1 files changed, 87 insertions, 0 deletions
diff --git a/src/libs/3rdparty/botan/src/lib/entropy/entropy_src.h b/src/libs/3rdparty/botan/src/lib/entropy/entropy_src.h
new file mode 100644
index 0000000000..56e5bd53e5
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+++ b/src/libs/3rdparty/botan/src/lib/entropy/entropy_src.h
@@ -0,0 +1,87 @@
+/*
+* EntropySource
+* (C) 2008,2009,2014,2015,2016 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_ENTROPY_H_
+#define BOTAN_ENTROPY_H_
+
+#include <botan/secmem.h>
+#include <botan/rng.h>
+#include <string>
+#include <chrono>
+#include <memory>
+#include <vector>
+
+namespace Botan {
+
+class RandomNumberGenerator;
+
+/**
+* Abstract interface to a source of entropy
+*/
+class BOTAN_PUBLIC_API(2,0) Entropy_Source
+   {
+   public:
+      /**
+      * Return a new entropy source of a particular type, or null
+      * Each entropy source may require substantial resources (eg, a file handle
+      * or socket instance), so try to share them among multiple RNGs, or just
+      * use the preconfigured global list accessed by Entropy_Sources::global_sources()
+      */
+      static std::unique_ptr<Entropy_Source> create(const std::string& type);
+
+      /**
+      * @return name identifying this entropy source
+      */
+      virtual std::string name() const = 0;
+
+      /**
+      * Perform an entropy gathering poll
+      * @param rng will be provided with entropy via calls to add_entropy
+      * @return conservative estimate of actual entropy added to rng during poll
+      */
+      virtual size_t poll(RandomNumberGenerator& rng) = 0;
+
+      Entropy_Source() = default;
+      Entropy_Source(const Entropy_Source& other) = delete;
+      Entropy_Source(Entropy_Source&& other) = delete;
+      Entropy_Source& operator=(const Entropy_Source& other) = delete;
+
+      virtual ~Entropy_Source() = default;
+   };
+
+class BOTAN_PUBLIC_API(2,0) Entropy_Sources final
+   {
+   public:
+      static Entropy_Sources& global_sources();
+
+      void add_source(std::unique_ptr<Entropy_Source> src);
+
+      std::vector<std::string> enabled_sources() const;
+
+      size_t poll(RandomNumberGenerator& rng,
+                  size_t bits,
+                  std::chrono::milliseconds timeout);
+
+      /**
+      * Poll just a single named source. Ordinally only used for testing
+      */
+      size_t poll_just(RandomNumberGenerator& rng, const std::string& src);
+
+      Entropy_Sources() = default;
+      explicit Entropy_Sources(const std::vector<std::string>& sources);
+
+      Entropy_Sources(const Entropy_Sources& other) = delete;
+      Entropy_Sources(Entropy_Sources&& other) = delete;
+      Entropy_Sources& operator=(const Entropy_Sources& other) = delete;
+
+   private:
+      std::vector<std::unique_ptr<Entropy_Source>> m_srcs;
+   };
+
+}
+
+#endif