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X25519Keys for static key

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orignal 2018-09-08 22:08:08 -04:00
parent 1babd3a5a2
commit a8b1a86bd7
6 changed files with 37 additions and 16 deletions
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19
libi2pd/NTCP2.cpp
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@ -31,19 +31,14 @@ namespace transport
NTCP2Establisher::NTCP2Establisher ():
m_SessionRequestBuffer (nullptr), m_SessionCreatedBuffer (nullptr), m_SessionConfirmedBuffer (nullptr)
{
m_Ctx = BN_CTX_new ();
CreateEphemeralKey ();
}
NTCP2Establisher::~NTCP2Establisher ()
{
BN_CTX_free (m_Ctx);
delete[] m_SessionRequestBuffer;
delete[] m_SessionCreatedBuffer;
delete[] m_SessionConfirmedBuffer;
#if OPENSSL_X25519
EVP_PKEY_free (m_EphemeralPkey);
#endif
}
void NTCP2Establisher::MixKey (const uint8_t * inputKeyMaterial, uint8_t * derived)
@ -59,7 +54,7 @@ namespace transport
HMAC(EVP_sha256(), tempKey, 32, m_CK, 33, derived, &len);
}
void NTCP2Establisher::KeyDerivationFunction1 (const uint8_t * pub, const uint8_t * priv, const uint8_t * rs, const uint8_t * epub)
void NTCP2Establisher::KeyDerivationFunction1 (const uint8_t * pub, i2p::crypto::X25519Keys& priv, const uint8_t * rs, const uint8_t * epub)
{
static const uint8_t protocolNameHash[] =
{
@ -83,20 +78,20 @@ namespace transport
SHA256_Update (&ctx, m_H, 32);
SHA256_Update (&ctx, epub, 32);
SHA256_Final (m_H, &ctx);
// x25519 between rs and priv
// x25519 between pub and priv
uint8_t inputKeyMaterial[32];
i2p::crypto::GetEd25519 ()->ScalarMul (pub, priv, inputKeyMaterial, m_Ctx); // rs*priv
priv.Agree (pub, inputKeyMaterial);
MixKey (inputKeyMaterial, m_K);
}
void NTCP2Establisher::KDF1Alice ()
{
KeyDerivationFunction1 (m_RemoteStaticKey, GetPriv (), m_RemoteStaticKey, GetPub ());
KeyDerivationFunction1 (m_RemoteStaticKey, m_EphemeralKeys, m_RemoteStaticKey, GetPub ());
}
void NTCP2Establisher::KDF1Bob ()
{
KeyDerivationFunction1 (GetRemotePub (), i2p::context.GetNTCP2StaticPrivateKey (), i2p::context.GetNTCP2StaticPublicKey (), GetRemotePub ());
KeyDerivationFunction1 (GetRemotePub (), i2p::context.GetStaticKeys (), i2p::context.GetNTCP2StaticPublicKey (), GetRemotePub ());
}
void NTCP2Establisher::KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen, const uint8_t * epub)
@ -140,14 +135,14 @@ namespace transport
void NTCP2Establisher::KDF3Alice ()
{
uint8_t inputKeyMaterial[32];
i2p::crypto::GetEd25519 ()->ScalarMul (GetRemotePub (), i2p::context.GetNTCP2StaticPrivateKey (), inputKeyMaterial, m_Ctx);
i2p::context.GetStaticKeys ().Agree (GetRemotePub (), inputKeyMaterial);
MixKey (inputKeyMaterial, m_K);
}
void NTCP2Establisher::KDF3Bob ()
{
uint8_t inputKeyMaterial[32];
i2p::crypto::GetEd25519 ()->ScalarMul (m_RemoteStaticKey, GetPriv (), inputKeyMaterial, m_Ctx);
m_EphemeralKeys.Agree (m_RemoteStaticKey, inputKeyMaterial);
MixKey (inputKeyMaterial, m_K);
}