修改 md5 加密库

docs/misc/sign/APP.md

@@ -218,15 +218,15 @@ print(signResult)
 
 ### CplusPlus
 
-需要 c++ 23 标准库，[cpr](https://github.com/libcpr/cpr)、[cryptopp](https://github.com/weidai11/cryptopp)、[nlohmann/json](https://github.com/nlohmann/json) 等依赖
+需要 c++ 23 标准库，[cpr](https://github.com/libcpr/cpr)、[botan](https://github.com/randombit/botan)、[nlohmann/json](https://github.com/nlohmann/json) 等依赖
 
 ```c++
 #include <print>    // std::println
 
 /// thrid party libraries
+#include <botan/hash.h>
+#include <botan/hex.h>
 #include <cpr/cpr.h>            // cpr::util::urlEncode()
-#include <cryptopp/md5.h>
-#include <cryptopp/hex.h>
 #include <nlohmann/json.hpp>
 
 /*
@@ -235,19 +235,9 @@ print(signResult)
 
 /* 获取 md5 hex(lower) */
 std::string Get_md5_hex(const std::string &Input_str) {
-    CryptoPP::Weak1::MD5 hash;
-    std::string          md5_hex;
-
-    CryptoPP::StringSource ss(Input_str, true,
-        new CryptoPP::HashFilter(hash,
-            new CryptoPP::HexEncoder(
-                new CryptoPP::StringSink(md5_hex)
-            )
-        )
-    );
-
-    std::ranges::for_each(md5_hex, [](char &x) { x = std::tolower(x); });
-    return md5_hex;
+    const auto md5 = Botan::HashFunction::create_or_throw("MD5");
+    md5->update(Input_str);
+    return Botan::hex_encode(md5->final(), false);
 }
 
 /* 将 json 转换为 url 编码字符串 */