18 lines
523 B
Python
18 lines
523 B
Python
# (c) Copyright 2018 by Coinkite Inc. This file is part of Coldcard <coldcardwallet.com>
|
|
# and is covered by GPLv3 license found in COPYING.
|
|
#
|
|
# random.py - subset of random module, with no compat, and using crypto-quality rng
|
|
#
|
|
from ckcc import rng
|
|
|
|
# In-place list shuffle using Fisher-Yates algo
|
|
#
|
|
# see <https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#Implementation_errors>
|
|
#
|
|
def shuffle(seq):
|
|
for i in range(len(seq)-1, 0, -1):
|
|
j = rng() % (i+1)
|
|
seq[i], seq[j] = seq[j], seq[i]
|
|
|
|
# EOF
|