def test_two_party_proof():
secp = Secp256k1(None, FLAG_ALL)
secret_key_a = SecretKey.random(secp)
public_key_a = secret_key_a.to_public_key(secp)
child_key_a = ChildKey(0, Identifier.random(), Identifier.random(),
secret_key_a)
secret_key_b = SecretKey.random(secp)
public_key_b = secret_key_b.to_public_key(secp)
child_key_b = ChildKey(0, Identifier.random(), Identifier.random(),
secret_key_b)
amount = randint(1, 999999)
commit = secp.commit_sum(
[secp.commit(amount, secret_key_a),
secp.commit(0, secret_key_b)], [])
tpp_a = TwoPartyBulletProof(secp, child_key_a, public_key_b, amount,
commit)
tpp_b = TwoPartyBulletProof(secp, child_key_b, public_key_a, amount,
commit)
t_1_a, t_2_a = tpp_a.round_1()
t_1_b, t_2_b = tpp_b.round_1()
tpp_a.fill_round_1(t_1_b, t_2_b)
tpp_b.fill_round_1(t_1_a, t_2_a)
tau_x_a = tpp_a.round_2()
tau_x_b = tpp_b.round_2()
tpp_a.fill_round_2(tau_x_b)
tpp_b.fill_round_2(tau_x_a)
proof_a = tpp_a.finalize()
assert secp.verify_bullet_proof(commit, proof_a, bytearray())
proof_b = tpp_b.finalize()
assert proof_a == proof_b
def test_partial_sig():
secp = Secp256k1(None, FLAG_ALL)
excess = SecretKey.random(secp)
public_excess = excess.to_public_key(secp)
nonce = SecretKey.random(secp)
public_key_sum = SecretKey.random(secp).to_public_key(secp)
public_nonce_sum = SecretKey.random(secp).to_public_key(secp)
fee = randint(1, 999999)
lock_height = randint(1, 999999)
sig = aggsig.calculate_partial(secp, excess, nonce, public_key_sum,
public_nonce_sum, fee, lock_height)
assert aggsig.verify_partial(secp, sig, public_excess, public_key_sum,
public_nonce_sum, fee, lock_height)
rnd_sig = Signature(bytearray(urandom(64)))
assert not aggsig.verify_partial(secp, rnd_sig, public_excess,
public_key_sum, public_nonce_sum, fee,
lock_height)
public_rnd = SecretKey.random(secp).to_public_key(secp)
assert not aggsig.verify_partial(secp, sig, public_rnd, public_key_sum,
public_nonce_sum, fee, lock_height)
assert not aggsig.verify_partial(secp, sig, public_excess, public_rnd,
public_nonce_sum, fee, lock_height)
assert not aggsig.verify_partial(secp, sig, public_excess, public_key_sum,
public_rnd, fee, lock_height)
assert not aggsig.verify_partial(secp, sig, public_excess, public_key_sum,
public_nonce_sum, 0, lock_height)
assert not aggsig.verify_partial(secp, sig, public_excess, public_key_sum,
public_nonce_sum, fee, 0)
def select_inputs(self):
assert self.stage is None, "Incorrect stage"
assert self.role == Role.SELLER, "Incorrect role"
self.stage = Stage.INIT
if self.is_bitcoin_swap():
# Generate a key that will co-sign the BTC multisig
self.swap_cosign = SecretKey.random(self.secp)
self.public_swap_cosign = self.swap_cosign.to_public_key(self.secp)
# Inputs
self.input_entries = self.wallet.select_outputs(
self.grin_amount + tx_fee(1, 2, MILLI_GRIN_UNIT) + 1)
self.inputs = []
for entry in self.input_entries:
entry.mark_locked()
input = self.wallet.entry_to_input(entry)
self.inputs.append(input)
self.fee_amount = tx_fee(len(self.input_entries), 2, MILLI_GRIN_UNIT)
self.refund_fee_amount = tx_fee(1, 1, MILLI_GRIN_UNIT)
self.input_amount = sum(x.value for x in self.input_entries)
self.change_amount = self.input_amount - self.grin_amount - self.fee_amount
# Change output
self.change_child, self.change_entry = self.wallet.create_output(
self.change_amount)
self.change_entry.mark_locked()
self.change_output = self.wallet.entry_to_output(self.change_entry)
# Partial multisig output
self.partial_child, self.partial_entry = self.wallet.create_output(
self.grin_amount)
self.partial_entry.mark_locked()
self.partial_commit = self.wallet.commit_with_child_key(
0, self.partial_child)
# Offset
self.offset = BlindingFactor.from_secret_key(
SecretKey.random(self.secp))
# Refund output
refund_amount = self.grin_amount - self.refund_fee_amount
self.refund_child, self.refund_entry = self.wallet.create_output(
refund_amount)
self.refund_output = self.wallet.entry_to_output(self.refund_entry)
# Refund offset
self.refund_offset = BlindingFactor.from_secret_key(
SecretKey.random(self.secp))
# Nonces
self.nonce = SecretKey.random(self.secp)
self.public_nonce = self.nonce.to_public_key(self.secp)
self.refund_nonce = SecretKey.random(self.secp)
self.public_refund_nonce = self.refund_nonce.to_public_key(self.secp)
self.wallet.save()
def prepare_swap(self):
assert self.role == Role.BUYER and self.stage == Stage.LOCK, "Incorrect stage"
self.swap_nonce = SecretKey.random(self.secp)
self.public_swap_nonce = self.swap_nonce.to_public_key(self.secp)
self.swap_fee_amount = tx_fee(1, 1, MILLI_GRIN_UNIT)
self.swap_lock_height = self.lock_height + 1
self.swap_child, self.swap_entry = self.wallet.create_output(
self.grin_amount - self.swap_fee_amount)
self.wallet.save()
self.swap_offset = BlindingFactor.from_secret_key(
SecretKey.random(self.secp))
self.swap_output = self.wallet.entry_to_output(self.swap_entry)
self.fill_swap_signatures()
def multi_party_proof(n):
assert n > 1
secp = Secp256k1(None, FLAG_ALL)
mpps = []
child_keys = []
amount = randint(1, 999999)
commit_sum = [secp.commit_value(amount)]
common_nonce = SecretKey.random(secp)
for i in range(n):
child_keys.append(
ChildKey(i, Identifier.random(), Identifier.random(),
SecretKey.random(secp)))
child_key = child_keys[i]
commit_sum.append(secp.commit(0, child_key.key))
# Total commitment: sum xi*G + v*H
commitment = secp.commit_sum(commit_sum, [])
t_1s = []
t_2s = []
# Each party exports their T1 and T2
for i in range(n):
mpps.append(
MultiPartyBulletProof(secp, child_keys[i], amount, commitment,
common_nonce))
t_1, t_2 = mpps[i].round_1()
t_1s.append(t_1)
t_2s.append(t_2)
# Each party receives the other T1 and T2 values and adds it to their own
for i in range(n):
for j in range(n):
if i != j:
mpps[i].fill_round_1(t_1s[j], t_2s[j])
tau_xs = []
# Each party exports their tau_x
for i in range(n):
tau_xs.append(mpps[i].round_2())
# One party receives the other tau_x values and adds it to their own
# In this test we simulate each party calculating the proof
for i in range(n):
for j in range(n):
if i != j:
mpps[i].fill_round_2(tau_xs[j])
proofs = []
for i in range(n):
proofs.append(mpps[i].finalize())
assert secp.verify_bullet_proof(commitment, proofs[i], bytearray())
for i in range(n - 1):
assert proofs[i + 1] == proofs[0]
def post(handler: HTTPServerHandler):
global secp, wallet, server
try:
length = handler.headers['Content-Length']
length = 0 if length is None else int(length)
raw = ""
if length > 0:
raw = handler.rfile.read(length).decode()
f = open("simple_tx_receive.json", "w")
f.write(raw)
f.close()
slate = Slate.from_dict(secp, json.loads(raw))
print("Receive {} grin".format(slate.amount / GRIN_UNIT))
# Output
# n_outputs = min(100, slate.amount)
n_outputs = 1
blind_sum = BlindSum()
output_child_key, output_entry = wallet.create_output(slate.amount-n_outputs+1)
print("Generate output 0: {}".format(wallet.commit(output_entry)))
print()
blind_sum.add_child_key(output_child_key)
slate.tx.add_output(secp, wallet.entry_to_output(output_entry))
if n_outputs > 1:
for i in range(n_outputs-1):
output_child_key_loop, output_entry_loop = wallet.create_output(1)
print("Generate output {}: {}".format(i + 1, wallet.commit(output_entry_loop)))
blind_sum.add_child_key(output_child_key_loop)
slate.tx.add_output(secp, wallet.entry_to_output(output_entry_loop))
# Excess
excess = wallet.chain.blind_sum(blind_sum).to_secret_key(secp)
public_excess = excess.to_public_key(secp)
print("Generated excess")
# Nonce
nonce = SecretKey.random(secp)
public_nonce = nonce.to_public_key(secp)
# Add participant data
participant = ParticipantData(1, public_excess, public_nonce, None)
slate.add_participant(participant)
# After all participants published their nonce, calculate partial signature
slate.partial_signature(secp, participant, excess, nonce)
resp = json.dumps(slate.to_dict(secp))
wallet.save()
handler.json_response((resp + "\r\n").encode())
print("Sent response")
except Exception as e:
print("Unable to parse slate: {}".format(e))
handler.error_response()
def test_sig():
# Test Grin-like signature scheme
secp = Secp256k1(None, FLAG_ALL)
nonce_a = SecretKey.random(secp)
public_nonce_a = nonce_a.to_public_key(secp)
nonce_b = SecretKey.random(secp)
public_nonce_b = nonce_b.to_public_key(secp)
public_nonce_sum = PublicKey.from_combination(
secp, [public_nonce_a, public_nonce_b])
excess_a = SecretKey.random(secp)
public_excess_a = excess_a.to_public_key(secp)
excess_b = SecretKey.random(secp)
public_excess_b = excess_b.to_public_key(secp)
public_excess_sum = PublicKey.from_combination(
secp, [public_excess_a, public_excess_b])
fee = randint(1, 999999)
lock_height = randint(1, 999999)
# Partial signature for A
sig_a = aggsig.calculate_partial(secp, excess_a, nonce_a,
public_excess_sum, public_nonce_sum, fee,
lock_height)
assert aggsig.verify_partial(secp, sig_a, public_excess_a,
public_excess_sum, public_nonce_sum, fee,
lock_height)
# Partial signature for B
sig_b = aggsig.calculate_partial(secp, excess_b, nonce_b,
public_excess_sum, public_nonce_sum, fee,
lock_height)
assert aggsig.verify_partial(secp, sig_b, public_excess_b,
public_excess_sum, public_nonce_sum, fee,
lock_height)
# Total signature
sig = aggsig.add_partials(secp, [sig_a, sig_b], public_nonce_sum)
assert aggsig.verify(secp, sig, public_excess_sum, fee, lock_height)
rnd_sig = Signature(bytearray(urandom(64)))
assert not aggsig.verify(secp, rnd_sig, public_excess_sum, fee,
lock_height)
public_rnd = SecretKey.random(secp).to_public_key(secp)
assert not aggsig.verify(secp, sig, public_rnd, fee, lock_height)
assert not aggsig.verify(secp, sig, public_excess_sum, 0, lock_height)
assert not aggsig.verify(secp, sig, public_excess_sum, fee, 0)
def test_proofs(create=False):
secp = Secp256k1(None, FLAG_ALL)
if create:
dct = []
for i in range(100):
secret = SecretKey.random(secp)
nonce = SecretKey.random(secp)
amount = randint(1, 10000000000)
proof = secp.bullet_proof(amount, secret, nonce, bytearray())
dct.append({
"secret": secret.to_hex().decode(),
"nonce": nonce.to_hex().decode(),
"amount": amount,
"proof": proof.to_hex().decode()
})
f = open("proofs_new.json", "w")
f.write(json.dumps(dct, indent=2))
f.close()
return
f = open("tests/proofs.json", "r")
dct = json.loads(f.read())
f.close()
test_count = 0
test_equal_count = 0
for test in dct:
test_count += 1
secret = SecretKey.from_hex(secp, test['secret'].encode())
nonce = SecretKey.from_hex(secp, test['nonce'].encode())
amount = test['amount']
proof_target = RangeProof.from_hex(test['proof'].encode())
proof = secp.bullet_proof(amount, secret, nonce, bytearray())
commit = secp.commit(amount, secret)
assert secp.verify_bullet_proof(
commit, proof,
bytearray()), "Proof {} fails to verify".format(test_count)
if proof == proof_target:
test_equal_count += 1
assert test_count == test_equal_count, \
"All proofs verify, but only {} out of {} proofs are the same".format(test_equal_count, test_count)
def build_transactions(self):
assert self.role == Role.SELLER and self.stage == Stage.LOCK, "Incorrect stage"
# Check output range proof
output = Output(OutputFeatures.DEFAULT_OUTPUT, self.commit,
self.range_proof)
assert output.verify(self.secp), "Invalid bulletproof"
# Build refund tx
refund_input = Input(OutputFeatures.DEFAULT_OUTPUT, self.commit)
public_refund_nonce_sum = PublicKey.from_combination(
self.secp,
[self.public_refund_nonce, self.foreign_public_refund_nonce])
refund_signature = aggsig.add_partials(self.secp, [
self.partial_refund_signature,
self.foreign_partial_refund_signature
], public_refund_nonce_sum)
assert aggsig.verify(
self.secp, refund_signature, self.public_refund_excess,
self.refund_fee_amount,
self.refund_lock_height), "Unable to verify refund signature"
refund_kernel = Kernel(0, self.refund_fee_amount,
self.refund_lock_height, None, None)
self.refund_tx = Transaction([refund_input], [self.refund_output],
[refund_kernel], self.refund_offset)
refund_kernel.excess = self.refund_tx.sum_commitments(self.secp)
refund_kernel.excess_signature = refund_signature
assert self.refund_tx.verify_kernels(
self.secp), "Unable to verify refund kernel"
# Build multisig tx
public_nonce_sum = PublicKey.from_combination(
self.secp, [self.public_nonce, self.foreign_public_nonce])
signature = aggsig.add_partials(
self.secp,
[self.partial_signature, self.foreign_partial_signature],
public_nonce_sum)
assert aggsig.verify(self.secp, signature, self.public_excess, self.fee_amount, self.lock_height), \
"Unable to verify signature"
kernel = Kernel(0, self.fee_amount, self.lock_height, None, None)
self.tx = Transaction(self.inputs, [self.change_output, output],
[kernel], self.offset)
kernel.excess = self.tx.sum_commitments(self.secp)
kernel.excess_signature = signature
assert self.tx.verify_kernels(self.secp), "Unable to verify kernel"
self.swap_nonce = SecretKey.random(self.secp)
self.public_swap_nonce = self.swap_nonce.to_public_key(self.secp)
def receive(self, dct: dict):
if self.stage is None:
if self.role == Role.BUYER:
dct['time_start'] = int(time())
self.wallet = Wallet.open(self.secp, dct['wallet'])
# Add 'foreign_' prefix to some keys
dct.update({
"foreign_partial_commit":
dct['partial_commit'],
"foreign_public_nonce":
dct['public_nonce'],
"foreign_public_refund_nonce":
dct['public_refund_nonce']
})
dct.pop("partial_commit", None)
dct.pop("public_nonce", None)
dct.pop("public_refund_nonce", None)
# Partial multisig output
self.partial_child, self.partial_entry = self.wallet.create_output(
dct['grin_amount'])
self.partial_entry.mark_locked()
self.nonce = SecretKey.random(self.secp)
self.refund_nonce = SecretKey.random(self.secp)
self.secret_lock = SecretKey.random(self.secp)
self.public_lock = self.secret_lock.to_public_key(self.secp)
if dct['swap_currency'] == "BTC":
self.btc_lock_time = int(time() + 24 * 60 * 60)
self.btc_refund_key = SecretKey.random(self.secp)
self.public_btc_refund_key = self.btc_refund_key.to_public_key(
self.secp)
self.load(dct)
if self.is_bitcoin_swap():
self.btc_lock_address = self.calculate_btc_lock_address()
self.wallet.save()
else:
raise Exception("This stage doesn't expect an input file")
elif self.stage == Stage.INIT:
self.stage = Stage.SIGN
self.foreign_t_1 = PublicKey.from_hex(self.secp,
dct['t_1'].encode())
self.foreign_t_2 = PublicKey.from_hex(self.secp,
dct['t_2'].encode())
if self.role == Role.SELLER:
self.foreign_partial_commit = Commitment.from_hex(
self.secp, dct['partial_commit'].encode())
self.foreign_public_nonce = PublicKey.from_hex(
self.secp, dct['public_nonce'].encode())
self.foreign_public_refund_nonce = PublicKey.from_hex(
self.secp, dct['public_refund_nonce'].encode())
self.public_lock = PublicKey.from_hex(
self.secp, dct['public_lock'].encode())
if self.is_bitcoin_swap():
self.btc_lock_time = int(dct['btc_lock_time'])
self.public_btc_refund_key = PublicKey.from_hex(
self.secp, dct['public_btc_refund_key'])
self.btc_lock_address = self.calculate_btc_lock_address()
if self.is_ether_swap():
self.eth_address_lock = ethereum_address(
self.secp, self.public_lock).decode()
self.eth_contract_address = dct['eth_contract_address']
self.commit = self.secp.commit_sum([
self.foreign_partial_commit,
self.wallet.commit(self.partial_entry)
], [])
self.foreign_partial_signature = Signature.from_hex(
dct['partial_signature'].encode())
self.foreign_partial_refund_signature = Signature.from_hex(
dct['partial_refund_signature'].encode())
else:
self.foreign_tau_x = SecretKey.from_hex(
self.secp, dct['tau_x'].encode())
elif self.stage == Stage.SIGN:
self.stage = Stage.LOCK
if self.role == Role.SELLER:
self.range_proof = RangeProof.from_hex(
dct['range_proof'].encode())
else:
self.tx_height = dct['tx_height']
self.foreign_public_swap_nonce = PublicKey.from_hex(
self.secp, dct['public_swap_nonce'].encode())
elif self.stage == Stage.LOCK:
self.stage = Stage.SWAP
if self.role == Role.SELLER:
self.foreign_public_swap_nonce = PublicKey.from_hex(
self.secp, dct['public_swap_nonce'].encode())
self.swap_fee_amount = int(dct['swap_fee_amount'])
self.swap_lock_height = int(dct['swap_lock_height'])
self.swap_output = Output.from_dict(self.secp,
dct['swap_output'], True)
self.swap_offset = BlindingFactor.from_hex(
dct['swap_offset'].encode())
self.foreign_partial_swap_adaptor = Signature.from_hex(
dct['partial_swap_adaptor'])
else:
self.foreign_partial_swap_signature = Signature.from_hex(
dct['partial_swap_signature'])
elif self.stage == Stage.SWAP:
self.stage = Stage.DONE
if self.role == Role.SELLER:
self.foreign_partial_swap_signature = Signature.from_hex(
dct['partial_swap_signature'])
else:
raise Exception("Invalid stage")
def test_secret_key():
secp = Secp256k1(None, FLAG_ALL)
# (de)serialization
key_a = SecretKey.random(secp)
key_b = SecretKey.from_bytearray(secp, key_a.to_bytearray())
assert key_a == key_b
# Too short
with raises(Exception):
SecretKey.from_bytearray(secp,
bytearray([0x01] * (SECRET_KEY_SIZE - 1)))
# Too long
with raises(Exception):
SecretKey.from_bytearray(secp,
bytearray([0x01] * (SECRET_KEY_SIZE + 1)))
# Zero
with raises(Exception):
SecretKey.from_bytearray(secp, bytearray([0] * SECRET_KEY_SIZE))
# Overflow
with raises(Exception):
SecretKey.from_bytearray(secp, bytearray([0xFF] * SECRET_KEY_SIZE))
# Top of range
SecretKey.from_bytearray(
secp,
bytearray([
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xBA, 0xAE, 0xDC, 0xE6, 0xAF, 0x48,
0xA0, 0x3B, 0xBF, 0xD2, 0x5E, 0x8C, 0xD0, 0x36, 0x41, 0x40
]))
# One past top of range
with raises(Exception):
SecretKey.from_bytearray(
secp,
bytearray([
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xBA, 0xAE, 0xDC, 0xE6,
0xAF, 0x48, 0xA0, 0x3B, 0xBF, 0xD2, 0x5E, 0x8C, 0xD0, 0x36,
0x41, 0x41
]))
# a=a
key_a = SecretKey.from_bytearray(secp, bytearray([0xCB] * SECRET_KEY_SIZE))
key_b = SecretKey.from_bytearray(secp, bytearray([0xCB] * SECRET_KEY_SIZE))
assert key_a == key_b
# a!=b
key_b = SecretKey.from_bytearray(secp, bytearray([0xCC] * SECRET_KEY_SIZE))
assert key_a != key_b
# a+b
key_a = SecretKey.from_bytearray(secp, bytearray([0xDD] * SECRET_KEY_SIZE))
key_b = SecretKey.from_bytearray(secp, bytearray([0x02] * SECRET_KEY_SIZE))
key_a.add_assign(secp, key_b)
key_c = SecretKey.from_bytearray(secp, bytearray([0xDF] * SECRET_KEY_SIZE))
assert key_a == key_c
# a+b = b+a
key_a = SecretKey.random(secp)
key_b = SecretKey.random(secp)
key_a_b = key_a.add(secp, key_b)
key_b_a = key_b.add(secp, key_a)
assert key_a_b == key_b_a
# Key addition where sum > order (N-1+N-2=N-3)
key_a = SecretKey.from_bytearray(
secp,
bytearray([
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xBA, 0xAE, 0xDC, 0xE6, 0xAF, 0x48,
0xA0, 0x3B, 0xBF, 0xD2, 0x5E, 0x8C, 0xD0, 0x36, 0x41, 0x40
]))
key_b = SecretKey.from_bytearray(
secp,
bytearray([
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xBA, 0xAE, 0xDC, 0xE6, 0xAF, 0x48,
0xA0, 0x3B, 0xBF, 0xD2, 0x5E, 0x8C, 0xD0, 0x36, 0x41, 0x3F
]))
key_a.add_assign(secp, key_b)
key_c = SecretKey.from_bytearray(
secp,
bytearray([
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xBA, 0xAE, 0xDC, 0xE6, 0xAF, 0x48,
0xA0, 0x3B, 0xBF, 0xD2, 0x5E, 0x8C, 0xD0, 0x36, 0x41, 0x3E
]))
assert key_a == key_c
# ab = ba
key_a = SecretKey.random(secp)
key_b = SecretKey.random(secp)
key_ab = key_a.mul(secp, key_b)
key_ba = key_b.mul(secp, key_a)
assert key_ab == key_ba
# c(a+b) = ca + cb
key_a = SecretKey.random(secp)
key_b = SecretKey.random(secp)
key_c = SecretKey.random(secp)
key_ca = key_a.mul(secp, key_c)
key_cb = key_b.mul(secp, key_c)
key_ca_b = key_a.add(secp, key_b)
key_ca_b.mul_assign(secp, key_c)
key_ca_cb = key_ca.add(secp, key_cb)
assert key_ca_b == key_ca_cb
def test_public_key():
secp = Secp256k1(None, FLAG_ALL)
# (de)serialization
secret_key = SecretKey.random(secp)
public_key = secret_key.to_public_key(secp)
public_key_2 = PublicKey.from_bytearray(secp,
public_key.to_bytearray(secp))
assert public_key == public_key_2
# (a+b)*G = a*G + b*G
secret_key_a = SecretKey.random(secp)
secret_key_b = SecretKey.random(secp)
secret_key_a_b = secret_key_a.add(secp, secret_key_b)
public_key_a = secret_key_a.to_public_key(secp)
public_key_b = secret_key_b.to_public_key(secp)
public_key_a_b = secret_key_a_b.to_public_key(secp)
public_key_a_b_2 = PublicKey.from_combination(secp,
[public_key_a, public_key_b])
public_key_a_b_3 = public_key_a.add_scalar(secp, secret_key_b)
assert public_key_a_b == public_key_a_b_2
assert public_key_a_b == public_key_a_b_3
# (ab)*G = a(b*G) = b(a*G)
secret_key_a = SecretKey.random(secp)
secret_key_b = SecretKey.random(secp)
secret_key_ab = secret_key_a.mul(secp, secret_key_b)
public_key_ab = secret_key_ab.to_public_key(secp)
public_key_ab_2 = secret_key_a.to_public_key(secp)
public_key_ab_2.mul_assign(secp, secret_key_b)
public_key_ab_3 = secret_key_b.to_public_key(secp)
public_key_ab_3.mul_assign(secp, secret_key_a)
assert public_key_ab == public_key_ab_2
assert public_key_ab == public_key_ab_3
# (c(a+b))*G = c(a*G) + c(b*G)
secret_key_a = SecretKey.random(secp)
secret_key_b = SecretKey.random(secp)
secret_key_c = SecretKey.random(secp)
secret_key_ca_b = secret_key_a.add(secp, secret_key_b)
secret_key_ca_b.mul_assign(secp, secret_key_c)
public_key_ca_b = secret_key_ca_b.to_public_key(secp)
public_key_ca = secret_key_a.to_public_key(secp)
public_key_ca.mul_assign(secp, secret_key_c)
public_key_cb = secret_key_b.to_public_key(secp)
public_key_cb.mul_assign(secp, secret_key_c)
public_key_ca_cb = public_key_ca.add(secp, public_key_cb)
assert public_key_ca_b == public_key_ca_cb
# (a+b+c)*G = a*G + b*G + c*G
secret_key_a = SecretKey.random(secp)
secret_key_b = SecretKey.random(secp)
secret_key_c = SecretKey.random(secp)
secret_key_a_b_c = secret_key_a.add(secp, secret_key_b)
secret_key_a_b_c.add_assign(secp, secret_key_c)
public_key_a_b_c = secret_key_a_b_c.to_public_key(secp)
public_key_a = secret_key_a.to_public_key(secp)
public_key_b = secret_key_b.to_public_key(secp)
public_key_c = secret_key_c.to_public_key(secp)
public_key_a_b_c_2 = PublicKey.from_combination(
secp, [public_key_a, public_key_b, public_key_c])
assert public_key_a_b_c == public_key_a_b_c_2
def send(node_url: str):
global secp, wallet
send_amount = 1
height = 33333
lock_height = 33333
features = 0
dest_url = "http://127.0.0.1:17175"
fluff = True
n_outputs = 2
secp = Secp256k1(None, FLAG_ALL)
wallet = Wallet.open(secp, "wallet_1")
print("Preparing to send {} grin to {}".format(send_amount / GRIN_UNIT, dest_url))
input_entries = wallet.select_outputs(send_amount + tx_fee(1, n_outputs, MILLI_GRIN_UNIT))
fee_amount = tx_fee(len(input_entries), n_outputs, MILLI_GRIN_UNIT)
input_amount = sum(x.value for x in input_entries)
change_amount = input_amount - send_amount - fee_amount
print("Selected {} inputs".format(len(input_entries)))
blind_sum = BlindSum()
slate = Slate.blank(secp, 2, send_amount, height, features, fee_amount, lock_height)
# Inputs
for entry in input_entries:
entry.mark_locked()
blind_sum.sub_child_key(wallet.derive_from_entry(entry))
slate.tx.add_input(secp, wallet.entry_to_input(entry))
# Change output
change_key, change_entry = wallet.create_output(change_amount)
blind_sum.add_child_key(change_key)
slate.tx.add_output(secp, wallet.entry_to_output(change_entry))
# Excess
blind_sum.sub_blinding_factor(slate.tx.offset)
excess = wallet.chain.blind_sum(blind_sum).to_secret_key(secp)
public_excess = excess.to_public_key(secp)
# Nonce
nonce = SecretKey.random(secp)
public_nonce = nonce.to_public_key(secp)
# Participant
participant = ParticipantData(0, public_excess, public_nonce, None)
slate.add_participant(participant)
print("Sending slate to receiver..")
req = urlopen(dest_url, json.dumps(slate.to_dict(secp)).encode(), 600)
slate = Slate.from_dict(secp, json.loads(req.read().decode()))
print("Received response, finishing transaction..")
participant = slate.get_participant(0)
slate.partial_signature(secp, participant, excess, nonce)
slate.finalize(secp)
tx_wrapper = {
"tx_hex": slate.tx.to_hex(secp).decode()
}
print("Submitting to node..")
urlopen("{}/v1/pool/push".format(node_url) + ("?fluff" if fluff else ""), json.dumps(tx_wrapper).encode(), 600)
wallet.save()
print("Transaction complete!")
def empty(secp: Secp256k1, features: int, fee: int, lock_height: int):
kernel = Kernel(features, fee, lock_height, None, None)
return Transaction([], [], [kernel],
BlindingFactor.from_secret_key(
SecretKey.random(secp)))