"1011",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100049",
"VK_STAMP" => "37873",
"VK_AMOUNT" => "24",
"VK_CURR" => "EUR",
"VK_ACC" => "EE094204278699999907",
"VK_NAME" => "TEST FIRMA AS",
"VK_MSG" => "37873-2011-216",
"VK_RETURN" => "http://pagaripoisid.local.com/payment/swed",
"VK_CANCEL" => "http://pagaripoisid.local.com/payment/swed",
"VK_DATETIME" => "2020-11-02T01:18:44+0200",
"VK_ENCODING" => "UTF-8",
"VK_LANG" => "EST"
);
// 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) . $fields["VK_SERVICE"] . /* 1011 */
str_pad (mb_strlen($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) . $fields["VK_SND_ID"] . /* uid100049 */
str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] . /* 37873 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 24 */
str_pad (mb_strlen($fields["VK_CURR"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CURR"] . /* EUR */
str_pad (mb_strlen($fields["VK_ACC"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_ACC"] . /* EE094204278699999907 */
str_pad (mb_strlen($fields["VK_NAME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_NAME"] . /* TEST FIRMA AS */
str_pad (mb_strlen($fields["VK_REF"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_REF"] . /* */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* 37873-2011-216 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* http://pagaripoisid.local.com/payment/swed */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* http://pagaripoisid.local.com/payment/swed */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2020-11-02T01:18:44+0200 */
/* $data = "0041011003008009uid1000490053787300224003EUR020EE094204278699999907013TEST FIRMA AS00001437873-2011-216042http://pagaripoisid.local.com/payment/swed042http://pagaripoisid.local.com/payment/swed0242020-11-02T01:18:44+0200"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* nWqSW3sCAeYaRzQs8K08BT2/MNKd+Ij75oPDYrMceAJYoMeowUZjEVWxrLglGdlX8rHaT1tZyyPFSBwM9702piZFHC8zYJqQWpr2qT+s2mGXoAlK1lg2L1uNMPq3+ILeJWj6bD8Z4LAq6JvJtQHQjhNi3hQOWbGe/9W+blSvgvEscrH/YZgd5fuo1p1iwtHOUefYdhc6Ma6r6jWovBp/yZwiwMymIlufLqpB597CXsvmlgLX9YOvSBQzFcFSFlhJ00YSl4JQcH6LF+O2j2gZPrnWz4eRz+O4VxxQOZ0M6/EHOqTySGJCctew6h1xXjHfc2TlPD2W4v7BnLQ0n0Cv7A== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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