prop224: Helper function to assert on invalid client intro circuit

Put all the possible assert() we can do on a client introduction circuit in
one helper function to make sure it is valid and usable.

It is disabled for now so gcc doesn't complain that we have a unused function.

Signed-off-by: David Goulet <dgoulet@torproject.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/or/hs_ident.c b/src/or/hs_ident.c
index e69350d82e..df39285158 100644
--- a/src/or/hs_ident.c
+++ b/src/or/hs_ident.c
@@ -86,3 +86,25 @@ hs_ident_edge_conn_free(hs_ident_edge_conn_t *ident)
   tor_free(ident);
 }
 
+/* Return true if the given ident is valid for an introduction circuit. */
+int
+hs_ident_intro_circ_is_valid(const hs_ident_circuit_t *ident)
+{
+  if (ident == NULL) {
+    goto invalid;
+  }
+
+  if (ed25519_public_key_is_zero(&ident->identity_pk)) {
+    goto invalid;
+  }
+
+  if (ed25519_public_key_is_zero(&ident->intro_auth_pk)) {
+    goto invalid;
+  }
+
+  /* Valid. */
+  return 1;
+ invalid:
+  return 0;
+}
+