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kern: switch RNG to CTR-DBRG

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This commit is contained in:
Alula
2026-09-18 03:38:26 +02:00
parent 4e917d700f
commit 3cfac4c2d8
8 changed files with 229 additions and 73 deletions
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4
libraries/libmesosphere/include/mesosphere/board/nintendo/nx/kern_k_system_control.hpp
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@@ -51,9 +51,7 @@ namespace ams::kern::board::nintendo::nx {
static NOINLINE u32 GetCreateProcessMemoryPool();
/* Randomness. */
static void GenerateRandom(u64 *dst, size_t count);
static u64 GenerateRandomRange(u64 min, u64 max);
static u64 GenerateRandomU64();
static void GenerateRandomBytesForUninitialized(void *dst, size_t size);
/* Privileged Access. */
static void ReadWriteRegisterPrivileged(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value);

31
libraries/libmesosphere/include/mesosphere/kern_k_system_control_base.hpp
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@@ -33,17 +33,30 @@ namespace ams::kern {
class KResourceLimit;
struct CtrDrbgContext {
u8 v[16];
u8 key[16];
u8 seed[32];
u8 temp[32];
u32 reseed_counter;
u8 output[128];
u32 remaining;
};
class KSystemControlBase {
public:
/* This can be overridden as needed. */
static constexpr size_t SecureAppletMemorySize = 0;
protected:
/* Nintendo uses std::mt19937_t for randomness. */
/* To save space (and because mt19337_t isn't secure anyway), */
/* We will use TinyMT. */
static constinit inline bool s_uninitialized_random_generator{true};
static constinit inline util::TinyMT s_random_generator{util::ConstantInitialize};
static constinit inline KSpinLock s_random_lock;
static constinit inline bool s_uninitialized_random_generator{true};
static constinit inline CtrDrbgContext s_random_generator{};
static constinit inline KSpinLock s_random_lock;
private:
/* Randomness helpers. */
static void InitializeRandomGenerator(const void *seed, size_t size);
static void ReseedRandomGeneratorInternal();
static u32 GenerateRandomU32();
static u64 GenerateRandomU64Internal();
public:
class Init {
private:
@@ -66,7 +79,7 @@ namespace ams::kern {
static u64 GenerateRandomRange(u64 min, u64 max);
};
protected:
static NOINLINE void InitializePhase1Base(u64 seed);
static NOINLINE void InitializePhase1Base(const void *seed, size_t size);
public:
/* Initialization. */
static NOINLINE void ConfigureKTargetSystem();
@@ -78,6 +91,10 @@ namespace ams::kern {
static void GenerateRandom(u64 *dst, size_t count);
static u64 GenerateRandomRange(u64 min, u64 max);
static u64 GenerateRandomU64();
static void ReseedRandomGenerator();
/* Obtains random bytes while the generator is not yet initialized. Board-provided. */
static void GenerateRandomBytesForUninitialized(void *dst, size_t size);
/* Register access Access. */
static Result ReadWriteRegister(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value);