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//-----------------------------------------------------------------------
// <copyright file="RsaSha1ServiceProviderSigningBindingElement.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth.ChannelElements {
using System;
using System.Diagnostics.CodeAnalysis;
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>
[SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Sha", Justification = "Acronym")]
public class RsaSha1ServiceProviderSigningBindingElement : RsaSha1SigningBindingElement {
/// <summary>
/// The token manager for the service provider.
/// </summary>
private IServiceProviderTokenManager tokenManager;
/// <summary>
/// Initializes a new instance of the <see cref="RsaSha1ServiceProviderSigningBindingElement"/> class.
/// </summary>
/// <param name="tokenManager">The token manager.</param>
public RsaSha1ServiceProviderSigningBindingElement(IServiceProviderTokenManager tokenManager) {
Requires.NotNull(tokenManager, "tokenManager");
this.tokenManager = tokenManager;
}
/// <summary>
/// Determines whether the signature on some message is valid.
/// </summary>
/// <param name="message">The message to check the signature on.</param>
/// <returns>
/// <c>true</c> if the signature on the message is valid; otherwise, <c>false</c>.
/// </returns>
protected override bool IsSignatureValid(ITamperResistantOAuthMessage message) {
ErrorUtilities.VerifyInternal(this.tokenManager != null, "No token manager available for fetching Consumer public certificates.");
string signatureBaseString = ConstructSignatureBaseString(message, this.Channel.MessageDescriptions.GetAccessor(message));
byte[] data = Encoding.ASCII.GetBytes(signatureBaseString);
byte[] carriedSignature = Convert.FromBase64String(message.Signature);
X509Certificate2 cert = this.tokenManager.GetConsumer(message.ConsumerKey).Certificate;
if (cert == null) {
Logger.Signatures.WarnFormat("Incoming message from consumer '{0}' could not be matched with an appropriate X.509 certificate for signature verification.", message.ConsumerKey);
return false;
}
var provider = (RSACryptoServiceProvider)cert.PublicKey.Key;
bool valid = provider.VerifyData(data, "SHA1", carriedSignature);
return valid;
}
/// <summary>
/// Calculates a signature for a given message.
/// </summary>
/// <param name="message">The message to sign.</param>
/// <returns>
/// The signature for the message.
/// </returns>
protected override string GetSignature(ITamperResistantOAuthMessage message) {
throw new NotImplementedException();
}
/// <summary>
/// Clones this instance.
/// </summary>
/// <returns>
/// A new instance of the binding element.
/// </returns>
protected override ITamperProtectionChannelBindingElement Clone() {
return new RsaSha1ServiceProviderSigningBindingElement(this.tokenManager);
}
}
}
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