Encrypt and Decrypt String With Key PHP [duplicate]

Question

I'm looking for some functions to encrypt and decrypt strings in php using a key specified.

Thanks!

Answer 1

A basic openssl implementation I've used before:

class MyEncryption
{

    public $pubkey = '...public key here...';
    public $privkey = '...private key here...';

    public function encrypt($data)
    {
        if (openssl_public_encrypt($data, $encrypted, $this->pubkey))
            $data = base64_encode($encrypted);
        else
            throw new Exception('Unable to encrypt data. Perhaps it is bigger than the key size?');

        return $data;
    }

    public function decrypt($data)
    {
        if (openssl_private_decrypt(base64_decode($data), $decrypted, $this->privkey))
            $data = $decrypted;
        else
            $data = '';

        return $data;
    }
}

You would need to generate the RSA key pair. See here for information on how to do that. Storing the private key in the file itself is a bad idea. This is just an example. Ideally you would want the user to supply the private key at decryption time

Answer 2

Start with this: http://www.ibm.com/developerworks/opensource/library/os-php-encrypt/

After that, have a look at Pascal MARTIN's answer in How do I encrypt a string in PHP?