From f3134997ccbb525cd09a8144ed6daeeb3245326a Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordberg.se>
Date: Thu, 1 Apr 2021 12:54:48 +0200
Subject: trunnel description take two

---
 trunnel/stfe.trunnel | 79 +++++++++++++++++++++++++++++-----------------------
 1 file changed, 44 insertions(+), 35 deletions(-)

(limited to 'trunnel/stfe.trunnel')

diff --git a/trunnel/stfe.trunnel b/trunnel/stfe.trunnel
index eb82942..8a26d92 100644
--- a/trunnel/stfe.trunnel
+++ b/trunnel/stfe.trunnel
@@ -1,11 +1,15 @@
+/* always POST for consistency? */
+
+const MAGIC_V1 = 0x535446455f5f5631; /* "STFE__V1" */
+
 const T_GET_ENTRIES_V1 = 1;
 const T_GET_PROOF_BY_HASH_V1 = 2;
 const T_GET_CONSISTENCY_PROOF_V1 = 3;
-const T_INCLUSION_PROOF_V1 = 4;
-const T_CONSISTENCY_PROOF_V1 = 5;
-const T_SIGNED_TREE_HEAD_V1 = 6;
-const T_SIGNED_CHECKSUM32_ED25519_V1 = 7;
-const T_ED25519_V1 = 8;
+
+const T_ENTRIES_V1 = 4;
+const T_INCLUSION_PROOF_V1 = 5;
+const T_CONSISTENCY_PROOF_V1 = 6;
+const T_SIGNED_TREE_HEAD_V1 = 7;
 
 struct req_get_entries_v1 {
   u64 start_size;
@@ -23,6 +27,7 @@ struct req_get_consistency_proof_v1 {
 };
 
 struct request_v1 {
+  u64 magic IN [ MAGIC_V1 ];
   u64 format IN [ T_GET_ENTRIES_V1, T_GET_PROOF_BY_HASH_V1, T_GET_CONSISTENCY_PROOF_V1 ];
 
   union request[format] {
@@ -33,53 +38,57 @@ struct request_v1 {
   };
 }	    
 
+struct sigident_ed25519 {
+  u8 signature[64];
+  u8 identifier[32];
+};
+
+struct hash {
+  u8 hash[32];
+};
+
+struct signed_checksum32_ed25519 {
+  u8 checksum[32];
+  u64 length IN [ 1..128 ];
+  u8 identifier[length];
+  u8 signature[64];
+  u8 namespace[32];
+};
+
+struct entries_v1 {
+  u64 magic IN [ MAGIC_V1 ];
+  u64 format IN [ T_ENTRIES_V1 ];
+  u64 n_items;
+  struct signed_checksum32_ed25519 checksums[n_items];
+};
+
 struct inclusion_proof_v1 {
+  u64 magic IN [ MAGIC_V1 ];
   u64 format IN [ T_INCLUSION_PROOF_V1 ];
-  struct ed25519_v1 identifier;
+  u8 identifier[32];
   u64 tree_size;
   u64 leaf_index;
-  u64 length; /* TODO: constraint: multiple of 32 */
-  u8 hashes[length];  
+  u64 n_items;
+  struct hash hashes[n_items];
 };
 
 struct consistency_proof_v1 {
+  u64 magic IN [ MAGIC_V1 ];
   u64 format IN [ T_CONSISTENCY_PROOF_V1 ];
-  struct ed25519_v1 identifier;
+  u8 identifier[32];
   u64 old_size;
   u64 new_size;
-  u64 length; /* TODO: constraint: multiple of 32 */
-  u8 hashes[length];  
+  u64 n_items;
+  struct hash hashes[n_items];
 };
 
-/* Not used
-struct sigident {
-  u8 signature[64];
-  struct ed25519_v1 identifier;
-}; */
-
 struct signed_tree_head_v1 {
+  u64 magic IN [ MAGIC_V1 ];
   u64 format IN [ T_SIGNED_TREE_HEAD_V1 ];
   u64 timestamp;
   u64 tree_size;
   u8 root_hash[32];
-  u64 length; /* TODO: constraint: multiple of 104 */
-  u8 sigident[length];
-  /* Alternatively, if we would chose to replace length with n_items:
   u64 n_items;
-  struct sigident[n_items]; */
-};
-
-struct signed_checksum32_ed25519_v1 {
-  u64 format IN [ T_SIGNED_CHECKSUM32_ED25519_V1 ];
-  u8 checksum[32];
-  u64 length IN [ 1..127 ]; /* The spec contradicts itself on this point -- is it 127 or 128? */
-  u8 identifier[length];
-  u8 signature[64];
-  struct ed25519_v1 namespace;  
-};
-
-struct ed25519_v1 {
-  u64 format IN [ T_ED25519_V1 ];
-  u8 pubkey[32];
+  struct sigident_ed25519 signatures[n_items];
 };
 
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