Change X9.31 to automatically reseed if randomize is called while unseeded.

If no entropy sources at all are enabled in the build, throw an exception
immediately rather than having the poll mysteriously fail.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/lib/rng/x931_rng/x931_rng.cpp b/src/lib/rng/x931_rng/x931_rng.cpp
index dbf09b367..a77ac2ca8 100644
--- a/src/lib/rng/x931_rng/x931_rng.cpp
+++ b/src/lib/rng/x931_rng/x931_rng.cpp
@@ -14,7 +14,12 @@ namespace Botan {
 void ANSI_X931_RNG::randomize(byte out[], size_t length)
    {
    if(!is_seeded())
-      throw PRNG_Unseeded(name());
+      {
+      reseed(BOTAN_RNG_RESEED_POLL_BITS);
+
+      if(!is_seeded())
+         throw PRNG_Unseeded(name());
+      }
 
    while(length)
       {