1 files changed, 95 insertions, 0 deletions
diff --git a/old/botan/src/entropy/entropy_src.h b/old/botan/src/entropy/entropy_src.h
new file mode 100644
index 0000000..a1a53fa
--- /dev/null
+++ b/old/botan/src/entropy/entropy_src.h
@@ -0,0 +1,95 @@
+/**
+* EntropySource
+* (C) 2008-2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ENTROPY_SOURCE_BASE_H__
+#define BOTAN_ENTROPY_SOURCE_BASE_H__
+
+#include <botan/buf_comp.h>
+#include <string>
+#include <utility>
+
+namespace Botan {
+
+/**
+* Class used to accumulate the poll results of EntropySources
+*/
+class Entropy_Accumulator
+   {
+   public:
+      Entropy_Accumulator(u32bit goal) :
+         entropy_goal(goal), collected_bits(0) {}
+
+      virtual ~Entropy_Accumulator() {}
+
+      /**
+      @return cached I/O buffer for repeated polls
+      */
+      MemoryRegion<byte>& get_io_buffer(u32bit size)
+         { io_buffer.create(size); return io_buffer; }
+
+      u32bit bits_collected() const
+         { return static_cast<u32bit>(collected_bits); }
+
+      bool polling_goal_achieved() const
+         { return (collected_bits >= entropy_goal); }
+
+      u32bit desired_remaining_bits() const
+         {
+         if(collected_bits >= entropy_goal)
+            return 0;
+         return static_cast<u32bit>(entropy_goal - collected_bits);
+         }
+
+      void add(const void* bytes, u32bit length, double entropy_bits_per_byte)
+         {
+         add_bytes(reinterpret_cast<const byte*>(bytes), length);
+         collected_bits += entropy_bits_per_byte * length;
+         }
+
+      template<typename T>
+      void add(const T& v, double entropy_bits_per_byte)
+         {
+         add(&v, sizeof(T), entropy_bits_per_byte);
+         }
+   private:
+      virtual void add_bytes(const byte bytes[], u32bit length) = 0;
+
+      SecureVector<byte> io_buffer;
+      u32bit entropy_goal;
+      double collected_bits;
+   };
+
+class Entropy_Accumulator_BufferedComputation : public Entropy_Accumulator
+   {
+   public:
+      Entropy_Accumulator_BufferedComputation(BufferedComputation& sink,
+                                              u32bit goal) :
+         Entropy_Accumulator(goal), entropy_sink(sink) {}
+
+   private:
+      virtual void add_bytes(const byte bytes[], u32bit length)
+         {
+         entropy_sink.update(bytes, length);
+         }
+
+      BufferedComputation& entropy_sink;
+   };
+
+/**
+* Abstract interface to a source of (hopefully unpredictable) system entropy
+*/
+class BOTAN_DLL EntropySource
+   {
+   public:
+      virtual std::string name() const = 0;
+      virtual void poll(Entropy_Accumulator& accum) = 0;
+      virtual ~EntropySource() {}
+   };
+
+}
+
+#endif