原创 2022 KCTF 看雪学苑
出题团队简介
赛题设计思路
题目说明和答案在Duplicity题目说明.zip压缩包中：https://bbs.pediy.com/thread-272621.htm
题目设计说明
主要魔改点（其余异常处理用于反调试）：
破解思路
// 1k[42] = 0xD4AF3085;// 2void swap_aes_sbox() {inv_S[S[113]] ^= inv_S[S[163]];inv_S[S[163]] ^= inv_S[S[113]];inv_S[S[113]] ^= inv_S[S[163]];return;}int keyExpansion(const uint8_t *key, uint32_t keyLen, AesKey *aesKey) {uint32_t *w = aesKey->eK;uint32_t *v = aesKey->dK;/* W[0-3] */for (int i = 0; i < 4; ++i) {swap_aes_sbox();LOAD32H(w[i], key + 4*i);}/* W[4-43] */for (int i = 0; i < 10; ++i) {swap_aes_sbox();w[4] = w[0] ^ MIX(w[3]) ^ rcon[i];w[5] = w[1] ^ w[4];w[6] = w[2] ^ w[5];w[7] = w[3] ^ w[6];w += 4;}w = aesKey->eK+44 - 4;for (int j = 0; j < 11; ++j) {swap_aes_sbox();for (int i = 0; i < 4; ++i) {v[i] = w[i];}w -= 4;v += 4;}return 0;}// 3int invShiftRows(uint8_t (*state)[4]) {uint32_t block[4] = {0};for (int i = 0; i < 4; ++i) {LOAD32H(block[i], state[i]);block[i] = ROF32(block[i], 8*i);STORE32H(block[i], state[i]);}return 0;}// 4byte_41C200[16] = 244;byte_41C200[17] = 242;
flag
赛题解析
本赛题解析由看雪论坛专家 堂前燕 给出：
flag{db5c6a8dfec4d0ec5569899640}
魔改AES-128-ECB加密操作
S盒有变动
对应修改
static const int S[16][16] = {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, 0x0A, 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, 0xA3, 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 int S2[16][16]{0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0x71, 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, 0xA3, 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,};
m_shiftRows函数
对应修改shiftRows操作
AES加解密源码参考
aes.h
#pragma once#ifndef MY_AES_H#define MY_AES_H/*** 参数 p: 明文的字符串数组。* 参数 plen: 明文的长度,长度必须为16的倍数。* 参数 key: 密钥的字符串数组。*/void aes(char* p, int plen, char* key);/*** 参数 c: 密文的字符串数组。* 参数 clen: 密文的长度,长度必须为16的倍数。* 参数 key: 密钥的字符串数组。*/void deAes(char* c, int clen, char* key);void AES_EN_402070(char* key, size_t keylen, char* p, char* outdata, int plen);void AES_DE_402070(char* key, size_t keylen, char* c, char* outdata, int clen);#endif
aes.cpp
#include <stdio.h>#include <stdlib.h>#include <string.h>#include "aes.h"/*** S盒*///static const int S[16][16] = { 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 int S[16][16] = {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, 0x0A, 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, 0xA3, 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};/*** 逆S盒*///static const int S2[16][16] = { 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 int S2[16][16]{0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0x71, 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, 0xA3, 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,};/*** 获取整形数据的低8位的左4个位*/static int getLeft4Bit(int num) {int left = num & 0x000000f0;return left >> 4;}/*** 获取整形数据的低8位的右4个位*/static int getRight4Bit(int num) {return num & 0x0000000f;}/*** 根据索引，从S盒中获得元素*/static int getNumFromSBox(int index) {int row = getLeft4Bit(index);int col = getRight4Bit(index);return S[row][col];}/*** 把一个字符转变成整型*/static int getIntFromChar(char c) {int result = (int)c;return result & 0x000000ff;}/*** 把16个字符转变成4X4的数组，* 该矩阵中字节的排列顺序为从上到下，* 从左到右依次排列。*/static void convertToIntArray(char* str, int pa[4][4]) {int k = 0;int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++) {pa[j][i] = getIntFromChar(str[k]);k++;}}/*** 打印4X4的数组*/static void printArray(int a[4][4]) {int i, j;for (i = 0; i < 4; i++) {for (j = 0; j < 4; j++)printf("a[%d][%d] = 0x%x ", i, j, a[i][j]);printf("\n");}printf("\n");}/*** 打印字符串的ASSCI，* 以十六进制显示。*/static void printASSCI(char* str, int len) {int i;for (i = 0; i < len; i++)printf("0x%x ", getIntFromChar(str[i]));printf("\n");}/*** 把连续的4个字符合并成一个4字节的整型*/static int getWordFromStr(char* str) {int one, two, three, four;one = getIntFromChar(str[0]);one = one << 24;two = getIntFromChar(str[1]);two = two << 16;three = getIntFromChar(str[2]);three = three << 8;four = getIntFromChar(str[3]);return one | two | three | four;}/*** 把一个4字节的数的第一、二、三、四个字节取出，* 入进一个4个元素的整型数组里面。*/static void splitIntToArray(int num, int array[4]) {int one, two, three;one = num >> 24;array[0] = one & 0x000000ff;two = num >> 16;array[1] = two & 0x000000ff;three = num >> 8;array[2] = three & 0x000000ff;array[3] = num & 0x000000ff;}/*** 将数组中的元素循环左移step位*/static void leftLoop4int(int array[4], int step) {int temp[4];int i;int index;for (i = 0; i < 4; i++)temp[i] = array[i];index = step % 4 == 0 ? 0 : step % 4;for (i = 0; i < 4; i++) {array[i] = temp[index];index++;index = index % 4;}}/*** 把数组中的第一、二、三和四元素分别作为* 4字节整型的第一、二、三和四字节，合并成一个4字节整型*/static int mergeArrayToInt(int array[4]) {int one = array[0] << 24;int two = array[1] << 16;int three = array[2] << 8;int four = array[3];return one | two | three | four;}/*** 常量轮值表*/static const int Rcon[10] = { 0x01000000, 0x02000000,0x04000000, 0x08000000,0x10000000, 0x20000000,0x40000000, 0x80000000,0x1b000000, 0x36000000 };/*** 密钥扩展中的T函数*/static int T(int num, int round) {int numArray[4];int i;int result;splitIntToArray(num, numArray);leftLoop4int(numArray, 1);//字循环//字节代换for (i = 0; i < 4; i++)numArray[i] = getNumFromSBox(numArray[i]);result = mergeArrayToInt(numArray);return result ^ Rcon[round];}//密钥对应的扩展数组static int w[44];/*** 打印W数组*/static void printW() {int i, j;for (i = 0, j = 1; i < 44; i++, j++) {printf("w[%d] = 0x%x ", i, w[i]);if (j % 4 == 0)printf("\n");}printf("\n");}/*** 扩展密钥，结果是把w[44]中的每个元素初始化*/static void extendKey(char* key) {int i, j;for (i = 0; i < 4; i++)w[i] = getWordFromStr(key + i * 4);for (i = 4, j = 0; i < 44; i++) {if (i % 4 == 0) {w[i] = w[i - 4] ^ T(w[i - 1], j);j++;//下一轮}else {w[i] = w[i - 4] ^ w[i - 1];}}}/*** 轮密钥加*/static void addRoundKey(int array[4][4], int round) {int warray[4];int i, j;for (i = 0; i < 4; i++) {splitIntToArray(w[round * 4 + i], warray);for (j = 0; j < 4; j++) {array[j][i] = array[j][i] ^ warray[j];}}}/*** 字节代换*/static void subBytes(int array[4][4]) {int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++)array[i][j] = getNumFromSBox(array[i][j]);}/*** 行移位*/static void shiftRows(int array[4][4]) {int rowTwo[4], rowThree[4], rowFour[4];int i;for (i = 0; i < 4; i++) {rowTwo[i] = array[1][i];rowThree[i] = array[2][i];rowFour[i] = array[3][i];}/*leftLoop4int(rowTwo, 1);leftLoop4int(rowThree, 2);leftLoop4int(rowFour, 3);*/leftLoop4int(rowTwo, 3);leftLoop4int(rowThree, 2);leftLoop4int(rowFour, 1);for (i = 0; i < 4; i++) {array[1][i] = rowTwo[i];array[2][i] = rowThree[i];array[3][i] = rowFour[i];}}/*** 列混合要用到的矩阵*/static const int colM[4][4] = { 2, 3, 1, 1,1, 2, 3, 1,1, 1, 2, 3,3, 1, 1, 2 };static int GFMul2(int s) {int result = s << 1;int a7 = result & 0x00000100;if (a7 != 0) {result = result & 0x000000ff;result = result ^ 0x1b;}return result;}static int GFMul3(int s) {return GFMul2(s) ^ s;}static int GFMul4(int s) {return GFMul2(GFMul2(s));}static int GFMul8(int s) {return GFMul2(GFMul4(s));}static int GFMul9(int s) {return GFMul8(s) ^ s;}static int GFMul11(int s) {return GFMul9(s) ^ GFMul2(s);}static int GFMul12(int s) {return GFMul8(s) ^ GFMul4(s);}static int GFMul13(int s) {return GFMul12(s) ^ s;}static int GFMul14(int s) {return GFMul12(s) ^ GFMul2(s);}/*** GF上的二元运算*/static int GFMul(int n, int s) {int result;if (n == 1)result = s;else if (n == 2)result = GFMul2(s);else if (n == 3)result = GFMul3(s);else if (n == 0x9)result = GFMul9(s);else if (n == 0xb)//11result = GFMul11(s);else if (n == 0xd)//13result = GFMul13(s);else if (n == 0xe)//14result = GFMul14(s);return result;}/*** 列混合*/static void mixColumns(int array[4][4]) {int tempArray[4][4];int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++)tempArray[i][j] = array[i][j];for (i = 0; i < 4; i++)for (j = 0; j < 4; j++) {array[i][j] = GFMul(colM[i][0], tempArray[0][j]) ^ GFMul(colM[i][1], tempArray[1][j])^ GFMul(colM[i][2], tempArray[2][j]) ^ GFMul(colM[i][3], tempArray[3][j]);}}/*** 把4X4数组转回字符串*/static void convertArrayToStr(int array[4][4], char* str) {int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++)*str++ = (char)array[j][i];}/*** 检查密钥长度*/static int checkKeyLen(int len) {if (len == 16)return 1;elsereturn 0;}void AES_EN_402070(char* key, size_t keylen, char* p, char* outdata, int plen) {//int keylen = strlen(key);int pArray[4][4];int k, i;if (plen == 0 || plen % 16 != 0) {printf("明文字符长度必须为16的倍数！\n");exit(0);}if (!checkKeyLen(keylen)) {printf("密钥字符长度错误！长度必须为16。当前长度为%d\n", keylen);exit(0);}extendKey(key);//扩展密钥for (k = 0; k < plen; k += 16) {convertToIntArray(p + k, pArray);addRoundKey(pArray, 0);//一开始的轮密钥加for (i = 1; i < 10; i++) {subBytes(pArray);//字节代换shiftRows(pArray);//行移位mixColumns(pArray);//列混合addRoundKey(pArray, i);}subBytes(pArray);//字节代换shiftRows(pArray);//行移位addRoundKey(pArray, 10);convertArrayToStr(pArray, outdata + k);}}/*** 参数 p: 明文的字符串数组。* 参数 plen: 明文的长度。* 参数 key: 密钥的字符串数组。*/void aes(char* p, int plen, char* key) {int keylen = strlen(key);int pArray[4][4];int k, i;if (plen == 0 || plen % 16 != 0) {printf("明文字符长度必须为16的倍数！\n");exit(0);}if (!checkKeyLen(keylen)) {printf("密钥字符长度错误！长度必须为16。当前长度为%d\n", keylen);exit(0);}extendKey(key);//扩展密钥for (k = 0; k < plen; k += 16) {convertToIntArray(p + k, pArray);addRoundKey(pArray, 0);//一开始的轮密钥加for (i = 1; i < 10; i++) {subBytes(pArray);//字节代换shiftRows(pArray);//行移位mixColumns(pArray);//列混合addRoundKey(pArray, i);}subBytes(pArray);//字节代换shiftRows(pArray);//行移位addRoundKey(pArray, 10);convertArrayToStr(pArray, p + k);}}/*** 根据索引从逆S盒中获取值*/static int getNumFromS1Box(int index) {int row = getLeft4Bit(index);int col = getRight4Bit(index);return S2[row][col];}/*** 逆字节变换*/static void deSubBytes(int array[4][4]) {int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++)array[i][j] = getNumFromS1Box(array[i][j]);}/*** 把4个元素的数组循环右移step位*/static void rightLoop4int(int array[4], int step) {int temp[4];int i;int index;for (i = 0; i < 4; i++)temp[i] = array[i];index = step % 4 == 0 ? 0 : step % 4;index = 3 - index;for (i = 3; i >= 0; i--) {array[i] = temp[index];index--;index = index == -1 ? 3 : index;}}/*** 逆行移位*/static void deShiftRows(int array[4][4]) {int rowTwo[4], rowThree[4], rowFour[4];int i;for (i = 0; i < 4; i++) {rowTwo[i] = array[1][i];rowThree[i] = array[2][i];rowFour[i] = array[3][i];}/*rightLoop4int(rowTwo, 1);rightLoop4int(rowThree, 2);rightLoop4int(rowFour, 3);*/rightLoop4int(rowTwo, 3);rightLoop4int(rowThree, 2);rightLoop4int(rowFour, 1);for (i = 0; i < 4; i++) {array[1][i] = rowTwo[i];array[2][i] = rowThree[i];array[3][i] = rowFour[i];}}/*** 逆列混合用到的矩阵*/static const int deColM[4][4] = { 0xe, 0xb, 0xd, 0x9,0x9, 0xe, 0xb, 0xd,0xd, 0x9, 0xe, 0xb,0xb, 0xd, 0x9, 0xe };/*** 逆列混合*/static void deMixColumns(int array[4][4]) {int tempArray[4][4];int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++)tempArray[i][j] = array[i][j];for (i = 0; i < 4; i++)for (j = 0; j < 4; j++) {array[i][j] = GFMul(deColM[i][0], tempArray[0][j]) ^ GFMul(deColM[i][1], tempArray[1][j])^ GFMul(deColM[i][2], tempArray[2][j]) ^ GFMul(deColM[i][3], tempArray[3][j]);}}/*** 把两个4X4数组进行异或*/static void addRoundTowArray(int aArray[4][4], int bArray[4][4]) {int i, j;for (i = 0; i < 4; i++)for (j = 0; j < 4; j++)aArray[i][j] = aArray[i][j] ^ bArray[i][j];}/*** 从4个32位的密钥字中获得4X4数组，* 用于进行逆列混合*/static void getArrayFrom4W(int i, int array[4][4]) {int index, j;int colOne[4], colTwo[4], colThree[4], colFour[4];index = i * 4;splitIntToArray(w[index], colOne);splitIntToArray(w[index + 1], colTwo);splitIntToArray(w[index + 2], colThree);splitIntToArray(w[index + 3], colFour);for (j = 0; j < 4; j++) {array[j][0] = colOne[j];array[j][1] = colTwo[j];array[j][2] = colThree[j];array[j][3] = colFour[j];}}void AES_DE_402070(char* key, size_t keylen, char* c, char* outdata, int clen) {//(char* c, int clen, char* key)//(char* p, int plen, char* key)int cArray[4][4];int k;// int keylen, k;//keylen = strlen(key);if (clen == 0 || clen % 16 != 0) {printf("密文字符长度必须为16的倍数！现在的长度为%d\n", clen);exit(0);}if (!checkKeyLen(keylen)) {printf("密钥字符长度错误！长度必须为16、24和32。当前长度为%d\n", keylen);exit(0);}extendKey(key);//扩展密钥for (k = 0; k < clen; k += 16) {int i;int wArray[4][4];convertToIntArray(c + k, cArray);addRoundKey(cArray, 10);for (i = 9; i >= 1; i--) {deSubBytes(cArray);deShiftRows(cArray);deMixColumns(cArray);getArrayFrom4W(i, wArray);deMixColumns(wArray);addRoundTowArray(cArray, wArray);}deSubBytes(cArray);deShiftRows(cArray);addRoundKey(cArray, 0);convertArrayToStr(cArray, outdata + k);}}/*** 参数 c: 密文的字符串数组。* 参数 clen: 密文的长度。* 参数 key: 密钥的字符串数组。*/void deAes(char* c, int clen, char* key) {int cArray[4][4];int keylen, k;keylen = strlen(key);if (clen == 0 || clen % 16 != 0) {printf("密文字符长度必须为16的倍数！现在的长度为%d\n", clen);exit(0);}if (!checkKeyLen(keylen)) {printf("密钥字符长度错误！长度必须为16、24和32。当前长度为%d\n", keylen);exit(0);}extendKey(key);//扩展密钥for (k = 0; k < clen; k += 16) {int i;int wArray[4][4];convertToIntArray(c + k, cArray);addRoundKey(cArray, 10);for (i = 9; i >= 1; i--) {deSubBytes(cArray);deShiftRows(cArray);deMixColumns(cArray);getArrayFrom4W(i, wArray);deMixColumns(wArray);addRoundTowArray(cArray, wArray);}deSubBytes(cArray);deShiftRows(cArray);addRoundKey(cArray, 0);convertArrayToStr(cArray, c + k);}}
test
#include <iostream>#include "aes.h"int main(){char target[] = { 0x57, 0x7C, 0xF5, 0x6D, 0x56, 0x96, 0x77, 0x45, 0xB0, 0xBD, 0xA1, 0xC7, 0x89, 0xA5, 0xAB, 0xDC,0xF4, 0xF2, 0x4B, 0xFE, 0xBE, 0xF5, 0xF5, 0x5C, 0x4D, 0x30, 0x42, 0x0F, 0x2B, 0x3B, 0xE6, 0xCB };char key[] = {0x2F, 0x65, 0xB1, 0xFF, 0x31, 0xED, 0x86, 0xD0, 0x9A, 0x28, 0x5C, 0x0F, 0x40, 0x48, 0x05, 0x9D};char flag[33] = { 0 };AES_DE_402070(key, 16, target, flag, 32);for (int i = 0; i < 32; ++i) {printf("%02x ", (unsigned char)flag[i]);if (!((i + 1) % 16)) {printf("\n");}}printf("\n");printf("%s\n", flag);return 0;}
第四题《飞蛾扑火》还在火热进行中，
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