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Code Issues Releases Activity

fill m3p2 with SessionRequest

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orignal 2018-10-26 09:58:18 -04:00
parent 883a035e5c
commit d034dab265
1 changed files with 15 additions and 11 deletions
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26
libi2pd/NTCP2.cpp
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@ -170,8 +170,17 @@ namespace transport
memset (options, 0, 16);
options[1] = 2; // ver
htobe16buf (options + 2, paddingLength); // padLen
m3p2Len = i2p::context.GetRouterInfo ().GetBufferLen () + 20; // (RI header + RI + MAC for now) TODO: implement options
// m3p2Len
auto bufLen = i2p::context.GetRouterInfo ().GetBufferLen ();
m3p2Len = bufLen + 4 + 16; // (RI header + RI + MAC for now) TODO: implement options
htobe16buf (options + 4, m3p2Len);
// fill m3p2 payload (RouterInfo block)
m_SessionConfirmedBuffer = new uint8_t[m3p2Len + 48]; // m3p1 is 48 bytes
uint8_t * m3p2 = m_SessionConfirmedBuffer + 48;
m3p2[0] = eNTCP2BlkRouterInfo; // block
htobe16buf (m3p2 + 1, bufLen + 1); // flag + RI
m3p2[3] = 0; // flag
memcpy (m3p2 + 4, i2p::context.GetRouterInfo ().GetBuffer (), bufLen); // TODO: own RI should be protected by mutex
// 2 bytes reserved
htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsA
// 4 bytes reserved
@ -223,8 +232,7 @@ namespace transport
SHA256_Update (&ctx1, m_SessionCreatedBuffer + 64, paddingLength);
SHA256_Final (m_H, &ctx1);
}
// part1 48 bytes
m_SessionConfirmedBuffer = new uint8_t[m3p2Len + 48];
// part1 48 bytes
i2p::crypto::AEADChaCha20Poly1305 (i2p::context.GetNTCP2StaticPublicKey (), 32, m_H, 32, m_K, nonce, m_SessionConfirmedBuffer, 48, true); // encrypt
}
@ -237,18 +245,14 @@ namespace transport
SHA256_Update (&ctx, m_H, 32);
SHA256_Update (&ctx, m_SessionConfirmedBuffer, 48);
SHA256_Final (m_H, &ctx);
// fill and encrypt
uint8_t * buf = m_SessionConfirmedBuffer + 48;
buf[0] = eNTCP2BlkRouterInfo; // block
htobe16buf (buf + 1, i2p::context.GetRouterInfo ().GetBufferLen () + 1); // flag + RI
buf[3] = 0; // flag
memcpy (buf + 4, i2p::context.GetRouterInfo ().GetBuffer (), i2p::context.GetRouterInfo ().GetBufferLen ());
// encrypt m3p2, it must be filled in SessionRequest
KDF3Alice ();
i2p::crypto::AEADChaCha20Poly1305 (buf, m3p2Len - 16, m_H, 32, m_K, nonce, buf, m3p2Len, true); // encrypt
uint8_t * m3p2 = m_SessionConfirmedBuffer + 48;
i2p::crypto::AEADChaCha20Poly1305 (m3p2, m3p2Len - 16, m_H, 32, m_K, nonce, m3p2, m3p2Len, true); // encrypt
// update h again
SHA256_Init (&ctx);
SHA256_Update (&ctx, m_H, 32);
SHA256_Update (&ctx, buf, m3p2Len);
SHA256_Update (&ctx, m3p2, m3p2Len);
SHA256_Final (m_H, &ctx); //h = SHA256(h || ciphertext)
}