New reseed_with_sources call on RNGs

Provides an easier way for an application to configure a list of
entropy sources they'd like to use, or add a custom entropy source to
their seeding.

Exposes some toggles for the global/default entropy sources to build.h

Adds basic entropy tests which runs the polls and does sanity checking
on the results, including compression tests if available. These are
less useful for the CSPRNG outputs but a good check for the ones
producing plain ASCII like the /proc reader.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/lib/rng/auto_rng/auto_rng.h b/src/lib/rng/auto_rng/auto_rng.h
index a7b28af92..ce0c5a7d2 100644
--- a/src/lib/rng/auto_rng/auto_rng.h
+++ b/src/lib/rng/auto_rng/auto_rng.h
@@ -25,7 +25,12 @@ class BOTAN_DLL AutoSeeded_RNG : public RandomNumberGenerator
 
       std::string name() const override { return m_rng->name(); }
 
-      void reseed(size_t poll_bits = 256) override { m_rng->reseed(poll_bits); }
+      size_t reseed_with_sources(Entropy_Sources& srcs,
+                               size_t poll_bits,
+                               std::chrono::milliseconds poll_timeout) override
+         {
+         return m_rng->reseed_with_sources(srcs, poll_bits, poll_timeout);
+         }
 
       void add_entropy(const byte in[], size_t len) override
          { m_rng->add_entropy(in, len); }