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Direktori : /home2/selectio/www/3-idiots/vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/ |
Current File : //home2/selectio/www/3-idiots/vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PrivateKey.php |
<?php /** * DSA Private Key * * @author Jim Wigginton <terrafrost@php.net> * @copyright 2015 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib3\Crypt\DSA; use phpseclib3\Crypt\Common; use phpseclib3\Crypt\DSA; use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature; use phpseclib3\Math\BigInteger; /** * DSA Private Key * * @author Jim Wigginton <terrafrost@php.net> */ final class PrivateKey extends DSA implements Common\PrivateKey { use Common\Traits\PasswordProtected; /** * DSA secret exponent x * * @var \phpseclib3\Math\BigInteger */ protected $x; /** * Returns the public key * * If you do "openssl rsa -in private.rsa -pubout -outform PEM" you get a PKCS8 formatted key * that contains a publicKeyAlgorithm AlgorithmIdentifier and a publicKey BIT STRING. * An AlgorithmIdentifier contains an OID and a parameters field. With RSA public keys this * parameters field is NULL. With DSA PKCS8 public keys it is not - it contains the p, q and g * variables. The publicKey BIT STRING contains, simply, the y variable. This can be verified * by getting a DSA PKCS8 public key: * * "openssl dsa -in private.dsa -pubout -outform PEM" * * ie. just swap out rsa with dsa in the rsa command above. * * A PKCS1 public key corresponds to the publicKey portion of the PKCS8 key. In the case of RSA * the publicKey portion /is/ the key. In the case of DSA it is not. You cannot verify a signature * without the parameters and the PKCS1 DSA public key format does not include the parameters. * * @see self::getPrivateKey() * @return mixed */ public function getPublicKey() { $type = self::validatePlugin('Keys', 'PKCS8', 'savePublicKey'); if (!isset($this->y)) { $this->y = $this->g->powMod($this->x, $this->p); } $key = $type::savePublicKey($this->p, $this->q, $this->g, $this->y); return DSA::loadFormat('PKCS8', $key) ->withHash($this->hash->getHash()) ->withSignatureFormat($this->shortFormat); } /** * Create a signature * * @see self::verify() * @param string $message * @return mixed */ public function sign($message) { $format = $this->sigFormat; if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) { $signature = ''; $result = openssl_sign($message, $signature, $this->toString('PKCS8'), $this->hash->getHash()); if ($result) { if ($this->shortFormat == 'ASN1') { return $signature; } extract(ASN1Signature::load($signature)); return $format::save($r, $s); } } $h = $this->hash->hash($message); $h = $this->bits2int($h); while (true) { $k = BigInteger::randomRange(self::$one, $this->q->subtract(self::$one)); $r = $this->g->powMod($k, $this->p); list(, $r) = $r->divide($this->q); if ($r->equals(self::$zero)) { continue; } $kinv = $k->modInverse($this->q); $temp = $h->add($this->x->multiply($r)); $temp = $kinv->multiply($temp); list(, $s) = $temp->divide($this->q); if (!$s->equals(self::$zero)) { break; } } // the following is an RFC6979 compliant implementation of deterministic DSA // it's unused because it's mainly intended for use when a good CSPRNG isn't // available. if phpseclib's CSPRNG isn't good then even key generation is // suspect /* $h1 = $this->hash->hash($message); $k = $this->computek($h1); $r = $this->g->powMod($k, $this->p); list(, $r) = $r->divide($this->q); $kinv = $k->modInverse($this->q); $h1 = $this->bits2int($h1); $temp = $h1->add($this->x->multiply($r)); $temp = $kinv->multiply($temp); list(, $s) = $temp->divide($this->q); */ return $format::save($r, $s); } /** * Returns the private key * * @param string $type * @param array $options optional * @return string */ public function toString($type, array $options = []) { $type = self::validatePlugin('Keys', $type, 'savePrivateKey'); if (!isset($this->y)) { $this->y = $this->g->powMod($this->x, $this->p); } return $type::savePrivateKey($this->p, $this->q, $this->g, $this->y, $this->x, $this->password, $options); } }