//
// System.Security.Policy.Hash
//
// Authors:
// Jackson Harper (Jackson@LatitudeGeo.com)
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2002 Jackson Harper, All rights reserved.
// Portions (C) 2002 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 !MOONLIGHT
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.Text;
namespace System.Security.Policy{
[Serializable]
[ComVisible (true)]
public sealed class Hash : ISerializable, IBuiltInEvidence {
private Assembly assembly;
private byte[] data;
internal byte[] _md5;
internal byte[] _sha1;
public Hash (Assembly assembly)
{
if (assembly == null)
throw new ArgumentNullException ("assembly");
this.assembly = assembly;
}
internal Hash ()
{
}
internal Hash (SerializationInfo info, StreamingContext context)
{
data = (byte[]) info.GetValue ("RawData", typeof (byte[]));
}
//
// Public Properties
//
public byte[] MD5 {
get {
// Case 1: we have a MD5 value - either precalculated or static (FX 2.0)
if (_md5 != null)
return _md5;
// Case 2: we don't have a MD5 value precalculated so we either
// (a): have an assembly reference - and can calculate the hash; or
// (b): have been initialized with a static MD5 value (FX 2.0)
if ((assembly == null) && (_sha1 != null)) {
string msg = Locale.GetText ("No assembly data. This instance was initialized with an MSHA1 digest value.");
throw new SecurityException (msg);
}
// fully named to avoid conflit between MD5 property and class name
HashAlgorithm hash = System.Security.Cryptography.MD5.Create ();
_md5 = GenerateHash (hash);
return _md5;
}
}
public byte[] SHA1 {
get {
// Case 1: we have a SHA1 value - either precalculated or static (FX 2.0)
if (_sha1 != null)
return _sha1;
// Case 2: we don't have a SHA1 value precalculated so we either
// (a): have an assembly reference - and can calculate the hash; or
// (b): have been initialized with a static MD5 value (FX 2.0)
if ((assembly == null) && (_md5 != null)) {
string msg = Locale.GetText ("No assembly data. This instance was initialized with an MD5 digest value.");
throw new SecurityException (msg);
}
// fully named to avoid conflit between SHA1 property and class name
HashAlgorithm hash = System.Security.Cryptography.SHA1.Create ();
_sha1 = GenerateHash (hash);
return _sha1;
}
}
//
// Public Methods
//
public byte[] GenerateHash (HashAlgorithm hashAlg)
{
if (hashAlg == null)
throw new ArgumentNullException ("hashAlg");
return hashAlg.ComputeHash (GetData ());
}
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException ("info");
info.AddValue ("RawData", GetData ());
}
public override string ToString ()
{
SecurityElement se = new SecurityElement (GetType ().FullName);
se.AddAttribute ("version", "1");
StringBuilder sb = new StringBuilder ();
byte[] raw = GetData ();
for (int i=0; i < raw.Length; i++)
sb.Append (raw [i].ToString ("X2"));
se.AddChild (new SecurityElement ("RawData", sb.ToString ()));
return se.ToString ();
}
//
// Private Methods
//
// FIXME: be more restrictive when imperative security is implemented
[FileIOPermission (SecurityAction.Assert, Unrestricted = true)]
private byte[] GetData ()
{
if ((assembly == null) && (data == null)) {
string msg = Locale.GetText ("No assembly data.");
throw new SecurityException (msg);
}
if (null == data) {
// TODO (Pre-Fx-2.0) we mustn't hash the complete assembly!
// ---- Look at ToString (MS version) for what to hash (and what not to)
// TODO we must drop the authenticode signature (if present)
FileStream stream = new
FileStream (assembly.Location, FileMode.Open, FileAccess.Read);
data = new byte [stream.Length];
stream.Read (data, 0, (int)stream.Length);
}
return data;
}
// interface IBuiltInEvidence
int IBuiltInEvidence.GetRequiredSize (bool verbose)
{
return (verbose ? 5 : 0); // as documented
}
[MonoTODO ("IBuiltInEvidence")]
int IBuiltInEvidence.InitFromBuffer (char [] buffer, int position)
{
return 0;
}
[MonoTODO ("IBuiltInEvidence")]
int IBuiltInEvidence.OutputToBuffer (char [] buffer, int position, bool verbose)
{
return 0;
}
static public Hash CreateMD5 (byte[] md5)
{
if (md5 == null)
throw new ArgumentNullException ("md5");
Hash h = new Hash ();
h._md5 = md5;
return h;
}
static public Hash CreateSHA1 (byte[] sha1)
{
if (sha1 == null)
throw new ArgumentNullException ("sha1");
Hash h = new Hash ();
h._sha1 = sha1;
return h;
}
}
}
#endif
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