def create_memo_script(prefix, content):
''' prefix (int): action code
content (list of str) '''
prefix_bytes = prefix.to_bytes(2, 'big')
if prefix in (MEMO_SET_PROFILE_NAME, MEMO_POST, MEMO_SET_PROFILE_TEXT,
MEMO_SET_PROFILE_PICTURE, MEMO_POST_IN_TOPIC,
MEMO_FOLLOW_TOPIC, MEMO_UNFOLLOW_TOPIC):
return (bytes([OP_RETURN]) + push_data(prefix_bytes) +
bytes().join(push_data(d.encode('utf-8')) for d in content))
elif prefix in (MEMO_REPLY, MEMO_LIKE_AND_TIP, MEMO_ADD_POLL_OPTION,
MEMO_VOTE_IN_POLL):
return (
bytes([OP_RETURN]) + push_data(prefix_bytes) +
push_data(bytes.fromhex(content[0])[::-1]) +
bytes().join(push_data(d.encode('utf-8')) for d in content[1:]))
elif prefix in (MEMO_FOLLOW_USER, MEMO_UNFOLLOW_USER, MEMO_SEND_MONEY):
return (
bytes([OP_RETURN]) + push_data(prefix_bytes) +
push_data(bytes.fromhex(content[0])) +
bytes().join(push_data(d.encode('utf-8')) for d in content[1:]))
elif prefix == MEMO_CREATE_POLL:
poll_type = op_number(content[0])
option_count = op_number(content[1])
return (
bytes([OP_RETURN]) + push_data(prefix_bytes) +
bytes([poll_type, option_count]) +
bytes().join(push_data(d.encode('utf-8')) for d in content[2:]))
else:
raise NullDataError("cannot serialize memo script")
def multisig_locking_script(pubkeys, m):
''' Returns m-of-n multisig locking script (also called redeem script). '''
n = len(pubkeys)
if not 1 <= m <= n <= 3:
raise ScriptError('{:d}-of-{:d} multisig script not possible'.format(
m, n))
OP_m = op_number(m)
OP_n = op_number(n)
serpubkeys = bytes().join(push_data(pubkey.to_ser()) for pubkey in pubkeys)
return (bytes([OP_m]) + serpubkeys + bytes([OP_n, OP_CHECKMULTISIG]))
def simple_addition_unlocking_script(nsum, n2, n1):
assert (n1 + n2 == nsum)
return bytes([op_number(n1)])
def simple_addition_locking_script(nsum, n2, n1=-1):
''' Simple addition locking script. '''
assert (n1 + n2 == nsum) | (n1 == -1)
return bytes([op_number(n2), OP_ADD, op_number(nsum), OP_EQUAL])
raise ScriptError("cannot parse locking script")
if __name__ == '__main__':
import sys
if sys.version_info < (3, 5):
sys.exit("Error: Must be using Python 3.5 or higher")
print("SHA-1 collision bounty")
script = bytes([
OP_2DUP, OP_EQUAL, OP_NOT, OP_VERIFY, OP_SHA1, OP_SWAP, OP_SHA1,
OP_EQUAL
])
address = Address.from_script(script)
print("script", script.hex())
print("address", address.to_legacy())
script = bytes([op_number(3), OP_ADD, op_number(5), OP_EQUAL])
address = Address.from_script(script)
print("script", script.hex())
print("address", address.to_legacy())
print("hash", address.h.hex())
#
# P2MS address
script = "5121032df7cde5c76b9d8dc36317c74952cc3fdc6d0afb30580ea3b63394497469d47a51ae"
address = "m-" + sha256(script.encode('utf-8'))[:16].hex()
print("script", script)
print("P2MS address", address)