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<?php
namespace Zotlabs\Lib;
class JSalmon {
static function sign($data,$key_id,$key) {
$arr = $data;
$data = json_encode($data,JSON_UNESCAPED_SLASHES);
$data = base64url_encode($data, false); // do not strip padding
$data_type = 'application/x-zot+json';
$encoding = 'base64url';
$algorithm = 'RSA-SHA256';
$data = preg_replace('/\s+/','',$data);
// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
$precomputed = '.' . base64url_encode($data_type,false) . '.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
$signature = base64url_encode(rsa_sign($data . $precomputed, $key), false);
return ([
'signed' => true,
'data' => $data,
'data_type' => $data_type,
'encoding' => $encoding,
'alg' => $algorithm,
'sigs' => [
'value' => $signature,
'key_id' => base64url_encode($key_id)
]
]);
}
}
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