public function verify($message, $hash_alg, $r, $s)
{
$hash = new Crypt\Hash($hash_alg);
$hash_m = new BigInteger($hash->hash($message), 256);
$g = new BigInteger($this->_key->key['g'], 256);
$p = new BigInteger($this->_key->key['p'], 256);
$q = new BigInteger($this->_key->key['q'], 256);
$y = new BigInteger($this->_key->key['y'], 256);
$w = $s->modInverse($q);
$hash_m_mul = $hash_m->multiply($w);
$u1_base = $hash_m_mul->divide($q);
$u1 = $u1_base[1];
$r_mul = $r->multiply($w);
$u2_base = $r_mul->divide($q);
$u2 = $u2_base[1];
$g_pow = $g->modPow($u1, $p);
$y_pow = $y->modPow($u2, $p);
$g_pow_mul = $g_pow->multiply($y_pow);
$g_pow_mul_mod_base = $g_pow_mul->divide($p);
$g_pow_mul_mod = $g_pow_mul_mod_base[1];
$v_base = $g_pow_mul_mod->divide($q);
$v = $v_base[1];
return $v->compare($r) == 0;
}
/** */ public function verify($msg, $key) { $verify = new OpenPGP_Crypt_RSA($key->message); $pkey = $verify->key(); switch ($pkey->algorithm) { case 1: case 2: case 3: // RSA return $verify->verify($msg->message); case 17: // DSA $dsa = new Horde_Pgp_Crypt_DSA($pkey); $verifier = function ($m, $s) use($dsa) { return $dsa->verify($m, Horde_String::lower($s->hash_algorithm_name()), new Math_BigInteger($s->data[0], 256), new Math_BigInteger($s->data[1], 256)); }; return $msg->message->verified_signatures(array('DSA' => array('MD5' => $verifier, 'SHA1' => $verifier, 'SHA224' => $verifier, 'SHA256' => $verifier, 'SHA384' => $verifier, 'SHA512' => $verifier))); } throw new RuntimeException(); }