// 字節循環右移 unsigned char RorByte(unsigned char bData, size_t shift) {unsigned char temp = bData >> (8 - shift);bData = bData << shift;bData = bData | temp;return bData; }// 加密函數：先與密鑰異或，然后取反，然后右移3位 void NaiveEncrypt(void *pData, size_t byteDataLen, const void *pKey, const size_t byteKeyLen) {size_t uDataIndex = 0, uKeyIndex = 0;for (; uDataIndex < byteDataLen; uDataIndex++){((char *)pData)[uDataIndex] = ((char*)pData)[uDataIndex] ^ ((char *)pKey)[uKeyIndex];((char *)pData)[uDataIndex] = ~((char *)pData)[uDataIndex];RorByte(((unsigned char *)pData)[uDataIndex], 3);uKeyIndex++;if (uKeyIndex == byteKeyLen) uKeyIndex = 0;} }// 解密函數：先右移5位，再取反，在與密鑰異或 void NaiveDecrypt(void *pData, size_t byteDataLen, const void *pKey, const size_t byteKeyLen) {size_t uDataIndex = 0, uKeyIndex = 0;for (; uDataIndex < byteDataLen; uDataIndex++){RorByte(((unsigned char *)pData)[uDataIndex], 5);((char *)pData)[uDataIndex] = ~((char *)pData)[uDataIndex];((char *)pData)[uDataIndex] = ((char *)pData)[uDataIndex] ^ ((char *)pKey)[uKeyIndex];uKeyIndex++;if (uKeyIndex == byteKeyLen) uKeyIndex = 0;} }

使用起來也是非常簡單

int main() {// 這里用字符串演示，實際上可以加密任意字節流char data[] = "some plain text";size_t dataLen = strlen(data);char key[] = "123456";size_t keyLen = strlen(key);printf("加密前\n");for (size_t i = 0; i < dataLen; i++){printf("%02X ", (unsigned char)data[i]);}printf("\n\n");// 加密NaiveEncrypt(data, dataLen, key, keyLen);printf("加密后\n");for (size_t i = 0; i < dataLen; i++){printf("%02X ", (unsigned char)data[i]);}printf("\n\n");// 解密NaiveEncrypt(data, dataLen, key, keyLen);printf("解密后\n");for (size_t i = 0; i < dataLen; i++){printf("%02X ", (unsigned char)data[i]);}printf("\n\n");return 0; }

總結

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