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diff --git a/src/DotNetOpenAuth.OAuth/OAuth/ServiceProviderDescription.cs b/src/DotNetOpenAuth.OAuth/OAuth/ServiceProviderDescription.cs
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+++ b/src/DotNetOpenAuth.OAuth/OAuth/ServiceProviderDescription.cs
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+//-----------------------------------------------------------------------
+// <copyright file="ServiceProviderDescription.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth {
+	using System;
+	using System.Diagnostics;
+	using System.Diagnostics.CodeAnalysis;
+	using System.Diagnostics.Contracts;
+	using System.Linq;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.OAuth.ChannelElements;
+
+	/// <summary>
+	/// A description of the endpoints on a Service Provider.
+	/// </summary>
+	public class ServiceProviderDescription {
+		/// <summary>
+		/// The field used to store the value of the <see cref="RequestTokenEndpoint"/> property.
+		/// </summary>
+		[DebuggerBrowsable(DebuggerBrowsableState.Never)]
+		private MessageReceivingEndpoint requestTokenEndpoint;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="ServiceProviderDescription"/> class.
+		/// </summary>
+		public ServiceProviderDescription() {
+			this.ProtocolVersion = Protocol.Default.ProtocolVersion;
+		}
+
+		/// <summary>
+		/// Gets or sets the OAuth version supported by the Service Provider.
+		/// </summary>
+		public ProtocolVersion ProtocolVersion { get; set; }
+
+		/// <summary>
+		/// Gets or sets the URL used to obtain an unauthorized Request Token,
+		/// described in Section 6.1 (Obtaining an Unauthorized Request Token).
+		/// </summary>
+		/// <remarks>
+		/// The request URL query MUST NOT contain any OAuth Protocol Parameters.
+		/// This is the URL that <see cref="OAuth.Messages.UnauthorizedTokenRequest"/> messages are directed to.
+		/// </remarks>
+		/// <exception cref="ArgumentException">Thrown if this property is set to a URI with OAuth protocol parameters.</exception>
+		public MessageReceivingEndpoint RequestTokenEndpoint {
+			get {
+				return this.requestTokenEndpoint;
+			}
+
+			set {
+				if (value != null && UriUtil.QueryStringContainPrefixedParameters(value.Location, OAuth.Protocol.ParameterPrefix)) {
+					throw new ArgumentException(OAuthStrings.RequestUrlMustNotHaveOAuthParameters);
+				}
+
+				this.requestTokenEndpoint = value;
+			}
+		}
+
+		/// <summary>
+		/// Gets or sets the URL used to obtain User authorization for Consumer access, 
+		/// described in Section 6.2 (Obtaining User Authorization).
+		/// </summary>
+		/// <remarks>
+		/// This is the URL that <see cref="OAuth.Messages.UserAuthorizationRequest"/> messages are
+		/// indirectly (via the user agent) sent to.
+		/// </remarks>
+		public MessageReceivingEndpoint UserAuthorizationEndpoint { get; set; }
+
+		/// <summary>
+		/// Gets or sets the URL used to exchange the User-authorized Request Token 
+		/// for an Access Token, described in Section 6.3 (Obtaining an Access Token).
+		/// </summary>
+		/// <remarks>
+		/// This is the URL that <see cref="OAuth.Messages.AuthorizedTokenRequest"/> messages are directed to.
+		/// </remarks>
+		public MessageReceivingEndpoint AccessTokenEndpoint { get; set; }
+
+		/// <summary>
+		/// Gets or sets the signing policies that apply to this Service Provider.
+		/// </summary>
+		[SuppressMessage("Microsoft.Performance", "CA1819:PropertiesShouldNotReturnArrays", Justification = "Type initializers require this format.")]
+		public ITamperProtectionChannelBindingElement[] TamperProtectionElements { get; set; }
+
+		/// <summary>
+		/// Gets the OAuth version supported by the Service Provider.
+		/// </summary>
+		internal Version Version {
+			get { return Protocol.Lookup(this.ProtocolVersion).Version; }
+		}
+
+		/// <summary>
+		/// Creates a signing element that includes all the signing elements this service provider supports.
+		/// </summary>
+		/// <returns>The created signing element.</returns>
+		internal ITamperProtectionChannelBindingElement CreateTamperProtectionElement() {
+			Contract.Requires(this.TamperProtectionElements != null);
+			return new SigningBindingElementChain(this.TamperProtectionElements.Select(el => (ITamperProtectionChannelBindingElement)el.Clone()).ToArray());
+		}
+	}
+}