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[3.6] Rsa: use the CRT to generate base blinding values #10513

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[3.6] Rsa: use the CRT to generate base blinding values #10513

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@mpg mpg commented Nov 18, 2025

Description

In builds where MBEDTLS_RSA_NO_CRT is disabled, take advantage of the CRT when generating the initial value for base blinding.

See #10476

PR checklist

  • changelog not required because: performance improvement
  • development PR not required because: on the crypto side
  • TF-PSA-Crypto PR provided #TODO
  • framework PR not required
  • 3.6 PR provided HERE
  • tests not required because: covered by existing tests

mpg added 3 commits November 18, 2025 11:38
@mpg
rsa: extract helper function
3be31bf 
Will gain a new implementation using the CRT, so we want to hide the
upcoming complexity in a dedicated function.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
@mpg
rsa: extract helper function for CRT
b13033d 
Was only used in one place so far, but will be used in
rsa_gen_rand_with_inverse()'s upcoming CRT-based implementation.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
@mpg
rsa: use the CRT to generate blinding values
8b0ee34 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
@mpg mpg self-assigned this Nov 18, 2025
@mpg mpg mentioned this pull request Nov 18, 2025
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@mpg mpg added needs-review Every commit must be reviewed by at least two team members, needs-reviewer This PR needs someone to pick it up for review labels Nov 20, 2025
@mpg mpg added the size-s Estimated task size: small (~2d) label Nov 20, 2025
@mpg mpg marked this pull request as ready for review November 20, 2025 08:45
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