# Copyright (c) 2002-2012 IronPort Systems and Cisco Systems
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

#
# ssh.cipher.blowfish_cbc
#
# Implements the Blowfish cipher in CBC mode.
#

from coro.ssh.cipher import SSH_Cipher_Method
from Crypto.Cipher import Blowfish

class Blowfish_CBC(SSH_Cipher_Method):

    name = 'blowfish-cbc'
    block_size = 8
    key_size = 16
    iv_size = 8
    cipher = None

    def encrypt(self, data):
        return self.cipher.encrypt(data)

    def descrypt(self, data):
        return self.cipher.decrypt(data)

    def set_encryption_key_and_iv(self, key, IV):
        self.key = key
        self.IV = IV
        self.cipher = Blowfish.new(key, Blowfish.MODE_CBC, IV)