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

Hcs.Client/GostXades/Helpers/KeyInfoHelper.cs

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+using System;
+using System.Security.Cryptography.X509Certificates;
+using System.Security.Cryptography.Xml;
+using System.Xml;
+
+namespace Hcs.GostXades.Helpers
+{
+    public static class KeyInfoHelper
+    {
+        public static KeyInfo Create(X509Certificate2 certificate)
+        {
+            var xmlDocument = new XmlDocument();
+
+            var x509DataElement = xmlDocument.CreateElement("ds", "X509Data", KeyInfoNamespace);
+            var x509CertificateElement = xmlDocument.CreateElement("ds", "X509Certificate", KeyInfoNamespace);
+            x509CertificateElement.InnerText = Convert.ToBase64String(certificate.GetRawCertData());
+
+            x509DataElement.AppendChild(x509CertificateElement);
+
+            var keyInfo = new KeyInfo();
+            keyInfo.AddClause(new KeyInfoNode(x509DataElement));
+
+            return keyInfo;
+        }
+
+        private const string KeyInfoNamespace = "http://www.w3.org/2000/09/xmldsig#";
+    }
+}