hs: Remove hs_cell_onion_key_type_t enum

Unify this with the trunnel ABI so we don't duplicate.

Part of #30454

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

src/or/hs_cell.c

@@ -160,11 +160,12 @@ parse_introduce2_encrypted(const uint8_t *decrypted_data,
   }
 
   if (trn_cell_introduce_encrypted_get_onion_key_type(enc_cell) !=
-      HS_CELL_ONION_KEY_TYPE_NTOR) {
+      TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR) {
     log_info(LD_REND, "INTRODUCE2 onion key type is invalid. Got %u but "
                       "expected %u on circuit %u for service %s",
              trn_cell_introduce_encrypted_get_onion_key_type(enc_cell),
-             HS_CELL_ONION_KEY_TYPE_NTOR, TO_CIRCUIT(circ)->n_circ_id,
+             TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR,
+             TO_CIRCUIT(circ)->n_circ_id,
              safe_str_client(service->onion_address));
     goto err;
   }
@@ -257,7 +258,7 @@ introduce1_set_encrypted_onion_key(trn_cell_introduce_encrypted_t *cell,
   tor_assert(onion_pk);
   /* There is only one possible key type for a non legacy cell. */
   trn_cell_introduce_encrypted_set_onion_key_type(cell,
-                                                  HS_CELL_ONION_KEY_TYPE_NTOR);
+                                   TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR);
   trn_cell_introduce_encrypted_set_onion_key_len(cell, CURVE25519_PUBKEY_LEN);
   trn_cell_introduce_encrypted_setlen_onion_key(cell, CURVE25519_PUBKEY_LEN);
   memcpy(trn_cell_introduce_encrypted_getarray_onion_key(cell), onion_pk,

src/or/hs_cell.h

@@ -16,11 +16,6 @@
  * 3.2.2 of the specification). Below this value, the cell must be padded. */
 #define HS_CELL_INTRODUCE1_MIN_SIZE 246
 
-/* Onion key type found in the INTRODUCE1 cell. */
-typedef enum {
-  HS_CELL_ONION_KEY_TYPE_NTOR = 1,
-} hs_cell_onion_key_type_t;
-
 /* This data structure contains data that we need to build an INTRODUCE1 cell
  * used by the INTRODUCE1 build function. */
 typedef struct hs_cell_introduce1_data_t {

src/trunnel/hs/cell_introduce1.c

@@ -723,7 +723,7 @@ trn_cell_introduce_encrypted_new(void)
   trn_cell_introduce_encrypted_t *val = trunnel_calloc(1, sizeof(trn_cell_introduce_encrypted_t));
   if (NULL == val)
     return NULL;
-  val->onion_key_type = 1;
+  val->onion_key_type = TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR;
   return val;
 }
 
@@ -827,7 +827,7 @@ trn_cell_introduce_encrypted_get_onion_key_type(const trn_cell_introduce_encrypt
 int
 trn_cell_introduce_encrypted_set_onion_key_type(trn_cell_introduce_encrypted_t *inp, uint8_t val)
 {
-  if (! ((val == 1))) {
+  if (! ((val == TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR))) {
      TRUNNEL_SET_ERROR_CODE(inp);
      return -1;
   }
@@ -1069,7 +1069,7 @@ trn_cell_introduce_encrypted_check(const trn_cell_introduce_encrypted_t *obj)
     if (NULL != (msg = trn_cell_extension_check(obj->extensions)))
       return msg;
   }
-  if (! (obj->onion_key_type == 1))
+  if (! (obj->onion_key_type == TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR))
     return "Integer out of bounds";
   if (TRUNNEL_DYNARRAY_LEN(&obj->onion_key) != obj->onion_key_len)
     return "Length mismatch for onion_key";
@@ -1102,7 +1102,7 @@ trn_cell_introduce_encrypted_encoded_len(const trn_cell_introduce_encrypted_t *o
   /* Length of struct trn_cell_extension extensions */
   result += trn_cell_extension_encoded_len(obj->extensions);
 
-  /* Length of u8 onion_key_type IN [1] */
+  /* Length of u8 onion_key_type IN [TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR] */
   result += 1;
 
   /* Length of u16 onion_key_len */
@@ -1166,7 +1166,7 @@ trn_cell_introduce_encrypted_encode(uint8_t *output, const size_t avail, const t
     goto fail; /* XXXXXXX !*/
   written += result; ptr += result;
 
-  /* Encode u8 onion_key_type IN [1] */
+  /* Encode u8 onion_key_type IN [TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR] */
   trunnel_assert(written <= avail);
   if (avail - written < 1)
     goto truncated;
@@ -1270,11 +1270,11 @@ trn_cell_introduce_encrypted_parse_into(trn_cell_introduce_encrypted_t *obj, con
   trunnel_assert((size_t)result <= remaining);
   remaining -= result; ptr += result;
 
-  /* Parse u8 onion_key_type IN [1] */
+  /* Parse u8 onion_key_type IN [TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR] */
   CHECK_REMAINING(1, truncated);
   obj->onion_key_type = (trunnel_get_uint8(ptr));
   remaining -= 1; ptr += 1;
-  if (! (obj->onion_key_type == 1))
+  if (! (obj->onion_key_type == TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR))
     goto fail;
 
   /* Parse u16 onion_key_len */

src/trunnel/hs/cell_introduce1.h

@@ -18,6 +18,7 @@ struct link_specifier_st;
 #define TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 0
 #define TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1 1
 #define TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 2
+#define TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR 1
 #if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_INTRODUCE1)
 struct trn_cell_introduce1_st {
   uint8_t legacy_key_id[TRUNNEL_SHA1_LEN];

src/trunnel/hs/cell_introduce1.trunnel

@@ -22,6 +22,9 @@ const TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 = 0x00;
 const TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1 = 0x01;
 const TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 = 0x02;
 
+/* Onion key type. */
+const TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR = 0x01;
+
 /* INTRODUCE1 payload. See details in section 3.2.1. */
 struct trn_cell_introduce1 {
   /* Always zeroed. MUST be checked explicitly by the caller. */
@@ -59,7 +62,7 @@ struct trn_cell_introduce_encrypted {
   struct trn_cell_extension extensions;
 
   /* Onion key material. */
-  u8 onion_key_type IN [0x01];
+  u8 onion_key_type IN [TRUNNEL_HS_INTRO_ONION_KEY_TYPE_NTOR];
   u16 onion_key_len;
   u8 onion_key[onion_key_len];