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new outgoing ECIESX25519AEADRatchet session

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orignal 2020-01-16 16:34:13 -05:00
parent b6800dd125
commit 67dd59125e
2 changed files with 40 additions and 0 deletions
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36
libi2pd/ECIESX25519AEADRatchetSession.cpp
View file

@ -15,6 +15,7 @@ namespace garlic
ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner): ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner):
GarlicRoutingSession (owner, true) GarlicRoutingSession (owner, true)
{ {
m_EphemeralKeys.GenerateKeys ();
// TODO : use precalculated hashes // TODO : use precalculated hashes
static const char protocolName[41] = "Noise_IKelg2+hs2_25519_ChaChaPoly_SHA256"; // 40 bytes static const char protocolName[41] = "Noise_IKelg2+hs2_25519_ChaChaPoly_SHA256"; // 40 bytes
SHA256 ((const uint8_t *)protocolName, 40, m_H); SHA256 ((const uint8_t *)protocolName, 40, m_H);
@ -129,6 +130,41 @@ namespace garlic
} }
} }
bool ECIESX25519AEADRatchetSession::NewOutgoingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
{
// we are Alice, bpk is m_StaticKey
size_t offset = 0;
if (!i2p::crypto::GetElligator ()->Encode (m_EphemeralKeys.GetPublicKey (), out + offset))
{
LogPrint (eLogError, "Garlic: Can't encode elligator");
return false;
}
offset += 32;
// KDF1
MixHash (m_StaticKey, 32); // h = SHA256(h || bpk)
MixHash (m_EphemeralKeys.GetPublicKey (), 32); // h = SHA256(h || aepk)
uint8_t sharedSecret[32], keyData[64];
m_EphemeralKeys.Agree (m_StaticKey, nullptr); // x25519(aesk, bpk)
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", keyData); // keydata = HKDF(chainKey, sharedSecret, "", 64)
memcpy (m_CK, keyData, 32); // chainKey = keydata[0:31]
// encrypt static key section
uint8_t nonce[12];
memset (nonce, 0, 12); // n = 0
if (!i2p::crypto::AEADChaCha20Poly1305 (GetOwner ()->GetEncryptionPublicKey (), 32, m_H, 32, keyData + 32, nonce, out + offset, 48, true)) // encrypt
{
LogPrint (eLogWarning, "Garlic: Static section AEAD encryption failed ");
return false;
}
MixHash (out + offset, 48); // h = SHA256(h || ciphertext)
offset += 48;
// KDF2
// TODO: // x25519 (ask, bpk)
return true;
}
std::shared_ptr<I2NPMessage> ECIESX25519AEADRatchetSession::WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) std::shared_ptr<I2NPMessage> ECIESX25519AEADRatchetSession::WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg)
{ {
// TODO: // TODO:

4
libi2pd/ECIESX25519AEADRatchetSession.h
View file

@ -4,6 +4,7 @@
#include <inttypes.h> #include <inttypes.h>
#include <functional> #include <functional>
#include "Identity.h" #include "Identity.h"
#include "Crypto.h"
#include "Garlic.h" #include "Garlic.h"
namespace i2p namespace i2p
@ -41,9 +42,12 @@ namespace garlic
void HandlePayload (const uint8_t * buf, size_t len, CloveHandler& handleClove); void HandlePayload (const uint8_t * buf, size_t len, CloveHandler& handleClove);
bool NewOutgoingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen);
private: private:
uint8_t m_H[32], m_CK[32], m_StaticKey[32]; uint8_t m_H[32], m_CK[32], m_StaticKey[32];
i2p::crypto::X25519Keys m_EphemeralKeys;
}; };
} }
} }