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//-----------------------------------------------------------------------
// <copyright file="HmacSha1SigningBindingElement.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth.ChannelElements {
using System;
using System.Diagnostics.CodeAnalysis;
using System.Security.Cryptography;
using System.Text;
using DotNetOpenAuth.Messaging;
/// <summary>
/// A binding element that signs outgoing messages and verifies the signature on incoming messages.
/// </summary>
public class HmacSha1SigningBindingElement : SigningBindingElementBase {
/// <summary>
/// Initializes a new instance of the <see cref="HmacSha1SigningBindingElement"/> class
/// </summary>
public HmacSha1SigningBindingElement()
: base("HMAC-SHA1") {
}
/// <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 9.2.
/// </remarks>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "False positive.")]
protected override string GetSignature(ITamperResistantOAuthMessage message) {
string key = GetConsumerAndTokenSecretString(message);
using (var hasher = HmacAlgorithms.Create(HmacAlgorithms.HmacSha1, Encoding.ASCII.GetBytes(key))) {
string baseString = ConstructSignatureBaseString(message, this.Channel.MessageDescriptions.GetAccessor(message));
byte[] digest = hasher.ComputeHash(Encoding.ASCII.GetBytes(baseString));
return Convert.ToBase64String(digest);
}
}
/// <summary>
/// Clones this instance.
/// </summary>
/// <returns>A new instance of the binding element.</returns>
protected override ITamperProtectionChannelBindingElement Clone() {
return new HmacSha1SigningBindingElement();
}
}
}
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