey, bool Type);
*/
static void DES(char Out[8], char In[8], const PSubKey pSubKey, bool Type);//标准DES加/解密
/*! @brief 设置密钥
@see static void SetKey(const char* Key, int len);
*/
static void SetKey(const char* Key, int len);// 设置密钥
/*! @brief 设置子密钥
@see static void SetSubKey(PSubKey pSubKey, const char Key[8]);
*/
static void SetSubKey(PSubKey pSubKey, const char Key[8]);// 设置子密钥
/*! @brief f 函数
@see static void F_func(bool In[32], const bool Ki[48]);
*/
static void F_func(bool In[32], const bool Ki[48]);// f 函数
/*! @brief S 盒代替
@see static void S_func(bool Out[32], const bool In[48]);
*/
static void S_func(bool Out[32], const bool In[48]);// S 盒代替
/*! @brief 变换
@see static void Transform(bool *Out, bool *In, const char *Table, int len);
*/
static void Transform(bool *Out, bool *In, const char *Table, int len);// 变换
/*! @brief 异或
@see static void Xor(bool *InA, const bool *InB, int len);
*/
static void Xor(bool *InA, const bool *InB, int len);// 异或
/*! @brief 循环左移
@see static void RotateL(bool *In, int len, int loop);
*/
static void RotateL(bool *In, int len, int loop);// 循环左移
/*! @brief 字节组转换成位组
@see static void ByteToBit(bool *Out, const char *In, int bits);
*/
static void ByteToBit(bool *Out, const char *In, int bits);// 字节组转换成位组
/*! @brief 位组转换成字节组
@see static void BitToByte(char *Out, const bool *In, int bits);
*/
static void BitToByte(char *Out, const bool *In, int bits);// 位组转换成字节组
};
//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
#endif
</div>
DES.cpp文件：
//////////////////////////////////////////////////////////////////////////
/*
Provided by 朱孟斌, National University Of Technology
Email: zmbtsubasa@gmailcom
This product is free for use
*/
//////////////////////////////////////////////////////////////////////////
#include "memoryh"
#include "Desh"
//////////////////////////////////////////////////////////////////////////
// initial permutation IP
const static char IP_Table[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
};
// final permutation IP^-1
const static char IPR_Table[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
};
// expansion operation matrix
static const char E_Table[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
};
// 32-bit permutation function P used on the output of the S-boxes
const static char P_Table[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
};
// permuted choice table (key)
const static char PC1_Table[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
};
// permuted choice key (table)
const static char PC2_Table[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
};
// number left rotations of pc1
const static char LOOP_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
// The (in)famous S-boxes
const static char S_Box[8][4][16] = {
// S1
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,
// S2
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,
// S3
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,
// S4
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,
// S5
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,
// S6
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,
// S7
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