diff options
Diffstat (limited to 'src/lib/rng/rng.h')
| -rw-r--r-- | src/lib/rng/rng.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/lib/rng/rng.h b/src/lib/rng/rng.h index ec8557477..db42c8cf7 100644 --- a/src/lib/rng/rng.h +++ b/src/lib/rng/rng.h @@ -42,6 +42,15 @@ class BOTAN_PUBLIC_API(2,0) RandomNumberGenerator virtual void randomize(uint8_t output[], size_t length) = 0; /** + * Returns false if it is known that this RNG object is not able to accept + * externally provided inputs (via add_entropy, randomize_with_input, etc). + * In this case, any such provided inputs are ignored. + * + * If this function returns true, then inputs may or may not be accepted. + */ + virtual bool accepts_input() const = 0; + + /** * Incorporate some additional data into the RNG state. For * example adding nonces or timestamps from a peer's protocol * message can help hedge against VM state rollback attacks. @@ -190,6 +199,8 @@ class BOTAN_PUBLIC_API(2,0) Null_RNG final : public RandomNumberGenerator public: bool is_seeded() const override { return false; } + bool accepts_input() const override { return false; } + void clear() override {} void randomize(uint8_t[], size_t) override @@ -217,6 +228,12 @@ class BOTAN_PUBLIC_API(2,0) Serialized_RNG final : public RandomNumberGenerator m_rng->randomize(out, len); } + bool accepts_input() const override + { + lock_guard_type<mutex_type> lock(m_mutex); + return m_rng->accepts_input(); + } + bool is_seeded() const override { lock_guard_type<mutex_type> lock(m_mutex); |