[bravo22]

You are correct.

However, Trusted Computing crypto is different than the crypto accelerators you find as peripherals in an SoC.

I should have been more clear that I meant crypto peripherals. There are crypto instruction extensions but don't require a separate library implementation -- just asm code optimization in something like openSSL.

PolarSSL is also targeted (mainly) towards much lower power than A53 or Cortex-A. It is targeted towards Cortex-M where you are dealing with KB of data and often don't have an MMU. You can't just port OpenSSL to those platforms and run it at will, hence their optimized libraries.