"1012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100052",
"VK_STAMP" => "66355",
"VK_AMOUNT" => "138",
"VK_CURR" => "EUR",
"VK_REF" => "663557",
"VK_MSG" => "Order nr. 66355",
"VK_RETURN" => "https://vm-backend.dev.elkdata.ee/payment/callback/order/bank",
"VK_CANCEL" => "https://vm-backend.dev.elkdata.ee/payment/callback/order/bank",
"VK_DATETIME" => "2022-05-10T17:52:46+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! 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) . $fields["VK_STAMP"] . /* 66355 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 138 */
str_pad (mb_strlen($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) . $fields["VK_REF"] . /* 663557 */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* Order nr. 66355 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* https://vm-backend.dev.elkdata.ee/payment/callback/order/bank */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* https://vm-backend.dev.elkdata.ee/payment/callback/order/bank */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2022-05-10T17:52:46+0300 */
/* $data = "0041012003008009uid10005200566355003138003EUR006663557015Order nr. 66355061https://vm-backend.dev.elkdata.ee/payment/callback/order/bank061https://vm-backend.dev.elkdata.ee/payment/callback/order/bank0242022-05-10T17:52:46+0300"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* KDL5wb9SegKM7wEBWJHf566R0/mlF+INolb1y34n8sgNqbRyaRMjrA8vp27YUFkP0zBGNnba0WPuZEp98em+p/cXu6EXi07RMmRra843BPduSSm/XvvR9KqNN0cPqn3DC5IcF8QGe/Ajzx8jChlWuyvO7LIcCz76bDFxa7O/sTYFJ3AmnZsvkApHZUxqppdw4ejN9fDINBOdhNR+LcKXGdkPoCZ41wd4l+M9+zsdcrOYsTJqM/ul+zU/lK9xDGdS7gVYPyTSgdb9vA/IBMTHYr2yRhjrc6EVwU6GiulMDdHRW8tLjtQ3OSEEWNQ2SjDDZV1G0GymQbRSRCpok3Svjg== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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