Move rng.{cpp,h} from core to rng/ topdir

Add a new class AutoSeeded_RNG that is a RandomNumberGenerator that wraps
up the logic formerly in RandomNumberGenerator::make_rng. make_rng in
fact now just returns a new AutoSeeded_RNG object.

AutoSeeded_RNG is a bit more convenient because

- No need to use auto_ptr
- No need to dereference (same syntax everywhere - it's an underestimated
advantage imo)

Also move the code from timer/timer_base to timer/

3 files changed, 189 insertions, 0 deletions

diff --git a/src/rng/auto_rng/auto_rng.cpp b/src/rng/auto_rng/auto_rng.cpp
new file mode 100644
index 000000000..076630f6d
--- /dev/null
+++ b/src/rng/auto_rng/auto_rng.cpp
@@ -0,0 +1,129 @@
+/*************************************************
+* Auto Seeded RNG Source File                    *
+* (C) 2008 Jack Lloyd                            *
+*************************************************/
+
+#include <botan/auto_rng.h>
+#include <botan/randpool.h>
+#include <botan/parsing.h>
+#include <botan/timers.h>
+#include <botan/aes.h>
+#include <botan/hmac.h>
+#include <botan/sha2_32.h>
+
+#if defined(BOTAN_HAS_X931_RNG)
+  #include <botan/x931_rng.h>
+#endif
+
+#if defined(BOTAN_HAS_TIMER_HARDWARE)
+  #include <botan/tm_hard.h>
+#elif defined(BOTAN_HAS_TIMER_POSIX)
+  #include <botan/tm_posix.h>
+#elif defined(BOTAN_HAS_TIMER_UNIX)
+  #include <botan/tm_unix.h>
+#elif defined(BOTAN_HAS_TIMER_WIN32)
+  #include <botan/tm_win32.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_DEVICE)
+  #include <botan/es_dev.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
+  #include <botan/es_egd.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX)
+  #include <botan/es_unix.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
+  #include <botan/es_beos.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
+  #include <botan/es_capi.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
+  #include <botan/es_win32.h>
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
+  #include <botan/es_ftw.h>
+#endif
+
+namespace Botan {
+
+namespace {
+
+/**
+* Add any known entropy sources to this RNG
+*/
+void add_entropy_sources(RandomNumberGenerator* rng)
+   {
+#if defined(BOTAN_HAS_TIMER_HARDWARE)
+   rng->add_entropy_source(new Hardware_Timer);
+#elif defined(BOTAN_HAS_TIMER_POSIX)
+   rng->add_entropy_source(new POSIX_Timer);
+#elif defined(BOTAN_HAS_TIMER_UNIX)
+   rng->add_entropy_source(new Unix_Timer);
+#elif defined(BOTAN_HAS_TIMER_WIN32)
+   rng->add_entropy_source(new Win32_Timer);
+#else
+   rng->add_entropy_source(new Timer);
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_DEVICE)
+   rng->add_entropy_source(
+      new Device_EntropySource(
+         split_on("/dev/random:/dev/srandom:/dev/urandom", ':')
+         )
+      );
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
+   rng->add_entropy_source(
+      new EGD_EntropySource(split_on("/var/run/egd-pool:/dev/egd-pool", ':'))
+      );
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
+   rng->add_entropy_source(new Win32_CAPI_EntropySource);
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
+   rng->add_entropy_source(new Win32_EntropySource);
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX)
+   rng->add_entropy_source(
+      new Unix_EntropySource(split_on("/bin:/sbin:/usr/bin:/usr/sbin", ':'))
+      );
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
+   rng->add_entropy_source(new BeOS_EntropySource);
+#endif
+
+#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
+   rng->add_entropy_source(new FTW_EntropySource("/proc"));
+#endif
+   }
+
+}
+
+AutoSeeded_RNG::AutoSeeded_RNG()
+   {
+   /* Randpool is required for make_rng to work */
+   rng = new Randpool(new AES_256, new HMAC(new SHA_256));
+
+   /* If X9.31 is available, wrap the Randpool algorithm in it */
+#if defined(BOTAN_HAS_X931_RNG)
+   rng = new ANSI_X931_RNG(new AES_256, rng);
+#endif
+
+   add_entropy_sources(rng);
+   }
+
+}
diff --git a/src/rng/auto_rng/auto_rng.h b/src/rng/auto_rng/auto_rng.h
new file mode 100644
index 000000000..bbc3703c1
--- /dev/null
+++ b/src/rng/auto_rng/auto_rng.h
@@ -0,0 +1,42 @@
+/*************************************************
+* Auto Seeded RNG Header File                    *
+* (C) 2008 Jack Lloyd                            *
+*************************************************/
+
+#ifndef BOTAN_AUTO_SEEDING_RNG_H__
+#define BOTAN_AUTO_SEEDING_RNG_H__
+
+#include <botan/rng.h>
+#include <botan/base.h>
+
+namespace Botan {
+
+/**
+* RNG that attempts to seed itself
+*/
+class BOTAN_DLL AutoSeeded_RNG : public RandomNumberGenerator
+   {
+   public:
+      void randomize(byte out[], u32bit len)
+         { rng->randomize(out, len); }
+      bool is_seeded() const
+         { return rng->is_seeded(); }
+      void clear() throw() { rng->clear(); }
+      std::string name() const
+         { return "AutoSeeded(" + rng->name() + ")"; }
+
+      void reseed() { rng->reseed(); }
+      void add_entropy_source(EntropySource* es)
+         { rng->add_entropy_source(es); }
+      void add_entropy(const byte in[], u32bit len)
+         { rng->add_entropy(in, len); }
+
+      AutoSeeded_RNG();
+      ~AutoSeeded_RNG() { delete rng; }
+   private:
+      RandomNumberGenerator* rng;
+   };
+
+}
+
+#endif
diff --git a/src/rng/auto_rng/info.txt b/src/rng/auto_rng/info.txt
new file mode 100644
index 000000000..c2b653220
--- /dev/null
+++ b/src/rng/auto_rng/info.txt
@@ -0,0 +1,18 @@
+realname "Auto-seeded Random Number Generator"
+
+define AUTO_SEEDING_RNG
+
+load_on auto
+
+<requires>
+randpool
+aes
+sha2
+hmac
+</requires>
+
+<add>
+auto_rng.h
+auto_rng.cpp
+</add>
+