From 3659e64274fd601d43cbabd249476f65111974e6 Mon Sep 17 00:00:00 2001
From: Adam Frisby
Date: Fri, 27 Apr 2007 02:16:57 +0000
Subject: Added challenge generation function to generate cryptographic
 strength challenges.

---
 OpenSim.Framework/Remoting.cs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'OpenSim.Framework')

diff --git a/OpenSim.Framework/Remoting.cs b/OpenSim.Framework/Remoting.cs
index 88f5598..12208fa 100644
--- a/OpenSim.Framework/Remoting.cs
+++ b/OpenSim.Framework/Remoting.cs
@@ -73,8 +73,27 @@ namespace OpenSim.Framework
         }
 
         /// <summary>
+        /// Generates a new challenge string to be issued to a foreign host. Challenges are 1024-bit messages generated using the Crytographic Random Number Generator.
+        /// </summary>
+        /// <returns>A 128-character hexadecimal string containing the challenge.</returns>
+        public static string GenerateChallenge()
+        {
+            RNGCryptoServiceProvider RNG = new RNGCryptoServiceProvider();
+            byte[] bytes = new byte[64];
+            RNG.GetBytes(bytes);
+
+            StringBuilder sb = new StringBuilder(bytes.Length * 2);
+            foreach (byte b in bytes)
+            {
+                sb.AppendFormat("{0:x2}", b);
+            }
+            return sb.ToString();
+        }
+
+        /// <summary>
         /// Helper function, merges two byte arrays
         /// </summary>
+        /// <remarks>Sourced from MSDN Forum</remarks>
         /// <param name="a">A</param>
         /// <param name="b">B</param>
         /// <returns>C</returns>
-- 
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