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Description:

pyZZUF 0.1

Python implementation of bit-flip zzuf mutator.
No more os.system, subprocess.check_output and
subprocess.Popen

Basic usage

Inline
from pyZZUF import *

print pyZZUF('good').mutate()

Options
from pyZZUF import *

zzuf = pyZZUF('good')

# Random seed (default 0)
zzuf.set_seed(9)
# Bit fuzzing ratio (default 0.004)
zzuf.set_ratio(0.91)

# Offsets and ranges
zzuf.set_offset(6)
# Only fuzz bytes at offsets within <ranges>
zzuf.set_fuzz_bytes([[0, 3], [6, EOF]])

# Protect bytes and characters in <list>
zzuf.set_protected([0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39])
# Append more bytes
zzuf.set_protected("0123456789", True)

# Refuse bytes and characters in <list>
zzuf.set_refused("abcd")
# Append more bytes
zzuf.set_refused([0x00, 0xFF], True)

# Permit bytes and characters in <list>
zzuf.set_permitted('bad')
# Append more bytes
zzuf.set_permitted('!', True)

# Fuzzing mode <mode> ([xor] set unset)
zzuf.set_fuzz_mode(FUZZ_MODE_XOR)

print zzuf.mutate()

Mutagen
zzuf = pyZZUF('good')

for data in zzuf.mutagen(start=0.0, stop=1, step=0.1):
if __debug__:
seed, ratio, index = data.get_state()
print data.tostring().encode('hex'), seed, ratio, index
if data == 'bad!':
break

Inheritance of the previous state (meat)
zzuf = pyZZUF('good')

for data in zzuf.mutagen(start=0.0, stop=1, step=0.1, inheritance=True):
if __debug__:
seed, ratio, index = data.get_state()
print data.tostring().encode('hex'), seed, ratio, index
if data == 'bad!':
break

Stream-generator with restoring state of mutator
obj = pyZZUF('good')
gen = obj.mutagen(start=0.0, stop=1, step=0.01)

while True:
try:
data = gen.next()
seed, ratio, index = data.get_state()

if __debug__:
print data.tostring().encode('hex'), seed, ratio, index

if seed == 20:
# Set next state of generator (<seed>, <ratio>).
# In this example, it makes an infinite loop!
gen.send((0, 0.0))

if data == 'bad!':
break
except StopIteration:
break

Check of identity
$ echo -n "The quick brown fox jumps over the lazy dog" | zzuf -r0.04 | hd

00000000 54 68 65 20 71 75 69 63 6b 20 62 72 6f 57 6c 20 |The quick broWl |
00000010 66 4f 58 20 6a 75 6f 70 73 24 6f 76 75 72 20 74 |fOX juops$ovur t|
00000020 68 65 21 6c 61 7a 78 20 66 6f 67 |he!lazx fog|
0000002b

$ python -c "import pyZZUF, sys; sys.stdout.write(pyZZUF.pyZZUF('The quick brown fox jumps over the lazy dog', ratio=0.04).mutate().tostring())" | hd

00000000 54 68 65 20 71 75 69 63 6b 20 62 72 6f 57 6c 20 |The quick broWl |
00000010 66 4f 58 20 6a 75 6f 70 73 24 6f 76 75 72 20 74 |fOX juops$ovur t|
00000020 68 65 21 6c 61 7a 78 20 66 6f 67 |he!lazx fog|
0000002b

Installation

pip install pyZZUF

Notes*
Use PyPy for speedup