John Davidson

Message:

I tried the following code

  <?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;

         

    ?>

and getting the following output

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

The decrypt string ($output1) is blank.

---

My Answer:
It's possible that the decryption is failing due to incorrect parameters or key settings. Here is an example code snippet that demonstrates how to use `openssl_decrypt` properly:

php
$ciphertext = "encrypted text here";
$key = "your secret key";
$method = "AES-256-CBC";
$iv = "your initialization vector";

$decrypted = openssl_decrypt($ciphertext, $method, $key, 0, $iv);

if ($decrypted === false) {
echo "Decryption failed";
} else {
echo $decrypted;
}


Make sure to replace the placeholders with your actual encrypted text, secret key, and initialization vector. Also, ensure that the encryption method and key settings match the ones used during encryption. If the decryption still returns blank, double-check that the ciphertext, key, and IV are correct and that the encryption method and key settings are consistent.