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datetime and padding blocks

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orignal 2020-01-23 14:26:40 -05:00
parent 205e807b66
commit fd1ee48dbe
1 changed files with 17 additions and 2 deletions
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19
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -5,6 +5,7 @@
#include "Elligator.h"
#include "Tag.h"
#include "I2PEndian.h"
#include "Timestamp.h"
#include "ECIESX25519AEADRatchetSession.h"
namespace i2p
@ -309,18 +310,32 @@ namespace garlic
std::vector<uint8_t> ECIESX25519AEADRatchetSession::CreatePayload (std::shared_ptr<const I2NPMessage> msg)
{
size_t payloadLen = 0;
size_t payloadLen = 7; // datatime
if (msg)
payloadLen += msg->GetPayloadLength () + 13;
auto leaseSet = CreateDatabaseStoreMsg (GetOwner ()->GetLeaseSet ());
if (leaseSet)
payloadLen += leaseSet->GetPayloadLength () + 13;
payloadLen += leaseSet->GetPayloadLength () + 13;
uint8_t paddingSize;
RAND_bytes (&paddingSize, 1);
paddingSize &= 0x0F; paddingSize++; // 1 - 16
payloadLen += paddingSize;
std::vector<uint8_t> v(payloadLen);
size_t offset = 0;
// DateTime
v[offset] = eECIESx25519BlkDateTime; offset++;
htobe16buf (v.data () + offset, 4); offset += 2;
htobe32buf (v.data () + offset, i2p::util::GetSecondsSinceEpoch ()); offset += 4;
// LeaseSet
if (leaseSet)
offset += CreateGarlicClove (leaseSet, v.data () + offset, payloadLen - offset);
// msg
if (msg)
offset += CreateGarlicClove (msg, v.data () + offset, payloadLen - offset);
// padding
v[offset] = eECIESx25519BlkPadding; offset++;
htobe16buf (v.data () + offset, paddingSize); offset += 2;
memset (v.data () + offset, 0, paddingSize); offset += paddingSize;
return v;
}