"1012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100049",
"VK_STAMP" => "123",
"VK_AMOUNT" => "100",
"VK_CURR" => "EUR",
"VK_REF" => "1232",
"VK_MSG" => "Test Message",
"VK_RETURN" => "http://localhost/payment/callback/bank/lhv",
"VK_CANCEL" => "http://localhost/payment/callback/bank/lhv",
"VK_DATETIME" => "2022-04-29T11:09:52+0300",
"VK_LANG" => "EST",
"VK_ACC" => "EE171010123456789017",
"VK_NAME" => "Veebimajutus",
"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! LHV 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) . $fields["VK_SND_ID"] . /* uid100049 */
str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] . /* 123 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 100 */
str_pad (mb_strlen($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) . $fields["VK_REF"] . /* 1232 */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* Test Message */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* http://localhost/payment/callback/bank/lhv */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* http://localhost/payment/callback/bank/lhv */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2022-04-29T11:09:52+0300 */
/* $data = "0041012003008009uid100049003123003100003EUR0041232012Test Message042http://localhost/payment/callback/bank/lhv042http://localhost/payment/callback/bank/lhv0242022-04-29T11:09:52+0300"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* CHE96zROjsCAgT5I+JYNwrdfPID8HQ544SeThI3d4Ux3EzSVNkKtsCXDGQ4jitxNf/i0TGEaBRgoEfGY/iQa8o87x2hCPN3/ADci9EUWo/6ABPhd7vuOA+Ux8jBd6wZZtWTNjY1T3kZ5c5QZUV9u9jSIp7YyhwRPo/+USWzLl5Y4gzts2KvNgtNv36yfALN3+0Pc4YbqfZseol7dPqdQ7p7nvZ5651FsT3KDrXtx3OduHz8X1ZqNYnMe6ZHiEaixLU3o/a8JLTKPn3rlc0biSdehPSQaGlT1DGawV4XBkwI4qbhBfpT/7/gHfJKmk9ILV2H8d1NE5DWgks08dPlBNQ== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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