import hashlib
import base64

def file_hash(filename):
  h = hashlib.sha1()
  with open(filename, 'rb', buffering=0) as f:
    for b in iter(lambda : f.read(128*1024), b''):
      h.update(b)
  return h.digest()

if __name__=='__main__':
    digest = file_hash("filename")
    print base64.b32encode(digest).lower()