"4012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100049",
"VK_REC_ID" => "LHV",
"VK_NONCE" => "3",
"VK_RETURN" => "http://127.0.0.1:56621/auth/complete/",
"VK_DATETIME" => "2021-02-18T08:44:57+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) . $fields["VK_RETURN"] . /* http://127.0.0.1:56621/auth/complete/ */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"] . /* 2021-02-18T08:44:57+0000 */
str_pad (mb_strlen($fields["VK_RID"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RID"]; /* */
/* $data = "0044012003008009uid100049003LHV0013037http://127.0.0.1:56621/auth/complete/0242021-02-18T08:44:57+0000000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* 0G3tQSTndebM+LVmX303lt5IJTjQGYG6MNBbZS2jp9wr2tAJLnRpmFl6W9uUaunbgvwJIP7DJj2Bf6+EbHScQzhIYKP53hu/eUyhTLeAzOB47Tr2mF6oFOAl1TEHn7HoIi2udGj3CCarjLjtzx5nEN0XUDz4gdOJXKdAuBkC8gUvX1ZXkONZfuTL5QAv4WDerrBgpiZwvAmifhvE7l7LKECGl/1RV13T6FDxPmIXmxXSWJ9O2rG1PjR4zDenB/T2yqtfwjiCxHKIBs5UcV3GlJ412VeMcf/sswHges/lgYsiGBcmQX4xyt774pti1Eh5tMG2/ODq8Sv1EILS+DLvEg== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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