mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2025-04-26 08:57:26 +02:00
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
/*
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* Copyright (c)2013-2020 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2024-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#include "Protocol.hpp"
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#include "Buf.hpp"
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#include "Utils.hpp"
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#include <cstdlib>
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namespace ZeroTier {
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namespace Protocol {
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uint64_t createProbe(const Identity &sender,const Identity &recipient,const uint8_t key[ZT_PEER_SECRET_KEY_LENGTH]) noexcept
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{
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uint8_t tmp[ZT_IDENTITY_HASH_SIZE + ZT_IDENTITY_HASH_SIZE];
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memcpy(tmp,sender.hash().data(),ZT_IDENTITY_HASH_SIZE);
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memcpy(tmp + ZT_IDENTITY_HASH_SIZE,recipient.hash().data(),ZT_IDENTITY_HASH_SIZE);
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uint64_t hash[6];
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SHA384(hash,tmp,sizeof(tmp),key,ZT_PEER_SECRET_KEY_LENGTH);
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return hash[0];
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}
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uint64_t getPacketId() noexcept
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{
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static std::atomic<uint64_t> s_packetIdCtr(Utils::getSecureRandomU64());
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return ++s_packetIdCtr;
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}
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void armor(Buf &pkt,int packetSize,const uint8_t key[ZT_PEER_SECRET_KEY_LENGTH],uint8_t cipherSuite) noexcept
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{
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Protocol::Header &ph = pkt.as<Protocol::Header>();
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ph.flags = (ph.flags & 0xc7U) | ((cipherSuite << 3U) & 0x38U); // flags: FFCCCHHH where CCC is cipher
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switch(cipherSuite) {
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case ZT_PROTO_CIPHER_SUITE__POLY1305_NONE: {
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uint8_t perPacketKey[ZT_PEER_SECRET_KEY_LENGTH];
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salsa2012DeriveKey(key,perPacketKey,pkt,packetSize);
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Salsa20 s20(perPacketKey,&ph.packetId);
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uint8_t macKey[ZT_POLY1305_KEY_LEN];
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s20.crypt12(Utils::ZERO256,macKey,ZT_POLY1305_KEY_LEN);
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// only difference here is that we don't encrypt the payload
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uint64_t mac[2];
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poly1305(mac,pkt.unsafeData + ZT_PROTO_PACKET_ENCRYPTED_SECTION_START,packetSize - ZT_PROTO_PACKET_ENCRYPTED_SECTION_START,macKey);
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ph.mac = mac[0];
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} break;
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case ZT_PROTO_CIPHER_SUITE__POLY1305_SALSA2012: {
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uint8_t perPacketKey[ZT_PEER_SECRET_KEY_LENGTH];
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salsa2012DeriveKey(key,perPacketKey,pkt,packetSize);
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Salsa20 s20(perPacketKey,&ph.packetId);
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uint8_t macKey[ZT_POLY1305_KEY_LEN];
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s20.crypt12(Utils::ZERO256,macKey,ZT_POLY1305_KEY_LEN);
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const unsigned int encLen = packetSize - ZT_PROTO_PACKET_ENCRYPTED_SECTION_START;
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s20.crypt12(pkt.unsafeData + ZT_PROTO_PACKET_ENCRYPTED_SECTION_START,pkt.unsafeData + ZT_PROTO_PACKET_ENCRYPTED_SECTION_START,encLen);
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uint64_t mac[2];
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poly1305(mac,pkt.unsafeData + ZT_PROTO_PACKET_ENCRYPTED_SECTION_START,encLen,macKey);
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ph.mac = mac[0];
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} break;
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case ZT_PROTO_CIPHER_SUITE__AES_GCM_NRH: {
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} break;
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}
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}
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int compress(SharedPtr<Buf> &pkt,int packetSize) noexcept
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{
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if (packetSize <= 128)
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return packetSize;
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SharedPtr<Buf> pkt2(new Buf());
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if (!pkt2) return packetSize;
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const int uncompressedLen = packetSize - ZT_PROTO_PACKET_PAYLOAD_START;
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const int compressedLen = LZ4_compress_fast(reinterpret_cast<const char *>(pkt->unsafeData + ZT_PROTO_PACKET_PAYLOAD_START),reinterpret_cast<char *>(pkt2->unsafeData + ZT_PROTO_PACKET_PAYLOAD_START),uncompressedLen,ZT_BUF_MEM_SIZE - ZT_PROTO_PACKET_PAYLOAD_START);
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if ((compressedLen > 0)&&(compressedLen < uncompressedLen)) {
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memcpy(pkt2->unsafeData,pkt->unsafeData,ZT_PROTO_PACKET_PAYLOAD_START);
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pkt.swap(pkt2);
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pkt->as<Protocol::Header>().verb |= ZT_PROTO_VERB_FLAG_COMPRESSED;
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return compressedLen + ZT_PROTO_PACKET_PAYLOAD_START;
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}
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return packetSize;
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}
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} // namespace Protocol
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} // namespace ZeroTier
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