age mask clarification

2022-11-02 12:36:28 +01:00 · 2022-11-02 12:36:28 +01:00 · 9169f4447e
commit 9169f4447e
parent 34f46382f0
1 changed files with 3 additions and 0 deletions
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@ -1138,6 +1138,9 @@ struct TALER_BlindedDenominationSignature
 *
 * A value of 0 means that the exchange does not support the extension for
 * age-restriction.
+ *
+ * For a non-0 age mask, the 0th bit always must be set, otherwise the age
+ * mask is considered invalid.
 */
 struct TALER_AgeMask
 {