/* RANDOMSRC interface */
-/* Return some random data. Returns TRUE for success. */
-typedef bool_t random_fn(void *st, int32_t bytes, uint8_t *buff);
+/* Return some random data. Cannot fail. */
+typedef void random_fn(void *st, int32_t bytes, uint8_t *buff);
struct random_if {
void *st;
typedef bool_t transform_valid_fn(void *st); /* 0: no key; 1: ok */
typedef void transform_delkey_fn(void *st);
typedef void transform_destroyinstance_fn(void *st);
-/* Returns:
- * 0: all is well
- * 1: for any other problem
- * 2: message decrypted but sequence number was out of range
- */
-typedef uint32_t transform_apply_fn(void *st, struct buffer_if *buf,
- const char **errmsg);
+
+typedef enum {
+ transform_apply_ok = 0, /* all is well (everyone may assume==0) */
+ transform_apply_err = 1, /* any other problem */
+ transform_apply_seqrange = 2,
+ /* message decrypted but sequence number was out of recent range */
+ transform_apply_seqdupe = 3,
+ /* message decrypted but was dupe of recent packet */
+} transform_apply_return;
+
+static inline bool_t
+transform_apply_return_badseq(transform_apply_return problem) {
+ return problem == transform_apply_seqrange ||
+ problem == transform_apply_seqdupe;
+}
+
+typedef transform_apply_return transform_apply_fn(void *st,
+ struct buffer_if *buf, const char **errmsg);
struct transform_inst_if {
void *st;