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Update mbedtls_mpi_safe_cond_(assign|swap) part 2

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-17 13:55:01 +01:00
parent cd2e38b906
commit 589ccb8aaa
1 changed files with 5 additions and 7 deletions
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12
library/bignum.c
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@ -141,19 +141,17 @@ int mbedtls_mpi_safe_cond_assign(mbedtls_mpi *X,
MPI_VALIDATE_RET(X != NULL);
MPI_VALIDATE_RET(Y != NULL);
mbedtls_ct_condition_t do_assign = mbedtls_ct_bool(assign);
/* all-bits 1 if assign is 1, all-bits 0 if assign is 0 */
mbedtls_mpi_uint limb_mask = mbedtls_ct_mpi_uint_mask(assign);
MBEDTLS_MPI_CHK(mbedtls_mpi_grow(X, Y->n));
X->s = (int) mbedtls_ct_uint_if(assign, Y->s, X->s);
mbedtls_ct_condition_t do_assign = mbedtls_ct_bool(assign);
X->s = (int) mbedtls_ct_uint_if_new(do_assign, Y->s, X->s);
mbedtls_mpi_core_cond_assign(X->p, Y->p, Y->n, do_assign);
mbedtls_ct_condition_t do_not_assign = mbedtls_ct_bool_not(do_assign);
for (size_t i = Y->n; i < X->n; i++) {
X->p[i] &= ~limb_mask;
X->p[i] = mbedtls_ct_mpi_uint_if0(do_not_assign, X->p[i]);
}
cleanup: