tree c75cd4206fe205a0c8fb8fe21d2e29d29741cbfb
parent 7740eaf32fc2338e9efb2469ec0a351e96224ba9
author Gilles Peskine <Gilles.Peskine@arm.com> 1691675968 +0200
committer Gilles Peskine <Gilles.Peskine@arm.com> 1692275965 +0200

mbedtls_mpi_exp_mod: remove spurious copy of the output variable

Clear some confusion between `X` as the output variable and "X" as a name
given to the accumulator. Previous iterations of the code used the variable
`X` as the accumulator, but now that the accumulator is `W[x_index]`, some
of the comments didn't make sense.

Remove the copy of the initial value of `X` into `W[x_index]`, which was
meaningless: the initial value of an output variable should not, and did
not, matter. `W[x_index]` is later overridden unconditionally to take the
value `RR`.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>