switched to eliptical strategy

controllers/node_grpc.go

@@ -77,28 +77,21 @@ func (s *NodeServiceServer) CreateNode(ctx context.Context, req *nodepb.Object)
 	}
 	// TODO consolidate functionality around files
 	node.NetworkSettings.DefaultServerAddrs = serverAddrs
-	key, mod, e, keyErr := logic.RetrievePublicTrafficKey()
+	key, keyErr := logic.RetrievePublicTrafficKey()
 	if keyErr != nil {
 		logger.Log(0, "error retrieving key: ", keyErr.Error())
 		return nil, keyErr
 	}
-	key.N = &mod
-	key.E = e
 
 	node.TrafficKeys = models.TrafficKeys{
 		Mine:   node.TrafficKeys.Mine,
-		Mod:    node.TrafficKeys.Mod,
-		E:      node.TrafficKeys.E,
 		Server: key,
-		Smod:   *key.N,
-		SE:     key.E,
 	}
 
 	err = logic.CreateNode(&node)
 	if err != nil {
 		return nil, err
 	}
-	logger.Log(0, "made it to here")
 
 	nodeData, errN := json.Marshal(&node)
 	if errN != nil {

database/database.go

@@ -2,7 +2,6 @@ package database
 
 import (
 	"crypto/rand"
-	"crypto/rsa"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -11,7 +10,9 @@ import (
 	"github.com/google/uuid"
 	"github.com/gravitl/netmaker/logger"
 	"github.com/gravitl/netmaker/models"
+	"github.com/gravitl/netmaker/netclient/ncutils"
 	"github.com/gravitl/netmaker/servercfg"
+	"golang.org/x/crypto/nacl/box"
 )
 
 // NETWORKS_TABLE_NAME - networks table
@@ -207,18 +208,26 @@ func initializeUUID() error {
 	} else if len(records) > 0 {
 		return nil
 	}
-	var rsaPrivKey, keyErr = rsa.GenerateKey(rand.Reader, 2048)
-	if keyErr != nil {
-		return keyErr
+	// setup encryption keys
+	var trafficPubKey, trafficPrivKey, errT = box.GenerateKey(rand.Reader) // generate traffic keys
+	if errT != nil {
+		return errT
 	}
-	var rsaPublicKey = &rsaPrivKey.PublicKey
-	fmt.Printf("E: %d \n", rsaPublicKey.E)
+	tPriv, err := ncutils.ConvertKeyToBytes(trafficPrivKey)
+	if err != nil {
+		return err
+	}
+
+	tPub, err := ncutils.ConvertKeyToBytes(trafficPubKey)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("Generated Keys: %v \n---\n %v \n", trafficPrivKey, trafficPubKey)
 	telemetry := models.Telemetry{
 		UUID:           uuid.NewString(),
-		TrafficKeyPriv: *rsaPrivKey,
-		TrafficKeyPub:  *rsaPublicKey,
-		PubMod:         *rsaPublicKey.N,
-		PubE:           rsaPublicKey.E,
+		TrafficKeyPriv: tPriv,
+		TrafficKeyPub:  tPub,
 	}
 	telJSON, err := json.Marshal(&telemetry)
 	if err != nil {

logic/traffic.go

@@ -1,29 +1,27 @@
 package logic
 
 import (
-	"crypto/rsa"
 	"fmt"
-	"math/big"
 )
 
 // RetrievePrivateTrafficKey - retrieves private key of server
-func RetrievePrivateTrafficKey() (rsa.PrivateKey, error) {
+func RetrievePrivateTrafficKey() ([]byte, error) {
 	var telRecord, err = fetchTelemetryRecord()
 	if err != nil {
-		return rsa.PrivateKey{}, err
+		return nil, err
 	}
-	fmt.Printf("fetched priv key %v \n", telRecord.TrafficKeyPriv)
+	fmt.Printf("fetched priv key %v \n", string(telRecord.TrafficKeyPriv))
 
 	return telRecord.TrafficKeyPriv, nil
 }
 
 // RetrievePublicTrafficKey - retrieves public key of server
-func RetrievePublicTrafficKey() (rsa.PublicKey, big.Int, int, error) {
+func RetrievePublicTrafficKey() ([]byte, error) {
 	var telRecord, err = fetchTelemetryRecord()
 	if err != nil {
-		return rsa.PublicKey{}, big.Int{}, 0, err
+		return nil, err
 	}
-	fmt.Printf("fetched pub key %v \n", telRecord.TrafficKeyPub)
+	fmt.Printf("fetched pub key %v \n", string(telRecord.TrafficKeyPub))
 
-	return telRecord.TrafficKeyPub, telRecord.PubMod, telRecord.PubE, nil
+	return telRecord.TrafficKeyPub, nil
 }

models/structs.go

@@ -1,9 +1,6 @@
 package models
 
 import (
-	"crypto/rsa"
-	"math/big"
-
 	jwt "github.com/golang-jwt/jwt/v4"
 )
 
@@ -171,12 +168,10 @@ type ServerUpdateData struct {
 
 // Telemetry - contains UUID of the server and timestamp of last send to posthog
 type Telemetry struct {
-	UUID           string         `json:"uuid" bson:"uuid"`
-	LastSend       int64          `json:"lastsend" bson:"lastsend"`
-	TrafficKeyPriv rsa.PrivateKey `json:"traffickeypriv" bson:"traffickeypriv"`
-	TrafficKeyPub  rsa.PublicKey  `json:"traffickeypub" bson:"traffickeypub"`
-	PubMod         big.Int        `json:"pubmod" bson:"pubmod"`
-	PubE           int            `json:"pube" bson:"pube"`
+	UUID           string `json:"uuid" bson:"uuid"`
+	LastSend       int64  `json:"lastsend" bson:"lastsend"`
+	TrafficKeyPriv []byte `json:"traffickeypriv" bson:"traffickeypriv"`
+	TrafficKeyPub  []byte `json:"traffickeypub" bson:"traffickeypub"`
 }
 
 // ServerAddr - to pass to clients to tell server addresses and if it's the leader or not
@@ -187,10 +182,6 @@ type ServerAddr struct {
 
 // TrafficKeys - struct to hold public keys
 type TrafficKeys struct {
-	Mine   rsa.PublicKey `json:"mine" bson:"mine" yaml:"mine"`
-	Mod    big.Int       `json:"mod" bson:"mod" yaml:"mod"`
-	E      int           `json:"e" bson:"e" yaml:"e"`
-	Server rsa.PublicKey `json:"server" bson:"server" yaml:"server"`
-	Smod   big.Int       `json:"smod" bson:"smod" yaml:"smod"`
-	SE     int           `json:"se" bson:"se" yaml:"se"`
+	Mine   []byte `json:"mine" bson:"mine" yaml:"mine"`
+	Server []byte `json:"server" bson:"server" yaml:"server"`
 }

mq/mq.go

@@ -42,7 +42,7 @@ var Ping mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
 			return
 		}
 		fmt.Printf("length before ping decrypt %d ", len(msg.Payload()))
-		decryptedMsg, decryptErr := decryptMsg(msg.Payload())
+		decryptedMsg, decryptErr := decryptMsg(&node, msg.Payload())
 		if decryptErr != nil {
 			logger.Log(0, "error updating node ", node.ID, err.Error())
 			return
@@ -71,7 +71,7 @@ var UpdateNode mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 			logger.Log(1, "error getting node ", id, err.Error())
 			return
 		}
-		decrypted, decryptErr := decryptMsg(msg.Payload())
+		decrypted, decryptErr := decryptMsg(&currentNode, msg.Payload())
 		if decryptErr != nil {
 			logger.Log(1, "failed to decrypt message for node ", id, decryptErr.Error())
 			return

mq/util.go

@@ -1,37 +1,52 @@
 package mq
 
 import (
-	"fmt"
-
 	"github.com/gravitl/netmaker/logic"
 	"github.com/gravitl/netmaker/models"
 	"github.com/gravitl/netmaker/netclient/ncutils"
 )
 
-func decryptMsg(msg []byte) ([]byte, error) {
+func decryptMsg(node *models.Node, msg []byte) ([]byte, error) {
+	trafficKey, trafficErr := logic.RetrievePrivateTrafficKey() // get server private key
+	if trafficErr != nil {
+		return nil, trafficErr
+	}
+	serverPrivTKey, err := ncutils.ConvertBytesToKey(trafficKey)
+	if err != nil {
+		return nil, err
+	}
+	nodePubTKey, err := ncutils.ConvertBytesToKey(node.TrafficKeys.Mine)
+	if err != nil {
+		return nil, err
+	}
+
+	return ncutils.BoxDecrypt(msg, nodePubTKey, serverPrivTKey)
+}
+
+func encryptMsg(node *models.Node, msg []byte) ([]byte, error) {
+	// fetch server public key to be certain hasn't changed in transit
 	trafficKey, trafficErr := logic.RetrievePrivateTrafficKey()
 	if trafficErr != nil {
 		return nil, trafficErr
 	}
-	return ncutils.DestructMessage(string(msg), &trafficKey), nil
-}
 
-func encrypt(node *models.Node, dest string, msg []byte) ([]byte, error) {
-	fmt.Printf("original length: %d \n", len(msg))
-	node.TrafficKeys.Mine.N = &node.TrafficKeys.Mod
-	node.TrafficKeys.Mine.E = node.TrafficKeys.E
-	encrypted := ncutils.BuildMessage(msg, &node.TrafficKeys.Mine)
-	if encrypted == "" {
-		return nil, fmt.Errorf("could not encrypt message")
+	serverPrivKey, err := ncutils.ConvertBytesToKey(trafficKey)
+	if err != nil {
+		return nil, err
 	}
-	fmt.Printf("resulting length: %d \n", len(encrypted))
-	return []byte(encrypted), nil
+
+	nodePubKey, err := ncutils.ConvertBytesToKey(node.TrafficKeys.Mine)
+	if err != nil {
+		return nil, err
+	}
+
+	return ncutils.BoxEncrypt(msg, nodePubKey, serverPrivKey)
 }
 
 func publish(node *models.Node, dest string, msg []byte) error {
 	client := SetupMQTT()
 	defer client.Disconnect(250)
-	encrypted, encryptErr := encrypt(node, dest, msg)
+	encrypted, encryptErr := encryptMsg(node, msg)
 	if encryptErr != nil {
 		return encryptErr
 	}

netclient/auth/auth.go

@@ -93,14 +93,21 @@ func RetrieveSecret(network string) (string, error) {
 }
 
 // StoreTrafficKey - stores traffic key
-func StoreTrafficKey(key string, network string) error {
-	return os.WriteFile(ncutils.GetNetclientPathSpecific()+"traffic-"+network, []byte(key), 0600)
+func StoreTrafficKey(key *[32]byte, network string) error {
+	var data, err = ncutils.ConvertKeyToBytes(key)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(ncutils.GetNetclientPathSpecific()+"traffic-"+network, data, 0600)
 }
 
 // RetrieveTrafficKey - reads traffic file locally
-func RetrieveTrafficKey(network string) (string, error) {
-	dat, err := os.ReadFile(ncutils.GetNetclientPathSpecific() + "traffic-" + network)
-	return string(dat), err
+func RetrieveTrafficKey(network string) (*[32]byte, error) {
+	data, err := os.ReadFile(ncutils.GetNetclientPathSpecific() + "traffic-" + network)
+	if err != nil {
+		return nil, err
+	}
+	return ncutils.ConvertBytesToKey(data)
 }
 
 // Configuraion - struct for mac and pass

netclient/functions/daemon.go

@@ -2,7 +2,6 @@ package functions
 
 import (
 	"context"
-	"crypto/rsa"
 	"encoding/json"
 	"fmt"
 	"log"
@@ -130,7 +129,7 @@ func NodeUpdate(client mqtt.Client, msg mqtt.Message) {
 		if dataErr != nil {
 			return
 		}
-		err := json.Unmarshal(data, &newNode)
+		err := json.Unmarshal([]byte(data), &newNode)
 		if err != nil {
 			ncutils.Log("error unmarshalling node update data" + err.Error())
 			return
@@ -220,7 +219,7 @@ func UpdatePeers(client mqtt.Client, msg mqtt.Message) {
 		if dataErr != nil {
 			return
 		}
-		err := json.Unmarshal(data, &peerUpdate)
+		err := json.Unmarshal([]byte(data), &peerUpdate)
 		if err != nil {
 			ncutils.Log("error unmarshalling peer data")
 			return
@@ -369,14 +368,24 @@ func Hello(cfg *config.ClientConfig, network string) {
 }
 
 func publish(cfg *config.ClientConfig, dest string, msg []byte) error {
+	// setup the keys
+	trafficPrivKey, err := auth.RetrieveTrafficKey(cfg.Node.Network)
+	if err != nil {
+		return err
+	}
+
+	serverPubKey, err := ncutils.ConvertBytesToKey(cfg.Node.TrafficKeys.Server)
+	if err != nil {
+		return err
+	}
+
 	client := SetupMQTT(cfg)
 	defer client.Disconnect(250)
-	cfg.Node.TrafficKeys.Server.E = cfg.Node.TrafficKeys.SE
-	cfg.Node.TrafficKeys.Server.N = &cfg.Node.TrafficKeys.Smod
-	encrypted := ncutils.BuildMessage(msg, &cfg.Node.TrafficKeys.Server)
-	if encrypted == "" {
-		return fmt.Errorf("could not encrypt message")
+	encrypted, err := ncutils.BoxEncrypt(msg, serverPubKey, trafficPrivKey)
+	if err != nil {
+		return err
 	}
+
 	if token := client.Publish(dest, 0, false, encrypted); token.Wait() && token.Error() != nil {
 		return token.Error()
 	}
@@ -388,15 +397,18 @@ func parseNetworkFromTopic(topic string) string {
 }
 
 func decryptMsg(cfg *config.ClientConfig, msg []byte) ([]byte, error) {
-	diskKey, trafficErr := auth.RetrieveTrafficKey(cfg.Node.Network)
-	if trafficErr != nil {
-		return nil, trafficErr
+	// setup the keys
+	diskKey, keyErr := auth.RetrieveTrafficKey(cfg.Node.Network)
+	if keyErr != nil {
+		return nil, keyErr
 	}
-	var trafficKey rsa.PrivateKey
-	if err := json.Unmarshal([]byte(diskKey), &trafficKey); err != nil {
+
+	serverPubKey, err := ncutils.ConvertBytesToKey(cfg.Node.TrafficKeys.Server)
+	if err != nil {
 		return nil, err
 	}
-	return ncutils.DestructMessage(string(msg), &trafficKey), nil
+
+	return ncutils.BoxDecrypt(msg, serverPubKey, diskKey)
 }
 
 func shouldResub(currentServers, newServers []models.ServerAddr) bool {

netclient/functions/join.go

@@ -3,7 +3,6 @@ package functions
 import (
 	"context"
 	"crypto/rand"
-	"crypto/rsa"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -21,6 +20,7 @@ import (
 	"github.com/gravitl/netmaker/netclient/ncutils"
 	"github.com/gravitl/netmaker/netclient/server"
 	"github.com/gravitl/netmaker/netclient/wireguard"
+	"golang.org/x/crypto/nacl/box"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"google.golang.org/grpc"
 )
@@ -44,21 +44,29 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 	if cfg.Node.Password == "" {
 		cfg.Node.Password = ncutils.GenPass()
 	}
-	var rsaPrivKey, errGen = rsa.GenerateKey(rand.Reader, ncutils.KEY_SIZE)
-	if errGen != nil {
-		return errGen
+	var trafficPubKey, trafficPrivKey, errT = box.GenerateKey(rand.Reader) // generate traffic keys
+	if errT != nil {
+		return errT
 	}
+
+	// == handle keys ==
 	if err = auth.StoreSecret(cfg.Node.Password, cfg.Node.Network); err != nil {
 		return err
 	}
-	var keyData, errKeyData = json.Marshal(&rsaPrivKey)
-	if errKeyData != nil {
-		return errKeyData
-	}
-	if err = auth.StoreTrafficKey(string(keyData), cfg.Node.Network); err != nil {
+
+	if err = auth.StoreTrafficKey(trafficPrivKey, cfg.Node.Network); err != nil {
 		return err
 	}
 
+	trafficPubKeyBytes, err := ncutils.ConvertKeyToBytes(trafficPubKey)
+	if err != nil {
+		return err
+	}
+
+	cfg.Node.TrafficKeys.Mine = trafficPubKeyBytes
+	cfg.Node.TrafficKeys.Server = nil
+	// == end handle keys ==
+
 	if cfg.Node.LocalRange != "" && cfg.Node.LocalAddress == "" {
 		log.Println("local vpn, getting local address from range: " + cfg.Node.LocalRange)
 		cfg.Node.LocalAddress = getLocalIP(cfg.Node)
@@ -135,12 +143,7 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 		Endpoint:            cfg.Node.Endpoint,
 		SaveConfig:          cfg.Node.SaveConfig,
 		UDPHolePunch:        cfg.Node.UDPHolePunch,
-		TrafficKeys: models.TrafficKeys{
-			Mine:   rsaPrivKey.PublicKey,
-			Mod:    *rsaPrivKey.PublicKey.N,
-			E:      rsaPrivKey.PublicKey.E,
-			Server: rsa.PublicKey{},
-		},
+		TrafficKeys:         cfg.Node.TrafficKeys,
 	}
 
 	ncutils.Log("joining " + cfg.Network + " at " + cfg.Server.GRPCAddress)

netclient/ncutils/netclientutils.go

@@ -1,10 +1,10 @@
 package ncutils
 
 import (
+	"bytes"
 	crand "crypto/rand"
-	"crypto/rsa"
-	"crypto/sha512"
 	"crypto/tls"
+	"encoding/gob"
 	"errors"
 	"fmt"
 	"io"
@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/gravitl/netmaker/models"
+	"golang.org/x/crypto/nacl/box"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"google.golang.org/grpc"
@@ -540,6 +541,28 @@ func CheckWG() {
 	}
 }
 
+// ConvertKeyToBytes - util to convert a key to bytes to use elsewhere
+func ConvertKeyToBytes(key *[32]byte) ([]byte, error) {
+	var buffer bytes.Buffer
+	var enc = gob.NewEncoder(&buffer)
+	if err := enc.Encode(key); err != nil {
+		return nil, err
+	}
+	return buffer.Bytes(), nil
+}
+
+// ConvertBytesToKey - util to convert bytes to a key to use elsewhere
+func ConvertBytesToKey(data []byte) (*[32]byte, error) {
+	var buffer = bytes.NewBuffer(data)
+	var dec = gob.NewDecoder(buffer)
+	var result = new([32]byte)
+	var err = dec.Decode(result)
+	if err != nil {
+		return nil, err
+	}
+	return result, err
+}
+
 // ServerAddrSliceContains - sees if a string slice contains a string element
 func ServerAddrSliceContains(slice []models.ServerAddr, item models.ServerAddr) bool {
 	for _, s := range slice {
@@ -550,76 +573,98 @@ func ServerAddrSliceContains(slice []models.ServerAddr, item models.ServerAddr)
 	return false
 }
 
-// DestructMessage - reconstruct original message through chunks
-func DestructMessage(builtMsg string, priv *rsa.PrivateKey) []byte {
-	var chunks = strings.Split(builtMsg, splitKey)
-	var totalMessage = make([]byte, len(builtMsg))
-	for _, chunk := range chunks {
-		var bytes = decryptWithPrivateKey([]byte(chunk), priv)
-		if bytes == nil {
-			return nil
-		}
-		totalMessage = append(totalMessage, bytes...)
-	}
-	return totalMessage
-}
-
-// BuildMessage Build a message for publishing
-func BuildMessage(originalMessage []byte, pub *rsa.PublicKey) string {
-	chunks := getSliceChunks(originalMessage, 228)
-	var message = ""
-	for i := 0; i < len(chunks); i++ {
-		var encryptedText, encryptErr = encryptWithPublicKey(chunks[i], pub)
-		if encryptErr != nil {
-			fmt.Printf("encrypt err: %v \n", encryptErr)
-			return ""
-		}
-
-		message += string(encryptedText)
-		if i < len(chunks)-1 {
-			message += splitKey
-		}
-	}
-	return message
-}
-
-var splitKey = "|o|"
-
-func getSliceChunks(slice []byte, chunkSize int) [][]byte {
-	var chunks [][]byte
-	for i := 0; i < len(slice); i += chunkSize {
-		lastByte := i + chunkSize
-
-		if lastByte > len(slice) {
-			lastByte = len(slice)
-		}
-
-		chunks = append(chunks, slice[i:lastByte])
-	}
-
-	return chunks
-}
-
-// encryptWithPublicKey encrypts data with public key
-func encryptWithPublicKey(msg []byte, pub *rsa.PublicKey) ([]byte, error) {
-	if pub == nil {
-		return nil, errors.New("invalid public key when decrypting")
-	}
-	hash := sha512.New()
-	ciphertext, err := rsa.EncryptOAEP(hash, crand.Reader, pub, msg, []byte(""))
-	if err != nil {
+// BoxEncrypt - encrypts traffic box
+func BoxEncrypt(message []byte, recipientPubKey *[32]byte, senderPrivateKey *[32]byte) ([]byte, error) {
+	var nonce [24]byte // 192 bits of randomization
+	if _, err := io.ReadFull(crand.Reader, nonce[:]); err != nil {
 		return nil, err
 	}
 
-	return ciphertext, nil
+	encrypted := box.Seal(nonce[:], message, &nonce, recipientPubKey, senderPrivateKey)
+	return encrypted, nil
 }
 
-// decryptWithPrivateKey decrypts data with private key
-func decryptWithPrivateKey(ciphertext []byte, priv *rsa.PrivateKey) []byte {
-	hash := sha512.New()
-	plaintext, err := rsa.DecryptOAEP(hash, crand.Reader, priv, ciphertext, []byte(""))
-	if err != nil {
-		return nil
+// BoxDecrypt - decrypts traffic box
+func BoxDecrypt(encrypted []byte, senderPublicKey *[32]byte, recipientPrivateKey *[32]byte) ([]byte, error) {
+	var decryptNonce [24]byte
+	copy(decryptNonce[:], encrypted[:24])
+	decrypted, ok := box.Open(nil, encrypted[24:], &decryptNonce, senderPublicKey, recipientPrivateKey)
+	if !ok {
+		return nil, fmt.Errorf("could not decrypt message")
 	}
-	return plaintext
+	return decrypted, nil
 }
+
+// DestructMessage - reconstruct original message through chunks
+// func DestructMessage(builtMsg string, priv *rsa.PrivateKey) []byte {
+// 	var chunks = strings.Split(builtMsg, splitKey)
+// 	var totalMessage = make([]byte, len(builtMsg))
+// 	for _, chunk := range chunks {
+// 		var bytes = decryptWithPrivateKey([]byte(chunk), priv)
+// 		if bytes == nil {
+// 			return nil
+// 		}
+// 		totalMessage = append(totalMessage, bytes...)
+// 	}
+// 	return totalMessage
+// }
+
+// // BuildMessage Build a message for publishing
+// func BuildMessage(originalMessage []byte, pub *rsa.PublicKey) string {
+// 	chunks := getSliceChunks(originalMessage, 228)
+// 	var message = ""
+// 	for i := 0; i < len(chunks); i++ {
+// 		var encryptedText, encryptErr = encryptWithPublicKey(chunks[i], pub)
+// 		if encryptErr != nil {
+// 			fmt.Printf("encrypt err: %v \n", encryptErr)
+// 			return ""
+// 		}
+
+// 		message += string(encryptedText)
+// 		if i < len(chunks)-1 {
+// 			message += splitKey
+// 		}
+// 	}
+// 	return message
+// }
+
+// var splitKey = "|o|"
+
+// func getSliceChunks(slice []byte, chunkSize int) [][]byte {
+// 	var chunks [][]byte
+// 	for i := 0; i < len(slice); i += chunkSize {
+// 		lastByte := i + chunkSize
+
+// 		if lastByte > len(slice) {
+// 			lastByte = len(slice)
+// 		}
+
+// 		chunks = append(chunks, slice[i:lastByte])
+// 	}
+
+// 	return chunks
+// }
+
+// // encryptWithPublicKey encrypts data with public key
+// func encryptWithPublicKey(msg []byte, pub *rsa.PublicKey) ([]byte, error) {
+// 	if pub == nil {
+// 		return nil, errors.New("invalid public key when decrypting")
+// 	}
+// 	hash := sha512.New()
+// 	ciphertext, err := rsa.EncryptOAEP(hash, crand.Reader, pub, msg, []byte(""))
+// 	if err != nil {
+// 		return nil, err
+// 	}
+
+// 	return ciphertext, nil
+// }
+
+// // decryptWithPrivateKey decrypts data with private key
+// func decryptWithPrivateKey(ciphertext []byte, priv *rsa.PrivateKey) []byte {
+// 	hash := sha512.New()
+// 	plaintext, err := rsa.DecryptOAEP(hash, crand.Reader, priv, ciphertext, []byte(""))
+// 	if err != nil {
+// 		return nil
+// 	}
+// 	return plaintext
+// }