def _set_out_tx_out(
state: State,
dst_entr: MoneroTransactionDestinationEntry,
tx_out_key: crypto.Point,
derivation: crypto.Point,
) -> tuple[bytes, bytes]:
"""
Manually serializes TxOut(0, TxoutToKey(key)) and calculates hmac.
"""
use_tags = state.hard_fork >= 15
tx_out_bin = bytearray(35 if use_tags else 34)
tx_out_bin[0] = 0 # amount varint
tx_out_bin[1] = (3 if use_tags else 2
) # variant code txout_to_tagged_key or txout_to_key
crypto.encodepoint_into(tx_out_bin, tx_out_key, 2)
if use_tags:
view_tag = _derive_view_tags(derivation, state.current_output_index)
tx_out_bin[-1] = view_tag[0]
state.mem_trace(8, True)
# Tx header prefix hashing
state.tx_prefix_hasher.buffer(tx_out_bin)
state.mem_trace(9, True)
# Hmac dst_entr
hmac_vouti = offloading_keys.gen_hmac_vouti(state.key_hmac, dst_entr,
tx_out_bin,
state.current_output_index)
state.mem_trace(10, True)
return tx_out_bin, hmac_vouti
def _set_out_tx_out(state: State, dst_entr: MoneroTransactionDestinationEntry,
tx_out_key: Ge25519) -> Tuple[bytes, bytes]:
"""
Manually serializes TxOut(0, TxoutToKey(key)) and calculates hmac.
"""
tx_out_bin = bytearray(34)
tx_out_bin[0] = 0 # amount varint
tx_out_bin[1] = 2 # variant code TxoutToKey
crypto.encodepoint_into(tx_out_bin, tx_out_key, 2)
state.mem_trace(8)
# Tx header prefix hashing
state.tx_prefix_hasher.buffer(tx_out_bin)
state.mem_trace(9, True)
# Hmac dst_entr
hmac_vouti = offloading_keys.gen_hmac_vouti(state.key_hmac, dst_entr,
tx_out_bin,
state.current_output_index)
state.mem_trace(10, True)
return tx_out_bin, hmac_vouti