[Bug 46471] amd k10 keepass2 dotnet472 divide by zero in encryption

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46471

--- Comment #3 from Hans Leidekker <hans at meelstraat.net> ---
(In reply to noabody from comment #0)
> Created attachment 63291 [details]
> divide by zero 64-bit .wine prefix
> 
> This is clearly an issue with decryption mechanisms that touch nettle/gnutls
> and the internal wine bcrypt implementation.  Although I cannot prove it,
> the indication is that recent changes require a processor with SSE4.1
> instruction set.

The AES fallback implementation is broken in libgnutls. The question is why it
is used on your system. There are several accelerated implementations, one of
which uses the SSE3 instruction set.

How was your gnutls package built? Make sure it's not built without hardware
acceleration support (enabled by default).

It could also be a problem with runtime detection of CPU capabilities. You can
try overriding it by setting the GNUTLS_CPUID_OVERRIDE environment variable:

    0x1: Disable all run-time detected optimizations
    0x2: Enable AES-NI
    0x4: Enable SSSE3
    0x8: Enable PCLMUL
    0x10: Enable AVX
    0x100000: Enable VIA padlock
    0x200000: Enable VIA PHE
    0x400000: Enable VIA PHE SHA512 

E.g. GNUTLS_CPUID_OVERRIDE=0x4 wine /path/to/keepass2.exe

Does that make a difference?

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