#!/usr/bin/env python3
import base64, codecs, re

exemple=b'pbkdf2:sha256:600000$YnRgjnim$c9541a8c6ad40bc064979bc446025041ffac9af2f762726971d8a28272c550ed'

m = re.match(br'pbkdf2:sha256:(\d*)\$([^\$]*)\$(.*)',exemple)
iterations =  m.group(1)
salt = m.group(2)
hashe = m.group(3)
print(f"sha256:{iterations.decode()}:{base64.b64encode(salt).decode()}:{base64.b64encode(codecs.decode(hashe,'hex')).decode()}")