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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.
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace System.Security
{
public sealed partial class SecureString : IDisposable
{
private const int MaxLength = 65536;
private readonly object _methodLock = new object();
private bool _readOnly;
private int _decryptedLength;
public unsafe SecureString()
{
InitializeSecureString(null, 0);
}
[CLSCompliant(false)]
public unsafe SecureString(char* value, int length)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (length > MaxLength)
{
throw new ArgumentOutOfRangeException(nameof(length), SR.ArgumentOutOfRange_Length);
}
InitializeSecureString(value, length);
}
public int Length
{
get
{
lock (_methodLock)
{
EnsureNotDisposed();
return _decryptedLength;
}
}
}
public void AppendChar(char c)
{
lock (_methodLock)
{
EnsureNotDisposed();
EnsureNotReadOnly();
AppendCharCore(c);
}
}
// clears the current contents. Only available if writable
public void Clear()
{
lock (_methodLock)
{
EnsureNotDisposed();
EnsureNotReadOnly();
ClearCore();
}
}
// Do a deep-copy of the SecureString
public SecureString Copy()
{
lock (_methodLock)
{
EnsureNotDisposed();
return new SecureString(this);
}
}
public void Dispose()
{
lock (_methodLock)
{
DisposeCore();
}
}
public void InsertAt(int index, char c)
{
lock (_methodLock)
{
if (index < 0 || index > _decryptedLength)
{
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexString);
}
EnsureNotDisposed();
EnsureNotReadOnly();
InsertAtCore(index, c);
}
}
public bool IsReadOnly()
{
lock (_methodLock)
{
EnsureNotDisposed();
return _readOnly;
}
}
public void MakeReadOnly()
{
lock (_methodLock)
{
EnsureNotDisposed();
_readOnly = true;
}
}
public void RemoveAt(int index)
{
lock (_methodLock)
{
EnsureNotDisposed();
EnsureNotReadOnly();
if (index < 0 || index >= _decryptedLength)
{
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexString);
}
RemoveAtCore(index);
}
}
public void SetAt(int index, char c)
{
lock (_methodLock)
{
if (index < 0 || index >= _decryptedLength)
{
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexString);
}
Debug.Assert(index <= Int32.MaxValue / sizeof(char));
EnsureNotDisposed();
EnsureNotReadOnly();
SetAtCore(index, c);
}
}
private void EnsureNotReadOnly()
{
if (_readOnly)
{
throw new InvalidOperationException(SR.InvalidOperation_ReadOnly);
}
}
internal unsafe IntPtr MarshalToString(bool globalAlloc, bool unicode)
{
lock (_methodLock)
{
EnsureNotDisposed();
return MarshalToStringCore(globalAlloc, unicode);
}
}
private static void MarshalFree(IntPtr ptr, bool globalAlloc)
{
if (globalAlloc)
{
Marshal.FreeHGlobal(ptr);
}
else
{
Marshal.FreeCoTaskMem(ptr);
}
}
}
}
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