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bignum_mod: Refactored mbedtls_mpi_mod_modulus_setup()

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This patch removes the `int_rep` input parameter for modular
setup, aiming to align it with the optred variant.

Test and test-suite helper functions have been updated
accordingly.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis
2023-05-09 14:11:43 +01:00
parent 67ebaaf8a0
commit 88e16dfa2a
7 changed files with 46 additions and 60 deletions
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27
library/bignum_mod.c
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@ -138,31 +138,15 @@ cleanup:
int mbedtls_mpi_mod_modulus_setup(mbedtls_mpi_mod_modulus *N,
const mbedtls_mpi_uint *p,
size_t p_limbs,
mbedtls_mpi_mod_rep_selector int_rep)
size_t p_limbs)
{
int ret = 0;
N->p = p;
N->limbs = p_limbs;
N->bits = mbedtls_mpi_core_bitlen(p, p_limbs);
switch (int_rep) {
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
N->int_rep = int_rep;
N->rep.mont.mm = mbedtls_mpi_core_montmul_init(N->p);
ret = set_mont_const_square(&N->rep.mont.rr, N->p, N->limbs);
break;
case MBEDTLS_MPI_MOD_REP_OPT_RED:
N->int_rep = int_rep;
N->rep.ored = NULL;
break;
default:
ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
goto exit;
}
exit:
N->int_rep = MBEDTLS_MPI_MOD_REP_MONTGOMERY;
N->rep.mont.mm = mbedtls_mpi_core_montmul_init(N->p);
ret = set_mont_const_square(&N->rep.mont.rr, N->p, N->limbs);
if (ret != 0) {
mbedtls_mpi_mod_modulus_free(N);
@ -248,8 +232,7 @@ static int mbedtls_mpi_mod_inv_non_mont(mbedtls_mpi_mod_residue *X,
mbedtls_mpi_mod_modulus Nmont;
mbedtls_mpi_mod_modulus_init(&Nmont);
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_modulus_setup(&Nmont, N->p, N->limbs,
MBEDTLS_MPI_MOD_REP_MONTGOMERY));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_modulus_setup(&Nmont, N->p, N->limbs));
/* We'll use X->p to hold the Montgomery form of the input A->p */
mbedtls_mpi_core_to_mont_rep(X->p, A->p, Nmont.p, Nmont.limbs,