"4012",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100036",
        "VK_REC_ID"      => "EYP",
        "VK_NONCE"       => "2",
        "VK_RETURN"      => "http://127.0.0.1:42535/auth/complete/",
        "VK_DATETIME"    => "2020-12-29T14:19:53+0000",
        "VK_ENCODING"    => "UTF-8",
);
// STEP 3. Generate data to be signed
// ==================================
// Data to be signed is in the form of XXXYYYYY where XXX is 3 char
// zero padded length of the value and YYY the value itself
// NB! SEB expects symbol count, not byte count with UTF-8,
// so use `mb_strlen` instead of `strlen` to detect the length of a string
$data = str_pad (mb_strlen($fields["VK_SERVICE"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_SERVICE"] .    /* 4012 */
        str_pad (mb_strlen($fields["VK_VERSION"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_VERSION"] .    /* 008 */
        str_pad (mb_strlen($fields["VK_SND_ID"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_SND_ID"] .     /* uid100036 */
        str_pad (mb_strlen($fields["VK_REC_ID"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_REC_ID"] .     /* EYP */
        str_pad (mb_strlen($fields["VK_NONCE"], "UTF-8"),   3, "0", STR_PAD_LEFT) . $fields["VK_NONCE"] .      /* 2 */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* http://127.0.0.1:42535/auth/complete/ */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"] .   /* 2020-12-29T14:19:53+0000 */
        str_pad (mb_strlen($fields["VK_RID"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_RID"];         /*  */
/* $data = "0044012003008009uid100036003EYP0012037http://127.0.0.1:42535/auth/complete/0242020-12-29T14:19:53+0000000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* GEivTSzwkt+pop8vJ0gvG5tPzqIeVSUhR4YnbU+5dveMseFgU3sPMy1AcRkI1w1bi99Rg3BKEPtNjyiK/tPwysWoYZ/e4XgwGoO7LVCIR3+wCqPy1C3xDiHtn20ffgE7SvSMQ+goE+m7EcDlGFminG82Xt46xjYbiNraVVcAS94WIGvuGA46oOueWqfJhcO230K4eRxXEiGQmSNF+7s4VZXPKNXgx8UL4z0XCtq0vBy+Nb/kuUINjtn0662/uu3CC0cAne4L2TST8MZS3VBHOx8xpNQq2U/pKW9TpdtdLU6R4PYPuQ8Iud6IEHqi691hg/j4yhCyQ6cfEwoxRKzQUg== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Autentimise näidisrakendus "SEB"