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d� Zdd� Ze�d�Zdd� Zdd� Zdd� Zdd� Zeddd�Z d d� Z d d � Z d#d d�Z d$d!d"�Z dS )%a� passlib.crypto.des -- DES block encryption routines
History
=======
These routines (which have since been drastically modified for python)
are based on a Java implementation of the des-crypt algorithm,
found at `<http://www.dynamic.net.au/christos/crypt/UnixCrypt2.txt>`_.
The copyright & license for that source is as follows::
UnixCrypt.java 0.9 96/11/25
Copyright (c) 1996 Aki Yoshida. All rights reserved.
Permission to use, copy, modify and distribute this software
for non-commercial or commercial purposes and without fee is
hereby granted provided that this copyright notice appears in
all copies.
---
Unix crypt(3C) utility
@version 0.9, 11/25/96
@author Aki Yoshida
---
modified April 2001
by Iris Van den Broeke, Daniel Deville
---
Unix Crypt.
Implements the one way cryptography used by Unix systems for
simple password protection.
@version $Id: UnixCrypt2.txt,v 1.1.1.1 2005/09/13 22:20:13 christos Exp $
@author Greg Wilkins (gregw)
The netbsd des-crypt implementation has some nice notes on how this all works -
http://fxr.googlebit.com/source/lib/libcrypt/crypt.c?v=NETBSD-CURRENT
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:arg key:
DES key as 7 byte string, or 8 byte string with parity bits
(parity bit values are ignored).
:arg input:
plaintext block to encrypt, as 8 byte string.
:arg salt:
Optional 24-bit integer used to mutate the base DES algorithm in a
manner specific to :class:`~passlib.hash.des_crypt` and its variants.
The default value ``0`` provides the normal (unsalted) DES behavior.
The salt functions as follows:
if the ``i``'th bit of ``salt`` is set,
bits ``i`` and ``i+24`` are swapped in the DES E-box output.
:arg rounds:
Optional number of rounds of to apply the DES key schedule.
the default (``rounds=1``) provides the normal DES behavior,
but :class:`~passlib.hash.des_crypt` and its variants use
alternate rounds values.
:raises TypeError: if any of the provided args are of the wrong type.
:raises ValueError:
if any of the input blocks are the wrong size,
or the salt/rounds values are out of range.
:returns:
resulting 8-byte ciphertext block.
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�S )&a� encrypt single block of data using DES, operates on 64-bit integers.
this function is essentially the same as :func:`des_encrypt_block`,
except that it operates on integers, and will NOT automatically
expand 56-bit keys if provided (since there's no way to detect them).
:arg key:
DES key as 64-bit integer (the parity bits are ignored).
:arg input:
input block as 64-bit integer
:arg salt:
optional 24-bit integer used to mutate the base DES algorithm.
defaults to ``0`` (no mutation applied).
:arg rounds:
optional number of rounds of to apply the DES key schedule.
defaults to ``1``.
:raises TypeError: if any of the provided args are of the wrong type.
:raises ValueError:
if any of the input blocks are the wrong size,
or the salt/rounds values are out of range.
:returns:
resulting ciphertext as 64-bit integer.
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