public static generateRandom ( $bytes = 32 ) : string | ||
return | string |
/** * Creates an ECDSA signature of $data. * * @param string * @return string * @throws \Exception */ public function sign($data) { if (!ctype_xdigit($this->hex)) { throw new \Exception('The private key must be in hex format.'); } if (empty($data)) { throw new \Exception('You did not provide any data to sign.'); } $e = Util::decodeHex(hash('sha256', $data)); do { if (substr(strtolower($this->hex), 0, 2) != '0x') { $d = '0x' . $this->hex; } else { $d = $this->hex; } $k = SecureRandom::generateRandom(32); $k_hex = '0x' . strtolower(bin2hex($k)); $n_hex = '0x' . Secp256k1::N; $Gx = '0x' . substr(Secp256k1::G, 2, 64); $Gy = '0x' . substr(Secp256k1::G, 66, 64); $P = new Point($Gx, $Gy); // Calculate a new curve point from Q=k*G (x1,y1) $R = Util::doubleAndAdd($k_hex, $P); $Rx_hex = Util::encodeHex($R->getX()); $Rx_hex = str_pad($Rx_hex, 64, '0', STR_PAD_LEFT); // r = x1 mod n $r = Math::mod('0x' . $Rx_hex, $n_hex); // s = k^-1 * (e+d*r) mod n $edr = Math::add($e, Math::mul($d, $r)); $invk = Math::invertm($k_hex, $n_hex); $kedr = Math::mul($invk, $edr); $s = Math::mod($kedr, $n_hex); // The signature is the pair (r,s) $signature = array('r' => Util::encodeHex($r), 's' => Util::encodeHex($s)); $signature['r'] = str_pad($signature['r'], 64, '0', STR_PAD_LEFT); $signature['s'] = str_pad($signature['s'], 64, '0', STR_PAD_LEFT); } while (Math::cmp($r, '0') <= 0 || Math::cmp($s, '0') <= 0); $sig = array('sig_rs' => $signature, 'sig_hex' => self::serializeSig($signature['r'], $signature['s'])); return $sig['sig_hex']['seq']; }