CertCode

<?php
$MY_KEY_FILE = "/home2/myusername/paypal/test-prvkey.pem";
$MY_CERT_FILE = "/home2/myusername/paypal/test-pubcert.pem";
$PAYPAL_CERT_FILE = "/home2/myusername/paypal/sandbox_cert.pem";
$OPENSSL = "/usr/bin/openssl";

$form = array('cmd' => '_cart',
        'add' => '1',
        'business' => 'paypal-facilitator@domain.com',
        'cert_id' => 'CERTIFICATEIDHERE',
        'lc' => 'US',
        'custom' => 'Test Photo',
        'invoice' => '',
        'currency_code' => 'USD',
        'no_shipping' => '0',
        'item_name' => 'Item Name',
        'item_number' => 'Item Number',
        'amount' => '25'
    );
global $encrypted;
$encrypted = paypal_encrypt($form);
function paypal_encrypt($hash)
{
    global $MY_KEY_FILE;
    global $MY_CERT_FILE;
    global $PAYPAL_CERT_FILE;
    global $OPENSSL;
    if (!file_exists($MY_KEY_FILE)) {
        echo "ERROR: MY_KEY_FILE $MY_KEY_FILE not found\n";
    }
    if (!file_exists($MY_CERT_FILE)) {
        echo "ERROR: MY_CERT_FILE $MY_CERT_FILE not found\n";
    }
    if (!file_exists($PAYPAL_CERT_FILE)) {
        echo "ERROR: PAYPAL_CERT_FILE $PAYPAL_CERT_FILE not found\n";
    }
    $hash['bn']= 'StellarWebSolutions.PHP_EWP2';
    $data = "";
    foreach ($hash as $key => $value) {
        if ($value != "") {
            //echo "Adding to blob: $key=$value\n";
            $data .= "$key=$value\n";
        }
    }
    $openssl_cmd = "($OPENSSL smime -sign -signer $MY_CERT_FILE -inkey $MY_KEY_FILE " .
                        "-outform der -nodetach -binary <<_EOF_\n$data\n_EOF_\n) | " .
                        "$OPENSSL smime -encrypt -des3 -binary -outform pem $PAYPAL_CERT_FILE";
    exec($openssl_cmd, $output, $error);
    if (!$error) {
        return implode("\n",$output);
    } else {
        return "ERROR: encryption failed";
    }
};
?>