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updated pycrypto

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shim_
2018-05-10 16:56:32 +02:00
parent fb89f1946b
commit 26579a25f1
92 changed files with 2518 additions and 5288 deletions
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39
modules/Crypto/Util/Counter.py
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@@ -44,10 +44,9 @@ An example of usage is the following:
>>> from Crypto.Cipher import AES
>>> from Crypto.Util import Counter
>>>
>>> pt = b'X'*1000000
>>> pt = b'\x00'*1000000
>>> ctr = Counter.new(128)
>>> key = b'AES-128 symm key'
>>> cipher = AES.new(key, AES.MODE_CTR, counter=ctr)
>>> cipher = AES.new(b'\x00'*16, AES.MODE_CTR, counter=ctr)
>>> ct = cipher.encrypt(pt)
:undocumented: __package__
@@ -57,15 +56,11 @@ if sys.version_info[0] == 2 and sys.version_info[1] == 1:
from Crypto.Util.py21compat import *
from Crypto.Util.py3compat import *
from Crypto.pct_warnings import DisableShortcut_DeprecationWarning
from Crypto.Util import _counter
import struct
import warnings
# Factory function
_deprecated = "deprecated"
def new(nbits, prefix=b(""), suffix=b(""), initial_value=1, overflow=0, little_endian=False, allow_wraparound=False, disable_shortcut=_deprecated):
def new(nbits, prefix=b(""), suffix=b(""), initial_value=1, overflow=0, little_endian=False, allow_wraparound=False, disable_shortcut=False):
"""Create a stateful counter block function suitable for CTR encryption modes.
Each call to the function returns the next counter block.
@@ -73,7 +68,7 @@ def new(nbits, prefix=b(""), suffix=b(""), initial_value=1, overflow=0, little_e
prefix || counter value || postfix
The counter value is incremented by 1 at each call.
The counter value is incremented by one at each call.
:Parameters:
nbits : integer
@@ -86,18 +81,17 @@ def new(nbits, prefix=b(""), suffix=b(""), initial_value=1, overflow=0, little_e
used.
initial_value : integer
The initial value of the counter. Default value is 1.
overflow : integer
This value is currently ignored.
little_endian : boolean
If *True*, the counter number will be encoded in little endian format.
If *False* (default), in big endian format.
If True, the counter number will be encoded in little endian format.
If False (default), in big endian format.
allow_wraparound : boolean
If *True*, the counter will automatically restart from zero after
reaching the maximum value (``2**nbits-1``).
If *False* (default), the object will raise an *OverflowError*.
disable_shortcut : deprecated
This option is a no-op for backward compatibility. It will be removed
in a future version. Don't use it.
If True, the function will raise an *OverflowError* exception as soon
as the counter wraps around. If False (default), the counter will
simply restart from zero.
disable_shortcut : boolean
If True, do not make ciphers from `Crypto.Cipher` bypass the Python
layer when invoking the counter block function.
If False (default), bypass the Python layer.
:Returns:
The counter block function.
"""
@@ -114,13 +108,10 @@ def new(nbits, prefix=b(""), suffix=b(""), initial_value=1, overflow=0, little_e
initval = _encode(initial_value, nbytes, little_endian)
if disable_shortcut is not _deprecated: # exact object comparison
warnings.warn("disable_shortcut has no effect and is deprecated", DisableShortcut_DeprecationWarning)
if little_endian:
return _counter._newLE(bstr(prefix), bstr(suffix), initval, allow_wraparound=allow_wraparound)
return _counter._newLE(bstr(prefix), bstr(suffix), initval, allow_wraparound=allow_wraparound, disable_shortcut=disable_shortcut)
else:
return _counter._newBE(bstr(prefix), bstr(suffix), initval, allow_wraparound=allow_wraparound)
return _counter._newBE(bstr(prefix), bstr(suffix), initval, allow_wraparound=allow_wraparound, disable_shortcut=disable_shortcut)
def _encode(n, nbytes, little_endian=False):
retval = []