Fix handling of Subject Names with specials Characters / and = using " as escaping character

Stack/Opc.Ua.Core/Security/Certificates/X509Utils.cs

@@ -437,8 +437,9 @@ public static List<string> ParseDistinguishedName(string name)
                     {
                         buffer.Append(value);
                     }
-
-                    fields.Add(buffer.ToString());
+                    //remove subject name escaping character " (used for escaping = and / ) from result as per spec Part 12 7.9.4
+                    string filtered = buffer.Replace("\"/\"", "/").Replace("\"=\"", "=").ToString();
+                    fields.Add(filtered);
                     buffer.Length = 0;
                 }
 

Tests/Opc.Ua.Core.Tests/Security/Certificates/X509UtilsTest.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.Contracts;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NUnit.Framework;
+
+namespace Opc.Ua.Core.Tests.Security.Certificates
+{
+    /// <summary>
+    /// Tests for the <see cref="X509Utils"/> class
+    /// </summary>
+    [TestFixture, Category("X509Utils")]
+    [Parallelizable]
+    [SetCulture("en-us")]
+    public class X509UtilsTest
+    {
+        [TestCase("CN=UA Yellow Green Server,DC=dogblueberry,O=OPC\"=\"Foundation")]
+        [TestCase("CN=UA Yellow Green Server,DC=dogblueberry,O=\"OPC=Foundation\"")]
+        public void ParseDistinguishedNameHandlesEscapingOfEqualsChar(string input)
+        {
+            List<string> result = X509Utils.ParseDistinguishedName(input);
+
+            Assert.True(result.Count == 3);
+            Assert.Contains("CN=UA Yellow Green Server", result);
+            Assert.Contains("DC=dogblueberry", result);
+            Assert.Contains("O=\"OPC=Foundation\"", result);
+        }
+
+
+
+        [TestCase("CN = UA Yellow Blue Server, DC = dogredberry, O =\"OPC/Foundation\"")]
+        [TestCase("CN = UA Yellow Blue Server, DC = dogredberry, O =OPC\"/\"Foundation")]
+        public void ParseDistinguishedNameHandlesEscapingOfSlashChar(string input)
+        {
+            List<string> result = X509Utils.ParseDistinguishedName(input);
+
+            Assert.True(result.Count == 3);
+            Assert.Contains("CN=UA Yellow Blue Server", result);
+            Assert.Contains("DC=dogredberry", result);
+            Assert.Contains("O=\"OPC/Foundation\"", result);
+        }
+    }
+}