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https://github.com/facebookincubator/mvfst.git
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92c50dad6f
Summary: Continuing the theme. Reviewed By: kvtsoy Differential Revision: D74944002 fbshipit-source-id: 9f23780aada2841ee88a365b93850fde4bb27a70
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <quic/codec/PacketNumberCipher.h>
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#include <quic/codec/Decode.h>
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#include <quic/codec/Types.h>
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namespace quic {
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folly::Expected<folly::Unit, QuicError> PacketNumberCipher::decipherHeader(
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ByteRange sample,
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MutableByteRange initialByte,
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MutableByteRange packetNumberBytes,
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uint8_t initialByteMask,
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uint8_t /* packetNumLengthMask */) const {
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CHECK_EQ(packetNumberBytes.size(), kMaxPacketNumEncodingSize);
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auto maskResult = mask(sample);
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if (maskResult.hasError()) {
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return folly::makeUnexpected(maskResult.error());
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}
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HeaderProtectionMask headerMask = std::move(maskResult.value());
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// Mask size should be > packet number length + 1.
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DCHECK_GE(headerMask.size(), 5);
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initialByte.data()[0] ^= headerMask.data()[0] & initialByteMask;
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size_t packetNumLength = parsePacketNumberLength(*initialByte.data());
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for (size_t i = 0; i < packetNumLength; ++i) {
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packetNumberBytes.data()[i] ^= headerMask.data()[i + 1];
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}
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return folly::unit;
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}
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folly::Expected<folly::Unit, QuicError> PacketNumberCipher::cipherHeader(
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ByteRange sample,
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MutableByteRange initialByte,
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MutableByteRange packetNumberBytes,
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uint8_t initialByteMask,
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uint8_t /* packetNumLengthMask */) const {
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auto maskResult = mask(sample);
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if (maskResult.hasError()) {
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return folly::makeUnexpected(maskResult.error());
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}
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HeaderProtectionMask headerMask = std::move(maskResult.value());
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// Mask size should be > packet number length + 1.
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DCHECK_GE(headerMask.size(), kMaxPacketNumEncodingSize + 1);
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size_t packetNumLength = parsePacketNumberLength(*initialByte.data());
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initialByte.data()[0] ^= headerMask.data()[0] & initialByteMask;
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for (size_t i = 0; i < packetNumLength; ++i) {
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packetNumberBytes.data()[i] ^= headerMask.data()[i + 1];
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}
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return folly::unit;
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}
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folly::Expected<folly::Unit, QuicError> PacketNumberCipher::decryptLongHeader(
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ByteRange sample,
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MutableByteRange initialByte,
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MutableByteRange packetNumberBytes) const {
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return decipherHeader(
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sample,
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initialByte,
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packetNumberBytes,
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LongHeader::kTypeBitsMask,
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LongHeader::kPacketNumLenMask);
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}
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folly::Expected<folly::Unit, QuicError> PacketNumberCipher::decryptShortHeader(
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ByteRange sample,
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MutableByteRange initialByte,
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MutableByteRange packetNumberBytes) const {
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return decipherHeader(
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sample,
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initialByte,
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packetNumberBytes,
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ShortHeader::kTypeBitsMask,
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ShortHeader::kPacketNumLenMask);
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}
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folly::Expected<folly::Unit, QuicError> PacketNumberCipher::encryptLongHeader(
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ByteRange sample,
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MutableByteRange initialByte,
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MutableByteRange packetNumberBytes) const {
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return cipherHeader(
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sample,
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initialByte,
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packetNumberBytes,
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LongHeader::kTypeBitsMask,
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LongHeader::kPacketNumLenMask);
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}
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folly::Expected<folly::Unit, QuicError> PacketNumberCipher::encryptShortHeader(
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ByteRange sample,
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MutableByteRange initialByte,
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MutableByteRange packetNumberBytes) const {
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return cipherHeader(
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sample,
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initialByte,
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packetNumberBytes,
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ShortHeader::kTypeBitsMask,
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ShortHeader::kPacketNumLenMask);
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}
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} // namespace quic
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