tree 9bbd81a6fddbd3969c2cb70482732b475c8ced9c
parent c7041e70b37c0a035c98ce02a772e988e860112b
author Miguel Osorio <miguelosorio@google.com> 1618541174 -0700
committer moidx <migue48@gmail.com> 1619119500 -0700

[sw/dif] Introduce the EDN header.

dif_edn.h implements the interface for the Entropy Distribution Network
(EDN) device.

EDN supports two modes of operation:

 - boot-time: EDN configures the associated CSRNG instance to fetch pre-FIPS
   entropy immediately at boot-time or after reset.
 - auto refresh: EDN sends reseed and generate commands to the associated
   CSRNG instance. The API allows the user to set the CSRNG instantiate,
   reseed and generate para meters, as well as the reseed frequency.

Common set of operations for both boot-time and auto refresh modes:

  - `dif_edn_init()`
  - `dif_edn_configure()`

Order of operations in boot-time request mode:

  - `did_edn_boot_mode_start()`
  - `dif_edn_stop()`

Order of operations in auto refresh mode:

  - `dif_edn_auto_mode_start()`
  - `dif_edn_stop()`

Remaining work:

 - Add error status interface.

Signed-off-by: Miguel Osorio <miguelosorio@google.com>