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store intermediate symmetric keys

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orignal 2020-04-16 21:30:18 -04:00
parent f4798d05e7
commit f9175db28e
2 changed files with 25 additions and 17 deletions
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31
libi2pd/ECIESX25519AEADRatchetSession.cpp
View file

@ -44,26 +44,35 @@ namespace garlic
void RatchetTagSet::GetSymmKey (int index, uint8_t * key)
{
if (m_NextSymmKeyIndex > 0 && index >= m_NextSymmKeyIndex)
if (index >= m_NextSymmKeyIndex)
{
auto num = index + 1 - m_NextSymmKeyIndex;
if (!m_NextSymmKeyIndex)
{
i2p::crypto::HKDF (m_SymmKeyCK, nullptr, 0, "SymmetricRatchet", m_CurrentSymmKeyCK); // keydata_0 = HKDF(symmKey_ck, SYMMKEY_CONSTANT, "SymmetricRatchet", 64)
m_NextSymmKeyIndex = 1;
num--;
}
for (int i = 0; i < num; i++)
{
i2p::crypto::HKDF (m_CurrentSymmKeyCK, nullptr, 0, "SymmetricRatchet", m_CurrentSymmKeyCK);
if (i < num - 1)
m_ItermediateSymmKeys.emplace (m_NextSymmKeyIndex + i, m_CurrentSymmKeyCK + 32);
}
m_NextSymmKeyIndex += num;
memcpy (key, m_CurrentSymmKeyCK + 32, 32);
}
else
CalculateSymmKeyCK (index, key);
}
void RatchetTagSet::CalculateSymmKeyCK (int index, uint8_t * key)
{
// TODO: store intermediate keys
uint8_t currentSymmKeyCK[64];
i2p::crypto::HKDF (m_SymmKeyCK, nullptr, 0, "SymmetricRatchet", currentSymmKeyCK); // keydata_0 = HKDF(symmKey_ck, SYMMKEY_CONSTANT, "SymmetricRatchet", 64)
for (int i = 0; i < index; i++)
i2p::crypto::HKDF (currentSymmKeyCK, nullptr, 0, "SymmetricRatchet", currentSymmKeyCK); // keydata_n = HKDF(symmKey_chainKey_(n-1), SYMMKEY_CONSTANT, "SymmetricRatchet", 64)
memcpy (key, currentSymmKeyCK + 32, 32);
auto it = m_ItermediateSymmKeys.find (index);
if (it != m_ItermediateSymmKeys.end ())
{
memcpy (key, it->second, 32);
m_ItermediateSymmKeys.erase (it);
}
else
LogPrint (eLogError, "Garlic: Missing symmetric key for index ", index);
}
}
ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner):

7
libi2pd/ECIESX25519AEADRatchetSession.h
View file

@ -7,9 +7,11 @@
#include <memory>
#include <vector>
#include <list>
#include <unordered_map>
#include "Identity.h"
#include "Crypto.h"
#include "Garlic.h"
#include "Tag.h"
namespace i2p
{
@ -25,10 +27,6 @@ namespace garlic
int GetNextIndex () const { return m_NextIndex; };
void GetSymmKey (int index, uint8_t * key);
private:
void CalculateSymmKeyCK (int index, uint8_t * key);
private:
union
@ -43,6 +41,7 @@ namespace garlic
} m_KeyData;
uint8_t m_SessTagConstant[32], m_SymmKeyCK[32], m_CurrentSymmKeyCK[64];
int m_NextIndex, m_NextSymmKeyIndex;
std::unordered_map<int, i2p::data::Tag<32> > m_ItermediateSymmKeys;
};
enum ECIESx25519BlockType