Prepare for Lemmy!

Handle hs2019 in algorithm

index.php

@@ -1464,6 +1464,13 @@ HTML;
 		$signature = base64_decode( $signatureParts["signature"] );
 		$algorithm = $signatureParts["algorithm"];
 
+		//	There might be many different signing algorithms
+		//	TODO: Find a way to transform these automatically
+		//	See https://github.com/superseriousbusiness/gotosocial/issues/1186#issuecomment-1976166659 and https://github.com/snarfed/bridgy-fed/issues/430 for hs2019
+		if ( "hs2019" == $algorithm ) {
+			$algorithm = "sha256";
+		}
+
 		//	Finally! Calculate whether the signature is valid
 		//	Returns 1 if verified, 0 if not, false or -1 if an error occurred
 		$verified = openssl_verify(