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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.

Hcs.Client/GostCryptography/Native/SafeHashHandleImpl.cs

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+using Microsoft.Win32.SafeHandles;
+using System;
+using System.Security;
+
+namespace GostCryptography.Native
+{
+    /// <summary>
+    /// Дескриптор функции хэширования криптографического провайдера
+    /// </summary>
+    [SecurityCritical]
+    public class SafeHashHandleImpl : SafeHandleZeroOrMinusOneIsInvalid
+    {
+        public static SafeHashHandleImpl InvalidHandle => new SafeHashHandleImpl(IntPtr.Zero);
+
+        public SafeHashHandleImpl() : base(true)
+        {
+        }
+
+        public SafeHashHandleImpl(IntPtr handle) : base(true)
+        {
+            SetHandle(handle);
+        }
+
+        [SecurityCritical]
+        protected override bool ReleaseHandle()
+        {
+            CryptoApi.CryptDestroyHash(handle);
+            return true;
+        }
+    }
+}