async def gen_rct(
self, in_sk, destinations, amounts, mix_ring, kLRki, msout, index
):
"""
Full ring CT signature.
Used when there is only one input transaction to spend.
:param in_sk:
:param destinations:
:param amounts:
:param mix_ring:
:param kLRki:
:param msout:
:param index:
:param out_sk:
:return:
"""
if len(amounts) != len(destinations) and len(amounts) != len(destinations) + 1:
raise ValueError("Different number of amounts/destinations")
if len(self.output_secrets) != len(destinations):
raise ValueError("Different number of amount_keys/destinations")
if index >= len(mix_ring):
raise ValueError("Bad index into mix ring")
for n in range(len(mix_ring)):
if len(mix_ring[n]) != len(in_sk):
raise ValueError("Bad mixring size")
if (not kLRki or not msout) and (kLRki or msout):
raise ValueError("Only one of kLRki/mscout is present")
rv, sumout, out_sk = await self.gen_rct_header(destinations, amounts)
rv.type = (
xmrtypes.RctType.FullBulletproof
if self.use_bulletproof
else xmrtypes.RctType.Full
)
if len(amounts) > len(destinations):
rv.txnFee = amounts[len(destinations)]
else:
rv.txnFee = 0
txn_fee_key = crypto.scalarmult_h(rv.txnFee)
rv.mixRing = mix_ring
# TODO: msout multisig
full_message = await monero.get_pre_mlsag_hash(rv)
mg, msc = mlsag2.prove_rct_mg(
full_message,
rv.mixRing,
in_sk,
out_sk,
rv.outPk,
kLRki,
None,
index,
txn_fee_key,
)
rv.p.MGs = [mg]
if __debug__:
assert mlsag2.ver_rct_mg(
rv.p.MGs[0], rv.mixRing, rv.outPk, txn_fee_key, full_message
)
return rv
async def sign_input(
self,
src_entr,
vini,
hmac_vini,
pseudo_out,
pseudo_out_hmac,
alpha_enc,
spend_enc,
):
"""
Generates a signature for one input.
:param src_entr: Source entry
:type src_entr: monero_glue.xmr.serialize_messages.tx_construct.TxSourceEntry
:param vini: tx.vin[i] for the transaction. Contains key image, offsets, amount (usually zero)
:param hmac_vini: HMAC for the tx.vin[i] as returned from Trezor
:param pseudo_out: pedersen commitment for the current input, uses alpha as the mask.
Only in memory offloaded scenario. Tuple containing HMAC, as returned from the Trezor.
:param pseudo_out_hmac:
:param alpha_enc: alpha mask for the current input. Only in memory offloaded scenario,
tuple as returned from the Trezor
:param spend_enc:
:return: Generated signature MGs[i]
"""
self.state.set_signature()
await self.trezor.iface.transaction_step(
self.STEP_SIGN, self.inp_idx + 1, self.num_inputs()
)
self.inp_idx += 1
if self.inp_idx >= self.num_inputs():
raise ValueError("Invalid ins")
if self.use_simple_rct and (not self.in_memory() and alpha_enc is None):
raise ValueError("Inconsistent1")
if self.use_simple_rct and (not self.in_memory() and pseudo_out is None):
raise ValueError("Inconsistent2")
if self.inp_idx >= 1 and not self.use_simple_rct:
raise ValueError("Inconsistent3")
inv_idx = self.source_permutation[self.inp_idx]
# Check HMAC of all inputs
hmac_vini_comp = await self.gen_hmac_vini(src_entr, vini, inv_idx)
if not common.ct_equal(hmac_vini_comp, hmac_vini):
raise ValueError("HMAC is not correct")
gc.collect()
self._log_trace(1)
if self.use_simple_rct and not self.in_memory():
pseudo_out_hmac_comp = crypto.compute_hmac(
self.hmac_key_txin_comm(inv_idx), pseudo_out
)
if not common.ct_equal(pseudo_out_hmac_comp, pseudo_out_hmac):
raise ValueError("HMAC is not correct")
gc.collect()
self._log_trace(2)
from monero_glue.xmr.enc import chacha_poly
alpha_c = crypto.decodeint(
chacha_poly.decrypt_pack(
self.enc_key_txin_alpha(inv_idx), bytes(alpha_enc)
)
)
pseudo_out_c = crypto.decodepoint(pseudo_out)
elif self.use_simple_rct:
alpha_c = self.input_alphas[self.inp_idx]
pseudo_out_c = crypto.decodepoint(self.input_pseudo_outs[self.inp_idx])
else:
alpha_c = None
pseudo_out_c = None
# Spending secret
if self.many_inputs():
from monero_glue.xmr.enc import chacha_poly
input_secret = crypto.decodeint(
chacha_poly.decrypt_pack(self.enc_key_spend(inv_idx), bytes(spend_enc))
)
else:
input_secret = self.input_secrets[self.inp_idx]
gc.collect()
self._log_trace(3)
# Basic setup, sanity check
index = src_entr.real_output
in_sk = misc.StdObj(dest=input_secret, mask=crypto.decodeint(src_entr.mask))
kLRki = src_entr.multisig_kLRki if self.multi_sig else None
# Private key correctness test
self.assrt(
crypto.point_eq(
crypto.decodepoint(src_entr.outputs[src_entr.real_output][1].dest),
crypto.scalarmult_base(in_sk.dest),
),
"a1",
)
self.assrt(
crypto.point_eq(
crypto.decodepoint(src_entr.outputs[src_entr.real_output][1].mask),
crypto.gen_c(in_sk.mask, src_entr.amount),
),
"a2",
)
gc.collect()
self._log_trace(4)
# RCT signature
gc.collect()
from monero_glue.xmr import mlsag2
mg = None
if self.use_simple_rct:
# Simple RingCT
mix_ring = [x[1] for x in src_entr.outputs]
mg, msc = mlsag2.prove_rct_mg_simple(
self.full_message,
mix_ring,
in_sk,
alpha_c,
pseudo_out_c,
kLRki,
None,
index,
)
if __debug__:
self.assrt(
mlsag2.ver_rct_mg_simple(
self.full_message, mg, mix_ring, pseudo_out_c
)
)
else:
# Full RingCt, only one input
txn_fee_key = crypto.scalarmult_h(self.get_fee())
mix_ring = [[x[1]] for x in src_entr.outputs]
mg, msc = mlsag2.prove_rct_mg(
self.full_message,
mix_ring,
[in_sk],
self.output_sk,
self.output_pk,
kLRki,
None,
index,
txn_fee_key,
)
if __debug__:
self.assrt(
mlsag2.ver_rct_mg(
mg, mix_ring, self.output_pk, txn_fee_key, self.full_message
)
)
gc.collect()
self._log_trace(5)
# Encode
from monero_glue.xmr.sub.recode import recode_msg
mgs = recode_msg([mg])
cout = None
gc.collect()
self._log_trace(6)
# Multisig values returned encrypted, keys returned after finished successfully.
if self.multi_sig:
from monero_glue.xmr.enc import chacha_poly
cout = chacha_poly.encrypt_pack(self.enc_key_cout(), crypto.encodeint(msc))
# Final state transition
if self.inp_idx + 1 == self.num_inputs():
self.state.set_signature_done()
await self.trezor.iface.transaction_signed()
gc.collect()
self._log_trace()
from monero_glue.messages.MoneroTransactionSignInputAck import (
MoneroTransactionSignInputAck
)
return MoneroTransactionSignInputAck(
signature=await misc.dump_msg_gc(mgs[0], preallocate=488, del_msg=True),
cout=cout,
)
async def verify(self, tx, con_data=None, creds=None):
"""
Transaction verification
:param tx:
:param con_data:
:param creds:
:return:
"""
# Unserialize the transaction
tx_obj = xmrtypes.Transaction()
reader = xmrserialize.MemoryReaderWriter(bytearray(tx))
ar1 = xmrserialize.Archive(reader, False)
await ar1.message(tx_obj, msg_type=xmrtypes.Transaction)
extras = await monero.parse_extra_fields(tx_obj.extra)
monero.expand_transaction(tx_obj)
tx_pub = crypto.decodepoint(monero.find_tx_extra_field_by_type(
extras, xmrtypes.TxExtraPubKey
).pub_key)
additional_pub_keys = monero.find_tx_extra_field_by_type(
extras, xmrtypes.TxExtraAdditionalPubKeys
)
additional_pub_keys = [crypto.decodepoint(x) for x in additional_pub_keys.data] if additional_pub_keys is not None else None
# Verify range proofs
out_idx = 0
is_bp = tx_obj.rct_signatures.type in [RctType.SimpleBulletproof, RctType.FullBulletproof]
if not is_bp:
for idx, rsig in enumerate(tx_obj.rct_signatures.p.rangeSigs):
out_pk = tx_obj.rct_signatures.outPk[idx]
C = crypto.decodepoint(out_pk.mask)
rsig = tx_obj.rct_signatures.p.rangeSigs[idx]
res = ring_ct.ver_range(C, rsig, use_bulletproof=is_bp)
self.assertTrue(res)
else:
for idx, rsig in enumerate(tx_obj.rct_signatures.p.bulletproofs):
rsig_num_outs = min(len(tx_obj.rct_signatures.outPk), 1 << (len(rsig.L) - 6))
outs = tx_obj.rct_signatures.outPk[out_idx : out_idx + rsig_num_outs]
rsig.V = [crypto.encodepoint(ring_ct.bp_comm_to_v(crypto.decodepoint(xx.mask))) for xx in outs]
res = ring_ct.ver_range(None, rsig, use_bulletproof=is_bp)
self.assertTrue(res)
# Prefix hash
prefix_hash = await monero.get_transaction_prefix_hash(tx_obj)
is_simple = len(tx_obj.vin) > 1 or is_bp
self.assertEqual(prefix_hash, con_data.tx_prefix_hash)
tx_obj.rct_signatures.message = prefix_hash
# MLSAG hash
mlsag_hash = await monero.get_pre_mlsag_hash(tx_obj.rct_signatures)
# Decrypt transaction key
tx_key = misc.compute_tx_key(creds.spend_key_private, prefix_hash, salt=con_data.enc_salt1, rand_mult=con_data.enc_salt2)[0]
key_buff = chacha_poly.decrypt_pack(tx_key, con_data.enc_keys)
tx_priv_keys = [crypto.decodeint(x) for x in common.chunk(key_buff, 32) if x]
tx_priv = tx_priv_keys[0]
tx_additional_priv = tx_priv_keys[1:]
# Verify mlsag signature
monero.recode_msg(tx_obj.rct_signatures.p.MGs, encode=False)
for idx in range(len(tx_obj.vin)):
if is_simple:
mix_ring = [MoneroRctKeyPublic(dest=x[1].dest, commitment=x[1].mask) for x in con_data.tx_data.sources[idx].outputs]
if is_bp:
pseudo_out = crypto.decodepoint(bytes(tx_obj.rct_signatures.p.pseudoOuts[idx]))
else:
pseudo_out = crypto.decodepoint(bytes(tx_obj.rct_signatures.pseudoOuts[idx]))
self.assertTrue(mlsag2.ver_rct_mg_simple(
mlsag_hash, tx_obj.rct_signatures.p.MGs[idx], mix_ring, pseudo_out
))
else:
txn_fee_key = crypto.scalarmult_h(tx_obj.rct_signatures.txnFee)
mix_ring = [[MoneroRctKeyPublic(dest=x[1].dest, commitment=x[1].mask)] for x in con_data.tx_data.sources[idx].outputs]
self.assertTrue(mlsag2.ver_rct_mg(
tx_obj.rct_signatures.p.MGs[idx], mix_ring, tx_obj.rct_signatures.outPk, txn_fee_key, mlsag_hash
))
async def test_node_transaction(self):
tx_j = pkg_resources.resource_string(
__name__, os.path.join("data", "tsx_01.json"))
tx_c = pkg_resources.resource_string(
__name__, os.path.join("data", "tsx_01_plain.txt"))
tx_u_c = pkg_resources.resource_string(
__name__, os.path.join("data", "tsx_01_uns.txt"))
tx_js = json.loads(tx_j.decode("utf8"))
reader = xmrserialize.MemoryReaderWriter(
bytearray(binascii.unhexlify(tx_c)))
ar = xmrserialize.Archive(reader, False, self._get_bc_ver())
tx = xmrtypes.Transaction()
await ar.message(tx)
reader = xmrserialize.MemoryReaderWriter(
bytearray(binascii.unhexlify(tx_u_c)))
ar = xmrserialize.Archive(reader, False, self._get_bc_ver())
uns = xmrtypes.UnsignedTxSet()
await ar.message(uns)
# Test message hash computation
tx_prefix_hash = await monero.get_transaction_prefix_hash(tx)
message = binascii.unhexlify(tx_js["tx_prefix_hash"])
self.assertEqual(tx_prefix_hash, message)
# RingCT, range sigs, hash
rv = tx.rct_signatures
rv.message = message
rv.mixRing = self.mixring(tx_js)
digest = await monero.get_pre_mlsag_hash(rv)
full_message = binascii.unhexlify(tx_js["pre_mlsag_hash"])
self.assertEqual(digest, full_message)
# Recompute missing data
monero.expand_transaction(tx)
# Unmask ECDH data, check range proofs
for i in range(len(tx_js["amount_keys"])):
ecdh = monero.copy_ecdh(rv.ecdhInfo[i])
monero.recode_ecdh(ecdh, encode=False)
ecdh = ring_ct.ecdh_decode(ecdh,
derivation=binascii.unhexlify(
tx_js["amount_keys"][i]))
self.assertEqual(crypto.sc_get64(ecdh.amount),
tx_js["outamounts"][i])
self.assertTrue(
crypto.sc_eq(
ecdh.mask,
crypto.decodeint(
binascii.unhexlify(tx_js["outSk"][i])[32:]),
))
C = crypto.decodepoint(rv.outPk[i].mask)
rsig = rv.p.rangeSigs[i]
res = ring_ct.ver_range(C, rsig)
self.assertTrue(res)
res = ring_ct.ver_range(
crypto.point_add(C, crypto.scalarmult_base(crypto.sc_init(3))),
rsig)
self.assertFalse(res)
is_simple = len(tx.vin) > 1
monero.recode_rct(rv, encode=False)
if is_simple:
for index in range(len(rv.p.MGs)):
pseudo_out = crypto.decodepoint(
binascii.unhexlify(
tx_js["tx"]["rct_signatures"]["pseudoOuts"][index]))
r = mlsag2.ver_rct_mg_simple(full_message, rv.p.MGs[index],
rv.mixRing[index], pseudo_out)
self.assertTrue(r)
r = mlsag2.ver_rct_mg_simple(full_message, rv.p.MGs[index],
rv.mixRing[index - 1], pseudo_out)
self.assertFalse(r)
else:
txn_fee_key = crypto.scalarmult_h(rv.txnFee)
r = mlsag2.ver_rct_mg(rv.p.MGs[0], rv.mixRing, rv.outPk,
txn_fee_key, digest)
self.assertTrue(r)
r = mlsag2.ver_rct_mg(
rv.p.MGs[0],
rv.mixRing,
rv.outPk,
crypto.scalarmult_h(rv.txnFee - 100),
digest,
)
self.assertFalse(r)