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

Hcs.Client/GostCryptography/Xml/GostKeyValue.cs

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+using GostCryptography.Base;
+using System.Security.Cryptography.Xml;
+using System.Xml;
+
+namespace GostCryptography.Xml
+{
+    /// <summary>
+    /// Параметры открытого ключа цифровой подписи ГОСТ Р 34.10 элемента <see cref="KeyInfo"/>
+    /// </summary>
+    public abstract class GostKeyValue : KeyInfoClause
+    {
+        /// <summary>
+        /// URI пространства имен для XML-подписи ГОСТ Р 34.10
+        /// </summary>
+        public const string XmlDsigNamespaceUrl = "urn:ietf:params:xml:ns:cpxmlsec";
+
+        /// <summary>
+        /// Создает экземпляр класса с заданным публичным ключом
+        /// </summary>
+        protected GostKeyValue(GostAsymmetricAlgorithm publicKey)
+        {
+            PublicKey = publicKey;
+        }
+
+        /// <summary>
+        /// Открытый ключ
+        /// </summary>
+        public GostAsymmetricAlgorithm PublicKey { get; set; }
+
+        /// <inheritdoc />
+        public override void LoadXml(XmlElement element)
+        {
+            if (element == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(element));
+            }
+
+            PublicKey.FromXmlString(element.OuterXml);
+        }
+
+        /// <inheritdoc />
+        public override XmlElement GetXml()
+        {
+            var document = new XmlDocument { PreserveWhitespace = true };
+            var element = document.CreateElement("KeyValue", SignedXml.XmlDsigNamespaceUrl);
+            element.InnerXml = PublicKey.ToXmlString(false);
+            return element;
+        }
+    }
+}