/**
* @param int $tweak
* @return PrivateKey
*/
public function tweakMul($tweak)
{
$adapter = $this->ecAdapter;
$math = $adapter->getMath();
$context = $adapter->getContext();
$privateKey = $this->getBinary();
// mod by reference
$tweak = Buffer::int($tweak, 32, $math)->getBinary();
$ret = \secp256k1_ec_privkey_tweak_mul($context, $privateKey, $tweak);
if ($ret !== 1) {
throw new \RuntimeException('Secp256k1 privkey tweak mul: failed');
}
$secret = $math->hexDec(bin2hex($privateKey));
return $adapter->getPrivateKey($secret, $this->compressed);
}
/**
* @expectedException \Exception
*/
public function testEnforceZvalString()
{
$tweak = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
$privateKey = array();
\secp256k1_ec_privkey_tweak_mul(TestCase::getContext(), $privateKey, $tweak);
}
/**
* @param PrivateKeyInterface $privateKey
* @param int|string $integer
* @return \BitWasp\Bitcoin\Key\PrivateKey
* @throws \Exception
*/
public function privateKeyMul(PrivateKeyInterface $privateKey, $integer)
{
$privKey = $privateKey->getBuffer()->getBinary();
// mod by reference
$ret = (bool) \secp256k1_ec_privkey_tweak_mul($privKey, $this->getBinaryScalar($integer));
if ($ret === false) {
throw new \Exception('Secp256k1 privkey tweak mul: failed');
}
return $this->getRelatedPrivateKey($privateKey, $privKey);
}
