一种简单的table异或加密算法

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一种简单的table异或加密算法
const char* str =  "AA479BC8-02FB-4B64-BE5C-6105F0789668";//keyvoid SetTable(byte* dst, int len){memset(dst, 0, len);int i = 0;while (i<len){dst[i] = i;i++;}byte v3 = 0;int index = 0;int a2 = strlen(str);byte v6;//置换do{v3 = (v3 + *(byte *)(index % a2 + str) + *(byte *)(index + dst)) % 256;v6 = *(byte*)(index + dst);*(byte *)(index++ + dst) = *(byte *)(v3 + dst);*(byte *)(v3 + dst) = v6;}while ( index < 256 );return ;}void decrypt_bytes(char* src, int src_len, char * dst, int dst_len){if (dst_len<src_len){return;}byte* table = new byte[0x100];if (!table){return ;}SetTable(table, 0x100);int bytes_len = src_len;int index = 0;byte* table_p;int base = 0;int i = 0;byte byte_t;do{//表置换index = (index + 1) % 256;table_p = (table + (base + table[index]) % 256);base = (base + table[index]) % 256;byte_t = table[index];table[index] = *table_p;*table_p = byte_t;//XOR加密dst[i] = src[i] ^ *((byte *)table + (table[index]+byte_t) % 256);i++;--bytes_len;}while ( bytes_len );delete[] table;return ;}bool crypt_file(const char* file_path){HANDLE hFile = CreateFileA(file_path, GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);if (hFile == INVALID_HANDLE_VALUE){return false;}DWORD file_size = GetFileSize(hFile, 0);char* file_bytes = new char[file_size];if (!file_bytes){CloseHandle(hFile);return false;}DWORD bytes_read;if(!ReadFile(hFile, file_bytes, file_size, &bytes_read, 0)){delete[] file_bytes;CloseHandle(hFile);return false;}char * debuff = new char[file_size+1];decrypt_bytes(file_bytes, file_size, debuff, file_size+1);char file_out[100] = "";strcat_s(file_out, file_path);strcat_s(file_out, ".out.txt");HANDLE hFile2 = CreateFileA(file_out, GENERIC_WRITE, 0, 0, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);if (hFile == INVALID_HANDLE_VALUE){return false;}WriteFile(hFile2, debuff, file_size, &bytes_read, 0);CloseHandle(hFile);CloseHandle(hFile2);}
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