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//
// ProtectedData.cs: Protect (encrypt) data without (user involved) key management
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.Runtime.InteropServices;
using System.Security.Permissions;
using Mono.Security.Cryptography;
namespace System.Security.Cryptography {
// References:
// a. Windows Data Protection
// http://msdn.microsoft.com/library/en-us/dnsecure/html/windataprotection-dpapi.asp?frame=true
public sealed class ProtectedData {
private ProtectedData ()
{
}
// FIXME [DataProtectionPermission (SecurityAction.Demand, ProtectData = true)]
public static byte[] Protect (byte[] userData, byte[] optionalEntropy, DataProtectionScope scope)
{
if (userData == null)
throw new ArgumentNullException ("userData");
// on Windows this is supported only under 2000 and later OS
Check (scope);
switch (impl) {
case DataProtectionImplementation.ManagedProtection:
try {
return ManagedProtection.Protect (userData, optionalEntropy, scope);
}
catch (Exception e) {
string msg = Locale.GetText ("Data protection failed.");
throw new CryptographicException (msg, e);
}
case DataProtectionImplementation.Win32CryptoProtect:
try {
return NativeDapiProtection.Protect (userData, optionalEntropy, scope);
}
catch (Exception e) {
string msg = Locale.GetText ("Data protection failed.");
throw new CryptographicException (msg, e);
}
default:
throw new PlatformNotSupportedException ();
}
}
// FIXME [DataProtectionPermission (SecurityAction.Demand, UnprotectData = true)]
public static byte[] Unprotect (byte[] encryptedData, byte[] optionalEntropy, DataProtectionScope scope)
{
if (encryptedData == null)
throw new ArgumentNullException ("encryptedData");
// on Windows this is supported only under 2000 and later OS
Check (scope);
switch (impl) {
case DataProtectionImplementation.ManagedProtection:
try {
return ManagedProtection.Unprotect (encryptedData, optionalEntropy, scope);
}
catch (Exception e) {
string msg = Locale.GetText ("Data unprotection failed.");
throw new CryptographicException (msg, e);
}
case DataProtectionImplementation.Win32CryptoProtect:
try {
return NativeDapiProtection.Unprotect (encryptedData, optionalEntropy, scope);
}
catch (Exception e) {
string msg = Locale.GetText ("Data unprotection failed.");
throw new CryptographicException (msg, e);
}
default:
throw new PlatformNotSupportedException ();
}
}
// private stuff
enum DataProtectionImplementation {
Unknown,
Win32CryptoProtect,
ManagedProtection,
Unsupported = Int32.MinValue
}
private static DataProtectionImplementation impl;
private static void Detect ()
{
OperatingSystem os = Environment.OSVersion;
switch (os.Platform) {
case PlatformID.Win32NT:
Version v = os.Version;
if (v.Major < 5) {
impl = DataProtectionImplementation.Unsupported;
} else {
// Windows 2000 (5.0) and later
impl = DataProtectionImplementation.Win32CryptoProtect;
}
break;
case PlatformID.Unix:
impl = DataProtectionImplementation.ManagedProtection;
break;
default:
impl = DataProtectionImplementation.Unsupported;
break;
}
}
private static void Check (DataProtectionScope scope)
{
if ((scope < DataProtectionScope.CurrentUser) || (scope > DataProtectionScope.LocalMachine)) {
string msg = Locale.GetText ("Invalid enum value '{0}' for '{1}'.",
scope, "DataProtectionScope");
throw new ArgumentException (msg, "scope");
}
switch (impl) {
case DataProtectionImplementation.Unknown:
Detect ();
break;
case DataProtectionImplementation.Unsupported:
throw new PlatformNotSupportedException ();
}
}
}
}
#endif
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