054433c493
The plan is to count basic operations as follows: - call to ecp_add_mixed() -> 11 - call to ecp_double_jac() -> 8 - call to mpi_mul_mpi() -> 1 - call to mpi_inv_mod() -> 120 - everything else -> not counted The counts for ecp_add_mixed() and ecp_double_jac() are based on the actual number of calls to mpi_mul_mpi() they they make. The count for mpi_inv_mod() is based on timing measurements on K64F and LPC1768 boards, and are consistent with the usual very rough estimate of one inversion = 100 multiplications. It could be useful to repeat that measurement on a Cortex-M0 board as those have smaller divider and multipliers, so the result could be a bit different but should be the same order of magnitude. The documented limitation of 120 basic ops is due to the calls to mpi_inv_mod() which are currently not interruptible nor planned to be so far. |
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