"4012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100049",
"VK_REC_ID" => "LHV",
"VK_NONCE" => "3",
"VK_RETURN" => "http://127.0.0.1:57097/auth/complete/",
"VK_DATETIME" => "2020-12-29T14:19:28+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! 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) . $fields["VK_SERVICE"] . /* 4012 */
str_pad (mb_strlen($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) . $fields["VK_SND_ID"] . /* uid100049 */
str_pad (mb_strlen($fields["VK_REC_ID"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_REC_ID"] . /* LHV */
str_pad (mb_strlen($fields["VK_NONCE"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_NONCE"] . /* 3 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* http://127.0.0.1:57097/auth/complete/ */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"] . /* 2020-12-29T14:19:28+0000 */
str_pad (mb_strlen($fields["VK_RID"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RID"]; /* */
/* $data = "0044012003008009uid100049003LHV0013037http://127.0.0.1:57097/auth/complete/0242020-12-29T14:19:28+0000000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* rLK4welOlOj+zKLbLFvL/G5D5PZtZxj/vYizuDTuSBABcrHGaFSTcCbN6qfbiPlaNIeFDuSzFxtOC4XBW8rP/DGqJo5Xbf4HKVivCC7NYS0OLoqPXGPFSCIp9smzDqtDRBP8bhEHUktxVfj6aucKHIbZ3VIPCVqeDpwMzmjTbDBA02CuRI3pk6OKhNRvucOsaLlGAMZNdfGjtHHUcH17yYddTytD4dnxCswr3wTaC5t+NmY1cB4P4mto889wCOYXexCIWxDWXfTBMbgzETnC10WWZR6wWiq+WyzBiDVo+FOBIZJr3tAKdehoSK28TdhTz1hIQAv0b3bMhoKee4r3OA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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