Re: Re: cryptest fails, but only when redirecting output to a file

On Thu, Mar 18, 2021 at 12:24 PM Bart Vandewoestyne
<[email protected]> wrote:
>
> OK... and it seems like MASM_RDSEED_GenerateBlock is a function written in assembler in rdrand.asm.
>
> Since my assembler knowledge is very limited, I'm lost here.  So it looks like the fact that I'm running this using VS2019 causes that assembler code to throw an exception or something?
>
> Will try again with VS2015 and see if I have the same problem there...

Throwing an exception is expected if RDRAND or RDSEED is not
available. It is the reason for the try/catch block at
https://github.com/weidai11/cryptopp/blob/master/validat3.cpp#L827.

bool TestRDRAND()
{
    std::cout << "\nTesting RDRAND generator...\n\n";

    bool pass = true;
    member_ptr<RandomNumberGenerator> rng;

    try {rng.reset(new RDRAND);}
    catch (const RDRAND_Err &) {}

    if (rng.get())
    {
        // Test generator
    }

    return pass;
}

TestRDSEED() does the same thing.

The RDRAND exception is raised at
https://github.com/weidai11/cryptopp/blob/master/rdrand.cpp#L102. The
RDSEED exception is raised at
https://github.com/weidai11/cryptopp/blob/master/rdrand.cpp#L212.

Jeff

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