emulbreh / pyffx Goto Github PK

I'm still not sure exactly how the library works, but if it uses hashlib.sha1, is there an very small chance of a collision, or a zero chance?

It is ok if my encrypted result has "]" and "n" separately. But that creates problems during rendering in java and python - new lines and other ...

Can I prevent the encrypted results to produce the following sequence of chars?
"\n" and "\r"

Thanks,
Radu

Just installed pyffx and noticed that pycrypto was installed as well.

pycrypto is a defunct project and has been continued by pycryptodome. This project should be updated to use pycryptodome instead (should be a drop replacement)

This:

import pyffx

print "Integer:"
e = pyffx.Integer(b'encrypt')
val = 12345678
print val
enc = e.encrypt(val)
print enc
dec = e.decrypt(enc)
print dec
print

results in:

Integer:
12345678
3853168
7841194

So: What's wrong with this? Even longer keys sometimes work and sometimes fail?!

Not able to encrypt a string with capital letters or Special characters in the string.
Please find the log when I was trying to encrypt a String "Testtesttest12" with a capital letter.

Traceback (most recent call last):
File "leap_data_encryption.py", line 41, in
df['enc_DEVICE_TYPE']=df['DEVICE_TYPE'].apply(encrypt)
File "/opt/usr/local/lib/python3.6/site-packages/pandas/core/series.py", line 3591, in apply
mapped = lib.map_infer(values, f, convert=convert_dtype)
File "pandas/_libs/lib.pyx", line 2217, in pandas._libs.lib.map_infer
File "leap_data_encryption.py", line 30, in encrypt
print(eS.encrypt('Testtesttest12'))
File "/opt/usr/local/lib/python3.6/site-packages/pyffx/codecs.py", line 15, in encrypt
return self.unpack(self.ffx.encrypt(self.radix, self.pack(v)), type(v))
File "/opt/usr/local/lib/python3.6/site-packages/pyffx/codecs.py", line 42, in pack
raise ValueError('non-alphabet character: %s' % e)
ValueError: non-alphabet character: 'T'

In reading the accompanying doc on this: https://medium.com/asecuritysite-when-bob-met-alice/ffx-schemes-for-format-preserving-encryption-a2a7aa4f1377 I noticed that the counter is reset each round. Works fine removing the initialization and allows the value to be carried.

/venvs/jkopay/bin/python3.6 setup.py install
Traceback (most recent call last):
File "setup.py", line 6, in
description = f.read()
File "/usr/lib64/python3.6/encodings/ascii.py", line 26, in decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 305: ordinal not in range(128)

The README.rst contains non-ascii characters which failed the f.read() .

It seems this cache is outdated, it is not consistent with the code on github repo, which has already fix the issue by adding encoding='utf-8' in file opening.

https://files.pythonhosted.org/packages/df/77/b56f0bcdddf471da56c148c05a4dd49af2b4390da44f940cdf684a8cf876/pyffx-0.2.0.tar.gz

The Integer codec does not preserve length if the pre-unpack encoded string contains leading 0's as those get stripped by the conversion to int.

i = pyffx.Integer(b'secret-key', length=5)
assert 4 == len(str(i.encrypt(1234)))

class IntegerIrreversable(pyffx.Integer):
    def unpack(self, v, t):
        return int(super(pyffx.Integer, self).unpack(v, t).lstrip('0').ljust(self.length, '9'))

i2 = IntegerIrreversable(b'secret-key', length=5)
for num in range(1000, 9999):
    assert 5 == len(str(i2.encrypt(num)))

I was testing an implementation of shuffling lists using pyffx, in an attempt to avoid holding the entire shuffled list in memory. One of my implementations is as follows:

def shuffle_generator(sequence):
  key = secrets.token_bytes()
  cipher = pyffx.Sequence(key, alphabet=sequence, length=1)
  for i in sequence:
    yield cipher.encrypt([i])[0]

In tests, this quickly proved to be a terrible shuffle. The result was always a rotation of the input - for example, list(shuffle_generator(range(5))) could produce [2, 3, 4, 0, 1] or [0, 1, 2, 3, 4], but never [0, 4, 2, 3, 1].

Am I using pyffx wrong in some way I'm not realizing?

I'm on pyffx 0.3.0 and Python 3.8.3.

Minor issue, pip install pyffx fails in Windows environment. Cloning from github and running setup.py worked fine.

    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\phi\AppData\Local\Temp\pip-install-wohp0tb6\pyffx\setup.py", line 6, in <module>
        description = f.read()
      File "c:\users\phi\appdata\local\programs\python\python36-32\lib\encodings\cp1252.py", line 23, in decode
        return codecs.charmap_decode(input,self.errors,decoding_table)[0]
    UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 368: character maps to <undefined>

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\phi\AppData\Local\Temp\pip-install-wohp0tb6\pyffx\