/usr/lib/python2.7/dist-packages/foolscap/base32.py is in python-foolscap 0.6.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | # copied from the waterken.org Web-Calculus python implementation
def encode(bytes):
chars = ""
buffer = 0;
n = 0;
for b in bytes:
buffer = buffer << 8
buffer = buffer | ord(b)
n = n + 8
while n >= 5:
chars = chars + _encode((buffer >> (n - 5)) & 0x1F)
n = n - 5;
buffer = buffer & 0x1F # To quiet any warning from << operator
if n > 0:
buffer = buffer << (5 - n)
chars = chars + _encode(buffer & 0x1F)
return chars
def _encode(v):
if v < 26:
return chr(ord('a') + v)
else:
return chr(ord('2') + (v - 26))
# we use the rfc4648 base32 alphabet, in lowercase
BASE32_ALPHABET = "".join([_encode(i) for i in range(0x20)])
# 'abcdefghijklmnopqrstuvwxyz234567'
def is_base32(s):
for c in s.lower():
if c not in BASE32_ALPHABET:
return False
return True
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