Move lib into src

1 files changed, 174 insertions, 0 deletions

diff --git a/src/lib/rng/rng.h b/src/lib/rng/rng.h
new file mode 100644
index 000000000..8664ccbf7
--- /dev/null
+++ b/src/lib/rng/rng.h
@@ -0,0 +1,174 @@
+/*
+* RandomNumberGenerator
+* (C) 1999-2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_RANDOM_NUMBER_GENERATOR_H__
+#define BOTAN_RANDOM_NUMBER_GENERATOR_H__
+
+#include <botan/entropy_src.h>
+#include <botan/exceptn.h>
+#include <string>
+#include <memory>
+#include <mutex>
+
+namespace Botan {
+
+/**
+* This class represents a random number (RNG) generator object.
+*/
+class BOTAN_DLL RandomNumberGenerator
+   {
+   public:
+      /**
+      * Create a seeded and active RNG object for general application use
+      * Added in 1.8.0
+      */
+      static RandomNumberGenerator* make_rng();
+
+      /**
+      * Create a seeded and active RNG object for general application use
+      * Added in 1.11.5
+      */
+      static std::unique_ptr<RandomNumberGenerator> make_rng(class Algorithm_Factory& af);
+
+      /**
+      * Randomize a byte array.
+      * @param output the byte array to hold the random output.
+      * @param length the length of the byte array output.
+      */
+      virtual void randomize(byte output[], size_t length) = 0;
+
+      /**
+      * Return a random vector
+      * @param bytes number of bytes in the result
+      * @return randomized vector of length bytes
+      */
+      secure_vector<byte> random_vec(size_t bytes)
+         {
+         secure_vector<byte> output(bytes);
+         randomize(&output[0], output.size());
+         return output;
+         }
+
+      /**
+      * Return a random byte
+      * @return random byte
+      */
+      byte next_byte()
+         {
+         byte out;
+         this->randomize(&out, 1);
+         return out;
+         }
+
+      /**
+      * Check whether this RNG is seeded.
+      * @return true if this RNG was already seeded, false otherwise.
+      */
+      virtual bool is_seeded() const = 0;
+
+      /**
+      * Clear all internally held values of this RNG.
+      */
+      virtual void clear() = 0;
+
+      /**
+      * Return the name of this object
+      */
+      virtual std::string name() const = 0;
+
+      /**
+      * Seed this RNG using the entropy sources it contains.
+      * @param bits_to_collect is the number of bits of entropy to
+               attempt to gather from the entropy sources
+      */
+      virtual void reseed(size_t bits_to_collect) = 0;
+
+      /**
+      * Add entropy to this RNG.
+      * @param in a byte array containg the entropy to be added
+      * @param length the length of the byte array in
+      */
+      virtual void add_entropy(const byte in[], size_t length) = 0;
+
+      /*
+      * Never copy a RNG, create a new one
+      */
+      RandomNumberGenerator(const RandomNumberGenerator& rng) = delete;
+      RandomNumberGenerator& operator=(const RandomNumberGenerator& rng) = delete;
+
+      RandomNumberGenerator() {}
+      virtual ~RandomNumberGenerator() {}
+   };
+
+/**
+* Null/stub RNG - fails if you try to use it for anything
+*/
+class BOTAN_DLL Null_RNG : public RandomNumberGenerator
+   {
+   public:
+      void randomize(byte[], size_t) override { throw PRNG_Unseeded("Null_RNG"); }
+
+      void clear() override {}
+
+      std::string name() const override { return "Null_RNG"; }
+
+      void reseed(size_t) override {}
+      bool is_seeded() const override { return false; }
+      void add_entropy(const byte[], size_t) override {}
+   };
+
+/**
+* Wraps access to a RNG in a mutex
+*/
+class BOTAN_DLL Serialized_RNG : public RandomNumberGenerator
+   {
+   public:
+      void randomize(byte out[], size_t len)
+         {
+         std::lock_guard<std::mutex> lock(m_mutex);
+         m_rng->randomize(out, len);
+         }
+
+      bool is_seeded() const
+         {
+         std::lock_guard<std::mutex> lock(m_mutex);
+         return m_rng->is_seeded();
+         }
+
+      void clear()
+         {
+         std::lock_guard<std::mutex> lock(m_mutex);
+         m_rng->clear();
+         }
+
+      std::string name() const
+         {
+         std::lock_guard<std::mutex> lock(m_mutex);
+         return m_rng->name();
+         }
+
+      void reseed(size_t poll_bits)
+         {
+         std::lock_guard<std::mutex> lock(m_mutex);
+         m_rng->reseed(poll_bits);
+         }
+
+      void add_entropy(const byte in[], size_t len)
+         {
+         std::lock_guard<std::mutex> lock(m_mutex);
+         m_rng->add_entropy(in, len);
+         }
+
+      Serialized_RNG() : m_rng(RandomNumberGenerator::make_rng()) {}
+   private:
+      mutable std::mutex m_mutex;
+      std::unique_ptr<RandomNumberGenerator> m_rng;
+   };
+
+}
+
+#endif