def __init__(self, value, start, lengths, entries_per_block):
oram.Block.__init__(self, value, lengths)
length = sum(self.lengths)
used_bits = entries_per_block * length
self.value_bits = self.value.bit_decompose(used_bits)
start_length = util.log2(entries_per_block)
self.start_bits = util.bit_decompose(start, start_length)
self.start_demux = oram.demux_list(self.start_bits)
self.entries = [sbits.bit_compose(self.value_bits[i*length:][:length]) \
for i in range(entries_per_block)]
self.mul_entries = list(map(operator.mul, self.start_demux, self.entries))
self.bits = sum(self.mul_entries).bit_decompose()
self.mul_value = sbits.compose(self.mul_entries, sum(self.lengths))
self.anti_value = self.mul_value + self.value
def __init__(self, value, start, lengths, entries_per_block):
oram.Block.__init__(self, value, lengths)
length = sum(self.lengths)
used_bits = entries_per_block * length
self.value_bits = self.value.bit_decompose(used_bits)
start_length = util.log2(entries_per_block)
self.start_bits = util.bit_decompose(start, start_length)
self.start_demux = oram.demux_list(self.start_bits)
self.entries = [sbits.bit_compose(self.value_bits[i*length:][:length]) \
for i in range(entries_per_block)]
self.mul_entries = map(operator.mul, self.start_demux, self.entries)
self.bits = sum(self.mul_entries).bit_decompose()
self.mul_value = sbits.compose(self.mul_entries, sum(self.lengths))
self.anti_value = self.mul_value + self.value
