Is OpenSSL AES-NI not available in pgcrypto?

Hi all,

A question, may I wrong.

I've a Rocky Linux 8 with OpenSSL 1.1.1 FIPS  and Intel cpu with aes 
support (cat /proc/cpuinfo | grep aes)

Test made with openssl gives me a huge performance with aes enabled vs not:

"openssl speed -elapsed -evp aes-128-cbc" is about 5 time faster than 
"openssl speed -elapsed aes-128-cbc" or another "software calculated 
test", eg. "openssl speed -elapsed bf-cbc"

So OpenSSL is ok.

Postgresql 15 is compiled with openssl:

select name, setting from pg_settings where name = 'ssl_library';
     name     | setting
-------------+---------
  ssl_library | OpenSSL
(1 row)

So, a test with pgcrypto:

select pgp_sym_encrypt(data::text, 'pwd') --default to aes128
from generate_series('2022-01-01'::timestamp, '2022-12-31'::timestamp, 
'1 hour'::interval) data

vs

select pgp_sym_encrypt(data::text, 'pwd','cipher-algo=bf') -- blowfish
from generate_series('2022-01-01'::timestamp, '2022-12-31'::timestamp, 
'1 hour'::interval) data

In my test both queries execution is similar....aes-128 was expected 
about  5 time faster.

So, why?

Pgcrypto use OpenSSL as backend, so, does it explicit force software aes 
calculation instead of AES-NI cpu ones?

Thanksfor support.

Best regards,

Agharta