diff --git a/src/crypto.cpp b/src/crypto.cpp
index cf33e27..7f0cc49 100755
--- a/src/crypto.cpp
+++ b/src/crypto.cpp
@@ -48,6 +48,43 @@ namespace Tito
 {
 
 
+void Crypto::AssignString(const char * src, size_t len, std::wstring & dst, bool clear)
+{
+	if( clear )
+		dst.clear();
+
+	if( dst.capacity() < dst.size() + len )
+		dst.reserve(dst.size() + len + 128);
+
+	for(size_t i=0 ; i<len ; ++i )
+		dst += static_cast<unsigned char>(src[i]);
+}
+
+void Crypto::AssignString(const wchar_t * src, size_t len, std::string & dst, bool clear)
+{
+	if( clear )
+		dst.clear();
+
+	if( dst.capacity() < dst.size() + len )
+		dst.reserve(dst.size() + len + 128);
+
+	for(size_t i=0 ; i<len ; ++i)
+		dst += static_cast<char>(src[i]);
+}
+
+
+void Crypto::AssignString(const std::string & src, std::wstring & dst, bool clear)
+{
+	AssignString(src.c_str(), src.size(), dst, clear);
+}
+
+void Crypto::AssignString(const std::wstring & src, std::string & dst, bool clear)
+{
+	AssignString(src.c_str(), src.size(), dst, clear);
+}
+
+
+
 
 bool Crypto::SetAESKey(unsigned char aes_key[32])
 {
diff --git a/src/crypto.h b/src/crypto.h
index cc0cde6..08a0562 100755
--- a/src/crypto.h
+++ b/src/crypto.h
@@ -106,6 +106,15 @@ private:
 
 	void Clear();
 
+
+	// temporarily fix for Visual Studio
+	// crypto.obj : error LNK2001: unresolved external symbol "void __cdecl Tito::AssignString(char const *,unsigned int,class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > &,bool)" (?AssignString@Tito@@YAXPBDIAAV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@_N@Z)
+	void AssignString(const char * src, size_t len, std::wstring & dst, bool clear = true);
+	void AssignString(const wchar_t * src, size_t len, std::string & dst, bool clear = true);
+	void AssignString(const std::string & src, std::wstring & dst, bool clear = true);
+	void AssignString(const std::wstring & src, std::string & dst, bool clear = true);
+
+
 };