def add(self, scalar: bytes, update: bool = False):
"""
Add a scalar to the public key.
:param scalar: The scalar with which to add.
:param update: Whether or not to update and return the public key in-place.
:return: The new public key, or the modified public key if `update` is `True`.
:rtype: PublicKey
:raises ValueError: If the tweak was out of range or the resulting public key was invalid.
"""
scalar = pad_scalar(scalar)
new_key = ffi.new('secp256k1_pubkey *', self.public_key[0])
success = lib.secp256k1_ec_pubkey_tweak_add(self.context.ctx, new_key,
scalar)
if not success:
raise ValueError(
'The tweak was out of range, or the resulting public key is invalid.'
)
if update:
self.public_key = new_key
return self
return PublicKey(new_key, self.context)
def add(self, scalar: bytes, update: bool = False):
"""
Add a scalar to the private key.
:param scalar: The scalar with which to add.
:param update: Whether or not to update and return the private key in-place.
:return: The new private key, or the modified private key if `update` is `True`.
:rtype: PrivateKey
:raises ValueError: If the tweak was out of range or the resulting private key was invalid.
"""
scalar = pad_scalar(scalar)
secret = ffi.new('unsigned char [32]', self.secret)
success = lib.secp256k1_ec_privkey_tweak_add(self.context.ctx, secret,
scalar)
if not success:
raise ValueError(
'The tweak was out of range, or the resulting private key is invalid.'
)
secret = bytes(ffi.buffer(secret, 32))
if update:
self.secret = secret
self._update_public_key()
return self
return PrivateKey(secret, self.context)
def add(self, scalar, update=False):
scalar = pad_scalar(scalar)
new_key = ffi.new('secp256k1_pubkey *', self.public_key[0])
success = lib.secp256k1_ec_pubkey_tweak_add(self.context.ctx, new_key, scalar)
if not success:
raise ValueError('The tweak was out of range, or the resulting public key is invalid.')
if update:
self.public_key = new_key
return self
return PublicKey(new_key, self.context)
def add(self, scalar, update=False):
scalar = pad_scalar(scalar)
secret = ffi.new('unsigned char [32]', self.secret)
success = lib.secp256k1_ec_privkey_tweak_add(self.context.ctx, secret, scalar)
if not success:
raise ValueError('The tweak was out of range, or the resulting private key is invalid.')
secret = bytes(ffi.buffer(secret, 32))
if update:
self.secret = secret
self._update_public_key()
return self
return PrivateKey(secret, self.context)
def test_bytes_int_conversion():
bytestr = b'\x00' + urandom(31)
assert pad_scalar(int_to_bytes(bytes_to_int(bytestr))) == bytestr
def test_empty_scalar(self):
assert len(pad_scalar(b'')) == 32
def test_pad_limit(self):
n = urandom(32)
assert len(pad_scalar(n)) == len(n)
def test_correct(self):
assert pad_scalar(b'\x01') == b'\x00' * 31 + b'\x01'
