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Code Issues Releases Activity

decrypt flags/static section

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orignal 2019-12-17 16:34:47 -05:00
parent 521fb83e38
commit b5d55e1ffb
1 changed files with 11 additions and 0 deletions
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11
libi2pd/Garlic.cpp
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@ -849,6 +849,7 @@ namespace garlic
LogPrint (eLogError, "Garlic: Can't decode elligator"); LogPrint (eLogError, "Garlic: Can't decode elligator");
return; return;
} }
buf += 32;
memcpy (h + 32, aepk, 32); memcpy (h + 32, aepk, 32);
SHA256 (h, 64, h); // h = SHA256(h || aepk) SHA256 (h, 64, h); // h = SHA256(h || aepk)
@ -856,6 +857,16 @@ namespace garlic
Decrypt (aepk, sharedSecret, m_Ctx); // x25519 Decrypt (aepk, sharedSecret, m_Ctx); // x25519
i2p::crypto::HKDF (ck, sharedSecret, 32, "", keyData); // keydata = HKDF(chainKey, sharedSecret, "", 64) i2p::crypto::HKDF (ck, sharedSecret, 32, "", keyData); // keydata = HKDF(chainKey, sharedSecret, "", 64)
memcpy (ck, keyData, 32); // chainKey = keydata[0:31] memcpy (ck, keyData, 32); // chainKey = keydata[0:31]
// decrypt flags/static
uint8_t nonce[12], fs[32];
memset (nonce, 0, 12); // n = 0
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 32, h, 32, keyData + 32, nonce, fs, 32, false)) // decrypt
{
LogPrint (eLogWarning, "Garlic: Flags/static section AEAD verification failed ");
return;
}
buf += 48; // 32 data + 16 poly
} }
} }
} }