Add salt size flag to pw.

README.md

@@ -310,7 +310,21 @@ Individual backends have their options described in the sections below.
 
 ### Files
 
-The `files` backend implements the regular password and acl checks as described in mosquitto. Passwords should be in PBKDF2 format (for other backends too), and may be generated using the `pw` utility (built by default when running `make`) included in the plugin (or one of your own). Check pw-gen dir for `pw` flags.
+The `files` backend implements the regular password and acl checks as described in mosquitto. Passwords should be in PBKDF2 format (for other backends too), and may be generated using the `pw` utility (built by default when running `make`) included in the plugin (or one of your own). Passwords may also be tested using the [pw-test package](https://github.com/iegomez/pw-test).
+
+Usage of `pw`:
+
+```
+Usage of ./pw:
+  -a string
+    	algorithm: sha256 or sha512 (default "sha512")
+  -i int
+    	hash iterations (default 100000)
+  -p string
+    	password
+  -s int
+    	salt size (default 16)
+```
 
 For this backend passwords and acls file paths must be given:
 

pw-gen/pw.go

@@ -7,20 +7,18 @@ import (
 	"github.com/iegomez/mosquitto-go-auth/common"
 )
 
-// saltSize defines the salt size
-const saltSize = 16
-
 func main() {
 
-	var algorithm = flag.String("a", "sha512", "algorithm (sha256 or default: sha512)")
-	var HashIterations = flag.Int("i", 100000, "hash iterations (default: 100000)")
+	var algorithm = flag.String("a", "sha512", "algorithm: sha256 or sha512")
+	var HashIterations = flag.Int("i", 100000, "hash iterations")
 	var password = flag.String("p", "", "password")
+	var saltSize = flag.Int("s", 16, "salt size")
 
 	flag.Parse()
 
-	pwHash, err := common.Hash(*password, saltSize, *HashIterations, *algorithm)
+	pwHash, err := common.Hash(*password, *saltSize, *HashIterations, *algorithm)
 	if err != nil {
-		fmt.Errorf("error: %s\n", err)
+		fmt.Printf("error: %s\n", err)
 	} else {
 		fmt.Println(pwHash)
 	}