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148 lines
5.2 KiB
148 lines
5.2 KiB
# -*- coding: utf-8 -*-
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#
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# ===================================================================
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# The contents of this file are dedicated to the public domain. To
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# the extent that dedication to the public domain is not available,
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# everyone is granted a worldwide, perpetual, royalty-free,
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# non-exclusive license to exercise all rights associated with the
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# contents of this file for any purpose whatsoever.
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# No rights are reserved.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# ===================================================================
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from Crypto.Util.py3compat import bord
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from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
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VoidPointer, SmartPointer,
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create_string_buffer,
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get_raw_buffer, c_size_t,
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c_uint8_ptr)
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from Crypto.Hash.keccak import _raw_keccak_lib
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class SHA3_384_Hash(object):
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"""A SHA3-384 hash object.
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Do not instantiate directly.
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Use the :func:`new` function.
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:ivar oid: ASN.1 Object ID
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:vartype oid: string
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:ivar digest_size: the size in bytes of the resulting hash
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:vartype digest_size: integer
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"""
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# The size of the resulting hash in bytes.
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digest_size = 48
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# ASN.1 Object ID
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oid = "2.16.840.1.101.3.4.2.9"
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def __init__(self, data, update_after_digest):
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self._update_after_digest = update_after_digest
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self._digest_done = False
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state = VoidPointer()
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result = _raw_keccak_lib.keccak_init(state.address_of(),
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c_size_t(self.digest_size * 2),
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0x06)
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if result:
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raise ValueError("Error %d while instantiating SHA-3/384"
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% result)
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self._state = SmartPointer(state.get(),
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_raw_keccak_lib.keccak_destroy)
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if data:
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self.update(data)
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def update(self, data):
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"""Continue hashing of a message by consuming the next chunk of data.
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Args:
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data (byte string/byte array/memoryview): The next chunk of the message being hashed.
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"""
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if self._digest_done and not self._update_after_digest:
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raise TypeError("You can only call 'digest' or 'hexdigest' on this object")
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result = _raw_keccak_lib.keccak_absorb(self._state.get(),
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c_uint8_ptr(data),
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c_size_t(len(data)))
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if result:
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raise ValueError("Error %d while updating SHA-3/384"
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% result)
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return self
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def digest(self):
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"""Return the **binary** (non-printable) digest of the message that has been hashed so far.
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:return: The hash digest, computed over the data processed so far.
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Binary form.
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:rtype: byte string
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"""
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self._digest_done = True
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bfr = create_string_buffer(self.digest_size)
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result = _raw_keccak_lib.keccak_digest(self._state.get(),
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bfr,
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c_size_t(self.digest_size))
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if result:
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raise ValueError("Error %d while instantiating SHA-3/384"
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% result)
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self._digest_value = get_raw_buffer(bfr)
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return self._digest_value
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def hexdigest(self):
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"""Return the **printable** digest of the message that has been hashed so far.
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:return: The hash digest, computed over the data processed so far.
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Hexadecimal encoded.
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:rtype: string
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"""
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return "".join(["%02x" % bord(x) for x in self.digest()])
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def new(self):
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"""Create a fresh SHA3-384 hash object."""
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return type(self)(None, self._update_after_digest)
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def new(*args, **kwargs):
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"""Create a new hash object.
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Args:
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data (byte string/byte array/memoryview):
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The very first chunk of the message to hash.
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It is equivalent to an early call to :meth:`update`.
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update_after_digest (boolean):
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Whether :meth:`digest` can be followed by another :meth:`update`
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(default: ``False``).
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:Return: A :class:`SHA3_384_Hash` hash object
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"""
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data = kwargs.pop("data", None)
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update_after_digest = kwargs.pop("update_after_digest", False)
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if len(args) == 1:
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if data:
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raise ValueError("Initial data for hash specified twice")
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data = args[0]
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if kwargs:
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raise TypeError("Unknown parameters: " + str(kwargs))
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return SHA3_384_Hash(data, update_after_digest)
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# The size of the resulting hash in bytes.
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digest_size = SHA3_384_Hash.digest_size
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