refactor: add phc saltEncoding option

Author: zdm

lib/phc.js

@@ -101,7 +101,7 @@ export function toPhc ( { id, version, params, salt, hash, defaultParams, sortPa
     return string;
 }
 
-export function fromPhc ( string, { defaultParams, decodeNumbers = true, decodeSalt = true, decodeHash = true } = {} ) {
+export function fromPhc ( string, { defaultParams, decodeNumbers = true, saltEncoding = "base64" } = {} ) {
     const match = string.match( PHC_RE );
     if ( !match ) throw "PHC string is not valid";
 
@@ -110,14 +110,10 @@ export function fromPhc ( string, { defaultParams, decodeNumbers = true, decodeS
         "version": undefined,
         "params": undefined,
         "salt": match.groups.salt
-            ? ( decodeSalt
-                ? Buffer.from( match.groups.salt, "base64" )
-                : match.groups.salt )
+            ? Buffer.from( match.groups.salt, saltEncoding )
             : undefined,
         "hash": match.groups.hash
-            ? ( decodeHash
-                ? Buffer.from( match.groups.hash, "base64" )
-                : match.groups.hash )
+            ? Buffer.from( match.groups.hash, "base64" )
             : undefined,
     };