1 files changed, 66 insertions, 0 deletions
diff --git a/src/core/rng.h b/src/core/rng.h
new file mode 100644
index 000000000..f8b9a7f62
--- /dev/null
+++ b/src/core/rng.h
@@ -0,0 +1,66 @@
+/*************************************************
+* RandomNumberGenerator Header File              *
+* (C) 1999-2008 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_RANDOM_NUMBER_GENERATOR__
+#define BOTAN_RANDOM_NUMBER_GENERATOR__
+
+#include <botan/exceptn.h>
+
+namespace Botan {
+
+/*************************************************
+* Entropy Source                                 *
+*************************************************/
+class BOTAN_DLL EntropySource
+   {
+   public:
+      virtual u32bit slow_poll(byte[], u32bit) = 0;
+      virtual u32bit fast_poll(byte[], u32bit);
+      virtual ~EntropySource() {}
+   };
+
+/*************************************************
+* Random Number Generator                        *
+*************************************************/
+class BOTAN_DLL RandomNumberGenerator
+   {
+   public:
+      static RandomNumberGenerator* make_rng();
+
+      virtual void randomize(byte[], u32bit) = 0;
+      virtual bool is_seeded() const = 0;
+      virtual void clear() throw() = 0;
+
+      byte next_byte();
+
+      virtual void reseed() {}
+      virtual void add_entropy_source(EntropySource*) = 0;
+      virtual void add_entropy(const byte[], u32bit) = 0;
+
+      RandomNumberGenerator() {}
+      virtual ~RandomNumberGenerator() {}
+   private:
+      RandomNumberGenerator(const RandomNumberGenerator&) {}
+      RandomNumberGenerator& operator=(const RandomNumberGenerator&)
+         { return (*this); }
+   };
+
+/*************************************************
+* Null Random Number Generator                   *
+*************************************************/
+class BOTAN_DLL Null_RNG : public RandomNumberGenerator
+   {
+   public:
+      void randomize(byte[], u32bit) { throw PRNG_Unseeded("Null_RNG"); }
+      void clear() throw() {};
+
+      bool is_seeded() const { return false; }
+      void add_entropy(const byte[], u32bit) {}
+      void add_entropy_source(EntropySource* es) { delete es; }
+   };
+
+}
+
+#endif