add encrypting for save files

add libhydrogen for encrypting and decrypting #9
2026-04-03 14:59:37 +02:00
parent abb6556fd4
commit c277ab10d9
68 changed files with 5737 additions and 74 deletions
@@ -0,0 +1,20 @@
+int
+hydro_kdf_derive_from_key(uint8_t *subkey, size_t subkey_len, uint64_t subkey_id,
+                          const char    ctx[hydro_kdf_CONTEXTBYTES],
+                          const uint8_t key[hydro_kdf_KEYBYTES])
+{
+    hydro_hash_state st;
+
+    COMPILER_ASSERT(hydro_kdf_CONTEXTBYTES >= hydro_hash_CONTEXTBYTES);
+    COMPILER_ASSERT(hydro_kdf_KEYBYTES >= hydro_hash_KEYBYTES);
+    if (hydro_hash_init_with_tweak(&st, ctx, subkey_id, key) != 0) {
+        return -1;
+    }
+    return hydro_hash_final(&st, subkey, subkey_len);
+}
+
+void
+hydro_kdf_keygen(uint8_t key[hydro_kdf_KEYBYTES])
+{
+    hydro_random_buf(key, hydro_kdf_KEYBYTES);
+}