diff --git a/libi2pd/ECIESX25519AEADRatchetSession.cpp b/libi2pd/ECIESX25519AEADRatchetSession.cpp index 513ac626..18e1c7b6 100644 --- a/libi2pd/ECIESX25519AEADRatchetSession.cpp +++ b/libi2pd/ECIESX25519AEADRatchetSession.cpp @@ -713,9 +713,13 @@ namespace garlic uint8_t paddingSize = 0; if (payloadLen) { - RAND_bytes (&paddingSize, 1); - paddingSize &= 0x0F; paddingSize++; // 1 - 16 - payloadLen += paddingSize + 3; + // don't create padding if we are close to optimal size + if (first || payloadLen + 19 <= ECIESX25519_OPTIMAL_PAYLOAD_SIZE || payloadLen > ECIESX25519_OPTIMAL_PAYLOAD_SIZE) + { + RAND_bytes (&paddingSize, 1); + paddingSize &= 0x0F; paddingSize++; // 1 - 16 + payloadLen += paddingSize + 3; + } } std::vector v(payloadLen); size_t offset = 0; diff --git a/libi2pd/ECIESX25519AEADRatchetSession.h b/libi2pd/ECIESX25519AEADRatchetSession.h index ce5e2eb4..14f97ce9 100644 --- a/libi2pd/ECIESX25519AEADRatchetSession.h +++ b/libi2pd/ECIESX25519AEADRatchetSession.h @@ -26,6 +26,9 @@ namespace garlic const int ECIESX25519_MAX_NUM_GENERATED_TAGS = 160; const int ECIESX25519_NSR_NUM_GENERATED_TAGS = 12; + const size_t ECIESX25519_OPTIMAL_PAYLOAD_SIZE = 1912; // 1912 = 1956 /* to fit 2 tunnel messages */ + // - 16 /* I2NP header */ - 16 /* poly hash */ - 8 /* tag */ - 4 /* garlic length */ + class ECIESX25519AEADRatchetSession; class RatchetTagSet {