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

Hcs.Client/GostCryptography/Native/ISafeHandleProvider.cs

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+using System.Runtime.InteropServices;
+using System.Security;
+
+namespace GostCryptography.Native
+{
+    /// <summary>
+    /// Провайдер дескрипторов криптографического объекта
+    /// </summary>
+    /// <typeparam name="T">Тип безопасного дескриптора</typeparam>
+    public interface ISafeHandleProvider<out T> where T : SafeHandle
+    {
+        /// <summary>
+        /// Возвращает дескриптор объекта
+        /// </summary>
+        T SafeHandle { [SecurityCritical] get; }
+    }
+
+    /// <summary>
+    /// Методы расширения для <see cref="ISafeHandleProvider{T}"/>
+    /// </summary>
+    public static class SafeHandleProviderExtensions
+    {
+        /// <summary>
+        /// Возвращает дескриптор объекта
+        /// </summary>
+        [SecurityCritical]
+        public static T GetSafeHandle<T>(this ISafeHandleProvider<T> provider) where T : SafeHandle
+        {
+            return provider.SafeHandle;
+        }
+    }
+}