def last_index_as_trytes(self):
# type: () -> TryteString
"""
Returns a TryteString representation of the transaction's
:py:attr:`last_index`.
"""
# Note that we are padding to 27 *trits*.
return TryteString.from_trits(trits_from_int(self.last_index, pad=27))
def timestamp_as_trytes(self):
# type: () -> TryteString
"""
Returns a TryteString representation of the transaction's
:py:attr:`timestamp`.
"""
# Note that we are padding to 27 *trits*.
return TryteString.from_trits(trits_from_int(self.timestamp, pad=27))
def value_as_trytes(self):
# type: () -> TryteString
"""
Returns a TryteString representation of the transaction's
:py:attr:`value`.
"""
# Note that we are padding to 81 *trits*.
return TryteString.from_trits(trits_from_int(self.value, pad=81))
def attachment_timestamp_upper_bound_as_trytes(self):
# type: () -> TryteString
"""
Returns a TryteString representation of the transaction's
:py:attr:`attachment_timestamp_upper_bound`.
"""
# Note that we are padding to 27 *trits*.
return TryteString.from_trits(
trits_from_int(self.attachment_timestamp_upper_bound, pad=27), )
def as_trytes(self):
# type: () -> List[List[int]]
"""
Converts the TryteString into a sequence of trytes.
Each tryte is represented as a list with 3 trit values.
See :py:meth:`as_trits` for more info.
.. important::
:py:class:`TryteString` is not a numeric type, so the result
of this method should not be interpreted as an integer!
"""
return [trits_from_int(n, pad=3) for n in self.as_integers()]
def _create_sponge(self, index):
# type: (int) -> Kerl
"""
Prepares the hash sponge for the generator.
"""
seed = self.seed_as_trits[:]
sponge = Kerl()
sponge.absorb(add_trits(seed, trits_from_int(index)))
# Squeeze all of the trits out of the sponge and re-absorb them.
# Note that the sponge transforms several times per operation,
# so this sequence is not as redundant as it looks at first
# glance.
sponge.squeeze(seed)
sponge.reset()
sponge.absorb(seed)
return sponge