Peter Kolbus ca8b8e7c31 Restore retry in rsa_prepare_blinding() ...

Starting with commit 49e94e3, the do/while loop in
`rsa_prepare_blinding()` was changed to a `do...while(0)`, which
prevents retry from being effective and leaves dead code.

Restore the while condition to retry, and lift the calls to finish the
computation out of the while loop by by observing that they are
performed only when `mbedtls_mpi_inv_mod()` returns zero.

Signed-off-by: Peter Kolbus <peter.kolbus@garmin.com>

2020-09-25 08:43:57 -05:00

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