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passlib.utils.binary - binary data encoding/decoding/manipulation
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return a 256-byte string for translating bytes using specified mapping.
bytes not specified by mapping will be left alone.
:param mapping:
dict mapping input byte (str or int) -> output byte (str or int).
:param source:
optional existing byte translation string to use as base.
(must be 255-length byte string). defaults to identity mapping.
:returns:
255-length byte string for passing to bytes().translate.
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encode using shortened base64 format which omits padding & whitespace.
uses default ``+/`` altchars.
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decode from shortened base64 format which omits padding & whitespace.
uses default ``+/`` altchars.
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encode using shortened base64 format which omits padding & whitespace.
uses custom ``./`` altchars.
it is primarily used by Passlib's custom pbkdf2 hashes.
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decode from shortened base64 format which omits padding & whitespace.
uses custom ``./`` altchars, but supports decoding normal ``+/`` altchars as well.
it is primarily used by Passlib's custom pbkdf2 hashes.
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wrapper around :func:`base64.b32encode` which strips padding,
and returns a native string.
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wrapper around :func:`base64.b32decode`
which handles common mistyped chars.
padding optional, ignored if present.
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„ Z d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z! d „ Z" d „ Z# d „ Z$ d „ Z% d „ Z& d „ Z' RS( sc Provides routines for encoding/decoding base64 data using
arbitrary character mappings, selectable endianness, etc.
:arg charmap:
A string of 64 unique characters,
which will be used to encode successive 6-bit chunks of data.
A character's position within the string should correspond
to its 6-bit value.
:param big:
Whether the encoding should be big-endian (default False).
.. note::
This class does not currently handle base64's padding characters
in any way what so ever.
Raw Bytes <-> Encoded Bytes
===========================
The following methods convert between raw bytes,
and strings encoded using the engine's specific base64 variant:
.. automethod:: encode_bytes
.. automethod:: decode_bytes
.. automethod:: encode_transposed_bytes
.. automethod:: decode_transposed_bytes
..
.. automethod:: check_repair_unused
.. automethod:: repair_unused
Integers <-> Encoded Bytes
==========================
The following methods allow encoding and decoding
unsigned integers to and from the engine's specific base64 variant.
Endianess is determined by the engine's ``big`` constructor keyword.
.. automethod:: encode_int6
.. automethod:: decode_int6
.. automethod:: encode_int12
.. automethod:: decode_int12
.. automethod:: encode_int24
.. automethod:: decode_int24
.. automethod:: encode_int64
.. automethod:: decode_int64
Informational Attributes
========================
.. attribute:: charmap
unicode string containing list of characters used in encoding;
position in string matches 6bit value of character.
.. attribute:: bytemap
bytes version of :attr:`charmap`
.. attribute:: big
boolean flag indicating this using big-endian encoding.
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t | j | ƒ ƒ } | S( s‹ encode bytes to base64 string.
:arg source: byte string to encode.
:returns: byte string containing encoded data.
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d f ƒ ‚ n Xd S( s decode bytes from base64 string.
:arg source: byte string to decode.
:returns: byte string containing decoded data.
s source must be bytes, not %si i s( input string length cannot be == 1 mod 4s invalid character: %ri N( R6 R_ RI Rt Ru RE RD R R Rg R Rl t KeyErrort args( Ro R< Rw Rx Ry RK ( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt decode_bytesâ s c c` sÛ d } xu | | k r} | ƒ } | ƒ } | ƒ } | ƒ } | | d @d >BV| d ?| d @d >BV| d ?| d >BV| d 7} q W| r× | ƒ } | ƒ } | | d @d >BV| d k r× | ƒ } | d ?| d @d >BVq× n d S( s> helper used by decode_bytes() to handle little-endian encodingi i i i i i i N( ( Ro Ry Rw Rx R] R} R~ R t v4( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyRn ø s" c c` sÛ d } xu | | k r} | ƒ } | ƒ } | ƒ } | ƒ } | d >| d ?BV| d @d >| d ?BV| d @d >| BV| d 7} q W| r× | ƒ } | ƒ } | d >| d ?BV| d k r× | ƒ } | d @d >| d ?BVq× n d S( s; helper used by decode_bytes() to handle big-endian encodingi i i i i i i N( ( Ro Ry Rw Rx R] R} R~ R Rƒ ( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyRk s" c ` sU t ‡ f d † t | j ƒ Dƒ ƒ } | j ‡ f d † t | j ƒ Dƒ ƒ t | ƒ S( s2 helper to generate set of valid last chars & bytesc 3` s% | ] \ } } | ˆ @s | Vq d S( N( ( R\ t it c( t bits( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pys <genexpr>G s c 3` s% | ] \ } } | ˆ @s | Vq d S( N( ( R\ R„ R… ( R† ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pys <genexpr>H s ( Ra Rf Rb t updateR[ t frozenset( Ro R† t pset( ( R† s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt
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| d | f S( s helper to detect & clear invalid unused bits in last character.
:arg source:
encoded data (as ascii bytes or unicode).
:returns:
`(True, result)` if the string was repaired,
`(False, source)` if the string was ok as-is.
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repair_unused‚ s c ` sT t ˆ t ƒ s+ t d t ˆ ƒ f ƒ ‚ n t ‡ f d † | Dƒ ƒ } | j | ƒ S( s> encode byte string, first transposing source using offset lists source must be bytes, not %sc 3` s | ] } ˆ | Vq d S( N( ( R\ RJ ( R< ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pys <genexpr>˜ s ( R6 R_ RI Rt R R| ( Ro R< t offsetst tmp( ( R< s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt encode_transposed_bytes” s c C` sV | j | ƒ } d g t | ƒ } x' t | | ƒ D] \ } } | | | <q2 Wt | ƒ S( sG decode byte string, then reverse transposition described by offset listN( R‚ R2 RE t zipR ( Ro R< R– R— t bufRJ t char( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt decode_transposed_bytes› s
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rå t d | f ƒ ‚ n X| r| rÿ | | L} q| d | >d M} n | S( s« decode base64 string -> integer
:arg source: base64 string to decode.
:arg bits: number of bits in resulting integer.
:raises ValueError:
* if the string contains invalid base64 characters.
* if the string is not long enough - it must be at least
``int(ceil(bits/6))`` in length.
:returns:
a integer in the range ``0 <= n < 2**bits``
s source must be bytes, not %si s source must be %d charsi s invalid character in string: %ri (
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c C` s | j | d ƒ S( s& decode 5 char string -> 30 bit integeri ( R ( Ro R< ( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt decode_int30ÿ s c C` s | j | d ƒ S( s± decode 11 char base64 string -> 64-bit integer
this format is used primarily by des-crypt & variants to encode
the DES output value used as a checksum.
i@ ( R ( Ro R< ( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt decode_int64 s c ` sy | d } | | 7} | j rA t | d d d ƒ } ˆ | K‰ n t d | d ƒ } t t | j ‡ f d † | Dƒ ƒ ƒ S( sÕ encode integer into base64 format
:arg value: non-negative integer to encode
:arg bits: number of bits to encode
:returns:
a string of length ``int(ceil(bits/6.0))``.
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c C` sm | d k s | d k r' t d ƒ ‚ n | d @| d ?d @g } | j rW t | ƒ } n t t | j | ƒ ƒ S( s' encodes 12-bit integer -> 2 char stringi iÿ s value out of rangei? i ( RD Rh R R R Rd ( Ro R^ t raw( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt encode_int121 s c C` sƒ | d k s | d k r' t d ƒ ‚ n | d @| d ?d @| d ?d @| d ?d @g } | j rm t | ƒ } n t t | j | ƒ ƒ S( s' encodes 24-bit integer -> 4 char stringi iÿÿÿ s value out of rangei? i i i ( RD Rh R R R Rd ( Ro R^ R© ( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt encode_int24: s c C` s7 | d k s | d k r' t d ƒ ‚ n | j | d ƒ S( s& decode 5 char string -> 30 bit integeri iÿÿÿ?s value out of rangei ( RD R§ ( Ro R^ ( ( s8 /usr/lib/python2.7/site-packages/passlib/utils/binary.pyt encode_int30D s c C` s7 | d k s | d k r' t d ƒ ‚ n | j | d ƒ S( s± encode 64-bit integer -> 11 char hash64 string
this format is used primarily by des-crypt & variants to encode
the DES output value used as a checksum.
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