1 files changed, 59 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth.Consumer/OAuth/OAuth1HmacSha1HttpMessageHandler.cs b/src/DotNetOpenAuth.OAuth.Consumer/OAuth/OAuth1HmacSha1HttpMessageHandler.cs
new file mode 100644
index 0000000..11de257
--- /dev/null
+++ b/src/DotNetOpenAuth.OAuth.Consumer/OAuth/OAuth1HmacSha1HttpMessageHandler.cs
@@ -0,0 +1,59 @@
+//-----------------------------------------------------------------------
+// <copyright file="OAuth1HmacSha1HttpMessageHandler.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Net.Http;
+	using System.Security.Cryptography;
+	using System.Text;
+	using System.Threading.Tasks;
+
+	/// <summary>
+	/// A delegating HTTP handler that signs outgoing HTTP requests 
+	/// with an HMAC-SHA1 signature.
+	/// </summary>
+	public class OAuth1HmacSha1HttpMessageHandler : OAuth1HttpMessageHandlerBase {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OAuth1HmacSha1HttpMessageHandler"/> class.
+		/// </summary>
+		public OAuth1HmacSha1HttpMessageHandler() {
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OAuth1HmacSha1HttpMessageHandler"/> class.
+		/// </summary>
+		/// <param name="innerHandler">The inner handler which is responsible for processing the HTTP response messages.</param>
+		public OAuth1HmacSha1HttpMessageHandler(HttpMessageHandler innerHandler)
+			: base(innerHandler) {
+		}
+
+		/// <summary>
+		/// Calculates the signature for the specified buffer.
+		/// </summary>
+		/// <param name="signedPayload">The payload to calculate the signature for.</param>
+		/// <returns>
+		/// The signature.
+		/// </returns>
+		protected override byte[] Sign(byte[] signedPayload) {
+			using (var algorithm = HMACSHA1.Create()) {
+				algorithm.Key = Encoding.ASCII.GetBytes(this.GetConsumerAndTokenSecretString());
+				return algorithm.ComputeHash(signedPayload);
+			}
+		}
+
+		/// <summary>
+		/// Gets the signature method to include in the oauth_signature_method parameter.
+		/// </summary>
+		/// <value>
+		/// The signature method.
+		/// </value>
+		protected override string SignatureMethod {
+			get { return "HMAC-SHA1"; }
+		}
+	}
+}