//
// System.Security.Cryptography CryptoStream.cs
//
-// Author:
-// Thomas Neidhart (tome@sbox.tugraz.at)
-// Sebastien Pouliot (spouliot@motus.com)
+// Authors:
+// Thomas Neidhart (tome@sbox.tugraz.at)
+// Sebastien Pouliot (sebastien@ximian.com)
//
-// Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
+// Portions (C) 2002, 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.
//
-using System;
+using System.Globalization;
using System.IO;
+using System.Runtime.InteropServices;
namespace System.Security.Cryptography {
-public class CryptoStream : Stream {
- private Stream _stream;
- private ICryptoTransform _transform;
- private CryptoStreamMode _mode;
-
- public CryptoStream(Stream stream, ICryptoTransform transform, CryptoStreamMode mode)
- {
- _stream = stream;
- _transform = transform;
- _mode = mode;
- }
+#if NET_2_0
+ [ComVisible (true)]
+#endif
+ public class CryptoStream : Stream {
+ private Stream _stream;
+ private ICryptoTransform _transform;
+ private CryptoStreamMode _mode;
+ private byte[] _currentBlock;
+ private bool _disposed;
+ private bool _flushedFinalBlock;
+ private int _partialCount;
+ private bool _endOfStream;
- ~CryptoStream ()
- {
- Dispose (false);
- }
-
- public override bool CanRead {
- get { return (_mode == CryptoStreamMode.Read); }
- }
+ private byte[] _waitingBlock;
+ private int _waitingCount;
- public override bool CanSeek {
- get { return false; }
- }
+ private byte[] _transformedBlock;
+ private int _transformedPos;
+ private int _transformedCount;
- public override bool CanWrite {
- get { return (_mode == CryptoStreamMode.Write); }
- }
-
- public override long Length {
- get {
- throw new NotSupportedException("Length property not supported by CryptoStream");
+ private byte[] _workingBlock;
+ private int _workingCount;
+
+ public CryptoStream (Stream stream, ICryptoTransform transform, CryptoStreamMode mode)
+ {
+ if ((mode == CryptoStreamMode.Read) && (!stream.CanRead)) {
+ throw new ArgumentException (
+ Locale.GetText ("Can't read on stream"));
+ }
+ if ((mode == CryptoStreamMode.Write) && (!stream.CanWrite)) {
+ throw new ArgumentException (
+ Locale.GetText ("Can't write on stream"));
+ }
+ _stream = stream;
+ _transform = transform;
+ _mode = mode;
+ _disposed = false;
+ if (transform != null) {
+ _workingBlock = new byte [transform.InputBlockSize];
+ if (mode == CryptoStreamMode.Read)
+ _currentBlock = new byte [transform.InputBlockSize];
+ else if (mode == CryptoStreamMode.Write)
+ _currentBlock = new byte [transform.OutputBlockSize];
+ }
}
- }
- public override long Position {
- get {
- throw new NotSupportedException("Position property not supported by CryptoStream");
+ ~CryptoStream ()
+ {
+ Dispose (false);
}
- set {
- throw new NotSupportedException("Position property not supported by CryptoStream");
+
+ public override bool CanRead {
+ get { return (_mode == CryptoStreamMode.Read); }
}
- }
- public void Clear ()
- {
- Dispose (true);
- }
+ public override bool CanSeek {
+ get { return false; }
+ }
- [MonoTODO("Limited support for HMACSHA1")]
- public override void Close ()
- {
- if (_mode != CryptoStreamMode.Write)
- throw new NotSupportedException ();
- // TODO: limited implemention for HMACSHA1
- byte[] buffer = new byte [0];
- _transform.TransformFinalBlock (buffer, 0, 0);
- if (_stream != null)
- _stream.Close();
- }
+ public override bool CanWrite {
+ get { return (_mode == CryptoStreamMode.Write); }
+ }
+
+ public override long Length {
+ get { throw new NotSupportedException ("Length"); }
+ }
- [MonoTODO]
- public override int Read (byte[] buffer, int offset, int count)
- {
- if (_mode != CryptoStreamMode.Read)
- throw new NotSupportedException ();
- if ((offset < 0) || (count < 0))
- throw new ArgumentOutOfRangeException ();
- if (offset + count > buffer.Length)
- throw new ArgumentException ();
- // TODO: implement
- return 0;
- }
+ public override long Position {
+ get { throw new NotSupportedException ("Position"); }
+ set { throw new NotSupportedException ("Position"); }
+ }
- [MonoTODO("Limited support for HMACSHA1")]
- public override void Write (byte[] buffer, int offset, int count)
- {
- if (_mode != CryptoStreamMode.Write)
- throw new NotSupportedException ();
- if ((offset < 0) || (count < 0))
- throw new ArgumentOutOfRangeException ();
- if (offset + count > buffer.Length)
- throw new ArgumentException ();
- // TODO: limited implemention for HMACSHA1
- byte[] output = new byte [count];
- _transform.TransformBlock (buffer, offset, count, output, 0);
- }
+ public void Clear ()
+ {
+ Dispose (true);
+ GC.SuppressFinalize (this); // not called in Stream.Dispose
+ }
- [MonoTODO]
- public override void Flush ()
- {
- if (_mode != CryptoStreamMode.Write)
- throw new NotSupportedException ("cannot flush a non-writeable CryptoStream");
- // TODO: implement
- }
+ // LAMESPEC: A CryptoStream can be close in read mode
+ public override void Close ()
+ {
+ // only flush in write mode (bugzilla 46143)
+ if ((!_flushedFinalBlock) && (_mode == CryptoStreamMode.Write))
+ FlushFinalBlock ();
- [MonoTODO]
- public void FlushFinalBlock ()
- {
- if (_mode != CryptoStreamMode.Write)
- throw new NotSupportedException ("cannot flush a non-writeable CryptoStream");
- // TODO: implement
- }
+ if (_stream != null)
+ _stream.Close ();
+ }
- public override long Seek (long offset, SeekOrigin origin)
- {
- throw new NotSupportedException ("cannot Seek a CryptoStream");
- }
-
- // LAMESPEC: Exception NotSupportedException not documented
- public override void SetLength (long value)
- {
- throw new NotSupportedException ("cannot SetLength a CryptoStream");
- }
+ public override int Read ([In,Out] byte[] buffer, int offset, int count)
+ {
+ if (_mode != CryptoStreamMode.Read) {
+ throw new NotSupportedException (
+ Locale.GetText ("not in Read mode"));
+ }
+ if (offset < 0) {
+ throw new ArgumentOutOfRangeException ("offset",
+ Locale.GetText ("negative"));
+ }
+ if (count < 0) {
+ throw new ArgumentOutOfRangeException ("count",
+ Locale.GetText ("negative"));
+ }
+ // yes - buffer.Length will throw a NullReferenceException if buffer is null
+ // but by doing so we match MS implementation
+ // re-ordered to avoid integer overflow
+ if (offset > buffer.Length - count) {
+ throw new ArgumentException ("(offset+count)",
+ Locale.GetText ("buffer overflow"));
+ }
+ // for some strange reason ObjectDisposedException isn't throw
+ // instead we get a ArgumentNullException (probably from an internal method)
+ if (_workingBlock == null) {
+ throw new ArgumentNullException (
+ Locale.GetText ("object _disposed"));
+ }
+
+ int result = 0;
+ if ((count == 0) || ((_transformedPos == _transformedCount) && (_endOfStream)))
+ return result;
+
+ if (_waitingBlock == null) {
+ _transformedBlock = new byte [_transform.OutputBlockSize << 2];
+ _transformedPos = 0;
+ _transformedCount = 0;
+ _waitingBlock = new byte [_transform.InputBlockSize];
+ _waitingCount = _stream.Read (_waitingBlock, 0, _waitingBlock.Length);
+ }
+
+ while (count > 0) {
+ // transformed but not yet returned
+ int length = (_transformedCount - _transformedPos);
+
+ // need more data - at least one full block must be available if we haven't reach the end of the stream
+ if (length < _transform.InputBlockSize) {
+ int transformed = 0;
- protected virtual void Dispose (bool disposing)
- {
+ // load a new block
+ _workingCount = _stream.Read (_workingBlock, 0, _workingBlock.Length);
+ _endOfStream = (_workingCount < _transform.InputBlockSize);
+
+ if (!_endOfStream) {
+ // transform the waiting block
+ transformed = _transform.TransformBlock (_waitingBlock, 0, _waitingBlock.Length, _transformedBlock, _transformedCount);
+
+ // transfer temporary to waiting
+ Buffer.BlockCopy (_workingBlock, 0, _waitingBlock, 0, _workingCount);
+ _waitingCount = _workingCount;
+ }
+ else {
+ if (_workingCount > 0) {
+ // transform the waiting block
+ transformed = _transform.TransformBlock (_waitingBlock, 0, _waitingBlock.Length, _transformedBlock, _transformedCount);
+
+ // transfer temporary to waiting
+ Buffer.BlockCopy (_workingBlock, 0, _waitingBlock, 0, _workingCount);
+ _waitingCount = _workingCount;
+
+ length += transformed;
+ _transformedCount += transformed;
+ }
+ byte[] input = _transform.TransformFinalBlock (_waitingBlock, 0, _waitingCount);
+ transformed = input.Length;
+ Buffer.BlockCopy (input, 0, _transformedBlock, _transformedCount, input.Length);
+ // zeroize this last block
+ Array.Clear (input, 0, input.Length);
+ }
+
+ length += transformed;
+ _transformedCount += transformed;
+ }
+ // compaction
+ if (_transformedPos > _transform.InputBlockSize) {
+ Buffer.BlockCopy (_transformedBlock, _transformedPos, _transformedBlock, 0, length);
+ _transformedCount -= _transformedPos;
+ _transformedPos = 0;
+ }
+
+ length = ((count < length) ? count : length);
+ if (length > 0) {
+ Buffer.BlockCopy (_transformedBlock, _transformedPos, buffer, offset, length);
+ _transformedPos += length;
+
+ result += length;
+ offset += length;
+ count -= length;
+ }
+
+ // there may not be enough data in the stream for a
+ // complete block
+ if (((length != _transform.InputBlockSize) && (_waitingCount != _transform.InputBlockSize)) || (_endOfStream)) {
+ count = 0; // no more data can be read
+ }
+ }
+
+ return result;
+ }
+
+ public override void Write (byte[] buffer, int offset, int count)
+ {
+ if (_mode != CryptoStreamMode.Write) {
+ throw new NotSupportedException (
+ Locale.GetText ("not in Write mode"));
+ }
+ if (offset < 0) {
+ throw new ArgumentOutOfRangeException ("offset",
+ Locale.GetText ("negative"));
+ }
+ if (count < 0) {
+ throw new ArgumentOutOfRangeException ("count",
+ Locale.GetText ("negative"));
+ }
+ // re-ordered to avoid integer overflow
+ if (offset > buffer.Length - count) {
+ throw new ArgumentException ("(offset+count)",
+ Locale.GetText ("buffer overflow"));
+ }
+
+ // partial block (in progress)
+ if ((_partialCount > 0) && (_partialCount != _transform.InputBlockSize)) {
+ int remainder = _transform.InputBlockSize - _partialCount;
+ remainder = ((count < remainder) ? count : remainder);
+ Buffer.BlockCopy (buffer, offset, _workingBlock, _partialCount, remainder);
+ _partialCount += remainder;
+ offset += remainder;
+ count -= remainder;
+ }
+
+ int bufferPos = offset;
+ while (count > 0) {
+ if (_partialCount == _transform.InputBlockSize) {
+ // use partial block to avoid (re)allocation
+ int len = _transform.TransformBlock (_workingBlock, 0, _partialCount, _currentBlock, 0);
+ _stream.Write (_currentBlock, 0, len);
+ // reset
+ _partialCount = 0;
+ }
+
+ if (_transform.CanTransformMultipleBlocks) {
+ // transform all except the last block (which may be the last block
+ // of the stream and require TransformFinalBlock)
+ int numBlock = ((_partialCount + count) / _transform.InputBlockSize);
+ int multiSize = (numBlock * _transform.InputBlockSize);
+ if (numBlock > 0) {
+ byte[] multiBlocks = new byte [multiSize];
+ int len = _transform.TransformBlock (buffer, offset, multiSize, multiBlocks, 0);
+ _stream.Write (multiBlocks, 0, len);
+ // copy last block into _currentBlock
+ _partialCount = count - multiSize;
+ Buffer.BlockCopy (buffer, offset + multiSize, _workingBlock, 0, _partialCount);
+ }
+ else {
+ Buffer.BlockCopy (buffer, offset, _workingBlock, _partialCount, count);
+ _partialCount += count;
+ }
+ count = 0; // the last block, if any, is in _workingBlock
+ }
+ else {
+ int len = Math.Min (_transform.InputBlockSize - _partialCount, count);
+ Buffer.BlockCopy (buffer, bufferPos, _workingBlock, _partialCount, len);
+ bufferPos += len;
+ _partialCount += len;
+ count -= len;
+ // here block may be full, but we wont TransformBlock it until next iteration
+ // so that the last block will be called in FlushFinalBlock using TransformFinalBlock
+ }
+ }
+ }
+
+ public override void Flush ()
+ {
+ if (_stream != null)
+ _stream.Flush ();
+ }
+
+ public void FlushFinalBlock ()
+ {
+ if (_flushedFinalBlock) {
+ throw new NotSupportedException (
+ Locale.GetText ("This method cannot be called twice."));
+ }
+ if (_mode != CryptoStreamMode.Write) {
+ throw new NotSupportedException (
+ Locale.GetText ("cannot flush a non-writeable CryptoStream"));
+ }
+
+ _flushedFinalBlock = true;
+ byte[] finalBuffer = _transform.TransformFinalBlock (_workingBlock, 0, _partialCount);
+ if (_stream != null) {
+ _stream.Write (finalBuffer, 0, finalBuffer.Length);
+ if (_stream is CryptoStream) {
+ // for cascading crypto streams
+ (_stream as CryptoStream).FlushFinalBlock ();
+ }
+ _stream.Flush ();
+ }
+ // zeroize
+ Array.Clear (finalBuffer, 0, finalBuffer.Length);
+ }
+
+ public override long Seek (long offset, SeekOrigin origin)
+ {
+ throw new NotSupportedException ("Seek");
+ }
+
+ // LAMESPEC: Exception NotSupportedException not documented
+ public override void SetLength (long value)
+ {
+ throw new NotSupportedException ("SetLength");
+ }
+
+#if NET_2_0
+ protected override void Dispose (bool disposing)
+#else
+ protected virtual void Dispose (bool disposing)
+#endif
+ {
+ if (!_disposed) {
+ _disposed = true;
+ // always cleared for security reason
+ if (_workingBlock != null)
+ Array.Clear (_workingBlock, 0, _workingBlock.Length);
+ if (_currentBlock != null)
+ Array.Clear (_currentBlock, 0, _currentBlock.Length);
+ if (disposing) {
+ _stream = null;
+ _workingBlock = null;
+ _currentBlock = null;
+ }
+ }
+ }
}
-
-} // CryptoStream
-
-} // System.Security.Cryptography
+}
projects / mono.git / blobdiff