Use serde-indexed to save space

Cargo.toml

@@ -17,6 +17,7 @@ hmac = "0.12.1"
 rand_core = "0.6.4"
 serde = { version = "1", default-features = false }
 serde-byte-array = "0.1.2"
+serde-indexed = "0.1.0"
 sha2 = { version = "0.10.6", default-features = false }
 subtle = { version = "2.4.1", default-features = false }
 trussed = { version = "0.1.0", features = ["serde-extensions"] }
@@ -27,5 +28,7 @@ rand_core = { version = "0.6.4", default-features = false, features = ["getrando
 trussed = { version = "0.1.0", features = ["serde-extensions", "virt"] }
 
 [patch.crates-io]
-littlefs2 = { git =  "https://github.com/Nitrokey/littlefs2", tag = "v0.3.2-nitrokey-2" }
-trussed = { git = "https://github.com/trussed-dev/trussed.git", rev = "df720980888e3e0d5487250bd14a28db02a5f13b" }
+littlefs2 = { git = "https://github.com/trussed-dev/littlefs2", rev = "ebd27e49ca321089d01d8c9b169c4aeb58ceeeca" }
+trussed = { git = "https://github.com/Nitrokey/trussed.git", tag = "v0.1.0-nitrokey.17" }
+serde-indexed = { git = "https://github.com/nitrokey/serde-indexed.git", rev = "37ba220526961fb8ba067d3fa18ee620337bb73b" }
+cbor-smol = { git = "https://github.com/sosthene-nitrokey/cbor-smol.git", rev = "327f723d53263d4ac1da368660de4fe4aa8ebef8" }

src/backend/data.rs

@@ -106,19 +106,20 @@ pub(crate) type Key = ByteArray<KEY_LEN>;
 ///     to_presistent_storage(salt, wrapped_key);
 /// }
 /// ````
-#[derive(Debug, Deserialize, Serialize)]
+#[derive(Debug, Deserialize, serde_indexed::SerializeIndexed)]
 struct WrappedKeyData {
     wrapped_key: Key,
     tag: ChaChaTag,
 }
 
+// No need for using SerializeIndexed, cbor_smol already does it for enums
 #[derive(Debug, Deserialize, Serialize)]
 enum KeyOrHash {
     Key(WrappedKeyData),
     Hash(Hash),
 }
 
-#[derive(Debug, Deserialize, Serialize)]
+#[derive(Debug, Deserialize, serde_indexed::SerializeIndexed)]
 pub(crate) struct PinData {
     #[serde(skip)]
     id: PinId,