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//-----------------------------------------------------------------------
// <copyright file="StandardTokenGenerator.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOAuth.OAuth.ChannelElements {
using System;
using System.Security.Cryptography;
/// <summary>
/// A cryptographically strong random string generator for tokens and secrets.
/// </summary>
internal class StandardTokenGenerator : ITokenGenerator {
/// <summary>
/// The cryptographically strong random string generator for tokens and secrets.
/// </summary>
private RandomNumberGenerator cryptoProvider = new RNGCryptoServiceProvider();
#region ITokenGenerator Members
/// <summary>
/// Generates a new token to represent a not-yet-authorized request to access protected resources.
/// </summary>
/// <param name="consumerKey">The consumer that requested this token.</param>
/// <returns>The newly generated token.</returns>
/// <remarks>
/// This method should not store the newly generated token in any persistent store.
/// This will be done in <see cref="ITokenManager.StoreNewRequestToken"/>.
/// </remarks>
public string GenerateRequestToken(string consumerKey) {
return this.GenerateCryptographicallyStrongString();
}
/// <summary>
/// Generates a new token to represent an authorized request to access protected resources.
/// </summary>
/// <param name="consumerKey">The consumer that requested this token.</param>
/// <returns>The newly generated token.</returns>
/// <remarks>
/// This method should not store the newly generated token in any persistent store.
/// This will be done in <see cref="ITokenManager.ExpireRequestTokenAndStoreNewAccessToken"/>.
/// </remarks>
public string GenerateAccessToken(string consumerKey) {
return this.GenerateCryptographicallyStrongString();
}
/// <summary>
/// Returns a cryptographically strong random string for use as a token secret.
/// </summary>
/// <returns>The generated string.</returns>
public string GenerateSecret() {
return this.GenerateCryptographicallyStrongString();
}
#endregion
/// <summary>
/// Returns a new random string.
/// </summary>
/// <returns>The new random string.</returns>
private string GenerateCryptographicallyStrongString() {
byte[] buffer = new byte[20];
this.cryptoProvider.GetBytes(buffer);
return Convert.ToBase64String(buffer);
}
}
}
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