# -*- 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 Cryptodome.Util.py3compat import bord from Cryptodome.Util._raw_api import (load_pycryptodome_raw_lib, VoidPointer, SmartPointer, create_string_buffer, get_raw_buffer, c_size_t, c_uint8_ptr) from Cryptodome.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" def __init__(self, data, update_after_digest): 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), 0x06) 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)) 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 new(self): """Create a fresh SHA3-224 hash object.""" return type(self)(None, 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