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

Hcs.Client/GostCryptography/Native/SafeKeyHandleImpl.cs

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