On Mon, Nov 20, 2017 at 11:43:22PM +0100, Thomas Gleixner wrote: > On Tue, 21 Nov 2017, Jarkko Sakkinen wrote: > > On Wed, Nov 15, 2017 at 12:50:06PM +0100, Peter Zijlstra wrote: > > > On Mon, Nov 13, 2017 at 09:45:25PM +0200, Jarkko Sakkinen wrote: > > > > TinyCrypt (https://github.com/01org/tinycrypt) is used as AES > > > > implementation, which is not timing resistant. Eventually this needs to > > > > be replaced with AES-NI based implementation that could be either > > > > > > > - re-use existing AES-NI code in the kernel > > > > > > This. That is an absolute must. We're not going to merge custom AES > > > implementations. > > > > I'll post v6 update without update to this in order to get otherwise > > improved version out and work on it for v7. > > > > My initial idea to sort this out would be to try to compile > > > > arch/x86/crypto/aesni-intel_asm.S > > > > as part of the enclave binary and use it to run AES-256. > > No. The kernel has a crypto API.
But you cannot call it from inside an enclave. A syscall will exit the enclave. The launch enclave requires AES-256 to be executed inside the enclave. /Jarkko
