Init: Migrate SimpleRemoter (Since v1.3.1) to Gitea

common/ip_enc.h

@@ -0,0 +1,60 @@
+#pragma once
+
+#include <vector>
+#include <cstdint>
+#include <string>
+
+// Encode for IP and Port.
+// provided by ChatGPT.
+class StreamCipher
+{
+private:
+    uint32_t state;
+
+    // 简单非线性伪随机数生成器
+    uint8_t prngNext()
+    {
+        // 例子：xorshift32，改造一点非线性
+        state ^= (state << 13);
+        state ^= (state >> 17);
+        state ^= (state << 5);
+        // 再混合一个简单的非线性变换
+        uint8_t out = (state & 0xFF) ^ ((state >> 8) & 0xFF);
+        return out;
+    }
+
+public:
+    StreamCipher(uint32_t key) : state(key) {}
+
+    // 加密解密（对称，长度不变）
+    void process(uint8_t* data, size_t len)
+    {
+        for (size_t i = 0; i < len; ++i) {
+            data[i] ^= prngNext();
+        }
+    }
+};
+
+class PrintableXORCipher
+{
+public:
+    // 对称加解密，输入和输出均为可打印字符
+    // 前提：输入是32~126范围的字符
+    void process(char* data, size_t len)
+    {
+        for (size_t i = 0; i < len; ++i) {
+            char c = data[i];
+            // 保证输入字符是可打印范围
+            if (c < 32 || c > 126) {
+                // 不处理非打印字符（或者你也可以自定义错误处理）
+                continue;
+            }
+            // 异或0x55（'U'）且确保结果仍是32~126之间
+            char encrypted = c ^ 0x55;
+            // 如果不在范围，修正回范围内（简单加减循环）
+            if (encrypted < 32) encrypted += 95;
+            if (encrypted > 126) encrypted -= 95;
+            data[i] = encrypted;
+        }
+    }
+};