incorrect instructions on wiki

[allanjude]

https://github.com/mdaxini/howto-openssl/wiki/OpenSSL-Cipher-Speed

The openssl manual notes: https://wiki.openssl.org/index.php/Manual:OPENSSL_ia32cap(3) OPENSSL_ia32cap: bit #33 denoting availability of PCLMULQDQ instruction; bit #57 denoting AES-NI instruction set extension;

Disabling both results in different performance between having AES-NI on and off in the BIOS.

The difference is not noticeable in aes-128-cbc, but is in other algorithms:

== Disable Both AES-NI and PCLMULQDQ ==

OPENSSL_ia32cap="~0x200000200000000" openssl speed -elapsed -evp aes-128-cbc

AES-NI ON: 363 MB/s AES-NI OFF: 363 MB/s

OPENSSL_ia32cap="~0x200000200000000" openssl speed -elapsed -evp aes-128-gcm

AES-NI ON: 260 MB/s AES-NI OFF: 260 MB/s

== Disabled only AES-NI ==

OPENSSL_ia32cap="~0x200000000000000" openssl speed -elapsed -evp aes-128-cbc

AES-NI ON: 363 MB/s AES-NI OFF: 363 MB/s

OPENSSL_ia32cap="~0x200000000000000" openssl speed -elapsed -evp aes-128-gcm

AES-NI ON: 516 MB/s AES-NI OFF: 516 MB/s

== Normal ==

openssl speed -elapsed -evp aes-128-cbc

AES-NI ON: 768 MB/s AES-NI OFF: 363 MB/s

openssl speed -elapsed -evp aes-128-gcm

AES-NI ON: 3315 MB/s AES-NI OFF: 516 MB/s

As you can see, under aes-128-gcm, disabling the additional instructions, rather than just AES-NI, cuts performance in half.