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decode aepk and bepk back

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orignal 2020-01-21 21:09:19 -05:00
parent 2b2bd733e9
commit 09c6c2a4f3
1 changed files with 8 additions and 4 deletions
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12
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -181,12 +181,14 @@ namespace garlic
{
LogPrint (eLogError, "Garlic: Can't encode elligator");
return false;
}
}
uint8_t aepk[32];
i2p::crypto::GetElligator ()->Decode (out + offset, aepk); // decode back for h
offset += 32;
// KDF1
MixHash (m_RemoteStaticKey, 32); // h = SHA256(h || bpk)
MixHash (m_EphemeralKeys.GetPublicKey (), 32); // h = SHA256(h || aepk)
MixHash (aepk, 32); // h = SHA256(h || aepk)
uint8_t sharedSecret[32];
m_EphemeralKeys.Agree (m_RemoteStaticKey, sharedSecret); // x25519(aesk, bpk)
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)
@ -229,11 +231,13 @@ namespace garlic
{
LogPrint (eLogError, "Garlic: Can't encode elligator");
return false;
}
}
uint8_t bepk[32];
i2p::crypto::GetElligator ()->Decode (out + offset, bepk); // decode back for h
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)
MixHash (bepk, 32); // h = SHA256(h || bepk)
uint8_t sharedSecret[32];
m_EphemeralKeys.Agree (m_RemoteStaticKey, sharedSecret); // sharedSecret = x25519(besk, aepk)
i2p::crypto::HKDF (m_CK, sharedSecret, 32, "", m_CK); // [chainKey, key] = HKDF(chainKey, sharedSecret, "", 64)