119 lines
4.5 KiB
C++
119 lines
4.5 KiB
C++
/*
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* Copyright (C) 2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "RTCRtpSFrameTransformer.h"
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#if ENABLE(WEB_RTC)
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#include "CryptoUtilitiesCocoa.h"
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#include <CommonCrypto/CommonCrypto.h>
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namespace WebCore {
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ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::computeSaltKey(const Vector<uint8_t>& rawKey)
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{
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uint8_t usage[] = "SFrame10";
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uint8_t info[] = "salt";
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return deriveHDKFSHA256Bits(rawKey.data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 96);
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}
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static ExceptionOr<Vector<uint8_t>> createBaseSFrameKey(const Vector<uint8_t>& rawKey)
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{
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uint8_t usage[] = "SFrame10";
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uint8_t info[] = "key";
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return deriveHDKFSHA256Bits(rawKey.data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 128);
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}
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ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::computeAuthenticationKey(const Vector<uint8_t>& rawKey)
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{
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auto key = createBaseSFrameKey(rawKey);
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if (key.hasException())
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return key;
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uint8_t usage[] = "SFrame10 AES CM AEAD";
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uint8_t info[] = "auth";
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return deriveHDKFSHA256Bits(key.returnValue().data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 256);
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}
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ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::computeEncryptionKey(const Vector<uint8_t>& rawKey)
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{
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auto key = createBaseSFrameKey(rawKey);
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if (key.hasException())
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return key;
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uint8_t usage[] = "SFrame10 AES CM AEAD";
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uint8_t info[] = "enc";
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return deriveHDKFSHA256Bits(key.returnValue().data(), 16, usage, sizeof(usage) - 1, info, sizeof(info) - 1, 128);
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}
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ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::decryptData(const uint8_t* data, size_t size, const Vector<uint8_t>& iv, const Vector<uint8_t>& key)
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{
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return transformAES_CTR(kCCDecrypt, iv, iv.size(), key, data, size);
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}
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ExceptionOr<Vector<uint8_t>> RTCRtpSFrameTransformer::encryptData(const uint8_t* data, size_t size, const Vector<uint8_t>& iv, const Vector<uint8_t>& key)
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{
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return transformAES_CTR(kCCEncrypt, iv, iv.size(), key, data, size);
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}
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static inline Vector<uint8_t, 8> encodeBigEndian(uint64_t value)
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{
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Vector<uint8_t, 8> result(8);
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for (int i = 7; i >= 0; --i) {
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result.data()[i] = value & 0xff;
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value = value >> 8;
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}
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return result;
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}
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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)
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{
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auto headerLength = encodeBigEndian(headerSize);
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auto dataLength = encodeBigEndian(dataSize);
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Vector<uint8_t> result(CC_SHA256_DIGEST_LENGTH);
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CCHmacContext context;
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CCHmacInit(&context, kCCHmacAlgSHA256, key.data(), key.size());
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CCHmacUpdate(&context, headerLength.data(), headerLength.size());
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CCHmacUpdate(&context, dataLength.data(), dataLength.size());
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CCHmacUpdate(&context, nonce.data(), 12);
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CCHmacUpdate(&context, header, headerSize);
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CCHmacUpdate(&context, data, dataSize);
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CCHmacFinal(&context, result.data());
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return result;
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}
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void RTCRtpSFrameTransformer::updateAuthenticationSize()
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{
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if (m_authenticationSize > CC_SHA256_DIGEST_LENGTH)
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m_authenticationSize = CC_SHA256_DIGEST_LENGTH;
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_RTC)
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