des.rar_授权

#include "memory.h" #include "stdio.h" enum {ENCRYPT,DECRYPT};// ENCRYPT:加密,DECRYPT:解密 void Des_Run(char Out[8], char In[8], bool Type=ENCRYPT); // 设置密钥 void Des_SetKey(const char Key[8]); static void F_func(bool In[32], const bool Ki[48]);// f 函数 static void S_func(bool Out[32], const bool In[48]);// S 盒代替 // 变换 static void Transform(bool *Out, bool *In, const char *Table, int len); static void Xor(bool *InA, const bool *InB, int len);// 异或 static void RotateL(bool *In, int len, int loop);// 循环左移 // 字节组转换成位组 static void ByteToBit(bool *Out, const char *In, int bits); // 位组转换成字节组 static void BitToByte(char *Out, const bool *In, int bits); //置换IP表 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 }; //逆置换IP-1表 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 }; //E位选择表 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 }; //P换位表 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 }; //PC1选位表 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 }; //PC2选位表 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 }; //左移位数表 const static char LOOP_Table[16] = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1 }; // S盒 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 }; static bool SubKey[16][48];// 16圈子密钥 void Des_Run(char Out[8], char In[8], 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, SubKey[i]); Xor(Ri, Li, 32); memcpy(Li, Tmp, 32); } }else{ for(int i=15; i>=0; i--) { memcpy(Tmp, Li, 32); F_func(Li, SubKey[i]); Xor(Li, Ri, 32); memcpy(Ri, Tmp, 32); } } Transform(M, M, IPR_Table, 64); BitToByte(Out, M, 64); } void Des_SetKey(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(SubKey[i], K, PC2_Table, 48); } } void 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 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 Transform(bool *Out, bool *In, const char *Table, int len) { static bool Tmp[256]; for(int i=0; i<len; i++) Tmp[i] = In[ Table[i]-1 ]; memcpy(Out, Tmp, len); } void Xor(bool *InA, const bool *InB, int len) { for(int i=0; i<len; i++) InA[i] ^= InB[i]; } void RotateL(bool *In, int len, int loop) { static bool Tmp[256]; memcpy(Tmp, In, loop); memcpy(In, In+loop, len-loop); memcpy(In+len-loop, Tmp, loop); } void ByteToBit(bool *Out, const char *In, int bits) { for(int i=0; i<bits; i++) Out[i] = (In[i/8]>>(i%8)) & 1; } void BitToByte(char *Out, const bool *In, int bits) { memset(Out, 0, (bits+7)/8); for(int i=0; i<bits; i++) Out[i/8] |= In[i]<<(i%8); } void main() { char key[8]={1,9,8,0,9,1,7,2},str[]="Hello"; puts("Before encrypting"); puts(str); Des_SetKey(key); Des_Run(str, str, ENCRYPT); puts("After encrypting"); puts(str); puts("After decrypting"); Des_Run(str, str, DECRYPT); puts(str); }