diff options
| -rw-r--r-- | Zotlabs/Lib/JSalmon.php | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Zotlabs/Lib/JSalmon.php b/Zotlabs/Lib/JSalmon.php new file mode 100644 index 000000000..763f687fa --- /dev/null +++ b/Zotlabs/Lib/JSalmon.php @@ -0,0 +1,38 @@ +<?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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