MixHash for SessionConfirmed processing

libi2pd/NTCP2.cpp

@@ -338,11 +338,8 @@ namespace transport
 
 		KDF3Bob ();
 		if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer + 48, m3p2Len - 16, GetH (), 32, GetK (), nonce, m3p2Buf, m3p2Len - 16, false)) // decrypt
-		{
 			// caclulate new h again for KDF data
-			memcpy (m_SessionConfirmedBuffer + 16, m_H, 32); // h || ciphertext
-			SHA256 (m_SessionConfirmedBuffer + 16, m3p2Len + 32, m_H); //h = SHA256(h || ciphertext);
-		}
+			MixHash (m_SessionConfirmedBuffer + 48, m3p2Len); // h = SHA256(h || ciphertext)
 		else
 		{
 			LogPrint (eLogWarning, "NTCP2: SessionConfirmed Part2 AEAD verification failed ");