Add interfaces for add_entropy_source and add_entropy to

RandomNumberGenerator, and make ANSI_X931_PRNG's implementations just
forward the arguments to the underlying RNG. This allows seeding the RNG
even if no entropy modules are loaded into the library. Also it allows
actually adding user-specified data; to do it otherwise would require
creating the RNG objects yourself and retaining a pointer to the Randpool,
which is pretty bogus.

Move Null_RNG to rng.h

1 files changed, 16 insertions, 0 deletions

diff --git a/src/x931_rng.cpp b/src/x931_rng.cpp
index 68d633df4..8f454dcb8 100644
--- a/src/x931_rng.cpp
+++ b/src/x931_rng.cpp
@@ -70,6 +70,22 @@ void ANSI_X931_RNG::reseed()
    }
 
 /*************************************************
+* Add a entropy source to the underlying PRNG    *
+*************************************************/
+void ANSI_X931_RNG::add_entropy_source(EntropySource* src)
+   {
+   prng->add_entropy_source(src);
+   }
+
+/*************************************************
+* Add some entropy to the underlying PRNG        *
+*************************************************/
+void ANSI_X931_RNG::add_entropy(const byte input[], u32bit length)
+   {
+   prng->add_entropy(input, length);
+   }
+
+/*************************************************
 * Check if the the PRNG is seeded                *
 *************************************************/
 bool ANSI_X931_RNG::is_seeded() const