以下是一个使用C语言实现AES加密解密的代码。代码包含了明确的一轮四个模块，文件读取明文并进行分组填充，列混合实现矩阵乘法运算，有限域上的快速模乘，逆向过程与正向过程相似，且只进行一次加密解密。 ```c #include <stdio.h> #include <stdint.h> typedef uint8_t state_t[4][4]; static const uint8_t sbox[256] = { // s-box 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }; static const uint8_t inv_sbox[256] = { // inverse s-box 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d }; static const uint8_t Rcon[11] = { // round constants used in key expansion 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 }; // Multiplication in the Galois Field static uint8_t gmul(uint8_t a, uint8_t b) { uint8_t p = 0; while (b) { if (b & 1) p ^= a; if (a & 0x80) a = (a << 1) ^ 0x1b; else a <<= 1; b >>= 1; } return p; } // SubBytes transformation static void sub_bytes(state_t state) { for (int i = 0; i < 4; ++i) { for (int j = 0; j < 4; ++j) { state[i][j] = sbox[state[i][j]]; } } } // ShiftRows transformation static void shift_rows(state_t state) { uint8_t temp; // Rotate first row 1 column to the left temp = state[1][0]; state[1][0] = state[1][1]; state[1][1] = state[1][2]; state[1][2] = state[1][3]; state[1][3] = temp; // Rotate second row 2 column to the left temp = state[2][0]; state[2][0] = state[2][2]; state[2][2] = temp; temp = state[2][1]; state[2][1] = state[2][3]; state[2][3] = temp; // Rotate third row 3 column to the left temp = state[3][0]; state[3][0] = state[3][3]; state[3][3] = state[3][2]; state[3][2] = state[3][1]; state[3][1] = temp; } // MixColumns transformation static void mix_columns(state_t state) { uint8_t s[4], s1, s2, s3; for (int i = 0; i < 4; ++i) { s[0] = state[0][i]; s[1] = state[1][i]; s[2] = state[2][i]; s[3] = state[3][i]; s1 = gmul(0x02, s[0]) ^ gmul(0x03, s[1]) ^ s[2] ^ s[3]; s2 = s[0] ^ gmul(0x02, s[1]) ^ gmul(0x03, s[2]) ^ s[3]; s3 = s[0] ^ s[1] ^ gmul(0x02, s[2]) ^ gmul(0x03, s[3]); state[0][i] = s1; state[1][i] = s2; state[2][i] = s3; state[3][i] = gmul(0x03, s[0]) ^ s[1] ^ s[2] ^ gmul(0x02, s[3]); } } // AddRoundKey transformation static void add_round_key(state_t state, const uint8_t *key_schedule) { for (int i = 0; i < 4; ++i) { for (int j = 0; j < 4; ++j) { state[j][i] ^= key_schedule[i * 4 + j]; } } } // KeyExpansion - generates the round keys static void key_expansion(const uint8_t *key, uint8_t *key_schedule) { for (int i = 0; i < 16; ++i) { key_schedule[i] = key[i]; } uint8_t temp[4]; int iteration = 1; int rcon_index = 1; int key_schedule_index = 16; while (key_schedule_index < 176) { // Copy the previous 4 bytes to the temporary array for (int i = 0; i < 4; ++i) { temp[i] = key_schedule[(key_schedule_index - 4) + i]; } // Perform the key schedule core once every 16 iterations if (key_schedule_index % 16 == 0) { // Rotate the 4 bytes in temp uint8_t temp_byte = temp[0]; temp[0] = temp[1]; temp[1] = temp[2]; temp[2] = temp[3]; temp[3] = temp_byte; // Substitute the bytes using the S-box for (int i = 0; i < 4; ++i) { temp[i] = sbox[temp[i]]; } // XOR the first byte with the Rcon value for the current iteration temp[0] ^= Rcon[rcon_index++]; [2024-12-01 22:10:00 | AI写代码神器 | 4618点数解答]