How to check aes-ni are supported by CPU?

Question

I searching for solution, how to check aes-ni are available on CPU. I need to put this information in my application, so i'm not looking for any CPU-Z, bash commands or something. I know that it is seen as aes flag. I have no idea how to check it in assembly or c. Main application is written in C#, but it doesn't matter.

Related: http://unix.stackexchange.com/questions/14077/how-to-check-that-aes-ni-is-supported-by-my-cpu . On linux `/proc/cpuinfo` is as available to C as it is to bash, but this requires of course a unix system. — Maarten Bodewes, Nov 30 '14 at 01:34

score 4 · Accepted Answer · answered Nov 28 '14 at 18:26

4

This information is returned by the cpuid instruction. Pass in eax=1 and bit #25 in ecx will show support. See the intel instruction set reference for more details. Sample code:

mov eax, 1
cpuid
test ecx, 1<<25
jz no_aesni

Also, you might just try executing it and catch the exception.

answered Nov 28 '14 at 18:26

Jester

56,577
4
81
125

Thank you, i made it that way. – s3ven Nov 29 '14 at 12:37

score 2 · Answer 2 · answered Mar 31 '16 at 22:24

2

In visual C++

static bool GetNNICapability()
{
    unsigned int b;

    __asm
    {
        mov     eax, 1
        cpuid
        mov     b, ecx
    }

    return (b & (1 << 25)) != 0;
}

answered Mar 31 '16 at 22:24

JGU

879
12
14

How to check aes-ni are supported by CPU?

2 Answers2