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//-----------------------------------------------------------------------
// <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 RsaSha1SigningBindingElement : SigningBindingElementBase {
/// <summary>
/// The name of the hash algorithm to use.
/// </summary>
private const string HashAlgorithmName = "RSA-SHA1";
/// <summary>
/// The token manager for the service provider.
/// </summary>
private IServiceProviderTokenManager tokenManager;
/// <summary>
/// Initializes a new instance of the <see cref="RsaSha1SigningBindingElement"/> class
/// for use by Consumers.
/// </summary>
/// <param name="signingCertificate">The certificate used to sign outgoing messages.</param>
public RsaSha1SigningBindingElement(X509Certificate2 signingCertificate)
: base(HashAlgorithmName) {
Contract.Requires<ArgumentNullException>(signingCertificate != null);
this.SigningCertificate = signingCertificate;
}
/// <summary>
/// Initializes a new instance of the <see cref="RsaSha1SigningBindingElement"/> class
/// for use by Service Providers.
/// </summary>
/// <param name="tokenManager">The token manager.</param>
public RsaSha1SigningBindingElement(IServiceProviderTokenManager tokenManager)
: base(HashAlgorithmName) {
Contract.Requires<ArgumentNullException>(tokenManager != null);
this.tokenManager = tokenManager;
}
/// <summary>
/// Gets or sets the certificate used to sign outgoing messages. Used only by Consumers.
/// </summary>
public X509Certificate2 SigningCertificate { get; set; }
/// <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>
/// 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>
/// Clones this instance.
/// </summary>
/// <returns>A new instance of the binding element.</returns>
protected override ITamperProtectionChannelBindingElement Clone() {
if (this.tokenManager != null) {
return new RsaSha1SigningBindingElement(this.tokenManager);
} else {
return new RsaSha1SigningBindingElement(this.SigningCertificate);
}
}
}
}
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