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random non-zero padding

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orignal 2015-06-26 16:06:59 -04:00
parent be1a4548e6
commit bf4c33325c
2 changed files with 17 additions and 5 deletions
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16
TunnelGateway.cpp
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@ -10,6 +10,14 @@ namespace i2p
{
namespace tunnel
{
TunnelGatewayBuffer::TunnelGatewayBuffer (uint32_t tunnelID): m_TunnelID (tunnelID),
m_CurrentTunnelDataMsg (nullptr), m_RemainingSize (0)
{
context.GetRandomNumberGenerator ().GenerateBlock (m_NonZeroRandomBuffer, TUNNEL_DATA_MAX_PAYLOAD_SIZE);
for (size_t i = 0; i < TUNNEL_DATA_MAX_PAYLOAD_SIZE; i++)
if (!m_NonZeroRandomBuffer[i]) m_NonZeroRandomBuffer[i] = 1;
}
TunnelGatewayBuffer::~TunnelGatewayBuffer ()
{
}
@ -160,13 +168,17 @@ namespace tunnel
payload[-1] = 0; // zero
ptrdiff_t paddingSize = payload - buf - 25; // 25 = 24 + 1
if (paddingSize > 0)
memset (buf + 24, 1, paddingSize); // padding TODO: fill with random data
{
// non-zero padding
auto randomOffset = rnd.GenerateWord32 (0, TUNNEL_DATA_MAX_PAYLOAD_SIZE - paddingSize);
memcpy (buf + 24, m_NonZeroRandomBuffer + randomOffset, paddingSize);
}
// we can't fill message header yet because encryption is required
m_TunnelDataMsgs.push_back (m_CurrentTunnelDataMsg);
m_CurrentTunnelDataMsg = nullptr;
}
void TunnelGateway::SendTunnelDataMsg (const TunnelMessageBlock& block)
{
if (block.data)