Delete keccak.py
This commit is contained in:
Evan Su
GitHub
parent
5514d128e6
commit
d3f390642a
174
audit/keccak.py
174
audit/keccak.py
|
|
@ -1,174 +0,0 @@
|
|||
# ===================================================================
|
||||
#
|
||||
# Copyright (c) 2015, Legrandin <helderijs@gmail.com>
|
||||
# All rights reserved.
|
||||
#
|
||||
# Redistribution and use in source and binary forms, with or without
|
||||
# modification, are permitted provided that the following conditions
|
||||
# are met:
|
||||
#
|
||||
# 1. Redistributions of source code must retain the above copyright
|
||||
# notice, this list of conditions and the following disclaimer.
|
||||
# 2. Redistributions in binary form must reproduce the above copyright
|
||||
# notice, this list of conditions and the following disclaimer in
|
||||
# the documentation and/or other materials provided with the
|
||||
# distribution.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
# POSSIBILITY OF SUCH DAMAGE.
|
||||
# ===================================================================
|
||||
|
||||
from Crypto.Util.py3compat import bord
|
||||
|
||||
from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
|
||||
VoidPointer, SmartPointer,
|
||||
create_string_buffer,
|
||||
get_raw_buffer, c_size_t,
|
||||
c_uint8_ptr)
|
||||
|
||||
_raw_keccak_lib = load_pycryptodome_raw_lib("Crypto.Hash._keccak",
|
||||
"""
|
||||
int keccak_init(void **state,
|
||||
size_t capacity_bytes,
|
||||
uint8_t padding_byte);
|
||||
int keccak_destroy(void *state);
|
||||
int keccak_absorb(void *state,
|
||||
const uint8_t *in,
|
||||
size_t len);
|
||||
int keccak_squeeze(const void *state,
|
||||
uint8_t *out,
|
||||
size_t len);
|
||||
int keccak_digest(void *state, uint8_t *digest, size_t len);
|
||||
int keccak_copy(const void *src, void *dst);
|
||||
""")
|
||||
|
||||
class Keccak_Hash(object):
|
||||
"""A Keccak hash object.
|
||||
Do not instantiate directly.
|
||||
Use the :func:`new` function.
|
||||
|
||||
:ivar digest_size: the size in bytes of the resulting hash
|
||||
:vartype digest_size: integer
|
||||
"""
|
||||
|
||||
def __init__(self, data, digest_bytes, update_after_digest):
|
||||
# The size of the resulting hash in bytes.
|
||||
self.digest_size = digest_bytes
|
||||
|
||||
self._update_after_digest = update_after_digest
|
||||
self._digest_done = False
|
||||
|
||||
state = VoidPointer()
|
||||
result = _raw_keccak_lib.keccak_init(state.address_of(),
|
||||
c_size_t(self.digest_size * 2),
|
||||
0x01)
|
||||
if result:
|
||||
raise ValueError("Error %d while instantiating keccak" % result)
|
||||
self._state = SmartPointer(state.get(),
|
||||
_raw_keccak_lib.keccak_destroy)
|
||||
if data:
|
||||
self.update(data)
|
||||
|
||||
def update(self, data):
|
||||
"""Continue hashing of a message by consuming the next chunk of data.
|
||||
|
||||
Args:
|
||||
data (byte string/byte array/memoryview): The next chunk of the message being hashed.
|
||||
"""
|
||||
|
||||
if self._digest_done and not self._update_after_digest:
|
||||
raise TypeError("You can only call 'digest' or 'hexdigest' on this object")
|
||||
|
||||
result = _raw_keccak_lib.keccak_absorb(self._state.get(),
|
||||
c_uint8_ptr(data),
|
||||
c_size_t(len(data)))
|
||||
if result:
|
||||
raise ValueError("Error %d while updating keccak" % result)
|
||||
return self
|
||||
|
||||
def digest(self):
|
||||
"""Return the **binary** (non-printable) digest of the message that has been hashed so far.
|
||||
|
||||
:return: The hash digest, computed over the data processed so far.
|
||||
Binary form.
|
||||
:rtype: byte string
|
||||
"""
|
||||
|
||||
self._digest_done = True
|
||||
bfr = create_string_buffer(self.digest_size)
|
||||
result = _raw_keccak_lib.keccak_digest(self._state.get(),
|
||||
bfr,
|
||||
c_size_t(self.digest_size))
|
||||
if result:
|
||||
raise ValueError("Error %d while squeezing keccak" % result)
|
||||
|
||||
return get_raw_buffer(bfr)
|
||||
|
||||
def hexdigest(self):
|
||||
"""Return the **printable** digest of the message that has been hashed so far.
|
||||
|
||||
:return: The hash digest, computed over the data processed so far.
|
||||
Hexadecimal encoded.
|
||||
:rtype: string
|
||||
"""
|
||||
|
||||
return "".join(["%02x" % bord(x) for x in self.digest()])
|
||||
|
||||
def new(self, **kwargs):
|
||||
"""Create a fresh Keccak hash object."""
|
||||
|
||||
if "digest_bytes" not in kwargs and "digest_bits" not in kwargs:
|
||||
kwargs["digest_bytes"] = self.digest_size
|
||||
|
||||
return new(**kwargs)
|
||||
|
||||
|
||||
def new(**kwargs):
|
||||
"""Create a new hash object.
|
||||
|
||||
Args:
|
||||
data (bytes/bytearray/memoryview):
|
||||
The very first chunk of the message to hash.
|
||||
It is equivalent to an early call to :meth:`Keccak_Hash.update`.
|
||||
digest_bytes (integer):
|
||||
The size of the digest, in bytes (28, 32, 48, 64).
|
||||
digest_bits (integer):
|
||||
The size of the digest, in bits (224, 256, 384, 512).
|
||||
update_after_digest (boolean):
|
||||
Whether :meth:`Keccak.digest` can be followed by another
|
||||
:meth:`Keccak.update` (default: ``False``).
|
||||
|
||||
:Return: A :class:`Keccak_Hash` hash object
|
||||
"""
|
||||
|
||||
data = kwargs.pop("data", None)
|
||||
update_after_digest = kwargs.pop("update_after_digest", False)
|
||||
|
||||
digest_bytes = kwargs.pop("digest_bytes", None)
|
||||
digest_bits = kwargs.pop("digest_bits", None)
|
||||
if None not in (digest_bytes, digest_bits):
|
||||
raise TypeError("Only one digest parameter must be provided")
|
||||
if (None, None) == (digest_bytes, digest_bits):
|
||||
raise TypeError("Digest size (bits, bytes) not provided")
|
||||
if digest_bytes is not None:
|
||||
if digest_bytes not in (28, 32, 48, 64):
|
||||
raise ValueError("'digest_bytes' must be: 28, 32, 48 or 64")
|
||||
else:
|
||||
if digest_bits not in (224, 256, 384, 512):
|
||||
raise ValueError("'digest_bytes' must be: 224, 256, 384 or 512")
|
||||
digest_bytes = digest_bits // 8
|
||||
|
||||
if kwargs:
|
||||
raise TypeError("Unknown parameters: " + str(kwargs))
|
||||
|
||||
return Keccak_Hash(data, digest_bytes, update_after_digest)
|
||||
Loading…
Reference in New Issue