mix.py

   1 #!/bin/env python
   2 # Created:20080610
   3 # By Jeff Connelly
   4 #
   5 # Mix random data, compressing low-entropy into high-entropy
   6
   7 import hashlib
   8 import sys
   9 import math
  10
  11 hash = hashlib.sha512
  12
  13 # in / out
  14 ratio = 2
  15
  16 if len(sys.argv) > 1:
  17     ratio = float(sys.argv[1])
  18
  19 hash_size = len(hash("").digest())
  20 bytes_to_read = int(math.floor(hash_size * ratio))
  21
  22 while True:
  23     input = sys.stdin.read(bytes_to_read)
  24     if len(input) == 0:
  25         break
  26     output = hash(input).digest()
  27     sys.stdout.write(output)
  28     if len(input) < bytes_to_read:
  29         break
  30