/* * Copyright (C) 2020 Metrological Group B.V. * Copyright (C) 2020 Igalia S.L. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #if ENABLE(ENCRYPTED_MEDIA) #include "CDMClearKey.h" #include "CDMInstanceSession.h" #include "MediaPlayerPrivate.h" #include "SharedBuffer.h" #include <gcrypt.h> #include <wtf/Condition.h> #include <wtf/Optional.h> #include <wtf/VectorHash.h> namespace WebCore { class CDMProxyFactoryClearKey final : public CDMProxyFactory { WTF_MAKE_FAST_ALLOCATED; public: static CDMProxyFactoryClearKey& singleton(); ~CDMProxyFactoryClearKey() = default; private: friend class NeverDestroyed<CDMProxyFactoryClearKey>; CDMProxyFactoryClearKey() = default; RefPtr<CDMProxy> createCDMProxy(const String&) final; bool supportsKeySystem(const String&) final; }; // This is the thread-safe API that decode threads should use to make use of a // platform CDM module. class CDMProxyClearKey final : public CDMProxy, public CanMakeWeakPtr<CDMProxyClearKey, WeakPtrFactoryInitialization::Eager> { public: CDMProxyClearKey() = default; virtual ~CDMProxyClearKey(); // FIXME: There's a lack of consistency between SharedBuffers, // Vector<char>'s and {uint8_t*,size_t} idioms for representing a chunk of // bytes. Fix that somehow. Note SharedBuffers are dangerous since // they're not thread-safe and this class must maintain // thread-safety, but maybe SharedBuffer::DataSegment could be // made to work, however that has zero helpers for dropping into // iterator-aware / comparator-aware containers... struct cencDecryptContext { // FIXME: Enacapsulate these fields in non-copied types. const uint8_t* keyID; size_t keyIDSizeInBytes; const uint8_t* iv; size_t ivSizeInBytes; uint8_t* encryptedBuffer; size_t encryptedBufferSizeInBytes; // FIXME: GStreamer-specific data layout. // If we want to get rid of the specific data layout, we can parse it before // assigning it here and maybe have a Vector<size_t> that is a series of // clear/decrypted/clear/decrypted... Or maybe even a Vector<std::pair<size_t, size_t>> // representing sequences of clear/decrypted sizes. That std::pair could even // become a struct ClearDecryptedChunkSizesInBytes for example. // https://bugs.webkit.org/show_bug.cgi?id=206730 const uint8_t* subsamplesBuffer; size_t subsamplesBufferSizeInBytes; size_t numSubsamples; bool isSubsampled() const { return numSubsamples; } }; // FIXME: Unconditional in-place decryption. What about SVP? // FIXME: GStreamer-specific, in that the format of the subsample // data is defined by whatever qtdemux decides to do with it. bool cencDecrypt(cencDecryptContext&); private: gcry_cipher_hd_t& gCryptHandle(); // FIXME: For now we only support AES in CTR mode, in the future // we will surely have to support more protection schemes. Can we // reuse some Crypto APIs in WebCore? bool cencSetCounterVector(const cencDecryptContext&); bool cencSetDecryptionKey(const cencDecryptContext&); bool cencDecryptFullSample(cencDecryptContext&); bool cencDecryptSubsampled(cencDecryptContext&); void releaseDecryptionResources() final; void closeGCryptHandle(); // FIXME: It would be nice to use something in WebCore for crypto... Optional<gcry_cipher_hd_t> m_gCryptHandle { WTF::nullopt }; }; } // namespace WebCore #endif // ENABLE(ENCRYPTED_MEDIA)