Secret key is optional now for encryption

Will be autogenerated, if not specified.

main.go

@@ -38,8 +38,8 @@ var generateOptionsParser = flags.NewParser(&generateOptions, flags.None)
 
 var encryptOptions struct {
 	FileName          string `short:"f"  long:"file" description:"File to encrypt" value-name:"FILE" required:"true"`
-	SecretKeyFileName string `short:"s" long:"seckey" description:"Secret key to use" value-name:"FILE" required:"true"`
 	PublicKeyFileName string `short:"p" long:"pubkey" description:"Public key to use" value-name:"FILE" required:"true"`
+	SecretKeyFileName string `short:"s" long:"seckey" description:"Secret key to use" value-name:"FILE"`
 }
 var encryptOptionsParser = flags.NewParser(&encryptOptions, flags.None)
 
@@ -90,7 +90,13 @@ func main() {
 		if err != nil {
 			log.Fatal(aurora.Red(err))
 		}
-		privateKey, err := readPrivateKey(encryptOptions.SecretKeyFileName)
+		var privateKey [32]byte
+		if encryptOptions.SecretKeyFileName == "" {
+			promptYesNo("Secret key not specified and will be autogenerated. Do you want to continue?")
+			_, privateKey, err = keys.GenerateKeyPair()
+		} else {
+			privateKey, err = readPrivateKey(encryptOptions.SecretKeyFileName)
+		}
 		if err != nil {
 			log.Fatal(aurora.Red(err))
 		}