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https://github.com/facebookincubator/mvfst.git
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00e67c1bf9
Reviewed By: lnicco Differential Revision: D33587012 fbshipit-source-id: 972eb440f0156c9c04aa6e8787561b18295c1a97
98 lines
2.9 KiB
C++
98 lines
2.9 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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void PacketNumberCipher::decipherHeader(
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folly::ByteRange sample,
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folly::MutableByteRange initialByte,
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folly::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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HeaderProtectionMask headerMask = mask(sample);
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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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}
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void PacketNumberCipher::cipherHeader(
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folly::ByteRange sample,
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folly::MutableByteRange initialByte,
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folly::MutableByteRange packetNumberBytes,
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uint8_t initialByteMask,
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uint8_t /* packetNumLengthMask */) const {
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HeaderProtectionMask headerMask = mask(sample);
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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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}
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void PacketNumberCipher::decryptLongHeader(
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folly::ByteRange sample,
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folly::MutableByteRange initialByte,
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folly::MutableByteRange packetNumberBytes) const {
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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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void PacketNumberCipher::decryptShortHeader(
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folly::ByteRange sample,
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folly::MutableByteRange initialByte,
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folly::MutableByteRange packetNumberBytes) const {
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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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void PacketNumberCipher::encryptLongHeader(
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folly::ByteRange sample,
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folly::MutableByteRange initialByte,
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folly::MutableByteRange packetNumberBytes) const {
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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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void PacketNumberCipher::encryptShortHeader(
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folly::ByteRange sample,
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folly::MutableByteRange initialByte,
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folly::MutableByteRange packetNumberBytes) const {
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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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