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How to check aes-ni are supported by the processor?

I am looking for a solution how to test aes-ni on CPU. I need to put this information into my application, so I'm not looking for any CPU-Z, bash or whatever commands. I know it displays as aes . I have no idea how to check this in assembly or c. The main application is written in C #, but that doesn't matter.

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2 answers


This information is returned by the command cpuid

. Go to eax=1

, and bit # 25 in will ecx

display support. See the intel instruction manual for more details. Sample code:

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


Alternatively, you can just try executing it and catch the exception.

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In Visual C ++



static bool GetNNICapability()
{
    unsigned int b;

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

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