mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-10 08:00:38 +03:00
922 lines
33 KiB
C++
922 lines
33 KiB
C++
/*
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* Copyright (c) 2013-2020, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#include <string.h>
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#include <openssl/sha.h>
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#include "Log.h"
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#include "Crypto.h"
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#include "Elligator.h"
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#include "Tag.h"
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#include "I2PEndian.h"
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#include "Timestamp.h"
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#include "Tunnel.h"
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#include "TunnelPool.h"
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#include "ECIESX25519AEADRatchetSession.h"
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namespace i2p
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{
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namespace garlic
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{
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void RatchetTagSet::DHInitialize (const uint8_t * rootKey, const uint8_t * k)
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{
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// DH_INITIALIZE(rootKey, k)
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uint8_t keydata[64];
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i2p::crypto::HKDF (rootKey, k, 32, "KDFDHRatchetStep", keydata); // keydata = HKDF(rootKey, k, "KDFDHRatchetStep", 64)
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memcpy (m_NextRootKey, keydata, 32); // nextRootKey = keydata[0:31]
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i2p::crypto::HKDF (keydata + 32, nullptr, 0, "TagAndKeyGenKeys", m_KeyData.buf);
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// [sessTag_ck, symmKey_ck] = HKDF(keydata[32:63], ZEROLEN, "TagAndKeyGenKeys", 64)
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memcpy (m_SymmKeyCK, m_KeyData.buf + 32, 32);
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m_NextSymmKeyIndex = 0;
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}
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void RatchetTagSet::NextSessionTagRatchet ()
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{
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i2p::crypto::HKDF (m_KeyData.GetSessTagCK (), nullptr, 0, "STInitialization", m_KeyData.buf); // [sessTag_ck, sesstag_constant] = HKDF(sessTag_ck, ZEROLEN, "STInitialization", 64)
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memcpy (m_SessTagConstant, m_KeyData.GetSessTagConstant (), 32);
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m_NextIndex = 0;
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}
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uint64_t RatchetTagSet::GetNextSessionTag ()
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{
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i2p::crypto::HKDF (m_KeyData.GetSessTagCK (), m_SessTagConstant, 32, "SessionTagKeyGen", m_KeyData.buf); // [sessTag_ck, tag] = HKDF(sessTag_chainkey, SESSTAG_CONSTANT, "SessionTagKeyGen", 64)
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m_NextIndex++;
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if (m_NextIndex >= 65535)
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{
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LogPrint (eLogError, "Garlic: Tagset ", GetTagSetID (), " is empty");
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return 0;
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}
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return m_KeyData.GetTag ();
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}
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void RatchetTagSet::GetSymmKey (int index, uint8_t * key)
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{
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if (index >= m_NextSymmKeyIndex)
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{
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auto num = index + 1 - m_NextSymmKeyIndex;
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if (!m_NextSymmKeyIndex)
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{
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i2p::crypto::HKDF (m_SymmKeyCK, nullptr, 0, "SymmetricRatchet", m_CurrentSymmKeyCK); // keydata_0 = HKDF(symmKey_ck, SYMMKEY_CONSTANT, "SymmetricRatchet", 64)
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m_NextSymmKeyIndex = 1;
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num--;
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}
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for (int i = 0; i < num; i++)
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{
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i2p::crypto::HKDF (m_CurrentSymmKeyCK, nullptr, 0, "SymmetricRatchet", m_CurrentSymmKeyCK);
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if (i < num - 1)
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m_ItermediateSymmKeys.emplace (m_NextSymmKeyIndex + i, m_CurrentSymmKeyCK + 32);
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}
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m_NextSymmKeyIndex += num;
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memcpy (key, m_CurrentSymmKeyCK + 32, 32);
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}
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else
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{
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auto it = m_ItermediateSymmKeys.find (index);
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if (it != m_ItermediateSymmKeys.end ())
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{
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memcpy (key, it->second, 32);
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m_ItermediateSymmKeys.erase (it);
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}
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else
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LogPrint (eLogError, "Garlic: Missing symmetric key for index ", index);
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}
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}
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void RatchetTagSet::Expire ()
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{
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if (!m_ExpirationTimestamp)
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m_ExpirationTimestamp = i2p::util::GetSecondsSinceEpoch () + ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT;
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}
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ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner, bool attachLeaseSet):
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GarlicRoutingSession (owner, attachLeaseSet)
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{
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ResetKeys ();
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}
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ECIESX25519AEADRatchetSession::~ECIESX25519AEADRatchetSession ()
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{
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}
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void ECIESX25519AEADRatchetSession::ResetKeys ()
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{
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static const uint8_t protocolNameHash[32] =
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{
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0x4c, 0xaf, 0x11, 0xef, 0x2c, 0x8e, 0x36, 0x56, 0x4c, 0x53, 0xe8, 0x88, 0x85, 0x06, 0x4d, 0xba,
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0xac, 0xbe, 0x00, 0x54, 0xad, 0x17, 0x8f, 0x80, 0x79, 0xa6, 0x46, 0x82, 0x7e, 0x6e, 0xe4, 0x0c
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}; // SHA256("Noise_IKelg2+hs2_25519_ChaChaPoly_SHA256"), 40 bytes
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static const uint8_t hh[32] =
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{
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0x9c, 0xcf, 0x85, 0x2c, 0xc9, 0x3b, 0xb9, 0x50, 0x44, 0x41, 0xe9, 0x50, 0xe0, 0x1d, 0x52, 0x32,
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0x2e, 0x0d, 0x47, 0xad, 0xd1, 0xe9, 0xa5, 0x55, 0xf7, 0x55, 0xb5, 0x69, 0xae, 0x18, 0x3b, 0x5c
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}; // SHA256 (protocolNameHash)
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memcpy (m_CK, protocolNameHash, 32);
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memcpy (m_H, hh, 32);
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}
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void ECIESX25519AEADRatchetSession::MixHash (const uint8_t * buf, size_t len)
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{
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SHA256_CTX ctx;
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SHA256_Init (&ctx);
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SHA256_Update (&ctx, m_H, 32);
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SHA256_Update (&ctx, buf, len);
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SHA256_Final (m_H, &ctx);
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}
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void ECIESX25519AEADRatchetSession::CreateNonce (uint64_t seqn, uint8_t * nonce)
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{
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memset (nonce, 0, 4);
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htole64buf (nonce + 4, seqn);
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}
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bool ECIESX25519AEADRatchetSession::GenerateEphemeralKeysAndEncode (uint8_t * buf)
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{
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for (int i = 0; i < 10; i++)
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{
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m_EphemeralKeys.GenerateKeys ();
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if (i2p::crypto::GetElligator ()->Encode (m_EphemeralKeys.GetPublicKey (), buf))
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return true; // success
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}
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return false;
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}
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std::shared_ptr<RatchetTagSet> ECIESX25519AEADRatchetSession::CreateNewSessionTagset ()
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{
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uint8_t tagsetKey[32];
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i2p::crypto::HKDF (m_CK, nullptr, 0, "SessionReplyTags", tagsetKey, 32); // tagsetKey = HKDF(chainKey, ZEROLEN, "SessionReplyTags", 32)
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// Session Tag Ratchet
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auto tagsetNsr = std::make_shared<RatchetTagSet>(shared_from_this ());
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tagsetNsr->DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
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tagsetNsr->NextSessionTagRatchet ();
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return tagsetNsr;
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}
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bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
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{
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if (!GetOwner ()) return false;
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// we are Bob
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// KDF1
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MixHash (GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET), 32); // h = SHA256(h || bpk)
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if (!i2p::crypto::GetElligator ()->Decode (buf, m_Aepk))
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{
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LogPrint (eLogError, "Garlic: Can't decode elligator");
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return false;
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}
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buf += 32; len -= 32;
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MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
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uint8_t sharedSecret[32];
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GetOwner ()->Decrypt (m_Aepk, sharedSecret, nullptr, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET); // x25519(bsk, aepk)
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i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
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// decrypt flags/static
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uint8_t nonce[12], fs[32];
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CreateNonce (0, nonce);
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if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 32, m_H, 32, m_CK + 32, nonce, fs, 32, false)) // decrypt
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{
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LogPrint (eLogWarning, "Garlic: Flags/static section AEAD verification failed ");
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return false;
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}
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MixHash (buf, 48); // h = SHA256(h || ciphertext)
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buf += 48; len -= 48; // 32 data + 16 poly
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// KDF2 for payload
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bool isStatic = !i2p::data::Tag<32> (fs).IsZero ();
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if (isStatic)
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{
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// static key, fs is apk
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memcpy (m_RemoteStaticKey, fs, 32);
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GetOwner ()->Decrypt (fs, sharedSecret, nullptr, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET); // x25519(bsk, apk)
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i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
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}
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else // all zeros flags
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CreateNonce (1, nonce);
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// decrypt payload
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std::vector<uint8_t> payload (len - 16); // we must save original ciphertext
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if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, m_CK + 32, nonce, payload.data (), len - 16, false)) // decrypt
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{
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LogPrint (eLogWarning, "Garlic: Payload section AEAD verification failed");
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return false;
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}
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if (isStatic) MixHash (buf, len); // h = SHA256(h || ciphertext)
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m_State = eSessionStateNewSessionReceived;
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GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
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HandlePayload (payload.data (), len - 16, nullptr, 0);
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return true;
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}
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void ECIESX25519AEADRatchetSession::HandlePayload (const uint8_t * buf, size_t len, const std::shared_ptr<RatchetTagSet>& receiveTagset, int index)
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{
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size_t offset = 0;
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while (offset < len)
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{
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uint8_t blk = buf[offset];
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offset++;
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auto size = bufbe16toh (buf + offset);
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offset += 2;
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LogPrint (eLogDebug, "Garlic: Block type ", (int)blk, " of size ", size);
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if (size > len)
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{
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LogPrint (eLogError, "Garlic: Unexpected block length ", size);
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break;
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}
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switch (blk)
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{
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case eECIESx25519BlkGalicClove:
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if (GetOwner ())
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GetOwner ()->HandleECIESx25519GarlicClove (buf + offset, size);
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break;
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case eECIESx25519BlkNextKey:
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LogPrint (eLogDebug, "Garlic: next key");
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HandleNextKey (buf + offset, size, receiveTagset);
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break;
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case eECIESx25519BlkAck:
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{
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LogPrint (eLogDebug, "Garlic: ack");
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int numAcks = size >> 2; // /4
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auto offset1 = offset;
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for (auto i = 0; i < numAcks; i++)
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{
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offset1 += 2; // tagsetid
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MessageConfirmed (bufbe16toh (buf + offset1)); offset1 += 2; // N
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}
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break;
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}
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case eECIESx25519BlkAckRequest:
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{
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LogPrint (eLogDebug, "Garlic: ack request");
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m_AckRequests.push_back ({receiveTagset->GetTagSetID (), index});
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break;
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}
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case eECIESx25519BlkTermination:
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LogPrint (eLogDebug, "Garlic: termination");
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if (GetOwner ())
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GetOwner ()->RemoveECIESx25519Session (m_RemoteStaticKey);
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if (receiveTagset) receiveTagset->Expire ();
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break;
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case eECIESx25519BlkDateTime:
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LogPrint (eLogDebug, "Garlic: datetime");
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break;
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case eECIESx25519BlkOptions:
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LogPrint (eLogDebug, "Garlic: options");
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break;
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case eECIESx25519BlkPadding:
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LogPrint (eLogDebug, "Garlic: padding");
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break;
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default:
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LogPrint (eLogWarning, "Garlic: Unknown block type ", (int)blk);
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}
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offset += size;
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}
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}
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void ECIESX25519AEADRatchetSession::HandleNextKey (const uint8_t * buf, size_t len, const std::shared_ptr<RatchetTagSet>& receiveTagset)
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{
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uint8_t flag = buf[0]; buf++; // flag
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if (flag & ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG)
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{
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if (!m_SendForwardKey || !m_NextSendRatchet) return;
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uint16_t keyID = bufbe16toh (buf); buf += 2; // keyID
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if (((!m_NextSendRatchet->newKey || !m_NextSendRatchet->keyID) && keyID == m_NextSendRatchet->keyID) ||
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(m_NextSendRatchet->newKey && keyID == m_NextSendRatchet->keyID -1))
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{
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if (flag & ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG)
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memcpy (m_NextSendRatchet->remote, buf, 32);
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uint8_t sharedSecret[32], tagsetKey[32];
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m_NextSendRatchet->key.Agree (m_NextSendRatchet->remote, sharedSecret);
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i2p::crypto::HKDF (sharedSecret, nullptr, 0, "XDHRatchetTagSet", tagsetKey, 32); // tagsetKey = HKDF(sharedSecret, ZEROLEN, "XDHRatchetTagSet", 32)
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auto newTagset = std::make_shared<RatchetTagSet> (shared_from_this ());
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newTagset->SetTagSetID (1 + m_NextSendRatchet->keyID + keyID);
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newTagset->DHInitialize (m_SendTagset->GetNextRootKey (), tagsetKey);
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newTagset->NextSessionTagRatchet ();
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m_SendTagset = newTagset;
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m_SendForwardKey = false;
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LogPrint (eLogDebug, "Garlic: next send tagset ", newTagset->GetTagSetID (), " created");
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}
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else
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LogPrint (eLogDebug, "Garlic: Unexpected next key ", keyID);
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}
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else
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{
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uint16_t keyID = bufbe16toh (buf); buf += 2; // keyID
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bool newKey = flag & ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
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m_SendReverseKey = true;
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if (!m_NextReceiveRatchet)
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m_NextReceiveRatchet.reset (new DHRatchet ());
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else
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{
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if (keyID == m_NextReceiveRatchet->keyID && newKey == m_NextReceiveRatchet->newKey)
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{
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LogPrint (eLogDebug, "Garlic: Duplicate ", newKey ? "new" : "old", " key ", keyID, " received");
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return;
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}
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m_NextReceiveRatchet->keyID = keyID;
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}
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int tagsetID = 2*keyID;
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if (newKey)
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{
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m_NextReceiveRatchet->key.GenerateKeys ();
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m_NextReceiveRatchet->newKey = true;
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tagsetID++;
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}
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else
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m_NextReceiveRatchet->newKey = false;
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if (flag & ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG)
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memcpy (m_NextReceiveRatchet->remote, buf, 32);
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uint8_t sharedSecret[32], tagsetKey[32];
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m_NextReceiveRatchet->key.Agree (m_NextReceiveRatchet->remote, sharedSecret);
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i2p::crypto::HKDF (sharedSecret, nullptr, 0, "XDHRatchetTagSet", tagsetKey, 32); // tagsetKey = HKDF(sharedSecret, ZEROLEN, "XDHRatchetTagSet", 32)
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auto newTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
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newTagset->SetTagSetID (tagsetID);
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newTagset->DHInitialize (receiveTagset->GetNextRootKey (), tagsetKey);
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newTagset->NextSessionTagRatchet ();
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GenerateMoreReceiveTags (newTagset, ECIESX25519_MAX_NUM_GENERATED_TAGS);
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receiveTagset->Expire ();
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LogPrint (eLogDebug, "Garlic: next receive tagset ", tagsetID, " created");
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}
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}
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void ECIESX25519AEADRatchetSession::NewNextSendRatchet ()
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{
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if (m_NextSendRatchet)
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{
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if (!m_NextSendRatchet->newKey || !m_NextSendRatchet->keyID)
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{
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m_NextSendRatchet->keyID++;
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m_NextSendRatchet->newKey = true;
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}
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else
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m_NextSendRatchet->newKey = false;
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}
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else
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m_NextSendRatchet.reset (new DHRatchet ());
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if (m_NextSendRatchet->newKey)
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m_NextSendRatchet->key.GenerateKeys ();
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m_SendForwardKey = true;
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LogPrint (eLogDebug, "Garlic: new send ratchet ", m_NextSendRatchet->newKey ? "new" : "old", " key ", m_NextSendRatchet->keyID, " created");
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}
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bool ECIESX25519AEADRatchetSession::NewOutgoingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
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{
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ResetKeys ();
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// we are Alice, bpk is m_RemoteStaticKey
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size_t offset = 0;
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if (!GenerateEphemeralKeysAndEncode (out + offset))
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{
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LogPrint (eLogError, "Garlic: Can't encode elligator");
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return false;
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}
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offset += 32;
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// KDF1
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MixHash (m_RemoteStaticKey, 32); // h = SHA256(h || bpk)
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MixHash (m_EphemeralKeys.GetPublicKey (), 32); // h = SHA256(h || aepk)
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uint8_t sharedSecret[32];
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m_EphemeralKeys.Agree (m_RemoteStaticKey, sharedSecret); // x25519(aesk, bpk)
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i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
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// encrypt static key section
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uint8_t nonce[12];
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CreateNonce (0, nonce);
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if (!i2p::crypto::AEADChaCha20Poly1305 (GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET), 32, m_H, 32, m_CK + 32, nonce, out + offset, 48, true)) // encrypt
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{
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LogPrint (eLogWarning, "Garlic: Static section AEAD encryption failed ");
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return false;
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}
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MixHash (out + offset, 48); // h = SHA256(h || ciphertext)
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offset += 48;
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// KDF2
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GetOwner ()->Decrypt (m_RemoteStaticKey, sharedSecret, nullptr, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET); // x25519 (ask, bpk)
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i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
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// encrypt payload
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if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_CK + 32, nonce, out + offset, len + 16, true)) // encrypt
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{
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LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
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return false;
|
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}
|
|
MixHash (out + offset, len + 16); // h = SHA256(h || ciphertext)
|
|
|
|
m_State = eSessionStateNewSessionSent;
|
|
if (GetOwner ())
|
|
GenerateMoreReceiveTags (CreateNewSessionTagset (), ECIESX25519_NSR_NUM_GENERATED_TAGS);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
|
|
{
|
|
// we are Bob
|
|
m_NSRTagset = CreateNewSessionTagset ();
|
|
uint64_t tag = m_NSRTagset->GetNextSessionTag ();
|
|
|
|
size_t offset = 0;
|
|
memcpy (out + offset, &tag, 8);
|
|
offset += 8;
|
|
if (!GenerateEphemeralKeysAndEncode (out + offset)) // bepk
|
|
{
|
|
LogPrint (eLogError, "Garlic: Can't encode elligator");
|
|
return false;
|
|
}
|
|
memcpy (m_NSREncodedKey, out + offset, 56); // for possible next NSR
|
|
memcpy (m_NSRH, m_H, 32);
|
|
offset += 32;
|
|
// KDF for Reply Key Section
|
|
MixHash ((const uint8_t *)&tag, 8); // h = SHA256(h || tag)
|
|
MixHash (m_EphemeralKeys.GetPublicKey (), 32); // h = SHA256(h || bepk)
|
|
uint8_t sharedSecret[32];
|
|
m_EphemeralKeys.Agree (m_Aepk, sharedSecret); // sharedSecret = x25519(besk, aepk)
|
|
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK, 32); // chainKey = HKDF(chainKey, sharedSecret, "", 32)
|
|
m_EphemeralKeys.Agree (m_RemoteStaticKey, sharedSecret); // sharedSecret = x25519(besk, apk)
|
|
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
// calculate hash for zero length
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + offset, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Reply key section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
MixHash (out + offset, 16); // h = SHA256(h || ciphertext)
|
|
offset += 16;
|
|
// KDF for payload
|
|
uint8_t keydata[64];
|
|
i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
|
|
// k_ab = keydata[0:31], k_ba = keydata[32:63]
|
|
auto receiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
|
|
receiveTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
|
|
receiveTagset->NextSessionTagRatchet ();
|
|
m_SendTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
|
|
m_SendTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
|
|
m_SendTagset->NextSessionTagRatchet ();
|
|
GenerateMoreReceiveTags (receiveTagset, ECIESX25519_MIN_NUM_GENERATED_TAGS);
|
|
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", m_NSRKey, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
|
|
// encrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + offset, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: NSR payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
m_State = eSessionStateNewSessionReplySent;
|
|
m_SessionCreatedTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NextNewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
|
|
{
|
|
// we are Bob and sent NSR already
|
|
uint64_t tag = m_NSRTagset->GetNextSessionTag (); // next tag
|
|
memcpy (out, &tag, 8);
|
|
memcpy (out + 8, m_NSREncodedKey, 32);
|
|
// recalculate h with new tag
|
|
memcpy (m_H, m_NSRH, 32);
|
|
MixHash ((const uint8_t *)&tag, 8); // h = SHA256(h || tag)
|
|
MixHash (m_EphemeralKeys.GetPublicKey (), 32); // h = SHA256(h || bepk)
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + 40, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Reply key section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
MixHash (out + 40, 16); // h = SHA256(h || ciphertext)
|
|
// encrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + 56, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Next NSR payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleNewOutgoingSessionReply (uint8_t * buf, size_t len)
|
|
{
|
|
// we are Alice
|
|
LogPrint (eLogDebug, "Garlic: reply received");
|
|
const uint8_t * tag = buf;
|
|
buf += 8; len -= 8; // tag
|
|
uint8_t bepk[32]; // Bob's ephemeral key
|
|
if (!i2p::crypto::GetElligator ()->Decode (buf, bepk))
|
|
{
|
|
LogPrint (eLogError, "Garlic: Can't decode elligator");
|
|
return false;
|
|
}
|
|
buf += 32; len -= 32;
|
|
// KDF for Reply Key Section
|
|
uint8_t h[32]; memcpy (h, m_H, 32); // save m_H
|
|
MixHash (tag, 8); // h = SHA256(h || tag)
|
|
MixHash (bepk, 32); // h = SHA256(h || bepk)
|
|
uint8_t sharedSecret[32];
|
|
if (m_State == eSessionStateNewSessionSent)
|
|
{
|
|
// only fist time, we assume ephemeral keys the same
|
|
m_EphemeralKeys.Agree (bepk, sharedSecret); // sharedSecret = x25519(aesk, bepk)
|
|
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK, 32); // chainKey = HKDF(chainKey, sharedSecret, "", 32)
|
|
GetOwner ()->Decrypt (bepk, sharedSecret, nullptr, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET); // x25519 (ask, bepk)
|
|
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
|
|
}
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
// calculate hash for zero length
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 0, m_H, 32, m_CK + 32, nonce, sharedSecret/* can be anything */, 0, false)) // decrypt, DECRYPT(k, n, ZEROLEN, ad) verification only
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Reply key section AEAD decryption failed");
|
|
return false;
|
|
}
|
|
MixHash (buf, 16); // h = SHA256(h || ciphertext)
|
|
buf += 16; len -= 16;
|
|
// KDF for payload
|
|
uint8_t keydata[64];
|
|
i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
|
|
if (m_State == eSessionStateNewSessionSent)
|
|
{
|
|
// k_ab = keydata[0:31], k_ba = keydata[32:63]
|
|
m_SendTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
|
|
m_SendTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
|
|
m_SendTagset->NextSessionTagRatchet ();
|
|
auto receiveTagset = std::make_shared<RatchetTagSet>(shared_from_this ());
|
|
receiveTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
|
|
receiveTagset->NextSessionTagRatchet ();
|
|
GenerateMoreReceiveTags (receiveTagset, ECIESX25519_MIN_NUM_GENERATED_TAGS);
|
|
}
|
|
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
|
|
// decrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, keydata, nonce, buf, len - 16, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
|
|
return false;
|
|
}
|
|
|
|
if (m_State == eSessionStateNewSessionSent)
|
|
{
|
|
m_State = eSessionStateEstablished;
|
|
m_SessionCreatedTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
|
|
}
|
|
memcpy (m_H, h, 32); // restore m_H
|
|
HandlePayload (buf, len - 16, nullptr, 0);
|
|
|
|
// we have received reply to NS with LeaseSet in it
|
|
SetLeaseSetUpdateStatus (eLeaseSetUpToDate);
|
|
SetLeaseSetUpdateMsgID (0);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NewExistingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
|
|
{
|
|
uint8_t nonce[12];
|
|
auto index = m_SendTagset->GetNextIndex ();
|
|
CreateNonce (index, nonce); // tag's index
|
|
uint64_t tag = m_SendTagset->GetNextSessionTag ();
|
|
memcpy (out, &tag, 8);
|
|
// ad = The session tag, 8 bytes
|
|
// ciphertext = ENCRYPT(k, n, payload, ad)
|
|
uint8_t key[32];
|
|
m_SendTagset->GetSymmKey (index, key);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, out, 8, key, nonce, out + 8, outLen - 8, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
if (index >= ECIESX25519_TAGSET_MAX_NUM_TAGS && !m_SendForwardKey)
|
|
NewNextSendRatchet ();
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleExistingSessionMessage (uint8_t * buf, size_t len,
|
|
std::shared_ptr<RatchetTagSet> receiveTagset, int index)
|
|
{
|
|
uint8_t nonce[12];
|
|
CreateNonce (index, nonce); // tag's index
|
|
len -= 8; // tag
|
|
uint8_t * payload = buf + 8;
|
|
uint8_t key[32];
|
|
receiveTagset->GetSymmKey (index, key);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len - 16, buf, 8, key, nonce, payload, len - 16, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
|
|
return false;
|
|
}
|
|
HandlePayload (payload, len - 16, receiveTagset, index);
|
|
int moreTags = ECIESX25519_MIN_NUM_GENERATED_TAGS + (index >> 2); // N/4
|
|
if (moreTags > ECIESX25519_MAX_NUM_GENERATED_TAGS) moreTags = ECIESX25519_MAX_NUM_GENERATED_TAGS;
|
|
moreTags -= (receiveTagset->GetNextIndex () - index);
|
|
if (moreTags > 0 && GetOwner ())
|
|
GenerateMoreReceiveTags (receiveTagset, moreTags);
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleNextMessage (uint8_t * buf, size_t len,
|
|
std::shared_ptr<RatchetTagSet> receiveTagset, int index)
|
|
{
|
|
m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
switch (m_State)
|
|
{
|
|
case eSessionStateNewSessionReplySent:
|
|
m_State = eSessionStateEstablished;
|
|
m_NSRTagset = nullptr;
|
|
#if (__cplusplus >= 201703L) // C++ 17 or higher
|
|
[[fallthrough]];
|
|
#endif
|
|
case eSessionStateEstablished:
|
|
if (HandleExistingSessionMessage (buf, len, receiveTagset, index)) return true;
|
|
// check NSR just in case
|
|
LogPrint (eLogDebug, "Garlic: check for out of order NSR with index ", index);
|
|
if (receiveTagset->GetNextIndex () - index < ECIESX25519_NSR_NUM_GENERATED_TAGS/2)
|
|
GenerateMoreReceiveTags (receiveTagset, ECIESX25519_NSR_NUM_GENERATED_TAGS);
|
|
return HandleNewOutgoingSessionReply (buf, len);
|
|
case eSessionStateNew:
|
|
return HandleNewIncomingSession (buf, len);
|
|
case eSessionStateNewSessionSent:
|
|
receiveTagset->Expire (); // NSR tagset
|
|
return HandleNewOutgoingSessionReply (buf, len);
|
|
default:
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> ECIESX25519AEADRatchetSession::WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg)
|
|
{
|
|
auto payload = CreatePayload (msg, m_State != eSessionStateEstablished);
|
|
size_t len = payload.size ();
|
|
if (!len) return nullptr;
|
|
auto m = NewI2NPMessage (len + 100); // 96 + 4
|
|
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
|
|
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
|
|
|
|
switch (m_State)
|
|
{
|
|
case eSessionStateEstablished:
|
|
if (!NewExistingSessionMessage (payload.data (), payload.size (), buf, m->maxLen))
|
|
return nullptr;
|
|
len += 24;
|
|
break;
|
|
case eSessionStateNew:
|
|
if (!NewOutgoingSessionMessage (payload.data (), payload.size (), buf, m->maxLen))
|
|
return nullptr;
|
|
len += 96;
|
|
break;
|
|
case eSessionStateNewSessionReceived:
|
|
if (!NewSessionReplyMessage (payload.data (), payload.size (), buf, m->maxLen))
|
|
return nullptr;
|
|
len += 72;
|
|
break;
|
|
case eSessionStateNewSessionReplySent:
|
|
if (!NextNewSessionReplyMessage (payload.data (), payload.size (), buf, m->maxLen))
|
|
return nullptr;
|
|
len += 72;
|
|
break;
|
|
default:
|
|
return nullptr;
|
|
}
|
|
|
|
htobe32buf (m->GetPayload (), len);
|
|
m->len += len + 4;
|
|
m->FillI2NPMessageHeader (eI2NPGarlic);
|
|
return m;
|
|
}
|
|
|
|
std::vector<uint8_t> ECIESX25519AEADRatchetSession::CreatePayload (std::shared_ptr<const I2NPMessage> msg, bool first)
|
|
{
|
|
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
|
|
size_t payloadLen = 0;
|
|
if (first) payloadLen += 7;// datatime
|
|
if (msg && m_Destination)
|
|
payloadLen += msg->GetPayloadLength () + 13 + 32;
|
|
auto leaseSet = (GetLeaseSetUpdateStatus () == eLeaseSetUpdated ||
|
|
(GetLeaseSetUpdateStatus () == eLeaseSetSubmitted &&
|
|
ts > GetLeaseSetSubmissionTime () + LEASET_CONFIRMATION_TIMEOUT)) ?
|
|
GetOwner ()->GetLeaseSet () : nullptr;
|
|
if (leaseSet)
|
|
{
|
|
payloadLen += leaseSet->GetBufferLen () + DATABASE_STORE_HEADER_SIZE + 13;
|
|
if (!first)
|
|
{
|
|
// ack request
|
|
SetLeaseSetUpdateStatus (eLeaseSetSubmitted);
|
|
SetLeaseSetUpdateMsgID (m_SendTagset->GetNextIndex ());
|
|
SetLeaseSetSubmissionTime (ts);
|
|
payloadLen += 4;
|
|
}
|
|
}
|
|
if (m_AckRequests.size () > 0)
|
|
payloadLen += m_AckRequests.size ()*4 + 3;
|
|
if (m_SendReverseKey)
|
|
{
|
|
payloadLen += 6;
|
|
if (m_NextReceiveRatchet->newKey) payloadLen += 32;
|
|
}
|
|
if (m_SendForwardKey)
|
|
{
|
|
payloadLen += 6;
|
|
if (m_NextSendRatchet->newKey) payloadLen += 32;
|
|
}
|
|
uint8_t paddingSize = 0;
|
|
if (payloadLen)
|
|
{
|
|
int delta = (int)ECIESX25519_OPTIMAL_PAYLOAD_SIZE - (int)payloadLen;
|
|
if (delta < 0 || delta > 3) // don't create padding if we are close to optimal size
|
|
{
|
|
RAND_bytes (&paddingSize, 1);
|
|
paddingSize &= 0x0F; // 0 - 15
|
|
if (delta > 3)
|
|
{
|
|
delta -= 3;
|
|
if (paddingSize >= delta) paddingSize %= delta;
|
|
}
|
|
paddingSize++;
|
|
payloadLen += paddingSize + 3;
|
|
}
|
|
}
|
|
std::vector<uint8_t> v(payloadLen);
|
|
size_t offset = 0;
|
|
// DateTime
|
|
if (first)
|
|
{
|
|
v[offset] = eECIESx25519BlkDateTime; offset++;
|
|
htobe16buf (v.data () + offset, 4); offset += 2;
|
|
htobe32buf (v.data () + offset, ts/1000); offset += 4; // in seconds
|
|
}
|
|
// LeaseSet
|
|
if (leaseSet)
|
|
{
|
|
offset += CreateLeaseSetClove (leaseSet, ts, v.data () + offset, payloadLen - offset);
|
|
if (!first)
|
|
{
|
|
// ack request
|
|
v[offset] = eECIESx25519BlkAckRequest; offset++;
|
|
htobe16buf (v.data () + offset, 1); offset += 2;
|
|
v[offset] = 0; offset++; // flags
|
|
}
|
|
}
|
|
// msg
|
|
if (msg && m_Destination)
|
|
offset += CreateGarlicClove (msg, v.data () + offset, payloadLen - offset, true);
|
|
// ack
|
|
if (m_AckRequests.size () > 0)
|
|
{
|
|
v[offset] = eECIESx25519BlkAck; offset++;
|
|
htobe16buf (v.data () + offset, m_AckRequests.size () * 4); offset += 2;
|
|
for (auto& it: m_AckRequests)
|
|
{
|
|
htobe16buf (v.data () + offset, it.first); offset += 2;
|
|
htobe16buf (v.data () + offset, it.second); offset += 2;
|
|
}
|
|
m_AckRequests.clear ();
|
|
}
|
|
// next keys
|
|
if (m_SendReverseKey)
|
|
{
|
|
v[offset] = eECIESx25519BlkNextKey; offset++;
|
|
htobe16buf (v.data () + offset, m_NextReceiveRatchet->newKey ? 35 : 3); offset += 2;
|
|
v[offset] = ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG;
|
|
int keyID = m_NextReceiveRatchet->keyID - 1;
|
|
if (m_NextReceiveRatchet->newKey)
|
|
{
|
|
v[offset] |= ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG;
|
|
keyID++;
|
|
}
|
|
offset++; // flag
|
|
htobe16buf (v.data () + offset, keyID); offset += 2; // keyid
|
|
if (m_NextReceiveRatchet->newKey)
|
|
{
|
|
memcpy (v.data () + offset, m_NextReceiveRatchet->key.GetPublicKey (), 32);
|
|
offset += 32; // public key
|
|
}
|
|
m_SendReverseKey = false;
|
|
}
|
|
if (m_SendForwardKey)
|
|
{
|
|
v[offset] = eECIESx25519BlkNextKey; offset++;
|
|
htobe16buf (v.data () + offset, m_NextSendRatchet->newKey ? 35 : 3); offset += 2;
|
|
v[offset] = m_NextSendRatchet->newKey ? ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG : ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
|
|
if (!m_NextSendRatchet->keyID) v[offset] |= ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG; // for first key only
|
|
offset++; // flag
|
|
htobe16buf (v.data () + offset, m_NextSendRatchet->keyID); offset += 2; // keyid
|
|
if (m_NextSendRatchet->newKey)
|
|
{
|
|
memcpy (v.data () + offset, m_NextSendRatchet->key.GetPublicKey (), 32);
|
|
offset += 32; // public key
|
|
}
|
|
}
|
|
// padding
|
|
if (paddingSize)
|
|
{
|
|
v[offset] = eECIESx25519BlkPadding; offset++;
|
|
htobe16buf (v.data () + offset, paddingSize); offset += 2;
|
|
memset (v.data () + offset, 0, paddingSize); offset += paddingSize;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
size_t ECIESX25519AEADRatchetSession::CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len, bool isDestination)
|
|
{
|
|
if (!msg) return 0;
|
|
uint16_t cloveSize = msg->GetPayloadLength () + 9 + 1;
|
|
if (isDestination) cloveSize += 32;
|
|
if ((int)len < cloveSize + 3) return 0;
|
|
buf[0] = eECIESx25519BlkGalicClove; // clove type
|
|
htobe16buf (buf + 1, cloveSize); // size
|
|
buf += 3;
|
|
if (isDestination)
|
|
{
|
|
*buf = (eGarlicDeliveryTypeDestination << 5);
|
|
memcpy (buf + 1, *m_Destination, 32); buf += 32;
|
|
}
|
|
else
|
|
*buf = 0;
|
|
buf++; // flag and delivery instructions
|
|
*buf = msg->GetTypeID (); // I2NP msg type
|
|
htobe32buf (buf + 1, msg->GetMsgID ()); // msgID
|
|
htobe32buf (buf + 5, msg->GetExpiration () / 1000); // expiration in seconds
|
|
memcpy (buf + 9, msg->GetPayload (), msg->GetPayloadLength ());
|
|
return cloveSize + 3;
|
|
}
|
|
|
|
size_t ECIESX25519AEADRatchetSession::CreateLeaseSetClove (std::shared_ptr<const i2p::data::LocalLeaseSet> ls, uint64_t ts, uint8_t * buf, size_t len)
|
|
{
|
|
if (!ls || ls->GetStoreType () != i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2)
|
|
{
|
|
LogPrint (eLogError, "Garlic: Incorrect LeasetSet type to send");
|
|
return 0;
|
|
}
|
|
uint16_t cloveSize = 1 + 9 + DATABASE_STORE_HEADER_SIZE + ls->GetBufferLen (); // to local
|
|
if ((int)len < cloveSize + 3) return 0;
|
|
buf[0] = eECIESx25519BlkGalicClove; // clove type
|
|
htobe16buf (buf + 1, cloveSize); // size
|
|
buf += 3;
|
|
*buf = 0; buf++; // flag and delivery instructions
|
|
*buf = eI2NPDatabaseStore; buf++; // I2NP msg type
|
|
RAND_bytes (buf, 4); buf += 4; // msgID
|
|
htobe32buf (buf, (ts + I2NP_MESSAGE_EXPIRATION_TIMEOUT)/1000); buf += 4; // expiration
|
|
// payload
|
|
memcpy (buf + DATABASE_STORE_KEY_OFFSET, ls->GetStoreHash (), 32);
|
|
buf[DATABASE_STORE_TYPE_OFFSET] = i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2;
|
|
memset (buf + DATABASE_STORE_REPLY_TOKEN_OFFSET, 0, 4); // replyToken = 0
|
|
buf += DATABASE_STORE_HEADER_SIZE;
|
|
memcpy (buf, ls->GetBuffer (), ls->GetBufferLen ());
|
|
|
|
return cloveSize + 3;
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::GenerateMoreReceiveTags (std::shared_ptr<RatchetTagSet> receiveTagset, int numTags)
|
|
{
|
|
for (int i = 0; i < numTags; i++)
|
|
GetOwner ()->AddECIESx25519SessionNextTag (receiveTagset);
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::CheckExpired (uint64_t ts)
|
|
{
|
|
CleanupUnconfirmedLeaseSet (ts);
|
|
return ts > m_LastActivityTimestamp + ECIESX25519_EXPIRATION_TIMEOUT;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> WrapECIESX25519AEADRatchetMessage (std::shared_ptr<const I2NPMessage> msg, const uint8_t * key, uint64_t tag)
|
|
{
|
|
auto m = NewI2NPMessage ();
|
|
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
|
|
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
|
|
uint8_t nonce[12];
|
|
memset (nonce, 0, 12); // n = 0
|
|
size_t offset = 0;
|
|
memcpy (buf + offset, &tag, 8); offset += 8;
|
|
auto payload = buf + offset;
|
|
uint16_t cloveSize = msg->GetPayloadLength () + 9 + 1;
|
|
size_t len = cloveSize + 3;
|
|
payload[0] = eECIESx25519BlkGalicClove; // clove type
|
|
htobe16buf (payload + 1, cloveSize); // size
|
|
payload += 3;
|
|
*payload = 0; payload++; // flag and delivery instructions
|
|
*payload = msg->GetTypeID (); // I2NP msg type
|
|
htobe32buf (payload + 1, msg->GetMsgID ()); // msgID
|
|
htobe32buf (payload + 5, msg->GetExpiration () / 1000); // expiration in seconds
|
|
memcpy (payload + 9, msg->GetPayload (), msg->GetPayloadLength ());
|
|
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf + offset, len, buf, 8, key, nonce, buf + offset, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
|
|
return nullptr;
|
|
}
|
|
offset += len + 16;
|
|
|
|
htobe32buf (m->GetPayload (), offset);
|
|
m->len += offset + 4;
|
|
m->FillI2NPMessageHeader (eI2NPGarlic);
|
|
return m;
|
|
}
|
|
|
|
}
|
|
}
|