Clean up code

fileCrypto.go

@@ -29,7 +29,8 @@ func EncryptFile(filePath string, newFilePath string, sharedKey string) {
 	// Encode md5 hash bytes into hexadecimal
 	hashedKey := hex.EncodeToString(md5Hash.Sum(nil))
 	// Create new AES cipher
-	block, _ := aes.NewCipher([]byte(hashedKey))
+	block, err := aes.NewCipher([]byte(hashedKey))
+	if err != nil { log.Fatal().Err(err).Msg("Error creating AES cipher") }
 	// Create GCM for AES cipher
 	gcm, err := cipher.NewGCM(block)
 	if err != nil { log.Fatal().Err(err).Msg("Error creating GCM") }
@@ -47,6 +48,7 @@ func EncryptFile(filePath string, newFilePath string, sharedKey string) {
 	defer newFile.Close()
 	// Write ciphertext to new file
 	bytesWritten, err := newFile.Write(ciphertext)
+	if err != nil { log.Fatal().Err(err).Msg("Error writing to file") }
 	// Log bytes written and to which file
 	log.Info().Str("file", filepath.Base(newFilePath)).Msg("Wrote " + strconv.Itoa(bytesWritten) + " bytes")
 }
@@ -81,6 +83,7 @@ func DecryptFile(filePath string, newFilePath string, sharedKey string) {
 	defer newFile.Close()
 	// Write ciphertext to new file
 	bytesWritten, err := newFile.Write(plaintext)
+	if err != nil { log.Fatal().Err(err).Msg("Error writing to file") }
 	// Log bytes written and to which file
 	log.Info().Str("file", filepath.Base(newFilePath)).Msg("Wrote " + strconv.Itoa(bytesWritten) + " bytes")
 }

files.go

@@ -38,7 +38,7 @@ func SendFiles(dir string) {
 	// Instantiate http.Server struct
 	srv := &http.Server{}
 	// Listen on all ipv4 addresses on port 9898
-	listener, err := net.Listen("tcp4", ":9898")
+	listener, err := net.Listen("tcp", ":9898")
 	if err != nil { log.Fatal().Err(err).Msg("Error starting listener") }
 
 	// If client connects to /:filePath
@@ -73,7 +73,7 @@ func SendFiles(dir string) {
 		// For each file in listing
 		for _, file := range dirListing {
 			// If the file is not the key
-			if !strings.Contains(file.Name(), "savedKey.aesKey") {
+			if !strings.Contains(file.Name(), "key.aes") {
 				// Append the file path to indexSlice
 				indexSlice = append(indexSlice, dir + "/" + file.Name())
 			}
@@ -90,7 +90,7 @@ func SendFiles(dir string) {
 		// Inform user a client has requested the key
 		log.Info().Msg("GET Key")
 		// Read saved key
-		key, err := ioutil.ReadFile(dir + "/savedKey.aesKey")
+		key, err := ioutil.ReadFile(dir + "/key.aes")
 		if err != nil { log.Fatal().Err(err).Msg("Error reading key") }
 		// Write saved key to ResponseWriter
 		_, err = fmt.Fprint(res, string(key))
@@ -103,7 +103,7 @@ func SendFiles(dir string) {
 		log.Info().Msg("GET Stop")
 		log.Info().Msg("Stop signal received")
 		// Shutdown server and send to empty context
-		err := srv.Shutdown(context.TODO())
+		err := srv.Shutdown(context.Background())
 		if err != nil { log.Fatal().Err(err).Msg("Error stopping server") }
 	})
 
@@ -112,7 +112,7 @@ func SendFiles(dir string) {
 }
 
 // Get files from sender
-func RecvFiles(dir string, senderAddr string) {
+func RecvFiles(senderAddr string) {
 	// Use ConsoleWriter logger
 	log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr}).Hook(FatalHook{})
 	// Get server address by getting the IP without the port, prepending http:// and appending :9898

main.go

@@ -104,9 +104,7 @@ func main() {
 			choiceStr, _ := reader.ReadString('\n')
 			// Convert input to int after trimming spaces
 			choiceInt, err := strconv.Atoi(strings.TrimSpace(choiceStr))
-			if err != nil {
-				log.Fatal().Err(err).Msg("Error converting choice to int")
-			}
+			if err != nil { log.Fatal().Err(err).Msg("Error converting choice to int") }
 			// Set choiceIndex to choiceInt-1 to allow for indexing
 			choiceIndex := choiceInt - 1
 			// Get IP of chosen receiver
@@ -120,8 +118,8 @@ func main() {
 		log.Info().Msg("Receiver key received")
 		// Encrypt shared key using RSA public key
 		key := EncryptKey(sharedKey, rawKey)
-		// Save encrypted key in opensend directory as savedKey.aesKey
-		SaveEncryptedKey(key, opensendDir + "/savedKey.aesKey")
+		// Save encrypted key in opensend directory as key.aes
+		SaveEncryptedKey(key, opensendDir + "/key.aes")
 		// Instantiate Config object
 		config := NewConfig(*actionType, *actionData)
 		// Collect any files that may be required for transaction into opensend directory
@@ -145,10 +143,12 @@ func main() {
 			// Shutdown zeroconf server at the end of main()
 			defer zeroconfShutdown()
 		}
-		// Notify user opensend is waiting for key exchange
-		log.Info().Msg("Waiting for sender key exchange")
+		// Notify user keypair is being generated
+		log.Info().Msg("Generating RSA keypair")
 		// Generate keypair
 		privateKey, publicKey := GenerateRSAKeypair()
+		// Notify user opensend is waiting for key exchange
+		log.Info().Msg("Waiting for sender key exchange")
 		// Exchange keys with sender
 		senderIP := ReceiverKeyExchange(publicKey)
 		// Sleep 300ms to allow sender time to start HTTP server
@@ -156,7 +156,7 @@ func main() {
 		// Notify user files are being received
 		log.Info().Msg("Receiving files from server (This may take a while)")
 		// Get files from sender and place them into the opensend directory
-		RecvFiles(opensendDir, senderIP)
+		RecvFiles(senderIP)
 		// Get encrypted shared key from sender
 		encryptedKey := GetKey(senderIP)
 		// Send stop signal to sender's HTTP server
@@ -180,5 +180,5 @@ func main() {
 	}
 	// Remove opensend directory
 	err = os.RemoveAll(opensendDir)
-	if err != nil { log.Fatal().Err(err).Msg("Error remove opensend dir") }
+	if err != nil { log.Fatal().Err(err).Msg("Error removing opensend directory") }
 }