87 lines
2.6 KiB
C#
87 lines
2.6 KiB
C#
8 years ago
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//
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// MonoDataProtector.cs
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//
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// Author:
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// Paul Schneider <paul@pschneider.fr>
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//
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// Copyright (c) 2016 GNU GPL
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System;
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using System.Security.Cryptography;
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using System.IO;
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using Microsoft.AspNet.DataProtection;
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using System.Linq;
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namespace Yavsc.Auth
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{
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public class MonoDataProtector : IDataProtector
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{
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8 years ago
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private const string PRIMARY_PURPOSE = "IDataProtector";
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8 years ago
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private readonly string appName;
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private readonly DataProtectionScope dataProtectionScope;
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private readonly string[] purposes;
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public MonoDataProtector(string appName, string[] purposes)
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{
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if (appName == null) { throw new ArgumentNullException("appName"); }
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if (purposes == null) { throw new ArgumentNullException("purposes"); }
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this.appName = appName;
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this.purposes = purposes;
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this.dataProtectionScope = DataProtectionScope.CurrentUser;
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}
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public IDataProtector CreateProtector(string purpose)
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{
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if (purposes.Contains(purpose))
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return new MonoDataProtector(appName,new string[] {purpose});
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return new MonoDataProtector(appName,new string[] {});
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}
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public byte[] Protect(byte[] userData)
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{
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return ProtectedData.Protect(userData, this.GetEntropy(), dataProtectionScope);
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}
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public byte[] Unprotect(byte[] protectedData)
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{
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return ProtectedData.Unprotect(protectedData, this.GetEntropy(), dataProtectionScope);
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}
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private byte[] GetEntropy()
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{
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using (SHA256 sha256 = SHA256.Create())
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{
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using (MemoryStream memoryStream = new MemoryStream())
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using (CryptoStream cryptoStream = new CryptoStream(memoryStream, sha256, CryptoStreamMode.Write))
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using (StreamWriter writer = new StreamWriter(cryptoStream))
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{
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writer.Write(this.appName);
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writer.Write(PRIMARY_PURPOSE);
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foreach (string purpose in this.purposes)
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{
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writer.Write(purpose);
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}
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}
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return sha256.Hash;
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}
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}
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}
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}
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