OpenSSl + PHP how to implement it [closed]

Question

I need to use openSSL into a project, I do not have experience using this, somo can anybody help?, I will use php for this.

Thank you.

Answer 1

Do you want to generate a pair of keys with php?

$NEW_KEY = openssl_pkey_new(array(
    'private_key_bits' => 1024,
    'private_key_type' => OPENSSL_KEYTYPE_RSA,
        ));

openssl_pkey_export_to_file($NEW_KEY, 'private.key');

$NEW_KEY_DETAILS = openssl_pkey_get_details($NEW_KEY);
file_put_contents('public.key', $NEW_KEY_DETAILS['key']);

openssl_free_key($NEW_KEY);

Do you already have the keys ?

$public = "-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfmlc2EgrdhvakQApmLCDOgP0n
NERInBheMh7J/r5aU8PUAIpGXET/8+kOGI1dSYjoux80AuHvkWp1EeHfMwC/SZ9t
6rF4sYqV5Lj9t32ELbh2VNbE/7QEVZnXRi5GdhozBZtS1gJHM2/Q+iToyh5dfTaA
U8bTnLEPMNC1h3qcUQIDAQAB
-----END PUBLIC KEY-----";

$private = "-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----";

if (!$privateKey = openssl_pkey_get_private($private)) die('Loading Private Key failed');
if (!$publicKey = openssl_pkey_get_public($public)) die('Loading Public Key failed');

$encrypted = '';
$decrypted = '';

$plaintext = 'This is just some text to encrypt';

echo '<p>$plaintext = ' . $plaintext . '<p>';

if (!openssl_public_encrypt($plaintext, $encrypted, $publicKey))    die('Failed to encrypt data');

echo '<p>$encrypted = ' . $encrypted . '<p>';

if (!openssl_private_decrypt($encrypted, $decrypted, $privateKey))  die('Failed to decrypt data');

echo '<p>$decrypted = ' . $decrypted . '<p>';

There you go, Enjoy!

Answer 2

Here are some examples on how to use openssl and php:

function encryptData($source, $privateKey)
{
    $maxLength = 117;

    $output = "";
    while ($source)
    {
        $slice = substr($source, 0, $maxLength);
        $source = substr($source, $maxLength);

        openssl_private_encrypt($slice, $encrypted, $privateKey);
        $output .= $encrypted;
    }

    return $output;
}

function decryptData($source, $publicKey)
{
    $maxLength = 128;

    $output = "";
    while ($source)
    {
        $slice = substr($source, 0, $maxLength);
        $source = substr($source, $maxLength);

        openssl_public_decrypt($slice, $decrypted, $publicKey);

        $output .= $decrypted;
    }

    return $output;
}

// usage
$myPrivateKey = ""; // your generated private key
$myPublicKey = "";  // your generated public key

$rawText = "lorem ipsum";

$crypted = encryptData($rawText, $myPrivateKey);
$decrypted = decryptData($crypted, $myPublicKey);

to generate your private/public key pair, just execute the following commands:

openssl genrsa -out private_key.pem 1024
openssl rsa -pubout -in private_key.pem -out public_key.pem

you will found two key on your current directory. If you need to add them onto variable, beware the whitespaces.