Php openssl_decrypt返回空白

我尝试了以下代码

  <?PHP
    
       $encrypt_method = "AES-128-CBC";
        $secret_key = 'iuiuiui';
        $secret_iv = '1234567891234567';
        $string="keeri";
    
        // hash
        $key = hash('sha256', $secret_key);
        
        // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
        $iv = substr(hash('sha256', $secret_iv), 0, 16);
         $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
         
          echo "encrypt----)";
          echo $output ;
         
          echo "decrypt---";
           $output1 = openssl_decrypt($string, $encrypt_method, $key, 0, $iv);
           echo $output1;
         
    ?>

---

解密字符串（$output1）为空。

您的代码运行良好，但解密功能的输入数据错误

您正在向openssl_decrypt函数提供（原始）明文，而不是由openssl_encrypt加密的数据（“输出”）

关于代码安全性的友好信息：当您在“CBC”模式下使用AES算法时，必须使用随机生成的初始化向量（“iv”），否则您的完整加密将变得易受攻击

这将是加密/解密的输出：

encrypt----)3BR54C8qvhHG3e4Lgry4uw==decrypt---keeri

完整代码：

<?php
$encrypt_method = "AES-128-CBC";
$secret_key = 'iuiuiui';
$secret_iv = '1234567891234567';
$string="keeri";

// hash
$key = hash('sha256', $secret_key);

// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);

echo "encrypt----)";
echo $output ;

echo "decrypt---";
//$output1 = openssl_decrypt($string, $encrypt_method, $key, 0, $iv);
$output1 = openssl_decrypt($output, $encrypt_method, $key, 0, $iv);
echo $output1;
?>

<?php
$encrypt_method = "AES-128-CBC";
$secret_key = 'iuiuiui';
$secret_iv = '1234567891234567';
$string="keeri";

// hash
$key = hash('sha256', $secret_key);

// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);

echo "encrypt----)";
echo $output ;

echo "decrypt---";
//$output1 = openssl_decrypt($string, $encrypt_method, $key, 0, $iv);
$output1 = openssl_decrypt($output, $encrypt_method, $key, 0, $iv);
echo $output1;
?>