"1012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100052",
"VK_STAMP" => "57",
"VK_AMOUNT" => "15.00",
"VK_CURR" => "EUR",
"VK_REF" => "576",
"VK_MSG" => "Ref. 2101110001",
"VK_RETURN" => "https://opera.egg.thorgate.eu/et/orders/banks/thorbanks_response/",
"VK_CANCEL" => "https://opera.egg.thorgate.eu/et/orders/banks/thorbanks_response/",
"VK_DATETIME" => "2021-01-11T17:51:30+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) . $fields["VK_STAMP"] . /* 57 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 15.00 */
str_pad (mb_strlen($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) . $fields["VK_REF"] . /* 576 */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* Ref. 2101110001 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* https://opera.egg.thorgate.eu/et/orders/banks/thorbanks_response/ */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* https://opera.egg.thorgate.eu/et/orders/banks/thorbanks_response/ */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2021-01-11T17:51:30+0000 */
/* $data = "0041012003008009uid1000520025700515.00003EUR003576015Ref. 2101110001065https://opera.egg.thorgate.eu/et/orders/banks/thorbanks_response/065https://opera.egg.thorgate.eu/et/orders/banks/thorbanks_response/0242021-01-11T17:51:30+0000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* CdahA8gOYMXYDTgYQSFCnfVHVQ5Hz1oMOZMPu4u7c2TfeBlVK/nc94n01BFe1mYIkrN7H50uU3VKJhtHp8cH4bCLJ4avdQjpLm1VEw5mmslz67H2MXNhw1y3fZlmD9D1oNL7Hj841aDGB0C573kEp52qKwEHDvK5ued04IyRHVtApjBr9GqgAmQ3nwd5uXr3tiIxK7FObxKtusIeBd0MSh3SJ5bx5q7KxiJRVL4w5RP4ZKpe/L9K2ImQ0wjRqYYXVgptpI/EQ9dJJ8VjvI9cPAhkF8welBqdPCnL4tZYyJ41WqBDqJjFAy0jPGfP85+CElL3NjiKG5liMBZn/Cn0pA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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