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create I2NP blocks

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orignal 2018-12-02 17:24:31 -05:00
parent 7efb47fed4
commit 5c3d0fc02c
1 changed files with 17 additions and 12 deletions
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29
libi2pd/NTCP2.cpp
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@ -955,11 +955,18 @@ namespace transport
size_t totalLen = 0;
std::vector<std::pair<uint8_t *, size_t> > encryptBufs;
std::vector<boost::asio::const_buffer> bufs;
std::shared_ptr<I2NPMessage> first, last;
std::shared_ptr<I2NPMessage> first;
uint8_t * macBuf = nullptr;
for (auto& it: msgs)
{
it->ToNTCP2 ();
auto buf = it->GetNTCP2Header ();
auto len = it->GetNTCP2Length ();
// block header
buf -= 3;
buf[0] = eNTCP2BlkI2NPMessage; // blk
htobe16buf (buf + 1, len); // size
len += 3;
encryptBufs.push_back (std::make_pair (buf, len));
if (it == *msgs.begin ()) // first message
{
@ -972,35 +979,33 @@ namespace transport
// if it's long enough we add padding and MAC to it
// allocate 16 bytes for MAC
len += 16;
last = it;
// create padding block
auto paddingLen = CreatePaddingBlock (totalLen + len, buf + len, it->maxLen - len);
len += paddingLen;
totalLen += paddingLen;
it->len += paddingLen;
macBuf = buf + len;
}
bufs.push_back (boost::asio::buffer (buf, len));
totalLen += len;
}
uint8_t nonce[12];
CreateNonce (m_SendSequenceNumber, nonce); m_SendSequenceNumber++;
if (last)
i2p::crypto::AEADChaCha20Poly1305Encrypt (encryptBufs, m_SendKey, nonce, last->GetNTCP2Header () + last->GetNTCP2Length ());
else // last block was not enough for MAC
if (!macBuf) // last block was not enough for MAC
{
// allocate send buffer
m_NextSendBuffer = new uint8_t[287]; // can be any size > 16, we just allocate 287 frequently
// crate padding block
auto paddingLen = CreatePaddingBlock (totalLen, m_NextSendBuffer, 287 - 16);
// and padding block to encrypt and send
encryptBufs.push_back (std::make_pair (m_NextSendBuffer, paddingLen));
i2p::crypto::AEADChaCha20Poly1305Encrypt (encryptBufs, m_SendKey, nonce, m_NextSendBuffer + paddingLen);
encryptBufs.push_back (std::make_pair (m_NextSendBuffer, paddingLen));
bufs.push_back (boost::asio::buffer (m_NextSendBuffer, paddingLen + 16));
macBuf = m_NextSendBuffer + paddingLen;
totalLen += paddingLen;
}
SetNextSentFrameLength (totalLen + 16, first->GetNTCP2Header () - 2); // right before first block
}
uint8_t nonce[12];
CreateNonce (m_SendSequenceNumber, nonce); m_SendSequenceNumber++;
i2p::crypto::AEADChaCha20Poly1305Encrypt (encryptBufs, m_SendKey, nonce, macBuf); // encrypt buffers
SetNextSentFrameLength (totalLen + 16, first->GetNTCP2Header () - 2); // frame length right before first block
// send buffers
m_IsSending = true;