136 lines
4.0 KiB
C#
136 lines
4.0 KiB
C#
//
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// ProtectedData.cs: Protect (encrypt) data without (user involved) key management
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//
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// Author:
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// Sebastien Pouliot <sebastien@ximian.com>
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//
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// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Runtime.InteropServices;
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using System.Security.Permissions;
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using Mono.Security.Cryptography;
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namespace System.Security.Cryptography {
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// References:
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// a. Windows Data Protection
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// http://msdn.microsoft.com/library/en-us/dnsecure/html/windataprotection-dpapi.asp?frame=true
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public sealed class ProtectedData {
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private ProtectedData ()
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{
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}
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// FIXME [DataProtectionPermission (SecurityAction.Demand, ProtectData = true)]
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public static byte[] Protect (byte[] userData, byte[] optionalEntropy, DataProtectionScope scope)
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{
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if (userData == null)
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throw new ArgumentNullException ("userData");
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// on Windows this is supported by CoreFX implementation
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Check (scope);
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switch (impl) {
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#if !MOBILE
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case DataProtectionImplementation.ManagedProtection:
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try {
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return ManagedProtection.Protect (userData, optionalEntropy, scope);
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}
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catch (Exception e) {
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string msg = Locale.GetText ("Data protection failed.");
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throw new CryptographicException (msg, e);
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}
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#endif
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default:
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throw new PlatformNotSupportedException ();
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}
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}
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// FIXME [DataProtectionPermission (SecurityAction.Demand, UnprotectData = true)]
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public static byte[] Unprotect (byte[] encryptedData, byte[] optionalEntropy, DataProtectionScope scope)
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{
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if (encryptedData == null)
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throw new ArgumentNullException ("encryptedData");
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// on Windows this is supported by CoreFX implementation
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Check (scope);
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switch (impl) {
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#if !MOBILE
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case DataProtectionImplementation.ManagedProtection:
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try {
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return ManagedProtection.Unprotect (encryptedData, optionalEntropy, scope);
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}
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catch (Exception e) {
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string msg = Locale.GetText ("Data unprotection failed.");
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throw new CryptographicException (msg, e);
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}
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#endif
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default:
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throw new PlatformNotSupportedException ();
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}
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}
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// private stuff
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enum DataProtectionImplementation {
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Unknown,
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Win32CryptoProtect,
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ManagedProtection,
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Unsupported = Int32.MinValue
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}
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private static DataProtectionImplementation impl;
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private static void Detect ()
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{
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OperatingSystem os = Environment.OSVersion;
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switch (os.Platform) {
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case PlatformID.Unix:
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impl = DataProtectionImplementation.ManagedProtection;
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break;
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case PlatformID.Win32NT:
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default:
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impl = DataProtectionImplementation.Unsupported;
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break;
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}
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}
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private static void Check (DataProtectionScope scope)
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{
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switch (impl) {
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case DataProtectionImplementation.Unknown:
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Detect ();
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break;
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case DataProtectionImplementation.Unsupported:
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throw new PlatformNotSupportedException ();
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}
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}
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}
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}
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