[v2,0/2] hw/misc/aspeed_hace: Fix SG Accumulative Hash Calculations

Message

Alejandro Zeise July 29, 2024, 7 p.m. UTC

The goal of this patch series is to fix accumulative hashing support in the 
Aspeed HACE module. The issue that stemmed this patch was a failure to boot an
OpenBMC image using the "ast2600-evb" machine. The U-boot
2019.04 loader failed to verify image hashes.

These incorrect image hashes given by the HACE to the U-boot guest are due to 
an oversight in the HACE module. Previously when operating in 
scatter-gather accumulative mode, the HACE would cache the address provided by 
the guest which contained the source data. However, there was no deep copy, 
so when HACE generated the digest upon the reception of the final accumulative chunk 
the digest was incorrect, as the addresses provided had their regions overwritten
by that time.

This fix consists of two main steps:
* Add an accumulative hashing function to the qcrypto library
* Modify the HACE module to use the accumulative hashing functions

All the crypto library backends (nettle, gnutls, etc.) support accumulative hashing,
so it was trivial to create wrappers for those functions.

Changes in V2:
* Fixed error checking bug in libgcrypt crypto backend of
  accumulate_bytesv


Alejandro Zeise (2):
  crypto: add support for accumulative hashing
  hw/misc/aspeed_hace: Fix SG Accumulative hashing

 crypto/hash-gcrypt.c          | 105 ++++++++++++++++++++++++++++++++++
 crypto/hash-glib.c            |  89 ++++++++++++++++++++++++++++
 crypto/hash-gnutls.c          |  82 ++++++++++++++++++++++++++
 crypto/hash-nettle.c          |  93 ++++++++++++++++++++++++++++++
 crypto/hash.c                 |  42 ++++++++++++++
 crypto/hashpriv.h             |  11 ++++
 hw/misc/aspeed_hace.c         |  91 +++++++++++++++--------------
 include/crypto/hash.h         |  65 +++++++++++++++++++++
 include/hw/misc/aspeed_hace.h |   4 ++
 9 files changed, 538 insertions(+), 44 deletions(-)