Spaces:
Running
Running
File size: 6,179 Bytes
ba2f5d6 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 |
# -*- coding: utf-8 -*-
#
# ===================================================================
# The contents of this file are dedicated to the public domain. To
# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# ===================================================================
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, c_ubyte)
from Crypto.Hash.keccak import _raw_keccak_lib
class SHA3_224_Hash(object):
"""A SHA3-224 hash object.
Do not instantiate directly.
Use the :func:`new` function.
:ivar oid: ASN.1 Object ID
:vartype oid: string
:ivar digest_size: the size in bytes of the resulting hash
:vartype digest_size: integer
"""
# The size of the resulting hash in bytes.
digest_size = 28
# ASN.1 Object ID
oid = "2.16.840.1.101.3.4.2.7"
# Input block size for HMAC
block_size = 144
def __init__(self, data, update_after_digest):
self._update_after_digest = update_after_digest
self._digest_done = False
self._padding = 0x06
state = VoidPointer()
result = _raw_keccak_lib.keccak_init(state.address_of(),
c_size_t(self.digest_size * 2),
c_ubyte(24))
if result:
raise ValueError("Error %d while instantiating SHA-3/224"
% 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 SHA-3/224"
% 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),
c_ubyte(self._padding))
if result:
raise ValueError("Error %d while instantiating SHA-3/224"
% result)
self._digest_value = get_raw_buffer(bfr)
return self._digest_value
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 copy(self):
"""Return a copy ("clone") of the hash object.
The copy will have the same internal state as the original hash
object.
This can be used to efficiently compute the digests of strings that
share a common initial substring.
:return: A hash object of the same type
"""
clone = self.new()
result = _raw_keccak_lib.keccak_copy(self._state.get(),
clone._state.get())
if result:
raise ValueError("Error %d while copying SHA3-224" % result)
return clone
def new(self, data=None):
"""Create a fresh SHA3-224 hash object."""
return type(self)(data, self._update_after_digest)
def new(*args, **kwargs):
"""Create a new hash object.
Args:
data (byte string/byte array/memoryview):
The very first chunk of the message to hash.
It is equivalent to an early call to :meth:`update`.
update_after_digest (boolean):
Whether :meth:`digest` can be followed by another :meth:`update`
(default: ``False``).
:Return: A :class:`SHA3_224_Hash` hash object
"""
data = kwargs.pop("data", None)
update_after_digest = kwargs.pop("update_after_digest", False)
if len(args) == 1:
if data:
raise ValueError("Initial data for hash specified twice")
data = args[0]
if kwargs:
raise TypeError("Unknown parameters: " + str(kwargs))
return SHA3_224_Hash(data, update_after_digest)
# The size of the resulting hash in bytes.
digest_size = SHA3_224_Hash.digest_size
# Input block size for HMAC
block_size = 144
|