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diff --git a/src/DotNetOpenAuth/ICryptoKeyStore.cs b/src/DotNetOpenAuth/ICryptoKeyStore.cs
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+++ b/src/DotNetOpenAuth/ICryptoKeyStore.cs
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+//-----------------------------------------------------------------------
+// <copyright file="ICryptoKeyStore.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.Linq;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+
+	/// <summary>
+	/// A persistent store for rotating symmetric cryptographic keys.
+	/// </summary>
+	/// <remarks>
+	/// Implementations should persist it in such a way that the keys are shared across all servers
+	/// on a web farm, where applicable.  
+	/// The store should consider protecting the persistent store against theft resulting in the loss
+	/// of the confidentiality of the keys.  One possible mitigation is to asymmetrically encrypt
+	/// each key using a certificate installed in the server's certificate store.
+	/// </remarks>
+	[ContractClass(typeof(ICryptoKeyStoreContract))]
+	public interface ICryptoKeyStore {
+		/// <summary>
+		/// Gets the key in a given bucket and handle.
+		/// </summary>
+		/// <param name="bucket">The bucket name.  Case sensitive.</param>
+		/// <param name="handle">The key handle.  Case sensitive.</param>
+		/// <returns>The cryptographic key, or <c>null</c> if no matching key was found.</returns>
+		CryptoKey GetKey(string bucket, string handle);
+
+		/// <summary>
+		/// Gets a sequence of existing keys within a given bucket.
+		/// </summary>
+		/// <param name="bucket">The bucket name.  Case sensitive.</param>
+		/// <returns>A sequence of handles and keys, ordered by descending <see cref="CryptoKey.ExpiresUtc"/>.</returns>
+		IEnumerable<KeyValuePair<string, CryptoKey>> GetKeys(string bucket);
+
+		/// <summary>
+		/// Stores a cryptographic key.
+		/// </summary>
+		/// <param name="bucket">The name of the bucket to store the key in.  Case sensitive.</param>
+		/// <param name="handle">The handle to the key, unique within the bucket.  Case sensitive.</param>
+		/// <param name="key">The key to store.</param>
+		void StoreKey(string bucket, string handle, CryptoKey key);
+
+		/// <summary>
+		/// Removes the key.
+		/// </summary>
+		/// <param name="bucket">The bucket name.  Case sensitive.</param>
+		/// <param name="handle">The key handle.  Case sensitive.</param>
+		void RemoveKey(string bucket, string handle);
+	}
+
+	/// <summary>
+	/// Code contract for the <see cref="ICryptoKeyStore"/> interface.
+	/// </summary>
+	[ContractClassFor(typeof(ICryptoKeyStore))]
+	internal abstract class ICryptoKeyStoreContract : ICryptoKeyStore {
+		/// <summary>
+		/// See the <see cref="ICryptoKeyStore"/> interface.
+		/// </summary>
+		CryptoKey ICryptoKeyStore.GetKey(string bucket, string handle) {
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(bucket));
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(handle));
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// See the <see cref="ICryptoKeyStore"/> interface.
+		/// </summary>
+		IEnumerable<KeyValuePair<string, CryptoKey>> ICryptoKeyStore.GetKeys(string bucket) {
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(bucket));
+			Contract.Ensures(Contract.Result<IEnumerable<KeyValuePair<string, CryptoKey>>>() != null);
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// See the <see cref="ICryptoKeyStore"/> interface.
+		/// </summary>
+		void ICryptoKeyStore.StoreKey(string bucket, string handle, CryptoKey key) {
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(bucket));
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(handle));
+			Contract.Requires<ArgumentNullException>(key != null, "key");
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// See the <see cref="ICryptoKeyStore"/> interface.
+		/// </summary>
+		void ICryptoKeyStore.RemoveKey(string bucket, string handle) {
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(bucket));
+			Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(handle));
+			throw new NotImplementedException();
+		}
+	}
+}