#include stdio.h#include stdlib.htypedef unsigned char Byte;typedef unsigned long long Bytes;// 为Bytes定义Permutate函数Bytes PermutateBytes(Bytes a, const int b[], int m, int n) {Bytes c 0;for (int i 0; i n; i) {c (c 1) | ((a (m - b[i] - 1)) 1);}return c;}// 为Byte定义Permutate函数Byte PermutateByte(Byte a, const Byte b[], int m, int n) {Byte c 0;for (int i 0; i n; i) {c (c 1) | ((a (m - b[i] - 1)) 1);}return c;}// 交换两个Bytes类型的值void swap(Bytes *a, Bytes *b) {Bytes temp *a;*a *b;*b temp;}Bytes IP(Bytes a) {static int ip[64] {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, 7,56, 48, 40, 32, 24, 16, 8, 0,58, 50, 42, 34, 26, 18, 10, 2,60, 52, 44, 36, 28, 20, 12, 4,62, 54, 46, 38, 30, 22, 14, 6};return PermutateBytes(a, ip, 64, 64);}Bytes FP(Bytes a) {static int fp[64] {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, 25,32, 0, 40, 8, 48, 16, 56, 24};return PermutateBytes(a, fp, 64, 64);}Bytes PC1(Bytes key) {static int pc1_l[28] {56, 48, 40, 32, 24, 16, 8, 0,57, 49, 41, 33, 25, 17, 9, 1,58, 50, 42, 34, 26, 18, 10, 2,59, 51, 43, 35};static int pc1_r[28] {62, 54, 46, 38, 30, 22, 14, 6,61, 53, 45, 37, 29, 21, 13, 5,60, 52, 44, 36, 28, 20, 12, 4,27, 19, 11, 3};return (PermutateBytes(key, pc1_l, 64, 28) 28) | PermutateBytes(key, pc1_r, 64, 28);}Bytes PC2(Bytes key) {static int pc2[48] {13, 16, 10, 23, 0, 4, 2, 27,14, 5, 20, 9, 22, 18, 11, 3,25, 7, 15, 6, 26, 19, 12, 1,40, 51, 30, 36, 46, 54, 29, 39,50, 44, 32, 47, 43, 48, 38, 55,33, 52, 45, 41, 49, 35, 28, 31};return PermutateBytes(key, pc2, 56, 48);}Bytes Rotate(Bytes a, int n) {for (int i 0; i n; i)a (a 1 | (a 27 1)) ((1 28) - 1);return a;}void Keygen(Bytes key, Bytes keys[]) {key PC1(key);Bytes l key 28;Bytes r key ^ (l 28);int offset[16] {1, 1, 2, 2, 2, 2, 2, 2,1, 2, 2, 2, 2, 2, 2, 1};for (int i 0; i 16; i) {l Rotate(l, offset[i]);r Rotate(r, offset[i]);keys[i] PC2((l 28) | r);}}Bytes S(Bytes a) {static Byte s_box[8][64] {{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}, {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}, {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}, {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}, {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}, {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}, {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}, {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}};Bytes res 0;static Byte p[6] {0, 5, 1, 2, 3, 4};for (int i 0; i 8; i) {Byte b (a ((7 - i) * 6)) ((1 6) - 1);b PermutateByte(b, p, 6, 6);res (res 4) | s_box[i][b];}return res;}Bytes P(Bytes a) {static int p[32] {15, 6, 19, 20, 28, 11, 27, 16,0, 14, 22, 25, 4, 17, 30, 9,1, 7, 23, 13, 31, 26, 2, 8,18, 12, 29, 5, 21, 10, 3, 24};return PermutateBytes(a, p, 32, 32);}Bytes Expand(Bytes a) {static int e[48] {31, 0, 1, 2, 3, 4, 3, 4,5, 6, 7, 8, 7, 8, 9, 10,11, 12, 11, 12, 13, 14, 15, 16,15, 16, 17, 18, 19, 20, 19, 20,21, 22, 23, 24, 23, 24, 25, 26,27, 28, 27, 28, 29, 30, 31, 0};return PermutateBytes(a, e, 32, 48);}Bytes Round(Bytes a, Bytes subkey) {Bytes t Expand(a) ^ subkey;t S(t);t P(t);return t;}Bytes Feistel(Bytes a, Bytes subkey) {Bytes l a 32;Bytes r a ^ (l 32);return (r 32) | (l ^ Round(r, subkey));}Bytes DES(Bytes m, Bytes key, int decrypt, int round) {Bytes keys[16] {0};Keygen(key, keys);if (decrypt) {for (int i 0; i 8; i)swap(keys[i], keys[15 - i]);}Bytes c IP(m);for (int i 0; i round; i)c Feistel(c, keys[i]);Bytes l c 32;Bytes r c ^ (l 32);return FP((r 32) | l);}Bytes Encrypt(Bytes m, int round) {return DES(m, 0xcafababedeadbeafULL, 0, round);}void test() {printf(Test rotate: );if (Rotate(167772165, 2) 134217750) {printf(OK.\n);} else {printf(GG!\n);}printf(Test IP: );if (IP(81985529216486895ULL) 14699974583363760298ULL) {printf(OK.\n);} else {printf(GG!\n);}printf(Test PC1: );if (PC1(1383827165325090801ULL) 67779029043144591ULL) {printf(OK.\n);} else {printf(GG!\n);}printf(Test keygen: );Bytes keys[16] {0};Keygen(1383827165325090801ULL, keys);if (keys[15] 223465186400245ULL) {printf(OK.\n);} else {printf(GG!\n);}printf(Test S box: );if (S(178261171038007ULL) 3725222752ULL) {printf(OK.\n);} else {printf(GG!\n);}printf(Test round: );if (Round(3707429454ULL, 141493528337059ULL) 3207079049ULL) {printf(OK.\n);} else {printf(GG!\n);}}int main() {test();Bytes m 0x0123456789ABCDEF;Bytes k 0x133457799BBCDFF1;// 生成轮密钥Bytes round_keys[16];Keygen(k, round_keys);// 执行加密过程并输出每一轮的加密结果和轮密钥Bytes d m;printf(Round 0 - Input: %016llx\n, d);for (int i 0; i 16; i) {d DES(d, round_keys[i], 0, i 1);printf(Round %d - Output: %016llx, Round Key: %016llx\n, i 1, d, round_keys[i]);}Bytes c DES(m, k, 0, 16);printf(%016llx\n, c);printf(%016llx\n, DES(c, k, 1, 16));return 0;}简单转换为Python了但是本质上还是C语言的思维在发挥作用。