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<?php
namespace MoneticoDemoWebKit\Monetico;
class HmacComputer
{
/**
* Returns a key that can be used for computing the seal.
* Some legacy keys were provided with non hexadecimal character. This methods converts these special
* characters to their correct hexadecimal representation.
*
* With legacy keys, the two last characters might be non hexadecimal.
* If it occurs, they have to be converted back to hexadecimal using the following rule :
* - Before last character : take the ASCII value and subtract 23 to have the real value (eg: 'P' has ASCII code 80 => 80-23 = 57 which is ASCII code for '9' character)
* - Last character : if it is an 'M' character, replace it with '0'
*
* @param string $key
*
* @return string
*
*/
public function sealFields(array $fields, string $key)
{
$stringToSeal = $this->getStringToSeal($fields);
return $this->sealString($stringToSeal, $this->getUsableKey($key));
}
public function validateSeal(array $fields, string $key, string $expectedSeal)
{
if ($fields !== null) {
$computedSeal = $this->sealFields($fields, $key);
return strtoupper($computedSeal) === strtoupper($expectedSeal) ? true : false;
}
return false;
}
public function getStringToSeal(array $formFields)
{
// The string to be sealed is composed of all the form fields sent
// 1. ordered alphabetically (numbers first, then capitalized letter, then other letters)
// 2. represented using the format key=value
// 3. separated by "*" character
// Please refer to technical documentation for more details
ksort($formFields);
array_walk($formFields, function (&$item, $key) {
$item = "$key=$item";
});
return implode('*', $formFields);
}
private function sealString(string $stringToSeal, string $key)
{
$MAC = hash_hmac(
"sha1",
$stringToSeal,
hex2bin($key)
);
return $MAC;
}
private function getUsableKey(string $key)
{
$hexStrKey = substr($key, 0, 38);
$hexFinal = "" . substr($key, 38, 2) . "00";
$cca0 = ord($hexFinal);
if ($cca0 > 70 && $cca0 < 97)
$hexStrKey .= chr($cca0 - 23) . substr($hexFinal, 1, 1);
else {
if (substr($hexFinal, 1, 1) == "M")
$hexStrKey .= substr($hexFinal, 0, 1) . "0";
else
$hexStrKey .= substr($hexFinal, 0, 2);
}
return $hexStrKey;
}
}
?>