Crypt_RSA phpseclib3 PHP 8 Issue

Question

As the title says:

We have recently upgraded to PHP 8 however, Crypt/RSA.php is deprecated and will not be supported in PHP 8 anymore, so we are forced to find another solution.

I heard that phpseclib3 is the same and able to support it, however, I cannot get it to work.

This is my current code:

$rsa = \phpseclib3\Crypt\RSA::loadPrivateKey($private_key);
$rsa = $rsa->withHash('sha256'); 
$rsa = $rsa->withPadding(RSA::SIGNATURE_PKCS1);
$ans = $rsa->sign("test");
echo $ans;

This is the previous code that works:

    $rsa = new Crypt_RSA();
    $rsa->loadKey($private_key);

    $rsa->setHash('sha256');     // Specify digest, e.g. sha256 (default is sha1)
    $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);

    $signature = base64_encode($rsa->sign($string_to_encrypt));

with the new code, I am getting this error: Uncaught OutOfRangeException: Signature representative out of range in xxx

The Key is the same so definitely, it is not the key's problem, I am unable to figure out what was wrong, can anyone help me with this?

Any help is appreciated!

Test Key:

Aaron Lee Herng Yue · Accepted Answer

Found the solution, can be done via OpenSSL RSA Sign.

Crypt_RSA phpseclib3 PHP 8 Issue

Answers (1)

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