Is There a PHP 5.3 Class for Unpadded RSA Encryption/Decryption?

RSA encryption and decryption, no padding in PHP

Problem:

in PHP 5.3 Is there a class that provides RSA encryption/decryption without padding? I have the private and public keys, p, q and modulus ready.

Answer:

You can use phpseclib, a pure PHP RSA implementation:

<?php
include('Crypt/RSA.php');

$privatekey = file_get_contents('private.key');

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

$plaintext = new Math_BigInteger('aaaaaa');
echo $rsa->_exponentiate($plaintext)->toBytes();
?>

phpseclib allows you to specify that plaintext and ciphertext should be used The padding type. In this case, we are not using padding, so we pass a Math_BigInteger object instead of a string.

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