3DS custom RNG for libsodium

Source/platform/ctr/random.cpp

@@ -0,0 +1,48 @@
+#include <sys/types.h>
+#include <sodium.h>
+#include <3ds.h>
+
+static const char *randombytes_ctrrandom_implementation_name()
+{
+	return "ctrrandom";
+}
+
+static bool randombytes_ctrrandom_tryfill(void *const buf, const size_t size)
+{
+	Result res;
+	if (!psGetSessionHandle()) {
+		res = psInit();
+		if (!R_SUCCEEDED(res))
+			return false;
+	}
+	res = PS_GenerateRandomBytes(buf, size);
+	return R_SUCCEEDED(res);
+}
+
+static uint32_t randombytes_ctrrandom()
+{
+	uint32_t num;
+	if (!randombytes_ctrrandom_tryfill(&num, sizeof(uint32_t)))
+		sodium_misuse();
+	return num;
+}
+
+static void randombytes_ctrrandom_buf(void *const buf, const size_t size)
+{
+	if (!randombytes_ctrrandom_tryfill(buf, size))
+		sodium_misuse();
+}
+
+struct randombytes_implementation randombytes_ctrrandom_implementation = {
+	randombytes_ctrrandom_implementation_name,
+	randombytes_ctrrandom,
+	nullptr,
+	nullptr,
+	randombytes_ctrrandom_buf,
+	nullptr
+};
+
+void randombytes_ctrrandom_init()
+{
+	randombytes_set_implementation(&randombytes_ctrrandom_implementation);
+}

Source/platform/ctr/random.hpp

@@ -0,0 +1,2 @@
+#pragma once
+void randombytes_ctrrandom_init();