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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
**
**
**
**
** Purpose: Encapsulate access to a public/private key pair
** used to sign strong name assemblies.
**
**
===========================================================*/
namespace System.Reflection
{
using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security;
using System.Security.Permissions;
using System.Runtime.Versioning;
using Microsoft.Win32;
using System.Diagnostics.Contracts;
#if !FEATURE_CORECLR
using Microsoft.Runtime.Hosting;
#endif
#if FEATURE_CORECLR
// Dummy type to avoid ifdefs in signature definitions
public class StrongNameKeyPair
{
private StrongNameKeyPair()
{
throw new NotSupportedException();
}
}
#else
#if FEATURE_SERIALIZATION
[Serializable]
#endif
[System.Runtime.InteropServices.ComVisible(true)]
public class StrongNameKeyPair : IDeserializationCallback, ISerializable
{
private bool _keyPairExported;
private byte[] _keyPairArray;
private String _keyPairContainer;
private byte[] _publicKey;
// Build key pair from file.
[System.Security.SecuritySafeCritical] // auto-generated
#pragma warning disable 618
[SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)]
#pragma warning restore 618
public StrongNameKeyPair(FileStream keyPairFile)
{
if (keyPairFile == null)
throw new ArgumentNullException("keyPairFile");
Contract.EndContractBlock();
int length = (int)keyPairFile.Length;
_keyPairArray = new byte[length];
keyPairFile.Read(_keyPairArray, 0, length);
_keyPairExported = true;
}
// Build key pair from byte array in memory.
[System.Security.SecuritySafeCritical] // auto-generated
#pragma warning disable 618
[SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)]
#pragma warning restore 618
public StrongNameKeyPair(byte[] keyPairArray)
{
if (keyPairArray == null)
throw new ArgumentNullException("keyPairArray");
Contract.EndContractBlock();
_keyPairArray = new byte[keyPairArray.Length];
Array.Copy(keyPairArray, _keyPairArray, keyPairArray.Length);
_keyPairExported = true;
}
// Reference key pair in named key container.
[System.Security.SecuritySafeCritical] // auto-generated
#pragma warning disable 618
[SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)]
#pragma warning restore 618
public StrongNameKeyPair(String keyPairContainer)
{
if (keyPairContainer == null)
throw new ArgumentNullException("keyPairContainer");
Contract.EndContractBlock();
_keyPairContainer = keyPairContainer;
_keyPairExported = false;
}
[System.Security.SecuritySafeCritical] // auto-generated
#pragma warning disable 618
[SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)]
#pragma warning restore 618
protected StrongNameKeyPair (SerializationInfo info, StreamingContext context) {
_keyPairExported = (bool) info.GetValue("_keyPairExported", typeof(bool));
_keyPairArray = (byte[]) info.GetValue("_keyPairArray", typeof(byte[]));
_keyPairContainer = (string) info.GetValue("_keyPairContainer", typeof(string));
_publicKey = (byte[]) info.GetValue("_publicKey", typeof(byte[]));
}
// Get the public portion of the key pair.
public byte[] PublicKey
{
[System.Security.SecuritySafeCritical] // auto-generated
get
{
if (_publicKey == null)
{
_publicKey = ComputePublicKey();
}
byte[] publicKey = new byte[_publicKey.Length];
Array.Copy(_publicKey, publicKey, _publicKey.Length);
return publicKey;
}
}
[System.Security.SecurityCritical] // auto-generated
private unsafe byte[] ComputePublicKey()
{
byte[] publicKey = null;
// Make sure pbPublicKey is not leaked with async exceptions
RuntimeHelpers.PrepareConstrainedRegions();
try {
}
finally
{
IntPtr pbPublicKey = IntPtr.Zero;
int cbPublicKey = 0;
try
{
bool result;
if (_keyPairExported)
{
result = StrongNameHelpers.StrongNameGetPublicKey(null, _keyPairArray, _keyPairArray.Length,
out pbPublicKey, out cbPublicKey);
}
else
{
result = StrongNameHelpers.StrongNameGetPublicKey(_keyPairContainer, null, 0,
out pbPublicKey, out cbPublicKey);
}
if (!result)
throw new ArgumentException(Environment.GetResourceString("Argument_StrongNameGetPublicKey"));
publicKey = new byte[cbPublicKey];
Buffer.Memcpy(publicKey, 0, (byte*)(pbPublicKey.ToPointer()), 0, cbPublicKey);
}
finally
{
if (pbPublicKey != IntPtr.Zero)
StrongNameHelpers.StrongNameFreeBuffer(pbPublicKey);
}
}
return publicKey;
}
#if FEATURE_SERIALIZATION
/// <internalonly/>
[System.Security.SecurityCritical]
void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context) {
info.AddValue("_keyPairExported", _keyPairExported);
info.AddValue("_keyPairArray", _keyPairArray);
info.AddValue("_keyPairContainer", _keyPairContainer);
info.AddValue("_publicKey", _publicKey);
}
/// <internalonly/>
void IDeserializationCallback.OnDeserialization (Object sender) {}
#endif
// Internal routine used to retrieve key pair info from unmanaged code.
private bool GetKeyPair(out Object arrayOrContainer)
{
arrayOrContainer = _keyPairExported ? (Object)_keyPairArray : (Object)_keyPairContainer;
return _keyPairExported;
}
}
#endif // FEATURE_CORECLR
}
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