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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. ``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
* 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.
*/
#include "config.h"
#include "RTCRtpSFrameTransformer.h"
#if ENABLE(WEB_RTC)
#include "CryptoUtilitiesCocoa.h"
#include <CommonCrypto/CommonCrypto.h>
namespace WebCore {
ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::computeSaltKey(const Vector<uint8_t>& rawKey)
{
uint8_t usage[] = "SFrame10";
uint8_t info[] = "salt";
return deriveHDKFSHA256Bits(rawKey.data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 96);
}
static ExceptionOr<Vector<uint8_t>> createBaseSFrameKey(const Vector<uint8_t>& rawKey)
{
uint8_t usage[] = "SFrame10";
uint8_t info[] = "key";
return deriveHDKFSHA256Bits(rawKey.data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 128);
}
ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::computeAuthenticationKey(const Vector<uint8_t>& rawKey)
{
auto key = createBaseSFrameKey(rawKey);
if (key.hasException())
return key;
uint8_t usage[] = "SFrame10 AES CM AEAD";
uint8_t info[] = "auth";
return deriveHDKFSHA256Bits(key.returnValue().data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 256);
}
ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::computeEncryptionKey(const Vector<uint8_t>& rawKey)
{
auto key = createBaseSFrameKey(rawKey);
if (key.hasException())
return key;
uint8_t usage[] = "SFrame10 AES CM AEAD";
uint8_t info[] = "enc";
return deriveHDKFSHA256Bits(key.returnValue().data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 128);
}
ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::decryptData(const uint8_t* data, size_t size, const Vector<uint8_t>& iv, const Vector<uint8_t>& key)
{
return transformAES_CTR(kCCDecrypt, iv, iv.size(), key, data, size);
}
ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::encryptData(const uint8_t* data, size_t size, const Vector<uint8_t>& iv, const Vector<uint8_t>& key)
{
return transformAES_CTR(kCCEncrypt, iv, iv.size(), key, data, size);
}
static inline Vector<uint8_t, 8> encodeBigEndian(uint64_t value)
{
Vector<uint8_t, 8> result(8);
for (int i = 7; i >= 0; --i) {
result.data()[i] = value & 0xff;
value = value >> 8;
}
return result;
}
Vector<uint8_t> RTCRtpSFrameTransformer::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)
{
auto headerLength = encodeBigEndian(headerSize);
auto dataLength = encodeBigEndian(dataSize);
Vector<uint8_t> result(CC_SHA256_DIGEST_LENGTH);
CCHmacContext context;
CCHmacInit(&context, kCCHmacAlgSHA256, key.data(), key.size());
CCHmacUpdate(&context, headerLength.data(), headerLength.size());
CCHmacUpdate(&context, dataLength.data(), dataLength.size());
CCHmacUpdate(&context, nonce.data(), 12);
CCHmacUpdate(&context, header, headerSize);
CCHmacUpdate(&context, data, dataSize);
CCHmacFinal(&context, result.data());
return result;
}
void RTCRtpSFrameTransformer::updateAuthenticationSize()
{
if (m_authenticationSize > CC_SHA256_DIGEST_LENGTH)
m_authenticationSize = CC_SHA256_DIGEST_LENGTH;
}
} // namespace WebCore
#endif // ENABLE(WEB_RTC)
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