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use Tag<64> for ratechet tags

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orignal 2021-08-01 18:42:13 -04:00
parent d88fe203e1
commit da7e41c188
2 changed files with 7 additions and 16 deletions
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12
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -31,16 +31,16 @@ namespace garlic
uint8_t keydata[64];
i2p::crypto::HKDF (rootKey, k, 32, "KDFDHRatchetStep", keydata); // keydata = HKDF(rootKey, k, "KDFDHRatchetStep", 64)
memcpy (m_NextRootKey, keydata, 32); // nextRootKey = keydata[0:31]
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "TagAndKeyGenKeys", m_KeyData.buf);
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "TagAndKeyGenKeys", m_SessionTagKeyData);
// [sessTag_ck, symmKey_ck] = HKDF(keydata[32:63], ZEROLEN, "TagAndKeyGenKeys", 64)
memcpy (m_SymmKeyCK, m_KeyData.buf + 32, 32);
memcpy (m_SymmKeyCK, (const uint8_t *)m_SessionTagKeyData + 32, 32);
m_NextSymmKeyIndex = 0;
}
void RatchetTagSet::NextSessionTagRatchet ()
{
i2p::crypto::HKDF (m_KeyData.GetSessTagCK (), nullptr, 0, "STInitialization", m_KeyData.buf); // [sessTag_ck, sesstag_constant] = HKDF(sessTag_ck, ZEROLEN, "STInitialization", 64)
memcpy (m_SessTagConstant, m_KeyData.GetSessTagConstant (), 32);
i2p::crypto::HKDF (m_SessionTagKeyData, nullptr, 0, "STInitialization", m_SessionTagKeyData); // [sessTag_ck, sesstag_constant] = HKDF(sessTag_ck, ZEROLEN, "STInitialization", 64)
memcpy (m_SessTagConstant, (const uint8_t *)m_SessionTagKeyData + 32, 32); // SESSTAG_CONSTANT = keydata[32:63]
m_NextIndex = 0;
}
@ -52,8 +52,8 @@ namespace garlic
LogPrint (eLogError, "Garlic: Tagset ", GetTagSetID (), " is empty");
return 0;
}
i2p::crypto::HKDF (m_KeyData.GetSessTagCK (), m_SessTagConstant, 32, "SessionTagKeyGen", m_KeyData.buf); // [sessTag_ck, tag] = HKDF(sessTag_chainkey, SESSTAG_CONSTANT, "SessionTagKeyGen", 64)
return m_KeyData.GetTag ();
i2p::crypto::HKDF (m_SessionTagKeyData, m_SessTagConstant, 32, "SessionTagKeyGen", m_SessionTagKeyData); // [sessTag_ck, tag] = HKDF(sessTag_chainkey, SESSTAG_CONSTANT, "SessionTagKeyGen", 64)
return m_SessionTagKeyData.GetLL ()[4]; // tag = keydata[32:39]
}
void RatchetTagSet::GetSymmKey (int index, uint8_t * key)

11
libi2pd/ECIESX25519AEADRatchetSession.h
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@ -60,16 +60,7 @@ namespace garlic
private:
union
{
uint64_t ll[8];
uint8_t buf[64];
const uint8_t * GetSessTagCK () const { return buf; }; // sessTag_chainKey = keydata[0:31]
const uint8_t * GetSessTagConstant () const { return buf + 32; }; // SESSTAG_CONSTANT = keydata[32:63]
uint64_t GetTag () const { return ll[4]; }; // tag = keydata[32:39]
} m_KeyData;
i2p::data::Tag<64> m_SessionTagKeyData;
uint8_t m_SessTagConstant[32], m_SymmKeyCK[32], m_CurrentSymmKeyCK[64], m_NextRootKey[32];
int m_NextIndex, m_NextSymmKeyIndex;
std::unordered_map<int, i2p::data::Tag<32> > m_ItermediateSymmKeys;