toxygen/toxygen/toxencryptsave.py
2017-02-11 22:04:32 +03:00

75 lines
3.8 KiB
Python

import libtox
from ctypes import c_size_t, create_string_buffer, byref, c_int, ArgumentError, c_char_p, c_bool
from toxencryptsave_enums_and_consts import *
class ToxEncryptSave:
def __init__(self):
self.libtoxencryptsave = libtox.LibToxEncryptSave()
def is_data_encrypted(self, data):
"""
Checks if given data is encrypted
"""
func = self.libtoxencryptsave.tox_is_data_encrypted
func.restype = c_bool
result = func(c_char_p(bytes(data)))
return result
def pass_encrypt(self, data, password):
"""
Encrypts the given data with the given password.
:return: output array
"""
out = create_string_buffer(len(data) + TOX_PASS_ENCRYPTION_EXTRA_LENGTH)
tox_err_encryption = c_int()
self.libtoxencryptsave.tox_pass_encrypt(c_char_p(data),
c_size_t(len(data)),
c_char_p(bytes(password, 'utf-8')),
c_size_t(len(password)),
out,
byref(tox_err_encryption))
tox_err_encryption = tox_err_encryption.value
if tox_err_encryption == TOX_ERR_ENCRYPTION['OK']:
return out[:]
elif tox_err_encryption == TOX_ERR_ENCRYPTION['NULL']:
raise ArgumentError('Some input data, or maybe the output pointer, was null.')
elif tox_err_encryption == TOX_ERR_ENCRYPTION['KEY_DERIVATION_FAILED']:
raise RuntimeError('The crypto lib was unable to derive a key from the given passphrase, which is usually a'
' lack of memory issue. The functions accepting keys do not produce this error.')
elif tox_err_encryption == TOX_ERR_ENCRYPTION['FAILED']:
raise RuntimeError('The encryption itself failed.')
def pass_decrypt(self, data, password):
"""
Decrypts the given data with the given password.
:return: output array
"""
out = create_string_buffer(len(data) - TOX_PASS_ENCRYPTION_EXTRA_LENGTH)
tox_err_decryption = c_int()
self.libtoxencryptsave.tox_pass_decrypt(c_char_p(bytes(data)),
c_size_t(len(data)),
c_char_p(bytes(password, 'utf-8')),
c_size_t(len(password)),
out,
byref(tox_err_decryption))
tox_err_decryption = tox_err_decryption.value
if tox_err_decryption == TOX_ERR_DECRYPTION['OK']:
return out[:]
elif tox_err_decryption == TOX_ERR_DECRYPTION['NULL']:
raise ArgumentError('Some input data, or maybe the output pointer, was null.')
elif tox_err_decryption == TOX_ERR_DECRYPTION['INVALID_LENGTH']:
raise ArgumentError('The input data was shorter than TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes')
elif tox_err_decryption == TOX_ERR_DECRYPTION['BAD_FORMAT']:
raise ArgumentError('The input data is missing the magic number (i.e. wasn\'t created by this module, or is'
' corrupted)')
elif tox_err_decryption == TOX_ERR_DECRYPTION['KEY_DERIVATION_FAILED']:
raise RuntimeError('The crypto lib was unable to derive a key from the given passphrase, which is usually a'
' lack of memory issue. The functions accepting keys do not produce this error.')
elif tox_err_decryption == TOX_ERR_DECRYPTION['FAILED']:
raise RuntimeError('The encrypted byte array could not be decrypted. Either the data was corrupt or the '
'password/key was incorrect.')