Add Stateful_RNG

Handles fork checking for HMAC_RNG and HMAC_DRBG

AutoSeeded_RNG change - switch to HMAC_DRBG as default.

Start removing the io buffer from entropy poller.

Update default RNG poll bits to 256.

Fix McEliece test, was using wrong RNG API.

Update docs.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/lib/rng/hmac_drbg/hmac_drbg.h b/src/lib/rng/hmac_drbg/hmac_drbg.h
index f52ae9de1..8ee598470 100644
--- a/src/lib/rng/hmac_drbg/hmac_drbg.h
+++ b/src/lib/rng/hmac_drbg/hmac_drbg.h
@@ -19,10 +19,14 @@ namespace Botan {
 class BOTAN_DLL HMAC_DRBG final : public Stateful_RNG
    {
    public:
-      HMAC_DRBG(const std::string& hmac_hash);
-
+      /**
+      * Initialize an HMAC_DRBG instance with the given hash function
+      */
       HMAC_DRBG(const std::string& hmac_hash,
-                size_t max_bytes_before_reseed);
+                size_t max_bytes_before_reseed = BOTAN_RNG_MAX_OUTPUT_BEFORE_RESEED);
+
+      HMAC_DRBG(MessageAuthenticationCode* hmac,
+                size_t max_bytes_before_reseed = BOTAN_RNG_MAX_OUTPUT_BEFORE_RESEED);
 
       std::string name() const override;