Exemple #1
0
 /**
 * EMSA-PKCS1-V1_5-ENCODE
 *
 * See {@link http://tools.ietf.org/html/rfc3447#section-9.2 RFC3447#section-9.2}.
 *
 * @access private
 * @param String $m
 * @param Integer $emLen
 * @return String
 */
 function _emsa_pkcs1_v1_5_encode($m, $emLen)
 {
     $h = $this->hash->hash($m);
     if ($h === false) {
         return false;
     }
     // see http://tools.ietf.org/html/rfc3447#page-43
     switch ($this->hashName) {
         case 'md2':
             $t = pack('H*', '3020300c06082a864886f70d020205000410');
             break;
         case 'md5':
             $t = pack('H*', '3020300c06082a864886f70d020505000410');
             break;
         case 'sha1':
             $t = pack('H*', '3021300906052b0e03021a05000414');
             break;
         case 'sha256':
             $t = pack('H*', '3031300d060960864801650304020105000420');
             break;
         case 'sha384':
             $t = pack('H*', '3041300d060960864801650304020205000430');
             break;
         case 'sha512':
             $t = pack('H*', '3051300d060960864801650304020305000440');
     }
     $t .= $h;
     $tLen = strlen($t);
     if ($emLen < $tLen + 11) {
         user_error('Intended encoded message length too short', E_USER_NOTICE);
         return false;
     }
     $ps = str_repeat(chr(0xff), $emLen - $tLen - 3);
     $em = "{$ps}{$t}";
     return $em;
 }
Exemple #2
0
 /**
  * DSA verify
  *
  * @param string $message message
  * @param string $hash_alg hash algorithm
  * @param MathBigInteger $r r
  * @param MathBigInteger $s s
  * @param MathBigInteger $p p
  * @param MathBigInteger $q q
  * @param MathBigInteger $g g
  * @param MathBigInteger $y public key
  * @return bool
  */
 public static function verify($message, $hash_alg, $r, $s, $p, $q, $g, $y)
 {
     $hash = new CryptHash($hash_alg);
     $hash_m = new MathBigInteger($hash->hash($message), 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;
 }