util.py

   1 from hashlib import sha256
   2
   3 def dblsha(b):
   4         return sha256(sha256(b).digest()).digest()
   5
   6 def swap32(b):
   7         o = b''
   8         for i in range(0, len(b), 4):
   9                 o += b[i + 3:i - 1 if i else None:-1]
  10         return o
  11
  12 class RejectedShare(ValueError):
  13         pass