def serialize_xpub(k):
b = b''
b += HD_HEADER_PUBLIC
b += convert.int_to_byte(k['depth'])
b += k['fingerprint']
b += convert.int_to_bytes(k['i'], 4)
b += k['chaincode']
b += ecdsa.serialize_pub(k['pub'])
return convert.bytes_to_b58check(b)
def serialize_xpriv(k):
b = b''
b += HD_HEADER_PRIVATE
b += convert.int_to_byte(k['depth'])
b += k['fingerprint']
b += convert.int_to_bytes(k['i'], 4)
b += k['chaincode']
b += b'\x00' + ecdsa.serialize_priv(k['priv'])
return convert.bytes_to_b58check(b)
def sign_p2pk(tx, i, priv, pub, hashtype = SIGHASH_ALL):
assert isinstance(tx, dict)
i = int(i)
assert isinstance(priv, int)
assert isinstance(pub, bytes)
prev_script = script.make_p2pk(pub)
txhash = sighash(tx, i, prev_script, hashtype)
sig = ecdsa.sign(txhash, priv)
sig = ecdsa.serialize_sig(sig) + convert.int_to_byte(hashtype)
tx["ins"][i]["script"] = script.serialize([sig])
def sign_multisig(tx, i, prev_script, privs, pubs, hashtype = SIGHASH_ALL):
assert isinstance(tx, dict)
i = int(i)
assert len(privs) == len(pubs)
txhash = sighash(tx, i, prev_script, hashtype)
s = [
script.Opcode.OP_0,
]
for j in range(len(privs)):
priv = privs[j]
pub = pubs[j]
sig = ecdsa.sign(txhash, priv)
sig = ecdsa.serialize_sig(sig) + convert.int_to_byte(hashtype)
s.append(sig)
tx["ins"][i]["script"] = script.serialize(s)
def serialize_unit(unit):
if isinstance(unit, Opcode):
return convert.int_to_byte(unit.value)
if isinstance(unit, bytes):
if len(unit) <= 75:
return convert.int_to_byte(len(unit)) + unit
elif len(unit) < 256:
return convert.int_to_byte(76) + convert.int_to_byte(len(unit))+unit
elif len(unit) < 65536:
return convert.int_to_byte(77) + convert.int_to_bytes_le(len(unit), 2) + unit
else:
return convert.int_to_byte(78) + convert.int_to_bytes_le(len(unit), 4) + unit
raise Exception('Bad script unit type')
def encode_var_int(x):
x = int(x)
if x < 253: return convert.int_to_byte(x)
elif x < 65536: return convert.int_to_byte(253) + convert.int_to_bytes_le(x, 2)
elif x < 4294967296: return convert.int_to_byte(254) + convert.int_to_bytes_le(x, 4)
else: return convert.int_to_byte(255) + convert.int_to_bytes_le(x, 8)
def serialize_pub(pub, compressed=True):
if compressed:
return convert.int_to_byte(2 + (pub[1] % 2)) + convert.int_to_bytes(pub[0], 32)
else:
return b"\x04" + convert.int_to_bytes(pub[0], 32) + convert.int_to_bytes(pub[1], 32)
def serialize_sig(sig):
_, r, s = sig
b1, b2 = int_to_bytes_var_length(r), int_to_bytes_var_length(s)
left = b"\x02" + convert.int_to_byte(len(b1)) + b1
right = b"\x02" + convert.int_to_byte(len(b2)) + b2
return b"\x30" + convert.int_to_byte(len(left + right)) + left + right
