Implement Reset in MD5Hasher

Chaos/Hash/Md5.hpp

@@ -187,12 +187,13 @@ class Md5Hasher : public Hasher<Md5Hasher>
 {
 public:
     Md5Hasher()
-        : BlockSize_(0)
-        , Word_(0)
-        , WordBytesPacked_(0)
-        , MessageSizeBytes_(0)
     {
-        Block_.fill(0);
+        ResetImpl();
+    }
+
+    void Reset()
+    {
+        ResetImpl();
     }
 
     template<typename InputIt>
@@ -280,6 +281,17 @@ private:
 
     uint64_t MessageSizeBytes_;
 
+    void ResetImpl()
+    {
+        Buffer_ = Inner_::Buffer();
+        Block_.fill(0);
+
+        BlockSize_ = 0;
+        Word_ = 0;
+        WordBytesPacked_ = 0;
+        MessageSizeBytes_ = 0;
+    }
+
     template<typename InputIt>
     uint64_t UpdateImpl(InputIt begin, InputIt end)
     {