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/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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(WEB_RTC)
#include "ExceptionOr.h"
#include "RTCRtpTransformBackend.h"
#include <wtf/Lock.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace WebCore {
class CryptoKey;
class RTCRtpSFrameTransformer : public ThreadSafeRefCounted<RTCRtpSFrameTransformer, WTF::DestructionThread::Main> {
public:
enum class CompatibilityMode { None, H264, VP8 };
WEBCORE_EXPORT static Ref<RTCRtpSFrameTransformer> create(CompatibilityMode = CompatibilityMode::None);
WEBCORE_EXPORT ~RTCRtpSFrameTransformer();
void setIsEncrypting(bool);
void setAuthenticationSize(uint64_t);
void setMediaType(RTCRtpTransformBackend::MediaType);
WEBCORE_EXPORT ExceptionOr<void> setEncryptionKey(const Vector<uint8_t>& rawKey, std::optional<uint64_t>);
enum class Error { KeyID, Authentication, Syntax, Other };
struct ErrorInformation {
Error error;
String message;
uint64_t keyId { 0 };
};
using TransformResult = Expected<Vector<uint8_t>, ErrorInformation>;
WEBCORE_EXPORT TransformResult transform(std::span<const uint8_t>);
const Vector<uint8_t>& authenticationKey() const { return m_authenticationKey; }
const Vector<uint8_t>& encryptionKey() const { return m_encryptionKey; }
const Vector<uint8_t>& saltKey() const { return m_saltKey; }
uint64_t keyId() const { return m_keyId; }
uint64_t counter() const { return m_counter; }
void setCounter(uint64_t counter) { m_counter = counter; }
bool hasKey(uint64_t) const;
private:
WEBCORE_EXPORT explicit RTCRtpSFrameTransformer(CompatibilityMode);
TransformResult decryptFrame(std::span<const uint8_t>);
TransformResult encryptFrame(std::span<const uint8_t>);
enum class ShouldUpdateKeys : bool { No, Yes };
ExceptionOr<void> updateEncryptionKey(const Vector<uint8_t>& rawKey, std::optional<uint64_t>, ShouldUpdateKeys = ShouldUpdateKeys::Yes) WTF_REQUIRES_LOCK(m_keyLock);
ExceptionOr<Vector<uint8_t>> computeSaltKey(const Vector<uint8_t>&);
ExceptionOr<Vector<uint8_t>> computeAuthenticationKey(const Vector<uint8_t>&);
ExceptionOr<Vector<uint8_t>> computeEncryptionKey(const Vector<uint8_t>&);
ExceptionOr<Vector<uint8_t>> encryptData(const uint8_t*, size_t, const Vector<uint8_t>& iv, const Vector<uint8_t>& key);
ExceptionOr<Vector<uint8_t>> decryptData(const uint8_t*, size_t, const Vector<uint8_t>& iv, const Vector<uint8_t>& key);
Vector<uint8_t> computeEncryptedDataSignature(const Vector<uint8_t>& nonce, const uint8_t* header, size_t headerSize, const uint8_t* data, size_t dataSize, const Vector<uint8_t>& key);
void updateAuthenticationSize();
mutable Lock m_keyLock;
bool m_hasKey { false };
Vector<uint8_t> m_authenticationKey;
Vector<uint8_t> m_encryptionKey;
Vector<uint8_t> m_saltKey;
struct IdentifiedKey {
uint64_t keyId { 0 };
Vector<uint8_t> keyData;
};
Vector<IdentifiedKey> m_keys WTF_GUARDED_BY_LOCK(m_keyLock);
bool m_isEncrypting { false };
uint64_t m_authenticationSize { 10 };
uint64_t m_keyId { 0 };
uint64_t m_counter { 0 };
CompatibilityMode m_compatibilityMode { CompatibilityMode::None };
};
inline void RTCRtpSFrameTransformer::setIsEncrypting(bool isEncrypting)
{
m_isEncrypting = isEncrypting;
}
inline void RTCRtpSFrameTransformer::setAuthenticationSize(uint64_t size)
{
m_authenticationSize = size;
}
inline void RTCRtpSFrameTransformer::setMediaType(RTCRtpTransformBackend::MediaType mediaType)
{
if (mediaType == RTCRtpTransformBackend::MediaType::Video) {
m_authenticationSize = 10;
return;
}
m_authenticationSize = 4;
m_compatibilityMode = CompatibilityMode::None;
}
} // namespace WebCore
#endif // ENABLE(WEB_RTC)
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