From 69194118dfe3c6e0201efc3db6671bbf1d81e32e Mon Sep 17 00:00:00 2001 From: orignal Date: Sat, 13 Jun 2020 21:24:16 -0400 Subject: [PATCH] generate random padding length in bulk --- libi2pd/ECIESX25519AEADRatchetSession.cpp | 9 +++++++-- libi2pd/ECIESX25519AEADRatchetSession.h | 3 ++- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/libi2pd/ECIESX25519AEADRatchetSession.cpp b/libi2pd/ECIESX25519AEADRatchetSession.cpp index ad91382f..87fd13ed 100644 --- a/libi2pd/ECIESX25519AEADRatchetSession.cpp +++ b/libi2pd/ECIESX25519AEADRatchetSession.cpp @@ -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; diff --git a/libi2pd/ECIESX25519AEADRatchetSession.h b/libi2pd/ECIESX25519AEADRatchetSession.h index d121842d..727c48ac 100644 --- a/libi2pd/ECIESX25519AEADRatchetSession.h +++ b/libi2pd/ECIESX25519AEADRatchetSession.h @@ -188,7 +188,8 @@ namespace garlic std::list > m_AckRequests; // (tagsetid, index) bool m_SendReverseKey = false, m_SendForwardKey = false; std::unique_ptr m_NextReceiveRatchet, m_NextSendRatchet; - + uint8_t m_PaddingSizes[32], m_NextPaddingSize; + public: // for HTTP only