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Use s2n-bignum P-256 scalar multiplication and Montgomery inverse #1877

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Use s2n-bignum P-256 scalar multiplication and Montgomery inverse #1877

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Commits on Sep 25, 2024

  1. Use s2n-bignum P-256 scalar multiplication and Montgomery inverse 

    This replaces the general (fresh, not precomputed, point) scalar
multiplication with the corresponding function p256_montjscalarmul
or p256_montjscalarmul_alt from s2n-bignum, and also replaces the
Fermat inverse in p256-nistz.c with the markedly faster and formally
verified divstep-based code from s2n-bignum, bignum_montinv_p256.
    @jargh
    jargh committed Sep 25, 2024
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Commits on Sep 26, 2024

  1. Fix prefix build for new P-256 code 

    Thanks to Torben
    @jargh
    jargh committed Sep 26, 2024
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