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i2pd
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different ElGamal and ECIES hops configs

pull/1677/head
orignal 3 years ago
parent
8b35ce3320
commit
0ae170531e
2 changed files with 97 additions and 63 deletions
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  1. 76
      libi2pd/TunnelConfig.cpp
  2. 34
      libi2pd/TunnelConfig.h

76
libi2pd/TunnelConfig.cpp
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@ -78,33 +78,12 @@ namespace tunnel
} }
} }
void TunnelHopConfig::CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx) void ElGamalTunnelHopConfig::CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx)
{ {
// fill clear text
uint8_t flag = 0; uint8_t flag = 0;
if (isGateway) flag |= TUNNEL_BUILD_RECORD_GATEWAY_FLAG; if (isGateway) flag |= TUNNEL_BUILD_RECORD_GATEWAY_FLAG;
if (isEndpoint) flag |= TUNNEL_BUILD_RECORD_ENDPOINT_FLAG; if (isEndpoint) flag |= TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
auto encryptor = ident->CreateEncryptor (nullptr);
if (IsECIES ())
{
uint8_t clearText[ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID);
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET, nextTunnelID);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET, nextIdent, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET, layerKey, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET, ivKey, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET, replyKey, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_IV_OFFSET, replyIV, 16);
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] = flag;
memset (clearText + ECIES_BUILD_REQUEST_RECORD_MORE_FLAGS_OFFSET, 0, 3); // set to 0 for compatibility
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetMinutesSinceEpoch ());
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET, 600); // +10 minutes
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID);
memset (clearText + ECIES_BUILD_REQUEST_RECORD_PADDING_OFFSET, 0, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE - ECIES_BUILD_REQUEST_RECORD_PADDING_OFFSET);
if (encryptor)
EncryptECIES (encryptor, clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx);
}
else
{
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE]; uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
htobe32buf (clearText + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID); htobe32buf (clearText + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID);
memcpy (clearText + BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET, ident->GetIdentHash (), 32); memcpy (clearText + BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET, ident->GetIdentHash (), 32);
@ -118,13 +97,23 @@ namespace tunnel
htobe32buf (clearText + BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetHoursSinceEpoch ()); htobe32buf (clearText + BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetHoursSinceEpoch ());
htobe32buf (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID); htobe32buf (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID);
RAND_bytes (clearText + BUILD_REQUEST_RECORD_PADDING_OFFSET, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE - BUILD_REQUEST_RECORD_PADDING_OFFSET); RAND_bytes (clearText + BUILD_REQUEST_RECORD_PADDING_OFFSET, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE - BUILD_REQUEST_RECORD_PADDING_OFFSET);
// encrypt
auto encryptor = ident->CreateEncryptor (nullptr);
if (encryptor) if (encryptor)
encryptor->Encrypt (clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx, false); encryptor->Encrypt (clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx, false);
}
memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)ident->GetIdentHash (), 16); memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)ident->GetIdentHash (), 16);
} }
void TunnelHopConfig::EncryptECIES (std::shared_ptr<i2p::crypto::CryptoKeyEncryptor>& encryptor, bool ElGamalTunnelHopConfig::DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText)
{
i2p::crypto::CBCDecryption decryption;
decryption.SetKey (replyKey);
decryption.SetIV (replyIV);
decryption.Decrypt (encrypted, TUNNEL_BUILD_RECORD_SIZE, clearText);
return true;
}
void ECIESTunnelHopConfig::EncryptECIES (std::shared_ptr<i2p::crypto::CryptoKeyEncryptor>& encryptor,
const uint8_t * plainText, uint8_t * encrypted, BN_CTX * ctx) const uint8_t * plainText, uint8_t * encrypted, BN_CTX * ctx)
{ {
uint8_t hepk[32]; uint8_t hepk[32];
@ -148,9 +137,34 @@ namespace tunnel
MixHash (encrypted, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE + 16); // h = SHA256(h || ciphertext) MixHash (encrypted, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE + 16); // h = SHA256(h || ciphertext)
} }
bool TunnelHopConfig::DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText) void LongECIESTunnelHopConfig::CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx)
{ {
if (IsECIES ()) // fill clear text
uint8_t flag = 0;
if (isGateway) flag |= TUNNEL_BUILD_RECORD_GATEWAY_FLAG;
if (isEndpoint) flag |= TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
uint8_t clearText[ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID);
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET, nextTunnelID);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET, nextIdent, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET, layerKey, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET, ivKey, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET, replyKey, 32);
memcpy (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_IV_OFFSET, replyIV, 16);
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] = flag;
memset (clearText + ECIES_BUILD_REQUEST_RECORD_MORE_FLAGS_OFFSET, 0, 3); // set to 0 for compatibility
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetMinutesSinceEpoch ());
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET, 600); // +10 minutes
htobe32buf (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID);
memset (clearText + ECIES_BUILD_REQUEST_RECORD_PADDING_OFFSET, 0, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE - ECIES_BUILD_REQUEST_RECORD_PADDING_OFFSET);
// encrypt
auto encryptor = ident->CreateEncryptor (nullptr);
if (encryptor)
EncryptECIES (encryptor, clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx);
memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)ident->GetIdentHash (), 16);
}
bool LongECIESTunnelHopConfig::DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText)
{ {
uint8_t nonce[12]; uint8_t nonce[12];
memset (nonce, 0, 12); memset (nonce, 0, 12);
@ -160,14 +174,6 @@ namespace tunnel
LogPrint (eLogWarning, "Tunnel: Response AEAD decryption failed"); LogPrint (eLogWarning, "Tunnel: Response AEAD decryption failed");
return false; return false;
} }
}
else
{
i2p::crypto::CBCDecryption decryption;
decryption.SetKey (replyKey);
decryption.SetIV (replyIV);
decryption.Decrypt (encrypted, TUNNEL_BUILD_RECORD_SIZE, clearText);
}
return true; return true;
} }
} }

34
libi2pd/TunnelConfig.h
Unescape View File

@ -18,7 +18,7 @@ namespace i2p
{ {
namespace tunnel namespace tunnel
{ {
struct TunnelHopConfig: public i2p::crypto::NoiseSymmetricState struct TunnelHopConfig
{ {
std::shared_ptr<const i2p::data::IdentityEx> ident; std::shared_ptr<const i2p::data::IdentityEx> ident;
i2p::data::IdentHash nextIdent; i2p::data::IdentHash nextIdent;
@ -33,16 +33,40 @@ namespace tunnel
int recordIndex; // record # in tunnel build message int recordIndex; // record # in tunnel build message
TunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r); TunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r);
virtual ~TunnelHopConfig () {};
void SetNextIdent (const i2p::data::IdentHash& ident); void SetNextIdent (const i2p::data::IdentHash& ident);
void SetReplyHop (uint32_t replyTunnelID, const i2p::data::IdentHash& replyIdent); void SetReplyHop (uint32_t replyTunnelID, const i2p::data::IdentHash& replyIdent);
void SetNext (TunnelHopConfig * n); void SetNext (TunnelHopConfig * n);
void SetPrev (TunnelHopConfig * p); void SetPrev (TunnelHopConfig * p);
bool IsECIES () const { return ident->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD; }; virtual bool IsECIES () const { return false; };
virtual void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx) = 0;
virtual bool DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText) = 0;
};
struct ElGamalTunnelHopConfig: public TunnelHopConfig
{
ElGamalTunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r):
TunnelHopConfig (r) {};
void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx); void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx);
bool DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText);
};
struct ECIESTunnelHopConfig: public TunnelHopConfig, public i2p::crypto::NoiseSymmetricState
{
ECIESTunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r):
TunnelHopConfig (r) {};
bool IsECIES () const { return true; };
void EncryptECIES (std::shared_ptr<i2p::crypto::CryptoKeyEncryptor>& encryptor, void EncryptECIES (std::shared_ptr<i2p::crypto::CryptoKeyEncryptor>& encryptor,
const uint8_t * clearText, uint8_t * encrypted, BN_CTX * ctx); const uint8_t * clearText, uint8_t * encrypted, BN_CTX * ctx);
};
struct LongECIESTunnelHopConfig: public ECIESTunnelHopConfig
{
LongECIESTunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r):
ECIESTunnelHopConfig (r) {};
void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx);
bool DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText); bool DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText);
}; };
@ -154,7 +178,11 @@ namespace tunnel
TunnelHopConfig * prev = nullptr; TunnelHopConfig * prev = nullptr;
for (const auto& it: peers) for (const auto& it: peers)
{ {
auto hop = new TunnelHopConfig (it); TunnelHopConfig * hop;
if (it->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
hop = new LongECIESTunnelHopConfig (it);
else
hop = new ElGamalTunnelHopConfig (it);
if (prev) if (prev)
prev->SetNext (hop); prev->SetNext (hop);
else else

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