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//
// System.Reflection.StrongNameKeyPair.cs
//
// Authors:
// Kevin Winchester (kwin@ns.sympatico.ca)
// Sebastien Pouliot (sebastien@ximian.com)
//
// (C) 2002 Kevin Winchester
// 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.
//
using System.IO;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using Mono.Security;
using Mono.Security.Cryptography;
namespace System.Reflection {
#if NET_2_0
[ComVisible (true)]
#endif
[Serializable]
public class StrongNameKeyPair
{
private byte[] _publicKey;
private string _keyPairContainer;
private bool _keyPairExported;
private byte[] _keyPairArray;
[NonSerialized]
private RSA _rsa;
// note: we ask for UnmanagedCode because we do not want everyone
// to be able to generate strongnamed assemblies
[SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
public StrongNameKeyPair (byte[] keyPairArray)
{
if (keyPairArray == null)
throw new ArgumentNullException ("keyPairArray");
LoadKey (keyPairArray);
GetRSA ();
}
[SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
public StrongNameKeyPair (FileStream keyPairFile)
{
if (keyPairFile == null)
throw new ArgumentNullException ("keyPairFile");
byte[] input = new byte [keyPairFile.Length];
keyPairFile.Read (input, 0, input.Length);
LoadKey (input);
GetRSA ();
}
[SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
public StrongNameKeyPair (string keyPairContainer)
{
// named key container
if (keyPairContainer == null)
throw new ArgumentNullException ("keyPairContainer");
_keyPairContainer = keyPairContainer;
GetRSA ();
}
private RSA GetRSA ()
{
if (_rsa != null) return _rsa;
if (_keyPairArray != null) {
try {
_rsa = CryptoConvert.FromCapiKeyBlob (_keyPairArray);
}
catch {
// exception is thrown when getting PublicKey
// to match MS implementation
_keyPairArray = null;
}
}
else if (_keyPairContainer != null) {
CspParameters csp = new CspParameters ();
csp.KeyContainerName = _keyPairContainer;
_rsa = new RSACryptoServiceProvider (csp);
}
return _rsa;
}
private void LoadKey (byte[] key)
{
try {
// check for ECMA key
if (key.Length == 16) {
int i = 0;
int sum = 0;
while (i < key.Length)
sum += key [i++];
if (sum == 4) {
// it is the ECMA key
_publicKey = (byte[]) key.Clone ();
}
}
else
_keyPairArray = key;
}
catch
{
// exception is thrown when getting PublicKey
// to match MS implementation
}
}
public byte[] PublicKey {
get {
if (_publicKey == null) {
RSA rsa = GetRSA ();
// ECMA "key" is valid but doesn't produce a RSA instance
if (rsa == null)
throw new ArgumentException ("invalid keypair");
byte[] blob = CryptoConvert.ToCapiKeyBlob (rsa, false);
_publicKey = new byte [blob.Length + 12];
// The first 12 bytes are documented at:
// http://msdn.microsoft.com/library/en-us/cprefadd/html/grfungethashfromfile.asp
// ALG_ID - Signature
_publicKey[0] = 0x00;
_publicKey[1] = 0x24;
_publicKey[2] = 0x00;
_publicKey[3] = 0x00;
// ALG_ID - Hash
_publicKey[4] = 0x04;
_publicKey[5] = 0x80;
_publicKey[6] = 0x00;
_publicKey[7] = 0x00;
// Length of Public Key (in bytes)
int lastPart = blob.Length;
_publicKey[8] = (byte)(lastPart % 256);
_publicKey[9] = (byte)(lastPart / 256); // just in case
_publicKey[10] = 0x00;
_publicKey[11] = 0x00;
Buffer.BlockCopy (blob, 0, _publicKey, 12, blob.Length);
}
return _publicKey;
}
}
internal StrongName StrongName ()
{
RSA rsa = GetRSA ();
if (rsa != null)
return new StrongName (rsa);
if (_publicKey != null)
return new StrongName (_publicKey);
return null;
}
}
}
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