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generate random padding length in bulk

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orignal 2020-06-13 21:24:16 -04:00
parent 49a19a52c8
commit 69194118df
2 changed files with 9 additions and 3 deletions
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9
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -96,6 +96,7 @@ namespace garlic
ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner, bool attachLeaseSet):
GarlicRoutingSession (owner, attachLeaseSet)
{
RAND_bytes (m_PaddingSizes, 32); m_NextPaddingSize = 0;
ResetKeys ();
}
@ -745,8 +746,12 @@ namespace garlic
int delta = (int)ECIESX25519_OPTIMAL_PAYLOAD_SIZE - (int)payloadLen;
if (delta < 0 || delta > 3) // don't create padding if we are close to optimal size
{
RAND_bytes (&paddingSize, 1);
paddingSize &= 0x0F; // 0 - 15
paddingSize = m_PaddingSizes[m_NextPaddingSize++] & 0x0F; // 0 - 15
if (m_NextPaddingSize >= 32)
{
RAND_bytes (m_PaddingSizes, 32);
m_NextPaddingSize = 0;
}
if (delta > 3)
{
delta -= 3;

3
libi2pd/ECIESX25519AEADRatchetSession.h
View File

@ -188,7 +188,8 @@ namespace garlic
std::list<std::pair<uint16_t, int> > m_AckRequests; // (tagsetid, index)
bool m_SendReverseKey = false, m_SendForwardKey = false;
std::unique_ptr<DHRatchet> m_NextReceiveRatchet, m_NextSendRatchet;
uint8_t m_PaddingSizes[32], m_NextPaddingSize;
public:
// for HTTP only