def derive_child(self, i):
high_bit = i & PUBLIC_DERIVATION_BIT
if high_bit:
I = hmac_sha512(self.chain_code, '\x00' + encode_bigint(self.key) + struct.pack('>L', i)).digest()
else:
I = hmac_sha512(self.chain_code, encode_pub_compressed(priv_to_pub(self.key)) + struct.pack('>L', i)).digest()
IL = decode_bigint(I[:32])
if IL >= secp256k1.order:
raise Error('invalid key')
IR = I[32:]
ki = (IL + self.key) % secp256k1.order
if ki == 0:
raise Error('invalid key')
ci = IR
return HDPrivKey(ki, ci, self.depth + 1, i, self.fingerprint(), self.V_T[self.version])
def derive_child(self, i):
high_bit = i & PUBLIC_DERIVATION_BIT
if high_bit:
I = hmac_sha512(
self.chain_code, '\x00' + encode_bigint(self.key) +
struct.pack('>L', i)).digest()
else:
I = hmac_sha512(
self.chain_code,
encode_pub_compressed(priv_to_pub(self.key)) +
struct.pack('>L', i)).digest()
IL = decode_bigint(I[:32])
if IL >= secp256k1.order:
raise Error('invalid key')
IR = I[32:]
ki = (IL + self.key) % secp256k1.order
if ki == 0:
raise Error('invalid key')
ci = IR
return HDPrivKey(ki, ci, self.depth + 1, i, self.fingerprint(),
self.V_T[self.version])
def serialized_key(self):
return '\x00' + encode_bigint(self.key)
def serialized_key(self):
return '\x00' + encode_bigint(self.key)
