[openssl/openssl] 56f769: Add an EVP demo for CMAC

[Daniel Fiala]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.openssl.org/openssl/openssl
  Commit: 56f7697c70e539b18af0f17282caf58c76576d9e
      https://github.openssl.org/openssl/openssl/commit/56f7697c70e539b18af0f17282caf58c76576d9e
  Author: Daniel Fiala <daniel at openssl.org>
  Date:   2022-07-13 (Wed, 13 Jul 2022)

  Changed paths:
    M demos/mac/Makefile
    A demos/mac/cmac-aes256.c

  Log Message:
  -----------
  Add an EVP demo for CMAC

Fixes openssl#14110

Reviewed-by: Paul Dale <pauli at openssl.org>
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/18778)

(cherry picked from commit cdf0a5c46032ba4c39d93a7bec52494b4808830f)