enable PQ encryption type by default if supported

libi2pd/Config.cpp

@@ -168,7 +168,11 @@ namespace config {
 			("shareddest.inbound.quantity", value<std::string>()->default_value("3"),  "Shared local destination inbound tunnels quantity")
 			("shareddest.outbound.quantity", value<std::string>()->default_value("3"), "Shared local destination outbound tunnels quantity")
 			("shareddest.i2cp.leaseSetType", value<std::string>()->default_value("3"), "Shared local destination's LeaseSet type")
-			("shareddest.i2cp.leaseSetEncType", value<std::string>()->default_value("0,4"), "Shared local destination's LeaseSet encryption type")
+#if OPENSSL_PQ
+			("shareddest.i2cp.leaseSetEncType", value<std::string>()->default_value("6,4,0"), "Shared local destination's LeaseSet encryption type")
+#else			
+			("shareddest.i2cp.leaseSetEncType", value<std::string>()->default_value("4,0"), "Shared local destination's LeaseSet encryption type")
+#endif			
 			("shareddest.i2p.streaming.profile", value<std::string>()->default_value("2"), "Shared local destination bandwidth usage profile. 1 - bulk(high), 2- interactive(low)")
 		;	
 		

libi2pd/Destination.cpp

@@ -1069,7 +1069,10 @@ namespace client
 		// if no param or valid crypto type use from identity
 		if (encryptionKeyTypes.empty ())
 			encryptionKeyTypes.insert ( { GetIdentity ()->GetCryptoKeyType (),
-				i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD }); // usually 0,4
+#if OPENSSL_PQ
+				i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD,
+#endif				
+				i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD }); // usually 0,4 or 0,6,4 if post quantum
 
 		for (auto& it: encryptionKeyTypes)
 		{

libi2pd_client/ClientContext.cpp

@@ -480,7 +480,11 @@ namespace client
 		options[I2CP_PARAM_STREAMING_PROFILE] = GetI2CPOption(section, I2CP_PARAM_STREAMING_PROFILE, DEFAULT_STREAMING_PROFILE);
 		options[I2CP_PARAM_STREAMING_MAX_WINDOW_SIZE] = GetI2CPOption(section, I2CP_PARAM_STREAMING_MAX_WINDOW_SIZE, i2p::stream::MAX_WINDOW_SIZE);
 		options[I2CP_PARAM_LEASESET_TYPE] = GetI2CPOption(section, I2CP_PARAM_LEASESET_TYPE, DEFAULT_LEASESET_TYPE);
-		std::string encType = GetI2CPStringOption(section, I2CP_PARAM_LEASESET_ENCRYPTION_TYPE, isServer ? "4" : "0,4");
+#if OPENSSL_PQ
+		std::string encType = GetI2CPStringOption(section, I2CP_PARAM_LEASESET_ENCRYPTION_TYPE, isServer ? "6,4" : "6,4,0");
+#else		
+		std::string encType = GetI2CPStringOption(section, I2CP_PARAM_LEASESET_ENCRYPTION_TYPE, isServer ? "4" : "4,0");
+#endif		
 		if (encType.length () > 0) options[I2CP_PARAM_LEASESET_ENCRYPTION_TYPE] = encType;
 		std::string privKey = GetI2CPStringOption(section, I2CP_PARAM_LEASESET_PRIV_KEY, "");
 		if (privKey.length () > 0) options[I2CP_PARAM_LEASESET_PRIV_KEY] = privKey;