modexpng_fpga_model
===================

Math model of ModExpNG IP core. The model mimics how an FPGA does modular exponentiation.

First use the scripts from the `vector/` folder to generate and format a keypair vector, then edit the <i>DUMP_*</i> switches in `modexpng_fpga_model.py` to dump the desired internal values. The <i>FORCE_OVERFLOW</i> setting artificially forces the virtually neven seen internal interim overflow situation and allows its handler to be tested. You can also un-comment the _#c.dump_banks()_ line and move it anywhere within _sign_using_crt()_ and/or _sign_without_crt()_ to dump the contents of entire core's memory.