Implement strength for whole library

index.ts

@@ -5,6 +5,19 @@ import PrivateWrap from './src/private-wrap'
 import PwdBox from './src/pwd-box'
 import PwdWrap from './src/pwd-wrap'
 
+export enum Strength {
+  weak,
+  moderate,
+  strong
+}
+
+export const set_strength = (new_strength: Strength) => {
+  if (!(new_strength in Strength)) throw 'Invalid strength !'
+  strength = new_strength
+}
+let strength = Strength.moderate
+export let STRENGTH: () => Strength = () => strength
+
 export * as kdf from './src/kdf'
 export * as misc from './src/misc'
 export * as signature from './src/signature'