FM / rsa

/usr/lib/python2.6/site-packages/rsa

Name	Size	Mode	Actions
asn1.py	1781	0644	edit dl rm
asn1.pyc	1653	0644	edit dl rm
asn1.pyo	1653	0644	edit dl rm
bigfile.py	5185	0644	edit dl rm
bigfile.pyc	4786	0644	edit dl rm
bigfile.pyo	4786	0644	edit dl rm
cli.py	12185	0644	edit dl rm
cli.pyc	13319	0644	edit dl rm
cli.pyo	13319	0644	edit dl rm
common.py	4640	0644	edit dl rm
common.pyc	4235	0644	edit dl rm
common.pyo	4235	0644	edit dl rm
core.py	1656	0644	edit dl rm
core.pyc	1485	0644	edit dl rm
core.pyo	1485	0644	edit dl rm
key.py	22867	0644	edit dl rm
key.pyc	23986	0644	edit dl rm
key.pyo	23986	0644	edit dl rm
parallel.py	2299	0644	edit dl rm
parallel.pyc	2098	0644	edit dl rm
parallel.pyo	2098	0644	edit dl rm
pem.py	3537	0644	edit dl rm
pem.pyc	2843	0644	edit dl rm
pem.pyo	2843	0644	edit dl rm
pkcs1.py	12230	0644	edit dl rm
pkcs1.pyc	11173	0644	edit dl rm
pkcs1.pyo	11126	0644	edit dl rm
prime.py	4560	0644	edit dl rm
prime.pyc	3664	0644	edit dl rm
prime.pyo	3618	0644	edit dl rm
randnum.py	2643	0644	edit dl rm
randnum.pyc	2074	0644	edit dl rm
randnum.pyo	2074	0644	edit dl rm
transform.py	6892	0644	edit dl rm
transform.pyc	5856	0644	edit dl rm
transform.pyo	5856	0644	edit dl rm
util.py	3059	0644	edit dl rm
util.pyc	2520	0644	edit dl rm
util.pyo	2449	0644	edit dl rm
varblock.py	5406	0644	edit dl rm
varblock.pyc	4856	0644	edit dl rm
varblock.pyo	4856	0644	edit dl rm
_compat.py	3890	0644	edit dl rm
_compat.pyc	3655	0644	edit dl rm
_compat.pyo	3655	0644	edit dl rm
_version133.py	11764	0644	edit dl rm
_version133.pyc	13639	0644	edit dl rm
_version133.pyo	13639	0644	edit dl rm
_version200.py	15123	0644	edit dl rm
_version200.pyc	15264	0644	edit dl rm
_version200.pyo	15264	0644	edit dl rm
__init__.py	1476	0644	edit dl rm
__init__.pyc	1112	0644	edit dl rm
__init__.pyo	1112	0644	edit dl rm

Edit: /usr/lib/python2.6/site-packages/rsa/transform.py (6892B)

# -*- coding: utf-8 -*-
#
#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

"""Data transformation functions.

From bytes to a number, number to bytes, etc.
"""

from __future__ import absolute_import

try:
    # We'll use psyco if available on 32-bit architectures to speed up code.
    # Using psyco (if available) cuts down the execution time on Python 2.5
    # at least by half.
    import psyco

psyco.full()
except ImportError:
    pass

import binascii
from struct import pack
from rsa import common
from rsa._compat import is_integer, b, byte, get_word_alignment, ZERO_BYTE, EMPTY_BYTE

def bytes2int(raw_bytes):
    r"""Converts a list of bytes or an 8-bit string to an integer.

When using unicode strings, encode it to some encoding like UTF8 first.

>>> (((128 * 256) + 64) * 256) + 15
    8405007
    >>> bytes2int(b'\x80@\x0f')
    8405007

"""

return int(binascii.hexlify(raw_bytes), 16)

def _int2bytes(number, block_size=None):
    r"""Converts a number to a string of bytes.

Usage::

>>> _int2bytes(123456789)
        b'\x07[\xcd\x15'
        >>> bytes2int(_int2bytes(123456789))
        123456789

>>> _int2bytes(123456789, 6)
        b'\x00\x00\x07[\xcd\x15'
        >>> bytes2int(_int2bytes(123456789, 128))
        123456789

>>> _int2bytes(123456789, 3)
        Traceback (most recent call last):
        ...
        OverflowError: Needed 4 bytes for number, but block size is 3

@param number: the number to convert
    @param block_size: the number of bytes to output. If the number encoded to
        bytes is less than this, the block will be zero-padded. When not given,
        the returned block is not padded.

@throws OverflowError when block_size is given and the number takes up more
        bytes than fit into the block.
    """

# Type checking
    if not is_integer(number):
        raise TypeError("You must pass an integer for 'number', not %s" %
                        number.__class__)

if number < 0:
        raise ValueError('Negative numbers cannot be used: %i' % number)

# Do some bounds checking
    if number == 0:
        needed_bytes = 1
        raw_bytes = [ZERO_BYTE]
    else:
        needed_bytes = common.byte_size(number)
        raw_bytes = []

# You cannot compare None > 0 in Python 3x. It will fail with a TypeError.
    if block_size and block_size > 0:
        if needed_bytes > block_size:
            raise OverflowError('Needed %i bytes for number, but block size '
                                'is %i' % (needed_bytes, block_size))

# Convert the number to bytes.
    while number > 0:
        raw_bytes.insert(0, byte(number & 0xFF))
        number >>= 8

# Pad with zeroes to fill the block
    if block_size and block_size > 0:
        padding = (block_size - needed_bytes) * ZERO_BYTE
    else:
        padding = EMPTY_BYTE

return padding + EMPTY_BYTE.join(raw_bytes)

def bytes_leading(raw_bytes, needle=ZERO_BYTE):
    """
    Finds the number of prefixed byte occurrences in the haystack.

Useful when you want to deal with padding.

:param raw_bytes:
        Raw bytes.
    :param needle:
        The byte to count. Default \000.
    :returns:
        The number of leading needle bytes.
    """

leading = 0
    # Indexing keeps compatibility between Python 2.x and Python 3.x
    _byte = needle[0]
    for x in raw_bytes:
        if x == _byte:
            leading += 1
        else:
            break
    return leading

def int2bytes(number, fill_size=None, chunk_size=None, overflow=False):
    """
    Convert an unsigned integer to bytes (base-256 representation)::

Does not preserve leading zeros if you don't specify a chunk size or
    fill size.

.. NOTE:
        You must not specify both fill_size and chunk_size. Only one
        of them is allowed.

:param number:
        Integer value
    :param fill_size:
        If the optional fill size is given the length of the resulting
        byte string is expected to be the fill size and will be padded
        with prefix zero bytes to satisfy that length.
    :param chunk_size:
        If optional chunk size is given and greater than zero, pad the front of
        the byte string with binary zeros so that the length is a multiple of
        ``chunk_size``.
    :param overflow:
        ``False`` (default). If this is ``True``, no ``OverflowError``
        will be raised when the fill_size is shorter than the length
        of the generated byte sequence. Instead the byte sequence will
        be returned as is.
    :returns:
        Raw bytes (base-256 representation).
    :raises:
        ``OverflowError`` when fill_size is given and the number takes up more
        bytes than fit into the block. This requires the ``overflow``
        argument to this function to be set to ``False`` otherwise, no
        error will be raised.
    """

if number < 0:
        raise ValueError("Number must be an unsigned integer: %d" % number)

if fill_size and chunk_size:
        raise ValueError("You can either fill or pad chunks, but not both")

# Ensure these are integers.
    number & 1

raw_bytes = b('')

# Pack the integer one machine word at a time into bytes.
    num = number
    word_bits, _, max_uint, pack_type = get_word_alignment(num)
    pack_format = ">%s" % pack_type
    while num > 0:
        raw_bytes = pack(pack_format, num & max_uint) + raw_bytes
        num >>= word_bits
    # Obtain the index of the first non-zero byte.
    zero_leading = bytes_leading(raw_bytes)
    if number == 0:
        raw_bytes = ZERO_BYTE
    # De-padding.
    raw_bytes = raw_bytes[zero_leading:]

length = len(raw_bytes)
    if fill_size and fill_size > 0:
        if not overflow and length > fill_size:
            raise OverflowError(
                    "Need %d bytes for number, but fill size is %d" %
                    (length, fill_size)
            )
        raw_bytes = raw_bytes.rjust(fill_size, ZERO_BYTE)
    elif chunk_size and chunk_size > 0:
        remainder = length % chunk_size
        if remainder:
            padding_size = chunk_size - remainder
            raw_bytes = raw_bytes.rjust(length + padding_size, ZERO_BYTE)
    return raw_bytes

if __name__ == '__main__':
    import doctest

doctest.testmod()

cmd: