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diff --git a/src/DotNetOpenAuth.OpenId/OpenId/Messages/AssociateUnencryptedResponse.cs b/src/DotNetOpenAuth.OpenId/OpenId/Messages/AssociateUnencryptedResponse.cs
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+++ b/src/DotNetOpenAuth.OpenId/OpenId/Messages/AssociateUnencryptedResponse.cs
@@ -0,0 +1,70 @@
+//-----------------------------------------------------------------------
+// <copyright file="AssociateUnencryptedResponse.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.Messages {
+	using System;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Reflection;
+	using DotNetOpenAuth.OpenId.Provider;
+
+	/// <summary>
+	/// The successful unencrypted association response message.
+	/// </summary>
+	/// <remarks>
+	/// Association response messages are described in OpenID 2.0 section 8.2.  This type covers section 8.2.2.
+	/// </remarks>
+	internal class AssociateUnencryptedResponse : AssociateSuccessfulResponse {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="AssociateUnencryptedResponse"/> class.
+		/// </summary>
+		/// <param name="responseVersion">The OpenID version of the response message.</param>
+		/// <param name="originatingRequest">The originating request.</param>
+		internal AssociateUnencryptedResponse(Version responseVersion, AssociateUnencryptedRequest originatingRequest)
+			: base(responseVersion, originatingRequest) {
+			SessionType = Protocol.Args.SessionType.NoEncryption;
+		}
+
+		/// <summary>
+		/// Gets or sets the MAC key (shared secret) for this association, Base 64 (Josefsson, S., “The Base16, Base32, and Base64 Data Encodings,” .) [RFC3548] encoded. 
+		/// </summary>
+		[MessagePart("mac_key", IsRequired = true, AllowEmpty = false)]
+		internal byte[] MacKey { get; set; }
+
+		/// <summary>
+		/// Called to create the Association based on a request previously given by the Relying Party.
+		/// </summary>
+		/// <param name="request">The prior request for an association.</param>
+		/// <param name="associationStore">The Provider's association store.</param>
+		/// <param name="securitySettings">The security settings of the Provider.</param>
+		/// <returns>
+		/// The created association.
+		/// </returns>
+		/// <remarks>
+		///   <para>The caller will update this message's
+		///   <see cref="AssociateSuccessfulResponse.ExpiresIn"/> and
+		///   <see cref="AssociateSuccessfulResponse.AssociationHandle"/>
+		/// properties based on the <see cref="Association"/> returned by this method, but any other
+		/// association type specific properties must be set by this method.</para>
+		///   <para>The response message is updated to include the details of the created association by this method,
+		/// but the resulting association is <i>not</i> added to the association store and must be done by the caller.</para>
+		/// </remarks>
+		protected override Association CreateAssociationAtProvider(AssociateRequest request, IProviderAssociationStore associationStore, ProviderSecuritySettings securitySettings) {
+			Association association = HmacShaAssociation.Create(Protocol, this.AssociationType, AssociationRelyingPartyType.Smart, associationStore, securitySettings);
+			this.MacKey = association.SecretKey;
+			return association;
+		}
+
+		/// <summary>
+		/// Called to create the Association based on a request previously given by the Relying Party.
+		/// </summary>
+		/// <param name="request">The prior request for an association.</param>
+		/// <returns>The created association.</returns>
+		protected override Association CreateAssociationAtRelyingParty(AssociateRequest request) {
+			Association association = HmacShaAssociation.Create(Protocol, this.AssociationType, this.AssociationHandle, this.MacKey, TimeSpan.FromSeconds(this.ExpiresIn));
+			return association;
+		}
+	}
+}