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encryption openssl in php

I want to encrypt and decrypt strings and files in PHP and Ive found a few examples (including some on experts-exchange and some answers to my own questions) however reading up cryptography Ive found several suggesting to use openssl instead of older cryptography solutions. Problem is Ive found very limited resources and examples of using openssl in php for encrypting strings and files.

Anyone got any resources or examples of encrypting and decryption using openssl in php?

Thank you in advance

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Ahmed Merghani

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tonelm54

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Just for anyone else digging around for this I found this a good example.

To generate a Personally signed SSL certificate I used https://www.trustico.co.uk/ssltools/create/certificate-pem/create-self-signed-ssl-certificate.php

And then used:-

<?php
function EncryptData($source)
{
    $fp=fopen("c:/Rob/cert.txt","r");
    $pub_key=fread($fp,8192);
    fclose($fp);
    openssl_get_publickey($pub_key);
    /*
    * NOTE:  Here you use the $pub_key value (converted, I guess)
    */
    openssl_public_encrypt($source,$crypttext,$pub_key);
    return(base64_encode($crypttext));
}

function DecryptData($source)
{
    #print("number : $number");
    $fp=fopen("c:/Rob/key.txt","r");
    $priv_key=fread($fp,8192);
    fclose($fp);
    // $passphrase is required if your key is encoded (suggested)
    //$res = openssl_get_privatekey($priv_key,$passphrase);
    $res = openssl_get_privatekey($priv_key);
    /*
    * NOTE:  Here you use the returned resource value
    */
    $decoded_source = base64_decode($source);
    openssl_private_decrypt($decoded_source,$newsource,$res);
    return($newsource);
}

$originalText = 'This is a test';
$encryptedText = EncryptData($originalText);
$dectyptedText = DecryptData($encryptedText);

echo $originalText . "<hr/>" . $encryptedText . "<hr/>" . $dectyptedText;

?>

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