[openssl/openssl] 8a5338: Add value_barrier in MOD_EXP_CTIME_COPY_FROM_PREBUF

  Branch: refs/heads/openssl-3.4
  Home:   https://github.com/openssl/openssl
  Commit: 8a5338591a20618bc22edb0a4572141f3bd0507f
      https://github.com/openssl/openssl/commit/8a5338591a20618bc22edb0a4572141f3bd0507f
  Author: Kurt Roeckx <[email protected]>
  Date:   2026-07-29 (Wed, 29 Jul 2026)

  Changed paths:
    M crypto/bn/bn_exp.c

  Log Message:
  -----------
  Add value_barrier in MOD_EXP_CTIME_COPY_FROM_PREBUF

Without it, compilers can figure out the possible values and optimize
based on it.

Reviewed-by: Andrew Dinh <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Eugene Syromiatnikov <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
MergeDate: Wed Jul 29 17:04:46 2026
(Merged from https://github.com/openssl/openssl/pull/31957)

(cherry picked from commit f8c26111bab30399d0c9262269089639ff8e4746)


  Commit: 55e77d86bbee7b8884e40ec371c94abc73756c08
      https://github.com/openssl/openssl/commit/55e77d86bbee7b8884e40ec371c94abc73756c08
  Author: Kurt Roeckx <[email protected]>
  Date:   2026-07-29 (Wed, 29 Jul 2026)

  Changed paths:
    M crypto/bn/bn_lib.c

  Log Message:
  -----------
  Add value_barrier in BN_consttime_swap

Without it, compilers can figure out the possible values and optimize
based on it.

Reviewed-by: Andrew Dinh <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Eugene Syromiatnikov <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
MergeDate: Wed Jul 29 17:04:47 2026
(Merged from https://github.com/openssl/openssl/pull/31957)

(cherry picked from commit 1d7a8dd73ff9e0fc197611433b9b60b4b5f5465c)


  Commit: 7b68bf707b14b75731fb3a70189d6be3f0f78421
      https://github.com/openssl/openssl/commit/7b68bf707b14b75731fb3a70189d6be3f0f78421
  Author: Kurt Roeckx <[email protected]>
  Date:   2026-07-29 (Wed, 29 Jul 2026)

  Changed paths:
    M crypto/bn/bn_exp.c

  Log Message:
  -----------
  Apply suggestion from @andrewkdinh

Co-authored-by: Andrew Dinh <[email protected]>

Reviewed-by: Andrew Dinh <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Eugene Syromiatnikov <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
MergeDate: Wed Jul 29 17:04:49 2026
(Merged from https://github.com/openssl/openssl/pull/31957)

(cherry picked from commit 33482fbddcf137dde9bd84ae12f2f02cbc358c78)


Compare: https://github.com/openssl/openssl/compare/e02db257e243...7b68bf707b14

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