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# Copyright 2010 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import struct
import Crypto.Cipher.ARC4
class DataGenerator(object):
'''Generate random binary data.'''
_data = 'x' * 1024**2
def __init__(self, seed):
key = struct.pack('!Q', seed)
self._arc4 = Crypto.Cipher.ARC4.new(key)
self._buffer = ''
def generate(self, size):
while len(self._buffer) < size:
self._buffer += self._generate_junk()
return self._split_off_data(size)
def _generate_junk(self):
return self._arc4.encrypt(self._data)
def _split_off_data(self, size):
data = self._buffer[:size]
self._buffer = self._buffer[size:]
return data
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