check routers with non ElGamal encryptions for lookup, publish and tunnel build

libi2pd/Destination.cpp

@@ -559,7 +559,9 @@ namespace client
 		m_ExcludedFloodfills.insert (floodfill->GetIdentHash ());
 		LogPrint (eLogDebug, "Destination: Publish LeaseSet of ", GetIdentHash ().ToBase32 ());
 		RAND_bytes ((uint8_t *)&m_PublishReplyToken, 4);
-		auto msg = WrapMessage (floodfill, i2p::CreateDatabaseStoreMsg (leaseSet, m_PublishReplyToken, inbound));
+		auto msg = i2p::CreateDatabaseStoreMsg (leaseSet, m_PublishReplyToken, inbound);
+		if (floodfill->GetIdentity ()->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ELGAMAL) // TODO: remove when implemented
+			msg = WrapMessage (floodfill, msg);
 		m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
 		m_PublishConfirmationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishConfirmationTimer,
 			shared_from_this (), std::placeholders::_1));
@@ -754,9 +756,10 @@ namespace client
 			else	
 				AddSessionKey (replyKey, replyTag);
 
-			auto msg = WrapMessage (nextFloodfill,
-				CreateLeaseSetDatabaseLookupMsg (dest, request->excluded,
-					request->replyTunnel, replyKey, replyTag, isECIES));
+			auto msg = CreateLeaseSetDatabaseLookupMsg (dest, request->excluded,
+				request->replyTunnel, replyKey, replyTag, isECIES);
+			if (nextFloodfill->GetIdentity ()->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ELGAMAL) // TODO: remove when implemented
+				msg = WrapMessage (nextFloodfill, msg);
 			request->outboundTunnel->SendTunnelDataMsg (
 				{
 					i2p::tunnel::TunnelMessageBlock

libi2pd/RouterInfo.cpp

@@ -153,12 +153,6 @@ namespace data
 			m_IsUnreachable = true;
 			return;
 		}
-		if (m_RouterIdentity->GetCryptoKeyType () != CRYPTO_KEY_TYPE_ELGAMAL)
-		{
-			// we support ElGamal only. TODO: remove later
-			m_IsUnreachable = true;
-			return;	
-		}
 		if (verifySignature)
 		{
 			// reject RSA signatures

libi2pd/TunnelConfig.h

@@ -112,9 +112,20 @@ namespace tunnel
 			RAND_bytes (clearText + BUILD_REQUEST_RECORD_PADDING_OFFSET, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE - BUILD_REQUEST_RECORD_PADDING_OFFSET);
 			auto encryptor = ident->CreateEncryptor (nullptr);
 			if (encryptor)
-				encryptor->Encrypt (clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx, false);
+			{
+				if (ident->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RATCHET)
+					EncryptECIES (encryptor, clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx);
+				else	
+					encryptor->Encrypt (clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx, false);
+			}	
 			memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)ident->GetIdentHash (), 16);
 		}
+
+		void EncryptECIES (std::shared_ptr<i2p::crypto::CryptoKeyEncryptor>& encryptor, 
+			const uint8_t * clearText, uint8_t * encrypted, BN_CTX * ctx) const
+		{
+			memset (encrypted, 0, 512); // TODO: implement
+		}	
 	};
 
 	class TunnelConfig