David, Without the AES accelerator you will have to use a SW version of the algorithm. We do not have a SW version of AES256 available, but we do have a SW version of AES128. Benchmarks for this SW code can be found int he following application note. http://www.ti.com/lit/slaa547 Using the HW accelerator is highly encouraged when it is available as it speeds up the (d)encrypt process by a lot.
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