CTF中遇到的有趣異或加密
阿新 • • 發佈:2021-10-28
程式碼整理為了C語言.
提取了核心的異或程式碼.
作者:IBinary 出處:https://www.cnblogs.com/iBinary/unsigned char* encode(const unsigned char* enbuffer, int enbufferlen) { unsigned char* result = (unsigned char*)malloc(enbufferlen * sizeof(char) + 1); if (result == nullptr) return nullptr; memset(result, 0, enbufferlen + 1); for (int i = 0; i < enbufferlen; i += 3) { result[i] = enbufferlen ^ (enbuffer[i] + 6); result[i + 1] = (enbuffer[i + 1] - 6) ^ enbufferlen; result[i + 2] = enbuffer[i + 2] ^ 6 ^ enbufferlen; } return result; // //zerobuffer = flag } unsigned char* decode(const unsigned char* debuffer, int debufferlen) { unsigned char* result = (unsigned char*)malloc(debufferlen * sizeof(char)); if (result == nullptr) return nullptr; memset(result, 0, debufferlen + 1); for (int i = 0; i < debufferlen; i += 3) { result[i] = (debufferlen ^ debuffer[i]) -6; result[i + 1] = (debuffer[i + 1] ^ debufferlen) + 6; result[i + 2] = debuffer[i + 2] ^ 6 ^ debufferlen; } return result; } int main(int argc,char**argv) { unsigned char buffer[] = "HelloIBinary"; int size = sizeof(buffer) / sizeof(buffer[0]); unsigned char * CipherText = encode(buffer, size); unsigned char * PlantText = decode(CipherText, size); }
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