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session decryption - tags

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orignal 2014-07-07 22:25:32 -04:00
parent 13fec9bdfc
commit 38115b7dda
2 changed files with 42 additions and 15 deletions
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30
Garlic.cpp
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@ -249,11 +249,18 @@ namespace garlic
for (auto it: m_Sessions)
delete it.second;
m_Sessions.clear ();
for (auto it: m_SessionDecryptions)
delete it;
m_SessionDecryptions.clear ();
// TODO: delete remaining session decryptions
m_SessionTags.clear ();
}
void GarlicRouting::AddSessionKey (const uint8_t * key, const uint8_t * tag)
{
SessionDecryption * decryption = new SessionDecryption;
decryption->SetKey (key);
decryption->SetTagCount (1);
m_SessionTags[SessionTag(tag)] = decryption;
}
I2NPMessage * GarlicRouting::WrapSingleMessage (const i2p::data::RoutingDestination& destination, I2NPMessage * msg)
{
auto it = m_Sessions.find (destination.GetIdentHash ());
@ -305,7 +312,9 @@ namespace garlic
CryptoPP::SHA256().CalculateDigest(iv, buf, 32);
it->second->SetIV (iv);
it->second->Decrypt (buf + 32, length - 32, buf + 32);
it->second->UseTag ();
HandleAESBlock (buf + 32, length - 32, it->second);
if (!it->second->GetTagCount ()) delete it->second; // all tags were used
m_SessionTags.erase (it); // tag might be used only once
}
else
@ -319,8 +328,7 @@ namespace garlic
pool ? pool->GetEncryptionPrivateKey () : i2p::context.GetPrivateKey (),
buf, (uint8_t *)&elGamal, true))
{
i2p::crypto::CBCDecryption * decryption = new i2p::crypto::CBCDecryption;
m_SessionDecryptions.push_back (decryption);
SessionDecryption * decryption = new SessionDecryption;
decryption->SetKey (elGamal.sessionKey);
uint8_t iv[32]; // IV is first 16 bytes
CryptoPP::SHA256().CalculateDigest(iv, elGamal.preIV, 32);
@ -334,12 +342,16 @@ namespace garlic
DeleteI2NPMessage (msg);
}
void GarlicRouting::HandleAESBlock (uint8_t * buf, size_t len, i2p::crypto::CBCDecryption * decryption)
void GarlicRouting::HandleAESBlock (uint8_t * buf, size_t len, SessionDecryption * decryption)
{
uint16_t tagCount = be16toh (*(uint16_t *)buf);
buf += 2;
for (int i = 0; i < tagCount; i++)
m_SessionTags[SessionTag(buf + i*32)] = decryption;
buf += 2;
if (tagCount > 0)
{
decryption->SetTagCount (tagCount);
for (int i = 0; i < tagCount; i++)
m_SessionTags[SessionTag(buf + i*32)] = decryption;
}
buf += tagCount*32;
uint32_t payloadSize = be32toh (*(uint32_t *)buf);
if (payloadSize > len)