//创建签名
private function _createSign()
{
    $strSalt = '1scv6zfzSR1wLaWN';
    $strVal  = '';
    if ($this->params) {
        $params = $this->params;
        ksort($params);
        $strVal = http_build_query($params, '', '&', PHP_QUERY_RFC3986);
    }
    return md5(md5($strSalt).md5($strVal));
}

//验证签名
if ($_GET['sign'] != $this->_createSign()) {
    echo 'Invalid Sign.';
}

//密码加密
$password = '123456';
$strPwdHash = password_hash($password, PASSWORD_DEFAULT);

//密码验证
if (password_verify($password, $strPwdHash)) {
  //Success
} else {
  //Fail
}

class Aes
{
    /**
     * var string $method 加解密方法
     */
    protected $method;

    /**
     * var string $secret_key 加解密的密钥
     */
    protected $secret_key;

    /**
     * var string $iv 加解密的向量
     */
    protected $iv;

    /**
     * var int $options
     */
    protected $options;

    /**
     * 构造函数
     * @param string $key     密钥
     * @param string $method  加密方式
     * @param string $iv      向量
     * @param int    $options
     */
    public function __construct($key = '', $method = 'AES-128-CBC', $iv = '', $options = OPENSSL_RAW_DATA)
    {
        $this->secret_key = isset($key) ? $key : 'CWq3g0hgl7Ao2OKI';
        $this->method = in_array($method, openssl_get_cipher_methods()) ? $method : 'AES-128-CBC';
        $this->iv = $iv;
        $this->options = in_array($options, [OPENSSL_RAW_DATA, OPENSSL_ZERO_PADDING]) ? $options : OPENSSL_RAW_DATA;
    }

    /**
     * 加密
     * @param string $data 加密的数据
     * @return string
     */
    public function encrypt($data = '')
    {
        return base64_encode(openssl_encrypt($data, $this->method, $this->secret_key, $this->options, $this->iv));
    }

    /**
     * 解密
     * @param string $data 解密的数据
     * @return string
     */
    public function decrypt($data = '')
    {
        return openssl_decrypt(base64_decode($data), $this->method, $this->secret_key, $this->options, $this->iv);
    }
}

$aes = new Aes('HFu8Z5SjAT7CudQc');
$encrypted = $aes->encrypt('锄禾日当午');
echo '加密前：锄禾日当午<br>加密后：', $encrypted, '<hr>';

$decrypted = $aes->decrypt($encrypted);
echo '加密后：', $encrypted, '<br>解密后：', $decrypted;

class Rsa2 
{
    private static $PRIVATE_KEY = 'private_key.pem 内容';
    private static $PUBLIC_KEY  = 'public_key.pem 内容';

    /**
     * 获取私钥
     * @return bool|resource
     */
    private static function getPrivateKey()
    {
        $privateKey = self::$PRIVATE_KEY;
        return openssl_pkey_get_private($privateKey);
    }

    /**
     * 获取公钥
     * @return bool|resource
     */
    private static function getPublicKey()
    {
        $publicKey = self::$PUBLIC_KEY;
        return openssl_pkey_get_public($publicKey);
    }

    /**
     * 私钥加密
     * @param string $data
     * @return null|string
     */
    public static function privateEncrypt($data = '')
    {
        if (!is_string($data)) {
            return null;
        }
        return openssl_private_encrypt($data,$encrypted,self::getPrivateKey()) ? base64_encode($encrypted) : null;
    }

    /**
     * 公钥加密
     * @param string $data
     * @return null|string
     */
    public static function publicEncrypt($data = '')
    {
        if (!is_string($data)) {
            return null;
        }
        return openssl_public_encrypt($data,$encrypted,self::getPublicKey()) ? base64_encode($encrypted) : null;
    }

    /**
     * 私钥解密
     * @param string $encrypted
     * @return null
     */
    public static function privateDecrypt($encrypted = '')
    {
        if (!is_string($encrypted)) {
            return null;
        }
        return (openssl_private_decrypt(base64_decode($encrypted), $decrypted, self::getPrivateKey())) ? $decrypted : null;
    }

    /**
     * 公钥解密
     * @param string $encrypted
     * @return null
     */
    public static function publicDecrypt($encrypted = '')
    {
        if (!is_string($encrypted)) {
            return null;
        }
        return (openssl_public_decrypt(base64_decode($encrypted), $decrypted, self::getPublicKey())) ? $decrypted : null;
    }

    /**
     * 创建签名
     * @param string $data 数据
     * @return null|string
     */
    public function createSign($data = '')
    {
        if (!is_string($data)) {
            return null;
        }
        return openssl_sign($data, $sign, self::getPrivateKey(), OPENSSL_ALGO_SHA256) ? base64_encode($sign) : null;
    }

    /**
     * 验证签名
     * @param string $data 数据
     * @param string $sign 签名
     * @return bool
     */
    public function verifySign($data = '', $sign = '')
    {
        if (!is_string($sign) || !is_string($sign)) {
            return false;
        }
        return (bool)openssl_verify($data, base64_decode($sign), self::getPublicKey(), OPENSSL_ALGO_SHA256);
    }
}

$rsa2 = new Rsa2();
        
$privateEncrypt = $rsa2->privateEncrypt('锄禾日当午');
echo '私钥加密后:'.$privateEncrypt.'<br>';

$publicDecrypt = $rsa2->publicDecrypt($privateEncrypt);
echo '公钥解密后:'.$publicDecrypt.'<br>';

$publicEncrypt = $rsa2->publicEncrypt('锄禾日当午');
echo '公钥加密后:'.$publicEncrypt.'<br>';

$privateDecrypt = $rsa2->privateDecrypt($publicEncrypt);
echo '私钥解密后:'.$privateDecrypt.'<br>';

$sign = $rsa2->createSign('锄禾日当午');
echo '生成签名:'.$privateEncrypt.'<br>';

$status = $rsa2->verifySign('锄禾日当午', $sign);
echo '验证签名:'.($status ? '成功' : '失败') ;