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 +1,35 @@
+#if defined(CH32V30x_D8) || defined(CH32V30x_D8C)
+#    include <ch32v30x_rng.h>
+#else
+#    error CH32 implementation missing!
+#endif
+
+static int
+hydro_random_init(void)
+{
+    const char       ctx[hydro_hash_CONTEXTBYTES] = { 'h', 'y', 'd', 'r', 'o', 'P', 'R', 'G' };
+    hydro_hash_state st;
+    uint16_t         ebits = 0;
+
+    // Enable RNG clock source
+    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_RNG, ENABLE);
+
+    // RNG Peripheral enable
+    RNG_Cmd(ENABLE);
+
+    hydro_hash_init(&st, ctx, NULL);
+
+    while (ebits < 256) {
+        while (RNG_GetFlagStatus(RNG_FLAG_DRDY) == RESET)
+            ;
+        uint32_t r = RNG_GetRandomNumber();
+
+        hydro_hash_update(&st, (const uint32_t *) &r, sizeof r);
+        ebits += 32;
+    }
+
+    hydro_hash_final(&st, hydro_random_context.state, sizeof hydro_random_context.state);
+    hydro_random_context.counter = ~LOAD64_LE(hydro_random_context.state);
+
+    return 0;
+}