def __init__(self, pubkey=None, raw=False, flags=FLAG_VERIFY, ctx=None):
Base.__init__(self, ctx, flags)
if pubkey is not None:
if raw:
if not isinstance(pubkey, bytes):
raise TypeError('raw pubkey must be bytes')
self.public_key = self.deserialize(pubkey)
else:
if not isinstance(pubkey, ffi.CData):
raise TypeError('pubkey must be an internal object')
assert ffi.typeof(pubkey) is ffi.typeof('secp256k1_pubkey *')
self.public_key = pubkey
else:
self.public_key = None
def combine(self, pubkeys):
"""Add a number of public keys together."""
assert len(pubkeys) > 0
outpub = ffi.new('secp256k1_pubkey *')
for item in pubkeys:
assert ffi.typeof(item) is ffi.typeof('secp256k1_pubkey *')
res = lib.secp256k1_ec_pubkey_combine(
self.ctx, outpub, pubkeys, len(pubkeys))
if not res:
raise Exception('failed to combine public keys')
self.public_key = outpub
return outpub