diff --git a/Encrypt/CMakeLists.txt b/Encrypt/CMakeLists.txt
index 1a2475b..3e8b71a 100644
--- a/Encrypt/CMakeLists.txt
+++ b/Encrypt/CMakeLists.txt
@@ -28,7 +28,7 @@ target_include_directories(mbedtls-${MBEDTLS_VERSION}
 )
 
 target_link_libraries(Encrypt
-    PRIVATE mbedtls-${MBEDTLS_VERSION}
+    PUBLIC mbedtls-${MBEDTLS_VERSION}
 )
 
 if(UNIX)
diff --git a/Universal/StringUtility.cpp b/Universal/StringUtility.cpp
index 756d618..9ffad08 100644
--- a/Universal/StringUtility.cpp
+++ b/Universal/StringUtility.cpp
@@ -1,8 +1,10 @@
 #include "StringUtility.h"
 #include "BoostLog.h"
-#include <algorithm>
 #include <cctype>
 #include <codecvt>
+#ifdef WIN32
+#include <Windows.h>
+#endif
 
 namespace Amass {
 
@@ -54,6 +56,18 @@ std::wstring stringToWString(const std::string &string) {
     return converter.from_bytes(string);
 }
 
+std::string wstringToString(const std::wstring &string) {
+#ifdef WIN32
+    int sizeNeeded = WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.size(), NULL, 0, NULL, NULL);
+    std::string ret(sizeNeeded, 0);
+    WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.size(), &ret[0], sizeNeeded, NULL, NULL);
+#else
+    std::string ret;
+    assert(false && "not implement.");
+#endif
+    return ret;
+}
+
 bool equal(std::string_view lhs, std::string_view rhs, bool caseSensitivity) {
     auto n = lhs.size();
     if (rhs.size() != n) return false;
diff --git a/Universal/StringUtility.h b/Universal/StringUtility.h
index 70d7a10..7da127c 100644
--- a/Universal/StringUtility.h
+++ b/Universal/StringUtility.h
@@ -60,6 +60,7 @@ size_t utf8Length(const std::string &text);
 std::string_view utf8At(const std::string &text, size_t index);
 size_t utf8CharacterByteSize(const char *character);
 std::wstring stringToWString(const std::string &string);
+std::string wstringToString(const std::wstring &string);
 
 } // namespace StringUtility