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bignum: update comment about users of bignum_core

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard 2026-05-12 11:32:13 +02:00
parent 8f682e8f8e
commit 0395de165b
1 changed files with 7 additions and 1 deletions
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8
library/bignum_core.h
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@ -4,7 +4,13 @@
* This interface should only be used by the legacy bignum module (bignum.h)
* and the modular bignum modules (bignum_mod.c, bignum_mod_raw.c). All other
* modules should use the high-level modular bignum interface (bignum_mod.h)
* or the legacy bignum interface (bignum.h).
* or the legacy bignum interface (bignum.h). The only exceptions are:
* 1. In ecp_curves.c, some mbedtls_ecp_mod_pXXX_raw() functions are using
* bignum_core functions. That's because those functions are implementing a
* part of bignum_mod: the optimized reduction in mbedtls_mpi_mod_modulus.
* 2. In ecp.c, ecp_modp() is currently using bignum_core, while the rest of
* the module is using legacy bignum. That's transitional; eventually ecp.c is
* going to use bignum_mod_raw.
*
* This module is about processing non-negative integers with a fixed upper
* bound that's of the form 2^n-1 where n is a multiple of #biL.