-----BEGIN PUBLIC KEY-----
//64chars一行(多行)
-----END PUBLIC KEY-----
-----BEGIN RSA PRIVATE KEY-----
//64chars一行(多行)
-----END RSA PRIVATE KEY-----

/**
 * 將字符串格式公私鑰格式化為pem格式公私鑰
 * @param $secret_key
 * @param $type
 * @return string
 */
public static function format_secret_key($secret_key, $type){
  //64個(gè)英文字符后接換行符"\n",最后再接換行符"\n"
  $key = (wordwrap($secret_key, 64, "\n", true))."\n";
  //添加pem格式頭和尾
  if ($type == 'pub') {
    $pem_key = "-----BEGIN PUBLIC KEY-----\n" . $key . "-----END PUBLIC KEY-----\n";
  }else if ($type == 'pri') {
    $pem_key = "-----BEGIN RSA PRIVATE KEY-----\n" . $key . "-----END RSA PRIVATE KEY-----\n";
  }else{
    echo('公私鑰類型非法');
    exit();
  }
  return $pem_key;
}

/**
 * RSA加簽
 * @param $paramStr
 * @param $priKey
 * @return string
 */
public static function sign($paramStr, $priKey){
  $sign = '';
  //將字符串格式公私鑰轉(zhuǎn)為pem格式公私鑰
  $priKeyPem = SignUtil::format_secret_key($priKey, 'pri');
  //轉(zhuǎn)換為openssl密鑰，必須是沒(méi)有經(jīng)過(guò)pkcs8轉(zhuǎn)換的私鑰
  $res = openssl_get_privatekey($priKeyPem);
  //調(diào)用openssl內(nèi)置簽名方法，生成簽名$sign
  openssl_sign($paramStr, $sign, $res);
  //釋放資源
  openssl_free_key($res);
  //base64編碼簽名
  $signBase64 = base64_encode($sign);
  //url編碼簽名
  $sign = urlencode($signBase64);
  return $sign;
}

/**
 * RSA驗(yàn)簽
 * @param $paramStr
 * @param $sign
 * @param $pubKey
 * @return bool
 */
public static function verify($paramStr, $sign, $pubKey) {
  //將字符串格式公私鑰轉(zhuǎn)為pem格式公私鑰
  $pubKeyPem = SignUtil::format_secret_key($pubKey, 'pub');
  //轉(zhuǎn)換為openssl密鑰，必須是沒(méi)有經(jīng)過(guò)pkcs8轉(zhuǎn)換的公鑰
  $res = openssl_get_publickey($pubKeyPem);
  //url解碼簽名
  $signUrl = urldecode($sign);
  //base64解碼簽名
  $signBase64 = base64_decode($signUrl);
  //調(diào)用openssl內(nèi)置方法驗(yàn)簽，返回bool值
  $result = (bool)openssl_verify($paramStr, $signBase64, $res);
  //釋放資源
  openssl_free_key($res);
  //返回資源是否成功
  return $result;
}