mpi: Constant time mpi_inv with some conditions.
90b7339b0654
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Description

mpi: Constant time mpi_inv with some conditions.

* mpi/mpi-inv.c (mpih_add_n_cond, mpih_sub_n_cond, mpih_swap_cond)
(mpih_abs_cond): New.
(mpi_invm_odd): New.
(mpi_invm_generic): Rename from _gcry_mpi_invm.
(_gcry_mpi_invm): Use mpi_invm_odd for usual odd cases.

Cherry-pick master commit of:
20082ca965eab5665af60956c4ed72709836b1ed

GnuPG-bug-id: T4869
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

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Provenance

• gniibe

Authored on Mar 18 2020, 1:03 AM

Parents

rCffbc5702ab16: mpi: Abort on division by zero also in _gcry_mpi_tdiv_qr.

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Tasks

T4869: constant-time mpi_invm

Event Timeline

• gniibe committed rC90b7339b0654: mpi: Constant time mpi_inv with some conditions. (authored by • gniibe).Mar 18 2020, 1:12 AM

• gniibe committed rC90b7339b0654: mpi: Constant time mpi_inv with some conditions. (authored by • gniibe).

• gniibe added a task: T4869: constant-time mpi_invm.Jun 3 2021, 7:08 PM

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mpi/

mpi-inv.c

rC90b7339b0654

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mpi: Constant time mpi_inv with some conditions.90b7339b0654Actions

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rC90b7339b0654

mpi/mpi-inv.c

mpi: Constant time mpi_inv with some conditions.
90b7339b0654
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