冒死解密，微信逆向：破解聊天记录文件！
程序员的成长之路
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2021-07-18 16:48
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作者：newx
链接：https://bbs.pediy.com/thread-251303.htm
using namespace std;#include <Windows.h>#include <iostream>#include <openssl/rand.h>#include <openssl/evp.h>#include <openssl/aes.h>#include <openssl/hmac.h>#undef _UNICODE#define SQLITE_FILE_HEADER "SQLite format 3"#define IV_SIZE 16#define HMAC_SHA1_SIZE 20#define KEY_SIZE 32#define SL3SIGNLEN 20#ifndef ANDROID_WECHAT#define DEFAULT_PAGESIZE 4096 //4048数据 + 16IV + 20 HMAC + 12#define DEFAULT_ITER 64000#else#define NO_USE_HMAC_SHA1#define DEFAULT_PAGESIZE 1024#define DEFAULT_ITER 4000#endif//pc端密码是经过OllyDbg得到的32位pass。unsigned char pass[] = { 0x53,0xE9,0xBF,0xB2,0x3B,0x72,0x41,0x95,0xA2,0xBC,0x6E,0xB5,0xBF,0xEB,0x06,0x10,0xDC,0x21,0x64,0x75,0x6B,0x9B,0x42,0x79,0xBA,0x32,0x15,0x76,0x39,0xA4,0x0B,0xB1 };char dbfilename[50];int Decryptdb();int CheckKey();int CheckAESKey();int main(int argc, char* argv[]){if (argc >= 2) //第二个参数argv[1]是文件名strcpy_s(dbfilename, argv[1]); //复制//没有提供文件名，则提示用户输入else {cout << "请输入文件名:" << endl;cin >> dbfilename;}Decryptdb();return 0;}int Decryptdb(){FILE* fpdb;fopen_s(&fpdb, dbfilename, "rb+");if (!fpdb){printf("打开文件错!");getchar();return 0;}fseek(fpdb, 0, SEEK_END);long nFileSize = ftell(fpdb);fseek(fpdb, 0, SEEK_SET);unsigned char* pDbBuffer = new unsigned char[nFileSize];fread(pDbBuffer, 1, nFileSize, fpdb);fclose(fpdb);unsigned char salt[16] = { 0 };memcpy(salt, pDbBuffer, 16);#ifndef NO_USE_HMAC_SHA1unsigned char mac_salt[16] = { 0 };memcpy(mac_salt, salt, 16);for (int i = 0; i < sizeof(salt); i++){mac_salt[i] ^= 0x3a;}#endifint reserve = IV_SIZE; //校验码长度,PC端每4096字节有48字节#ifndef NO_USE_HMAC_SHA1reserve += HMAC_SHA1_SIZE;#endifreserve = ((reserve % AES_BLOCK_SIZE) == 0) ? reserve : ((reserve / AES_BLOCK_SIZE) + 1) * AES_BLOCK_SIZE;unsigned char key[KEY_SIZE] = { 0 };unsigned char mac_key[KEY_SIZE] = { 0 };OpenSSL_add_all_algorithms();PKCS5_PBKDF2_HMAC_SHA1((const char*)pass, sizeof(pass), salt, sizeof(salt), DEFAULT_ITER, sizeof(key), key);#ifndef NO_USE_HMAC_SHA1PKCS5_PBKDF2_HMAC_SHA1((const char*)key, sizeof(key), mac_salt, sizeof(mac_salt), 2, sizeof(mac_key), mac_key);#endifunsigned char* pTemp = pDbBuffer;unsigned char pDecryptPerPageBuffer[DEFAULT_PAGESIZE];int nPage = 1;int offset = 16;while (pTemp < pDbBuffer + nFileSize){printf("解密数据页:%d/%d \n", nPage, nFileSize / DEFAULT_PAGESIZE);#ifndef NO_USE_HMAC_SHA1unsigned char hash_mac[HMAC_SHA1_SIZE] = { 0 };unsigned int hash_len = 0;HMAC_CTX hctx;HMAC_CTX_init(&hctx);HMAC_Init_ex(&hctx, mac_key, sizeof(mac_key), EVP_sha1(), NULL);HMAC_Update(&hctx, pTemp + offset, DEFAULT_PAGESIZE - reserve - offset + IV_SIZE);HMAC_Update(&hctx, (const unsigned char*)& nPage, sizeof(nPage));HMAC_Final(&hctx, hash_mac, &hash_len);HMAC_CTX_cleanup(&hctx);if (0 != memcmp(hash_mac, pTemp + DEFAULT_PAGESIZE - reserve + IV_SIZE, sizeof(hash_mac))){printf("\n 哈希值错误! \n");getchar();return 0;}#endif//if (nPage == 1){memcpy(pDecryptPerPageBuffer, SQLITE_FILE_HEADER, offset);}EVP_CIPHER_CTX* ectx = EVP_CIPHER_CTX_new();EVP_CipherInit_ex(ectx, EVP_get_cipherbyname("aes-256-cbc"), NULL, NULL, NULL, 0);EVP_CIPHER_CTX_set_padding(ectx, 0);EVP_CipherInit_ex(ectx, NULL, NULL, key, pTemp + (DEFAULT_PAGESIZE - reserve), 0);int nDecryptLen = 0;int nTotal = 0;EVP_CipherUpdate(ectx, pDecryptPerPageBuffer + offset, &nDecryptLen, pTemp + offset, DEFAULT_PAGESIZE - reserve - offset);nTotal = nDecryptLen;EVP_CipherFinal_ex(ectx, pDecryptPerPageBuffer + offset + nDecryptLen, &nDecryptLen);nTotal += nDecryptLen;EVP_CIPHER_CTX_free(ectx);memcpy(pDecryptPerPageBuffer + DEFAULT_PAGESIZE - reserve, pTemp + DEFAULT_PAGESIZE - reserve, reserve);char decFile[1024] = { 0 };sprintf_s(decFile, "dec_%s", dbfilename);FILE * fp;fopen_s(&fp, decFile, "ab+");{fwrite(pDecryptPerPageBuffer, 1, DEFAULT_PAGESIZE, fp);fclose(fp);}nPage++;offset = 0;pTemp += DEFAULT_PAGESIZE;}printf("\n 解密成功! \n");return 0;}
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