1 files changed, 50 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/Messages/AssociateDiffieHellmanRelyingPartyResponse.cs b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/Messages/AssociateDiffieHellmanRelyingPartyResponse.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/Messages/AssociateDiffieHellmanRelyingPartyResponse.cs
@@ -0,0 +1,50 @@
+//-----------------------------------------------------------------------
+// <copyright file="AssociateDiffieHellmanRelyingPartyResponse.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.Messages {
+	using System;
+	using System.Diagnostics.Contracts;
+	using System.Security.Cryptography;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Reflection;
+	using Org.Mentalis.Security.Cryptography;
+
+	/// <summary>
+	/// The successful Diffie-Hellman association response message.
+	/// </summary>
+	/// <remarks>
+	/// Association response messages are described in OpenID 2.0 section 8.2.  This type covers section 8.2.3.
+	/// </remarks>
+	internal class AssociateDiffieHellmanRelyingPartyResponse : AssociateDiffieHellmanResponse {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="AssociateDiffieHellmanRelyingPartyResponse"/> class.
+		/// </summary>
+		/// <param name="responseVersion">The OpenID version of the response message.</param>
+		/// <param name="originatingRequest">The originating request.</param>
+		internal AssociateDiffieHellmanRelyingPartyResponse(Version responseVersion, AssociateDiffieHellmanRequest originatingRequest)
+			: base(responseVersion, originatingRequest) {
+		}
+
+		/// <summary>
+		/// Creates the association at relying party side after the association response has been received.
+		/// </summary>
+		/// <param name="request">The original association request that was already sent and responded to.</param>
+		/// <returns>The newly created association.</returns>
+		/// <remarks>
+		/// The resulting association is <i>not</i> added to the association store and must be done by the caller.
+		/// </remarks>
+		protected Association CreateAssociationAtRelyingParty(AssociateRequest request) {
+			var diffieHellmanRequest = request as AssociateDiffieHellmanRequest;
+			ErrorUtilities.VerifyArgument(diffieHellmanRequest != null, OpenIdStrings.DiffieHellmanAssociationRequired);
+
+			HashAlgorithm hasher = DiffieHellmanUtilities.Lookup(Protocol, this.SessionType);
+			byte[] associationSecret = DiffieHellmanUtilities.SHAHashXorSecret(hasher, diffieHellmanRequest.Algorithm, this.DiffieHellmanServerPublic, this.EncodedMacKey);
+
+			Association association = HmacShaAssociation.Create(Protocol, this.AssociationType, this.AssociationHandle, associationSecret, TimeSpan.FromSeconds(this.ExpiresIn));
+			return association;
+		}
+	}
+}