Squashed 'external/toxcore/c-toxcore/' changes from 640e6cace..e58eb27a8

e58eb27a8 fix(toxav): remove extra copy of video frame on encode Tested and works, but there might be alignment issues and other stuff.
206ea3530 refactor: Explicitly pass dependencies to constructors.
7cefa93cf fix(toxencryptsave): Wipe salt and passkey after usage.
7c3be2342 refactor: Add file/line to tox-bootstrapd logging.
f84e8cdce refactor: Move loglogdata out of network.c.
390f7db06 refactor: Move random and memory OS-specifics to `os_*` files.
REVERT: 640e6cace fix(toxav): remove extra copy of video frame on encode Tested and works, but there might be alignment issues and other stuff.

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: e58eb27a84f9fa0cd996868e079f39e90a5c04b6

toxcore/tox_random_impl.h

@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later
+ * Copyright © 2022-2025 The TokTok team.
+ */
+
+#ifndef C_TOXCORE_TOXCORE_TOX_RANDOM_IMPL_H
+#define C_TOXCORE_TOXCORE_TOX_RANDOM_IMPL_H
+
+#include "tox_memory.h"
+#include "tox_random.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @brief Fill a byte array with random bytes.
+ *
+ * This is the key generator callback and as such must be a cryptographically
+ * secure pseudo-random number generator (CSPRNG). The security of Tox heavily
+ * depends on the security of this RNG.
+ */
+typedef void tox_random_bytes_cb(void *self, uint8_t *bytes, uint32_t length);
+
+/** @brief Generate a random integer between 0 and @p upper_bound.
+ *
+ * Should produce a uniform random distribution, but Tox security does not
+ * depend on this being correct. In principle, it could even be a non-CSPRNG.
+ */
+typedef uint32_t tox_random_uniform_cb(void *self, uint32_t upper_bound);
+
+/** @brief Virtual function table for Random. */
+struct Tox_Random_Funcs {
+    tox_random_bytes_cb *bytes_callback;
+    tox_random_uniform_cb *uniform_callback;
+};
+
+/** @brief Random number generator object.
+ *
+ * Can be used by test code and fuzzers to make toxcore behave in specific
+ * well-defined (non-random) ways. Production code ought to use libsodium's
+ * CSPRNG and use `os_random` below.
+ */
+struct Tox_Random {
+    const Tox_Random_Funcs *funcs;
+    void *user_data;
+
+    const Tox_Memory *mem;
+};
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* C_TOXCORE_TOXCORE_TOX_RANDOM_IMPL_H */