Bitpay\PublicKey::generate PHP Метод

    public function generate(PrivateKey $privateKey = null)
    {
        if ($privateKey instanceof PrivateKey) {
            $this->setPrivateKey($privateKey);
        }
        if (!empty($this->hex)) {
            return $this;
        }
        if (is_null($this->privateKey)) {
            throw new \Exception('Please `setPrivateKey` before you generate a public key');
        }
        if (!$this->privateKey->isGenerated()) {
            $this->privateKey->generate();
        }
        if (!$this->privateKey->isValid()) {
            throw new \Exception('Private Key is invalid and cannot be used to generate a public key');
        }
        $point = new Point('0x' . substr(Secp256k1::G, 2, 64), '0x' . substr(Secp256k1::G, 66, 64));
        $R = Util::doubleAndAdd('0x' . $this->privateKey->getHex(), $point);
        $RxHex = Util::encodeHex($R->getX());
        $RyHex = Util::encodeHex($R->getY());
        $RxHex = str_pad($RxHex, 64, '0', STR_PAD_LEFT);
        $RyHex = str_pad($RyHex, 64, '0', STR_PAD_LEFT);
        $this->x = $RxHex;
        $this->y = $RyHex;
        $this->hex = sprintf('%s%s', $RxHex, $RyHex);
        $this->dec = Util::decodeHex($this->hex);
        return $this;
    }

 /**
  * @return PublicKey
  */
 public function getPublicKey()
 {
     if (null === $this->publicKey) {
         $this->publicKey = new PublicKey();
         $this->publicKey->setPrivateKey($this);
         $this->publicKey->generate();
     }
     return $this->publicKey;
 }