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Calculating the Montgomery constant (R^2 mod N) is done in our implementation by zeroing the double-width representation of N, subtracting N once to give (R^2 - N) in order to obtain a positive value, then reducing this value modulo N. Extract this logic from bigint_mod_exp() to a separate function bigint_reduce_supremum(), to allow for reuse by other code. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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