"4012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100036",
"VK_REC_ID" => "EYP",
"VK_NONCE" => "1",
"VK_RETURN" => "http://192.168.0.16:8020/dashboard",
"VK_DATETIME" => "2021-01-15T18:47:28+0000",
"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! SEB 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) . $fields["VK_SERVICE"] . /* 4012 */
str_pad (mb_strlen($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) . $fields["VK_SND_ID"] . /* uid100036 */
str_pad (mb_strlen($fields["VK_REC_ID"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_REC_ID"] . /* EYP */
str_pad (mb_strlen($fields["VK_NONCE"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_NONCE"] . /* 1 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* http://192.168.0.16:8020/dashboard */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"] . /* 2021-01-15T18:47:28+0000 */
str_pad (mb_strlen($fields["VK_RID"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RID"]; /* */
/* $data = "0044012003008009uid100036003EYP0011034http://192.168.0.16:8020/dashboard0242021-01-15T18:47:28+0000000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* bcZNQ4LoM+AfosKySZu2lLO2K60xQN9LQ2aDvt8HW1gnWOPvnPa98tctcaJqUE/YKkk/voYHQrCaUOqJ886p4+NBZPnN8O8uYgbM0xPsm5OZMFX4xkozLF40dxYOgaAshQk1GtkWJdhjM8yV9P3kM4ksB/avOFgPPsEleiSjjBk= */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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