From e55e3b6f5a9f14e2971769d3a619eaec878c2e89 Mon Sep 17 00:00:00 2001
From: Kiran Challa <kichalla@microsoft.com>
Date: Tue, 1 Nov 2016 12:22:42 -0700
Subject: [PATCH] Updated Authentication's Base64UrlTextEncoder to use
 WebUtilities's Base64UrlTextEncoder logic

---
 .../DataHandler/TextEncoder.cs                | 29 +++++++++----------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/src/Microsoft.AspNetCore.Authentication/DataHandler/TextEncoder.cs b/src/Microsoft.AspNetCore.Authentication/DataHandler/TextEncoder.cs
index c07a314b05..c0663295cf 100644
--- a/src/Microsoft.AspNetCore.Authentication/DataHandler/TextEncoder.cs
+++ b/src/Microsoft.AspNetCore.Authentication/DataHandler/TextEncoder.cs
@@ -1,31 +1,30 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
-
 namespace Microsoft.AspNetCore.Authentication
 {
     public static class Base64UrlTextEncoder
     {
+        /// <summary>
+        /// Encodes supplied data into Base64 and replaces any URL encodable characters into non-URL encodable
+        /// characters.
+        /// </summary>
+        /// <param name="data">Data to be encoded.</param>
+        /// <returns>Base64 encoded string modified with non-URL encodable characters</returns>
         public static string Encode(byte[] data)
         {
-            return Convert.ToBase64String(data).TrimEnd('=').Replace('+', '-').Replace('/', '_');
+            return WebUtilities.Base64UrlTextEncoder.Encode(data);
         }
 
+        /// <summary>
+        /// Decodes supplied string by replacing the non-URL encodable characters with URL encodable characters and
+        /// then decodes the Base64 string.
+        /// </summary>
+        /// <param name="text">The string to be decoded.</param>
+        /// <returns>The decoded data.</returns>
         public static byte[] Decode(string text)
         {
-            return Convert.FromBase64String(Pad(text.Replace('-', '+').Replace('_', '/')));
+            return WebUtilities.Base64UrlTextEncoder.Decode(text);
         }
-
-        private static string Pad(string text)
-        {
-            var padding = 3 - ((text.Length + 3) % 4);
-            if (padding == 0)
-            {
-                return text;
-            }
-            return text + new string('=', padding);
-        }
-
     }
 }