DES encryption and decryption
# include "memory.h" # include "stdio.h" # include "conio.h" enum {ENCRYPT,DECRYPT}; / / ENCRYPT: encryption, DECRYPT: decryption void Des_Run (char Out [8], char In [8], bool Type=ENCRYPT); void Des_SetKey (const char Key [8]); / / set key static void F_func (bool In [32], const bool Ki [48]); / / f function static void S_func (bool Out [32], const bool In [48]) / S boxes replace static void Transform (bool * Out, bool * In, const char * Table, int len); / / transform static void Xor (bool * InA, const bool * InB, int len); / / XOR static void RotateL (bool * In, int len, int loop); / / cycle left static void ByteToBit (bool * Out, const char * In, int bits); / / convert byte groups to bit groups static void BitToByte (char * Out, const bool * In, int bits) // 位组转换成字节组//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-bit selection table (extended permutation table) static const char E_Table [48] = {32 pence 1, 2 pyrrors, 3 bees, 4 bees, 4 bees, 5 bees, 6 bees, 7 bees, 8 beers, 9, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 9, 10, 12, 12, 13, 14, 14, 14, 14, 14, 14, 16, 18, 19, 19, 19, 19, 19, 21, 21, 21, 24, 25, 24, 26, 26, 26, 27, 26, 27, 28, 28, 29, 29, 28, 29, 29, 29, 29, 29, 29, and 29, respectively. / P transposition table (simple transposition table) const static char P_Table [32] = {167remiere, 202pics, 21pics, 2929, 12271, 1526, 5, 18, and 10, 8pics, 181, 10, 2, 8, and 8, the other two, two, eight, and the other. / / PC1 selection table (key generation replacement table 1) const static char PC1_Table [56] = {57pyrus 49pyrus 41pyrrh 53pje 17pjor9 const static char PC2_Table (key generation replacement table 1) const static char PC1_Table [56] = {57pyrus 49pyrus 41pyrus 31pyrus 31pyrus 31pyrus 22,14authorer61pr 545pr 31pr 310pr 2pjr 22pr 2pjjjjjj213pr 213pr 52pr 2pr 2pr 2pr 22pr 5340g 540g 54g pr, g / PC2 [48] = {{1417111pr change table] / / / / left shift table const static char LOOP_Table [16] = {1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1. / / S box const static char S_Box [8] [4] [16] = {/ / S box const static char S_Box [8] [4] [16] = {/ / S1 14pyrus 4PME [8] [4] [16] = {/ / S box 14pyrus [8] [4] [16] = {/ / S _ 1 14PM [8] [4] [16] = {# # * * $$} 8 / S 1 14 14 pens [8] [4] [4] [16] = {/ / S 1 14 14, 11, 11, 11, 10, 10, 10, 11, 11, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 12, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 5, 10, 5, 5, 5, 10, 5, 5, 5, 15, 12, 12, 15, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, and, 15, 12, 12, 12, 12, 12, 12, 12, 12, 14, 14, 10, 10, 10, 10, 5, 10, 5, 5, 5, 10, 5, 5, 5, 5, 5, and, for example, 10, 5, 5, 5, 5, 10, 5, 5, 5, 5, 5, 8, 15, 12, 1, 4, 1, 4, 1, 4, 1, 4, 4, 8, 4, 1, 4, 8, 4 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 Circle key 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); / / byte group converted to bit group Transform (M, M, IP_Table, 64) / / transform if (Type = = ENCRYPT) {for (int iTuno; iMel -) {memcpy (Tmp, Li, 32); F_func (Li, SubKey [I]); Xor (Li, Ri, 32); / / XOR memcpy (Ri, Tmp, 32);}} Transform (M, M, IPR_Table, 64) / transform 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); / / convert byte groups to byte Transform (K, K, PC1_Table, 56); / / transform for (int item0; I)
