Update s if s > n/2

imduchuyyy · Jun 25, 2024 · 0c9aed3 · 0c9aed3
1 parent 619f20a
commit 0c9aed3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/WebAuthn.sol b/src/WebAuthn.sol
@@ -109,7 +109,7 @@ library WebAuthn {
     {
         if (webAuthnAuth.s > _P256_N_DIV_2) {
             // guard against signature malleability
-            return false;
+            webAuthnAuth.s = FCL_Elliptic_ZZ.n - webAuthnAuth.s;
         }
 
         // 11. Verify that the value of C.type is the string webauthn.get.