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i2pd
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added ShortECIESTunnelHopConfig

pull/1677/head
orignal 4 years ago
parent
0ae170531e
commit
aace644815
3 changed files with 58 additions and 14 deletions
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  1. 1
      libi2pd/I2NPProtocol.h
  2. 59
      libi2pd/TunnelConfig.cpp
  3. 12
      libi2pd/TunnelConfig.h

1
libi2pd/I2NPProtocol.h
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@ -113,6 +113,7 @@ namespace i2p @@ -113,6 +113,7 @@ namespace i2p
const size_t SHORT_REQUEST_RECORD_REQUEST_TIME_OFFSET = SHORT_REQUEST_RECORD_LAYER_ENCRYPTION_TYPE + 1;
const size_t SHORT_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET = SHORT_REQUEST_RECORD_REQUEST_TIME_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET = SHORT_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_PADDING_OFFSET = SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_CLEAR_TEXT_SIZE = 154;
enum I2NPMessageType

59
libi2pd/TunnelConfig.cpp
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@ -113,9 +113,10 @@ namespace tunnel @@ -113,9 +113,10 @@ namespace tunnel
return true;
}
void ECIESTunnelHopConfig::EncryptECIES (std::shared_ptr<i2p::crypto::CryptoKeyEncryptor>& encryptor,
const uint8_t * plainText, uint8_t * encrypted, BN_CTX * ctx)
void ECIESTunnelHopConfig::EncryptECIES (const uint8_t * plainText, size_t len, uint8_t * encrypted)
{
auto encryptor = ident->CreateEncryptor (nullptr);
if (!encryptor) return;
uint8_t hepk[32];
encryptor->Encrypt (nullptr, hepk, nullptr, false);
i2p::crypto::InitNoiseNState (*this, hepk);
@ -128,13 +129,19 @@ namespace tunnel @@ -128,13 +129,19 @@ namespace tunnel
MixKey (sharedSecret);
uint8_t nonce[12];
memset (nonce, 0, 12);
if (!i2p::crypto::AEADChaCha20Poly1305 (plainText, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE, m_H, 32,
m_CK + 32, nonce, encrypted, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE + 16, true)) // encrypt
if (!i2p::crypto::AEADChaCha20Poly1305 (plainText, len, m_H, 32, m_CK + 32, nonce, encrypted, len + 16, true)) // encrypt
{
LogPrint (eLogWarning, "Tunnel: Plaintext AEAD encryption failed");
return;
}
MixHash (encrypted, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE + 16); // h = SHA256(h || ciphertext)
MixHash (encrypted, len + 16); // h = SHA256(h || ciphertext)
}
bool ECIESTunnelHopConfig::DecryptECIES (const uint8_t * encrypted, size_t len, uint8_t * clearText)
{
uint8_t nonce[12];
memset (nonce, 0, 12);
return i2p::crypto::AEADChaCha20Poly1305 (encrypted, len - 16, m_H, 32, m_CK, nonce, clearText, len - 16, false); // decrypt
}
void LongECIESTunnelHopConfig::CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx)
@ -158,18 +165,46 @@ namespace tunnel @@ -158,18 +165,46 @@ namespace tunnel
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);
EncryptECIES (clearText, ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
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];
memset (nonce, 0, 12);
if (!i2p::crypto::AEADChaCha20Poly1305 (encrypted, TUNNEL_BUILD_RECORD_SIZE - 16,
m_H, 32, m_CK, nonce, clearText, TUNNEL_BUILD_RECORD_SIZE - 16, false)) // decrypt
if (!DecryptECIES (encrypted, TUNNEL_BUILD_RECORD_SIZE, clearText))
{
LogPrint (eLogWarning, "Tunnel: Response AEAD decryption failed");
return false;
}
return true;
}
void ShortECIESTunnelHopConfig::CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx)
{
// 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[SHORT_REQUEST_RECORD_CLEAR_TEXT_SIZE ];
htobe32buf (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID);
htobe32buf (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET, nextTunnelID);
memcpy (clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET, nextIdent, 32);
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] = flag;
memset (clearText + SHORT_REQUEST_RECORD_MORE_FLAGS_OFFSET, 0, 2);
clearText[SHORT_REQUEST_RECORD_LAYER_ENCRYPTION_TYPE] = 0; // AES
htobe32buf (clearText + SHORT_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetMinutesSinceEpoch ());
htobe32buf (clearText + SHORT_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET , 600); // +10 minutes
htobe32buf (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID);
memset (clearText + SHORT_REQUEST_RECORD_PADDING_OFFSET, 0, SHORT_REQUEST_RECORD_CLEAR_TEXT_SIZE - SHORT_REQUEST_RECORD_PADDING_OFFSET);
// TODO: derive layer and reply keys
// encrypt
EncryptECIES (clearText, SHORT_REQUEST_RECORD_CLEAR_TEXT_SIZE, record + SHORT_REQUEST_RECORD_ENCRYPTED_OFFSET);
memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)ident->GetIdentHash (), 16);
}
bool ShortECIESTunnelHopConfig::DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText)
{
if (!DecryptECIES (encrypted, SHORT_TUNNEL_BUILD_RECORD_SIZE, clearText))
{
LogPrint (eLogWarning, "Tunnel: Response AEAD decryption failed");
return false;

12
libi2pd/TunnelConfig.h
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@ -58,8 +58,8 @@ namespace tunnel @@ -58,8 +58,8 @@ namespace tunnel
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,
const uint8_t * clearText, uint8_t * encrypted, BN_CTX * ctx);
void EncryptECIES (const uint8_t * clearText, size_t len, uint8_t * encrypted);
bool DecryptECIES (const uint8_t * encrypted, size_t len, uint8_t * clearText);
};
struct LongECIESTunnelHopConfig: public ECIESTunnelHopConfig
@ -69,6 +69,14 @@ namespace tunnel @@ -69,6 +69,14 @@ namespace tunnel
void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx);
bool DecryptBuildResponseRecord (const uint8_t * encrypted, uint8_t * clearText);
};
struct ShortECIESTunnelHopConfig: public ECIESTunnelHopConfig
{
ShortECIESTunnelHopConfig (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);
};
class TunnelConfig
{

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