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send response to recived datagram from ECIESX25519AEADRatchet session

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orignal 2020-05-16 19:10:17 -04:00
parent 1e4d2fd053
commit 0b1cfb2102
2 changed files with 20 additions and 10 deletions

21
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -641,6 +641,7 @@ namespace garlic
{
auto payload = CreatePayload (msg, m_State != eSessionStateEstablished);
size_t len = payload.size ();
if (!len) return nullptr;
auto m = NewI2NPMessage (len + 100); // 96 + 4
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
@ -708,11 +709,14 @@ namespace garlic
{
payloadLen += 6;
if (m_NextSendRatchet->newKey) payloadLen += 32;
}
uint8_t paddingSize = 0;
if (payloadLen)
{
RAND_bytes (&paddingSize, 1);
paddingSize &= 0x0F; paddingSize++; // 1 - 16
payloadLen += paddingSize + 3;
}
uint8_t paddingSize;
RAND_bytes (&paddingSize, 1);
paddingSize &= 0x0F; paddingSize++; // 1 - 16
payloadLen += paddingSize + 3;
std::vector<uint8_t> v(payloadLen);
size_t offset = 0;
// DateTime
@ -785,9 +789,12 @@ namespace garlic
}
}
// padding
v[offset] = eECIESx25519BlkPadding; offset++;
htobe16buf (v.data () + offset, paddingSize); offset += 2;
memset (v.data () + offset, 0, paddingSize); offset += paddingSize;
if (paddingSize)
{
v[offset] = eECIESx25519BlkPadding; offset++;
htobe16buf (v.data () + offset, paddingSize); offset += 2;
memset (v.data () + offset, 0, paddingSize); offset += paddingSize;
}
return v;
}