[openssl/openssl] 281c6b: s390x: Fix keccak xofs via CPACF

[Juergen Christ]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: 281c6b4a7855a684751317de773c0fa5af0147e5
      https://github.com/openssl/openssl/commit/281c6b4a7855a684751317de773c0fa5af0147e5
  Author: Juergen Christ <jchrist at linux.ibm.com>
  Date:   2023-01-16 (Mon, 16 Jan 2023)

  Changed paths:
    M providers/implementations/digests/sha3_prov.c

  Log Message:
  -----------
  s390x: Fix keccak xofs via CPACF

CPACF does not directly support xofs.  Emulate this by using single block
operations on an empty input block.

Fixes: affc070aabc9 ("s390x: Optimize kmac")

Signed-off-by: Juergen Christ <jchrist at linux.ibm.com>

Reviewed-by: Shane Lontis <shane.lontis at oracle.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19983)

(cherry picked from commit 76aa4f3ac0d76e58f2111cbf87ae7f25c8766190)