1 files changed, 102 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/rng/auto_rng/auto_rng.h b/comm/third_party/botan/src/lib/rng/auto_rng/auto_rng.h
new file mode 100644
index 0000000000..8cb2c4a127
--- /dev/null
+++ b/comm/third_party/botan/src/lib/rng/auto_rng/auto_rng.h
@@ -0,0 +1,102 @@
+/*
+* Auto Seeded RNG
+* (C) 2008,2016 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_AUTO_SEEDING_RNG_H_
+#define BOTAN_AUTO_SEEDING_RNG_H_
+
+#include <botan/rng.h>
+
+namespace Botan {
+
+class Stateful_RNG;
+
+/**
+* A userspace PRNG
+*/
+class BOTAN_PUBLIC_API(2,0) AutoSeeded_RNG final : public RandomNumberGenerator
+   {
+   public:
+      void randomize(uint8_t out[], size_t len) override;
+
+      void randomize_with_input(uint8_t output[], size_t output_len,
+                                const uint8_t input[], size_t input_len) override;
+
+      bool is_seeded() const override;
+
+      bool accepts_input() const override { return true; }
+
+      /**
+      * Mark state as requiring a reseed on next use
+      */
+      void force_reseed();
+
+      size_t reseed(Entropy_Sources& srcs,
+                    size_t poll_bits = BOTAN_RNG_RESEED_POLL_BITS,
+                    std::chrono::milliseconds poll_timeout = BOTAN_RNG_RESEED_DEFAULT_TIMEOUT) override;
+
+      void add_entropy(const uint8_t in[], size_t len) override;
+
+      std::string name() const override;
+
+      void clear() override;
+
+      /**
+      * Uses the system RNG (if available) or else a default group of
+      * entropy sources (all other systems) to gather seed material.
+      *
+      * @param reseed_interval specifies a limit of how many times
+      * the RNG will be called before automatic reseeding is performed
+      */
+      AutoSeeded_RNG(size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
+
+      /**
+      * Create an AutoSeeded_RNG which will get seed material from some other
+      * RNG instance. For example you could provide a reference to the system
+      * RNG or a hardware RNG.
+      *
+      * @param underlying_rng is a reference to some RNG which will be used
+      * to perform the periodic reseeding
+      * @param reseed_interval specifies a limit of how many times
+      * the RNG will be called before automatic reseeding is performed
+      */
+      AutoSeeded_RNG(RandomNumberGenerator& underlying_rng,
+                     size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
+
+      /**
+      * Create an AutoSeeded_RNG which will get seed material from a set of
+      * entropy sources.
+      *
+      * @param entropy_sources will be polled to perform reseeding periodically
+      * @param reseed_interval specifies a limit of how many times
+      * the RNG will be called before automatic reseeding is performed
+      */
+      AutoSeeded_RNG(Entropy_Sources& entropy_sources,
+                     size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
+
+      /**
+      * Create an AutoSeeded_RNG which will get seed material from both an
+      * underlying RNG and a set of entropy sources.
+      *
+      * @param underlying_rng is a reference to some RNG which will be used
+      * to perform the periodic reseeding
+      * @param entropy_sources will be polled to perform reseeding periodically
+      * @param reseed_interval specifies a limit of how many times
+      * the RNG will be called before automatic reseeding is performed
+      */
+      AutoSeeded_RNG(RandomNumberGenerator& underlying_rng,
+                     Entropy_Sources& entropy_sources,
+                     size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
+
+      ~AutoSeeded_RNG();
+
+   private:
+      std::unique_ptr<Stateful_RNG> m_rng;
+   };
+
+}
+
+#endif