Make fe_cmov take max of magnitudes

2023-05-15 09:36:55 -04:00
parent 83186db34a
commit 31b4bbee1e
3 changed files with 19 additions and 17 deletions
--- a/src/field.h
+++ b/src/field.h
@@ -310,7 +310,9 @@ static void secp256k1_fe_storage_cmov(secp256k1_fe_storage *r, const secp256k1_f
 *
 * On input, both r and a must be valid field elements. Flag must be 0 or 1.
 * Performs {r = flag ? a : r}.
- * On output, r's magnitude and normalized will equal a's in case of flag=1, unchanged otherwise.
+ *
+ * On output, r's magnitude will be the maximum of both input magnitudes.
+ * It will be normalized if and only if both inputs were normalized.
 */
 static void secp256k1_fe_cmov(secp256k1_fe *r, const secp256k1_fe *a, int flag);