四种加密算法之DES源代码-C++

转载：http://blog.csdn.net/zmb2011/article/details/6842135

DES.h文件：

 //
 /*
     Provided by 朱孟斌, National University Of Technology
     Email: [email protected]
     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

DES.cpp文件：

 //
 /*
     Provided by 朱孟斌, National University Of Technology
     Email: [email protected]
     This product is free for use.
 */
 //

 #include "memory.h"
 #include "Des.h"

 //

 // 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,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12,
     // S8
     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
 };

 //
 // Code starts:
 //
 Des::Des()
 {

 }
 Des::~Des()
 {

 }
 bool Des::Des_Go(char *Out, char *In, long datalen, const char *Key, int keylen, bool Type)
 {
     if( !( Out && In && Key && (datalen=(datalen+7)&0xfffffff8) ) )
         return false;
     SetKey(Key, keylen);
     if( !Is3DES ) {   // 1次DES
         for(long i=0,j=datalen>>3; i
             DES(Out, In, &SubKey[0], Type);
     } else{   // 3次DES 加密:加(key0)-解(key1)-加(key0) 解密::解(key0)-加(key1)-解(key0)
         for(long i=0,j=datalen>>3; i
             DES(Out, In,  &SubKey[0], Type);
             DES(Out, Out, &SubKey[1], !Type);
             DES(Out, Out, &SubKey[0], Type);
         }
     }
     return true;
 }
 void Des::SetKey(const char* Key, int len)
 {
     memset(deskey, 0, 16);
     memcpy(deskey, Key, len>16?16:len);
     SetSubKey(&SubKey[0], &deskey[0]);
     Is3DES = len>8 ? (SetSubKey(&SubKey[1], &deskey[8]), true) : false;
 }
 void Des::DES(char Out[8], char In[8], const PSubKey pSubKey, bool Type)
 {
     static bool M[64], tmp[32], *Li=&M[0], *Ri=&M[32];
     ByteToBit(M, In, 64);
     Transform(M, M, IP_Table, 64);
     if( Type == ENCRYPT ){
         for(int i=0; i<16; ++i) {
             memcpy(tmp, Ri, 32);
             F_func(Ri, (*pSubKey)[i]);
             Xor(Ri, Li, 32);
             memcpy(Li, tmp, 32);
         }
     }else{
         for(int i=15; i>=0; --i) {
             memcpy(tmp, Li, 32);
             F_func(Li, (*pSubKey)[i]);
             Xor(Li, Ri, 32);
             memcpy(Ri, tmp, 32);
         }
     }
     Transform(M, M, IPR_Table, 64);
     BitToByte(Out, M, 64);
 }
 void Des::SetSubKey(PSubKey pSubKey, const char Key[8])
 {
     static bool K[64], *KL=&K[0], *KR=&K[28];
     ByteToBit(K, Key, 64);
     Transform(K, K, PC1_Table, 56);
     for(int i=0; i<16; ++i) {
         RotateL(KL, 28, LOOP_Table[i]);
         RotateL(KR, 28, LOOP_Table[i]);
         Transform((*pSubKey)[i], K, PC2_Table, 48);
     }
 }
 void Des::F_func(bool In[32], const bool Ki[48])
 {
     static bool MR[48];
     Transform(MR, In, E_Table, 48);
     Xor(MR, Ki, 48);
     S_func(In, MR);
     Transform(In, In, P_Table, 32);
 }
 void Des::S_func(bool Out[32], const bool In[48])
 {
     for(char i=0,j,k; i<8; ++i,In+=6,Out+=4) {
         j = (In[0]<<1) + In[5];
         k = (In[1]<<3) + (In[2]<<2) + (In[3]<<1) + In[4];
         ByteToBit(Out, &S_Box[i][j][k], 4);
     }
 }
 void Des::Transform(bool *Out, bool *In, const char *Table, int len)
 {
     for(int i=0; i
         Tmp[i] = In[ Table[i]-1 ];
     memcpy(Out, Tmp, len);
 }
 void Des::Xor(bool *InA, const bool *InB, int len)
 {
     for(int i=0; i
         InA[i] ^= InB[i];
 }
 void Des::RotateL(bool *In, int len, int loop)
 {
     memcpy(Tmp, In, loop);
     memcpy(In, In+loop, len-loop);
     memcpy(In+len-loop, Tmp, loop);
 }
 void Des::ByteToBit(bool *Out, const char *In, int bits)
 {
     for(int i=0; i
         Out[i] = (In[i>>3]>>(i&7)) & 1;
 }
 void Des::BitToByte(char *Out, const bool *In, int bits)
 {
     memset(Out, 0, bits>>3);
     for(int i=0; i
         Out[i>>3] |= In[i]<<(i&7);
 }
 //
 // Code ends.
 //