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108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_quota_EncryptingOutputStream_h
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#define mozilla_dom_quota_EncryptingOutputStream_h
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// Local includes
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#include "EncryptedBlock.h" // for EncryptedBlock
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// Global includes
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#include <cstddef>
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#include <cstdint>
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#include "ErrorList.h"
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#include "mozilla/InitializedOnce.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/NotNull.h"
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#include "nsCOMPtr.h"
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#include "nsIOutputStream.h"
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#include "nsISupports.h"
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#include "nsTArray.h"
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#include "nscore.h"
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class nsIInputStream;
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class nsIRandomGenerator;
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namespace mozilla::dom::quota {
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class EncryptingOutputStreamBase : public nsIOutputStream {
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_IMETHOD Write(const char* aBuf, uint32_t aCount, uint32_t* _retval) final;
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NS_IMETHOD WriteFrom(nsIInputStream* aFromStream, uint32_t aCount,
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uint32_t* _retval) final;
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NS_IMETHOD IsNonBlocking(bool* _retval) final;
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protected:
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EncryptingOutputStreamBase(nsCOMPtr<nsIOutputStream> aBaseStream,
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size_t aBlockSize);
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virtual ~EncryptingOutputStreamBase() = default;
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nsresult WriteAll(const char* aBuf, uint32_t aCount,
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uint32_t* aBytesWrittenOut);
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InitializedOnce<const NotNull<nsCOMPtr<nsIOutputStream>>> mBaseStream;
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const size_t mBlockSize;
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};
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// Wraps another nsIOutputStream using the CipherStrategy to encrypt it a
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// page-based manner. Essentially, the CipherStrategy is not actually
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// necessarily doing encryption, but any transformation to a page requiring some
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// fixed-size reserved size per page.
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//
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// Paired with DecryptingInputStream which can be used to read the data written
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// to the underlying stream, using the same (or more generally, a compatible)
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// CipherStrategy, when created with the same key (assuming a symmetric cipher
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// is being used; in principle, an asymmetric cipher would probably also work).
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template <typename CipherStrategy>
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class EncryptingOutputStream final : public EncryptingOutputStreamBase {
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public:
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// Construct a new blocking output stream to encrypt data to
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// the given base stream. The base stream must also be blocking.
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// The encryption block size may optionally be set to a value
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// up to kMaxBlockSize.
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explicit EncryptingOutputStream(nsCOMPtr<nsIOutputStream> aBaseStream,
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size_t aBlockSize,
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typename CipherStrategy::KeyType aKey);
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private:
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~EncryptingOutputStream();
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nsresult FlushToBaseStream();
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bool EnsureBuffers();
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CipherStrategy mCipherStrategy;
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// Buffer holding copied plain data. This must be copied here
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// so that the encryption can be performed on a single flat buffer.
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// XXX This is only necessary if the data written doesn't contain a portion of
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// effective block size at a block boundary.
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nsTArray<uint8_t> mBuffer;
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nsCOMPtr<nsIRandomGenerator> mRandomGenerator;
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// The next byte in the plain data to copy incoming data to.
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size_t mNextByte = 0;
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// Buffer holding the resulting encrypted data.
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using EncryptedBlockType = EncryptedBlock<CipherStrategy::BlockPrefixLength,
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CipherStrategy::BasicBlockSize>;
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Maybe<EncryptedBlockType> mEncryptedBlock;
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public:
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NS_IMETHOD Close() override;
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NS_IMETHOD Flush() override;
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NS_IMETHOD StreamStatus() override;
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NS_IMETHOD WriteSegments(nsReadSegmentFun aReader, void* aClosure,
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uint32_t aCount, uint32_t* _retval) override;
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};
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} // namespace mozilla::dom::quota
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#endif
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