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shorter padding for optimal packet length

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orignal 2020-05-19 19:03:12 -04:00
parent 3db4421aa7
commit 7ebf2f010c
1 changed files with 11 additions and 5 deletions
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16
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -716,12 +716,18 @@ namespace garlic
uint8_t paddingSize = 0; uint8_t paddingSize = 0;
if (payloadLen) if (payloadLen)
{ {
// don't create padding if we are close to optimal size int delta = (int)ECIESX25519_OPTIMAL_PAYLOAD_SIZE - (int)payloadLen;
if (first || payloadLen + 19 <= ECIESX25519_OPTIMAL_PAYLOAD_SIZE || payloadLen > ECIESX25519_OPTIMAL_PAYLOAD_SIZE) if (delta < 0 || delta > 3) // don't create padding if we are close to optimal size
{ {
RAND_bytes (&paddingSize, 1); RAND_bytes (&paddingSize, 1);
paddingSize &= 0x0F; paddingSize++; // 1 - 16 paddingSize &= 0x0F; // 0 - 15
payloadLen += paddingSize + 3; if (delta > 3)
{
delta -= 3;
if (paddingSize >= delta) paddingSize %= delta;
}
paddingSize++;
payloadLen += paddingSize + 3;
} }
} }
std::vector<uint8_t> v(payloadLen); std::vector<uint8_t> v(payloadLen);