[openssl-users] Checking for AES-NI accelration

Jakob Bohm jb-openssl at wisemo.com
Wed Aug 10 17:20:59 UTC 2016

On 10/08/2016 19:02, Norm Green wrote:
> I've been wondering how and when OpenSSL decides whether it can use 
> the new aes instructions?  Does it decide at build time or at run time?
> If I build on a CPU that supports aes instructions but run on a cpu 
> that does not, will bad things happen?  Or is OpenSSL smart enough to 
> call functions implemented without aes instructions in that case?
Runtime.  See the file crypto/x86cpuid.pl which gets
converted to compiler-specific assembler source code.


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