/**
* @param BufferInterface $hash
* @param int|string $nBits
* @return bool
*/
public function check(BufferInterface $hash, $nBits)
{
$negative = false;
$overflow = false;
$target = $this->math->writeCompact($nBits, $negative, $overflow);
if ($negative || $overflow || $this->math->cmp($target, 0) === 0 || $this->math->cmp($target, $this->getMaxTarget()) > 0) {
throw new \RuntimeException('nBits below minimum work');
}
if ($this->math->cmp($hash->getInt(), $target) > 0) {
throw new \RuntimeException("Hash doesn't match nBits");
}
return true;
}
/**
* Encode a given hex string in base58
*
* @param BufferInterface $binary
* @return string
* @throws \Exception
*/
public static function encode(BufferInterface $binary)
{
$size = $binary->getSize();
if ($binary->getBinary() === '') {
return '';
}
$math = Bitcoin::getMath();
$orig = $binary->getBinary();
$decimal = $binary->getInt();
$return = '';
while ($math->cmp($decimal, 0) > 0) {
list($decimal, $rem) = $math->divQr($decimal, 58);
$return .= self::$base58chars[$rem];
}
$return = strrev($return);
//leading zeros
for ($i = 0; $i < $size && $orig[$i] === ""; $i++) {
$return = '1' . $return;
}
return $return;
}
/**
* @param BufferInterface $privateKey
* @return bool
*/
public function validatePrivateKey(BufferInterface $privateKey)
{
$math = $this->math;
$scalar = $privateKey->getInt();
return $math->cmp($scalar, 0) > 0 && $math->cmp($scalar, $this->getGenerator()->getOrder()) < 0;
}
