1 files changed, 61 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth.Consumer/OAuth/ChannelElements/RsaSha1ConsumerSigningBindingElement.cs b/src/DotNetOpenAuth.OAuth.Consumer/OAuth/ChannelElements/RsaSha1ConsumerSigningBindingElement.cs
new file mode 100644
index 0000000..ba451e5
--- /dev/null
+++ b/src/DotNetOpenAuth.OAuth.Consumer/OAuth/ChannelElements/RsaSha1ConsumerSigningBindingElement.cs
@@ -0,0 +1,61 @@
+//-----------------------------------------------------------------------
+// <copyright file="RsaSha1SigningBindingElement.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth.ChannelElements {
+	using System;
+	using System.Diagnostics.Contracts;
+	using System.Security.Cryptography;
+	using System.Security.Cryptography.X509Certificates;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+
+	/// <summary>
+	/// A binding element that signs outgoing messages and verifies the signature on incoming messages.
+	/// </summary>
+	public class RsaSha1ConsumerSigningBindingElement : RsaSha1SigningBindingElement {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="RsaSha1SigningBindingElement"/> class.
+		/// </summary>
+		/// <param name="signingCertificate">The certificate used to sign outgoing messages.</param>
+		public RsaSha1ConsumerSigningBindingElement(X509Certificate2 signingCertificate) {
+			Contract.Requires<ArgumentNullException>(signingCertificate != null);
+
+			this.SigningCertificate = signingCertificate;
+		}
+
+		/// <summary>
+		/// Gets or sets the certificate used to sign outgoing messages.  Used only by Consumers.
+		/// </summary>
+		public X509Certificate2 SigningCertificate { get; set; }
+
+		protected override bool IsSignatureValid(ITamperResistantOAuthMessage message) {
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// Calculates a signature for a given message.
+		/// </summary>
+		/// <param name="message">The message to sign.</param>
+		/// <returns>The signature for the message.</returns>
+		/// <remarks>
+		/// This method signs the message per OAuth 1.0 section 9.3.
+		/// </remarks>
+		protected override string GetSignature(ITamperResistantOAuthMessage message) {
+			ErrorUtilities.VerifyOperation(this.SigningCertificate != null, OAuthStrings.X509CertificateNotProvidedForSigning);
+
+			string signatureBaseString = ConstructSignatureBaseString(message, this.Channel.MessageDescriptions.GetAccessor(message));
+			byte[] data = Encoding.ASCII.GetBytes(signatureBaseString);
+			var provider = (RSACryptoServiceProvider)this.SigningCertificate.PrivateKey;
+			byte[] binarySignature = provider.SignData(data, "SHA1");
+			string base64Signature = Convert.ToBase64String(binarySignature);
+			return base64Signature;
+		}
+
+		protected override ITamperProtectionChannelBindingElement Clone() {
+			return new RsaSha1ConsumerSigningBindingElement(this.SigningCertificate);
+		}
+	}
+}