Esempio n. 1
0
    def read(self, length):
        """
        Compute the next piece of XOF output.

        .. note::
            You cannot use :meth:`update` anymore after the first call to
            :meth:`read`.

        Args:
            length (integer): the amount of bytes this method must return

        :return: the next piece of XOF output (of the given length)
        :rtype: byte string
        """

        self._is_squeezing = True
        bfr = create_string_buffer(length)
        result = _raw_keccak_lib.keccak_squeeze(self._state.get(),
                                                bfr,
                                                c_size_t(length))
        if result:
            raise ValueError("Error %d while extracting from SHAKE128"
                             % result)

        return get_raw_buffer(bfr)
Esempio n. 2
0
    def read(self, length):
        """
        Compute the next piece of XOF output.

        .. note::
            You cannot use :meth:`update` anymore after the first call to
            :meth:`read`.

        Args:
            length (integer): the amount of bytes this method must return

        :return: the next piece of XOF output (of the given length)
        :rtype: byte string
        """

        self._is_squeezing = True
        bfr = create_string_buffer(length)
        result = _raw_keccak_lib.keccak_squeeze(self._state.get(),
                                                bfr,
                                                c_size_t(length))
        if result:
            raise ValueError("Error %d while extracting from SHAKE256"
                             % result)

        return get_raw_buffer(bfr)
Esempio n. 3
0
    def read(self, length):
        """Return the next ``length`` bytes of **binary** (non-printable)
        digest for the message.

        You cannot use ``update`` anymore after the first call to ``read``.

        :Return: A byte string of `length` bytes.
        """

        self._is_squeezing = True
        bfr = create_string_buffer(length)
        result = _raw_keccak_lib.keccak_squeeze(self._state.get(), bfr, c_size_t(length))
        if result:
            raise ValueError("Error %d while extracting from SHAKE256" % result)

        return get_raw_buffer(bfr)
Esempio n. 4
0
    def read(self, length):
        """Return the next ``length`` bytes of **binary** (non-printable)
        digest for the message.

        You cannot use ``update`` anymore after the first call to ``read``.

        :Return: A byte string of `length` bytes.
        """

        self._is_squeezing = True
        bfr = create_string_buffer(length)
        result = _raw_keccak_lib.keccak_squeeze(self._state.get(), bfr,
                                                c_size_t(length))
        if result:
            raise ValueError("Error %d while extracting from SHAKE256" %
                             result)

        return get_raw_buffer(bfr)