iota/crypto/kerl/pykerl.py
def absorb(self, trits, offset=0, length=None):
        # type: (MutableSequence[int], int, Optional[int]) -> None
        """
        Absorb trits into the sponge from a buffer.

        :param trits:
            Buffer that contains the trits to absorb.

        :param offset:
            Starting offset in ``trits``.

        :param length:
            Number of trits to absorb.  Defaults to ``len(trits)``.
        """
        # Pad input if necessary, so that it can be divided evenly into
        # hashes.
        # Note that this operation creates a COPY of ``trits``; the
        # incoming buffer is not modified!
        pad = ((len(trits) % TRIT_HASH_LENGTH) or TRIT_HASH_LENGTH)
        trits += [0] * (TRIT_HASH_LENGTH - pad)

        if length is None:
            length = len(trits)

        if length < 1:
            raise with_context(
                exc=ValueError('Invalid length passed to ``absorb``.'),

                context={
                    'trits': trits,
                    'offset': offset,
                    'length': length,
                },
            )

        while offset < length:
            stop = min(offset + TRIT_HASH_LENGTH, length)

            # If we're copying over a full chunk, zero last trit.
            if stop - offset == TRIT_HASH_LENGTH:
                trits[stop - 1] = 0

            signed_nums = conv.convertToBytes(trits[offset:stop])

            # Convert signed bytes into their equivalent unsigned
            # representation, in order to use Python's built-in bytes
            # type.
            unsigned_bytes = bytearray(
                conv.convert_sign(b) for b in signed_nums
            )

            self.k.update(unsigned_bytes)

            offset += TRIT_HASH_LENGTH
def absorb(self, trits, offset=0, length=None):
        # type: (MutableSequence[int], int, Optional[int]) -> None
        """
        Absorb trits into the sponge from a buffer.

        :param trits:
            Buffer that contains the trits to absorb.

        :param offset:
            Starting offset in ``trits``.

        :param length:
            Number of trits to absorb.  Defaults to ``len(trits)``.
        """
        # Pad input if necessary, so that it can be divided evenly into
        # hashes.
        # Note that this operation creates a COPY of ``trits``; the
        # incoming buffer is not modified!
        pad = ((len(trits) % TRIT_HASH_LENGTH) or TRIT_HASH_LENGTH)
        trits += [0] * (TRIT_HASH_LENGTH - pad)

        if length is None:
            length = len(trits)

        if length < 1:
            raise with_context(
                exc=ValueError('Invalid length passed to ``absorb``.'),

                context={
                    'trits': trits,
                    'offset': offset,
                    'length': length,
                },
            )

        while offset < length:
            stop = min(offset + TRIT_HASH_LENGTH, length)

            # If we're copying over a full chunk, zero last trit.
            if stop - offset == TRIT_HASH_LENGTH:
                trits[stop - 1] = 0

            signed_nums = conv.convertToBytes(trits[offset:stop])

            # Convert signed bytes into their equivalent unsigned
            # representation, in order to use Python's built-in bytes
            # type.
            unsigned_bytes = bytearray(
                conv.convert_sign(b) for b in signed_nums
            )

            self.k.update(unsigned_bytes)

            offset += TRIT_HASH_LENGTH
Absorb trits into the sponge from a buffer.

        :param trits:
            Buffer that contains the trits to absorb.

        :param offset:
            Starting offset in ``trits``.

        :param length:
            Number of trits to absorb.  Defaults to ``len(trits)``.