X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/ff7cdc9ea887dfef812d914ba4f0a3e62f4c0e58..e8a0782f42c256c06905e0006ba4473b08ba3bf7:/secnet.h

diff --git a/secnet.h b/secnet.h
index 5f8e43b..6ac64e3 100644
--- a/secnet.h
+++ b/secnet.h
@@ -387,15 +387,21 @@ struct site_if {
 
 typedef struct transform_inst_if *transform_createinstance_fn(void *st);
 typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen);
+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 for 'all is well', any other value for a problem */
+/* 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);
 
 struct transform_inst_if {
     void *st;
     transform_setkey_fn *setkey;
+    transform_valid_fn *valid;
     transform_delkey_fn *delkey;
     transform_apply_fn *forwards;
     transform_apply_fn *reverse;