"1012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100052",
"VK_STAMP" => "4321",
"VK_AMOUNT" => "20.00",
"VK_CURR" => "EUR",
"VK_REF" => "43216",
"VK_MSG" => "Vaheajatellimus 2304170001 20.04.2023 19:00",
"VK_RETURN" => "http://localhost:8000/et/orders/banks/thorbanks_response/",
"VK_CANCEL" => "http://localhost:8000/et/orders/banks/thorbanks_response/",
"VK_DATETIME" => "2023-04-17T12:12:53+0000",
"VK_LANG" => "EST",
"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! Swedbank 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) . $fields["VK_SERVICE"] . /* 1012 */
str_pad (mb_strlen($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) . $fields["VK_SND_ID"] . /* uid100052 */
str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] . /* 4321 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 20.00 */
str_pad (mb_strlen($fields["VK_CURR"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CURR"] . /* EUR */
str_pad (mb_strlen($fields["VK_REF"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_REF"] . /* 43216 */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* Vaheajatellimus 2304170001 20.04.2023 19:00 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* http://localhost:8000/et/orders/banks/thorbanks_response/ */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* http://localhost:8000/et/orders/banks/thorbanks_response/ */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2023-04-17T12:12:53+0000 */
/* $data = "0041012003008009uid100052004432100520.00003EUR00543216043Vaheajatellimus 2304170001 20.04.2023 19:00057http://localhost:8000/et/orders/banks/thorbanks_response/057http://localhost:8000/et/orders/banks/thorbanks_response/0242023-04-17T12:12:53+0000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* ONa+3PthZAJIVCi/Z6fRm5MhKixsuzFqLd9KsdKRQzdXYEgWVDVQkLG8d4ys+8+SxKoMiNvDT9UnssSY75zOLlULzeHweKVTdHbdWNMTHgqCJzPqa7pzQBQO5oVqDdNckQtwyURIrW0am5w+4KlCUorrUYcMXb/T1XhlQhZXKXf1p96nfZPha1oAVullK4Csd50CrgYS16cCl5RJLk5Ucf79MBBDcKE7fuKvZ2nRYEQTnGndJcg34l60es7e5vN8p6rekNnzJWyxJHSQnMSOW5ldmJ3bh9w0uYv47UAtRVtEarp+mRpqiL5wYjkAm7e31fM6h0FL1iAYDzyiKy9QBA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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