1 files changed, 65 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth/OpenId/AssociationContract.cs b/src/DotNetOpenAuth/OpenId/AssociationContract.cs
new file mode 100644
index 0000000..7a8398e
--- /dev/null
+++ b/src/DotNetOpenAuth/OpenId/AssociationContract.cs
@@ -0,0 +1,65 @@
+//-----------------------------------------------------------------------
+// <copyright file="AssociationContract.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId {
+	using System;
+	using System.Diagnostics;
+	using System.Diagnostics.CodeAnalysis;
+	using System.Diagnostics.Contracts;
+	using System.IO;
+	using System.Security.Cryptography;
+	using System.Text;
+	using DotNetOpenAuth.Configuration;
+	using DotNetOpenAuth.Messaging;
+
+	/// <summary>
+	/// Code contract for the <see cref="Association"/> class.
+	/// </summary>
+	[ContractClassFor(typeof(Association))]
+	internal abstract class AssociationContract : Association {
+		/// <summary>
+		/// Prevents a default instance of the <see cref="AssociationContract"/> class from being created.
+		/// </summary>
+		private AssociationContract()
+			: base(null, null, TimeSpan.Zero, DateTime.Now) {
+		}
+
+		/// <summary>
+		/// Gets the length (in bits) of the hash this association creates when signing.
+		/// </summary>
+		public override int HashBitLength {
+			get {
+				Contract.Ensures(Contract.Result<int>() > 0);
+				throw new NotImplementedException();
+			}
+		}
+
+		/// <summary>
+		/// The string to pass as the assoc_type value in the OpenID protocol.
+		/// </summary>
+		/// <param name="protocol">The protocol version of the message that the assoc_type value will be included in.</param>
+		/// <returns>
+		/// The value that should be used for  the openid.assoc_type parameter.
+		/// </returns>
+		[Pure]
+		internal override string GetAssociationType(Protocol protocol) {
+			Contract.Requires(protocol != null);
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// Returns the specific hash algorithm used for message signing.
+		/// </summary>
+		/// <returns>
+		/// The hash algorithm used for message signing.
+		/// </returns>
+		[Pure]
+		protected override HashAlgorithm CreateHasher() {
+			Contract.Ensures(Contract.Result<HashAlgorithm>() != null);
+			throw new NotImplementedException();
+		}
+	}
+}