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//-----------------------------------------------------------------------
// <copyright file="RsaSha1ConsumerSigningBindingElement.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="RsaSha1ConsumerSigningBindingElement"/> 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; }
/// <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) {
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;
}
/// <summary>
/// Creates a new object that is a copy of the current instance.
/// </summary>
/// <returns>
/// A new object that is a copy of this instance.
/// </returns>
protected override ITamperProtectionChannelBindingElement Clone() {
return new RsaSha1ConsumerSigningBindingElement(this.SigningCertificate);
}
}
}
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