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ecp_mod_raw: Enabled fast reduction.

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This patch modifies `mbedtls_mpi_mod_raw_mul`
to utilise fast-reduction when available.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2023-06-14 16:01:47 +01:00
parent 3048c8c906
commit 2ed8fb7e4f
1 changed files with 16 additions and 5 deletions
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21
library/bignum_mod_raw.c
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@ -114,8 +114,6 @@ void mbedtls_mpi_mod_raw_sub(mbedtls_mpi_uint *X,
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
}
#if defined(MBEDTLS_TEST_HOOKS)
MBEDTLS_STATIC_TESTABLE
void mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N)
@ -125,7 +123,6 @@ void mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
}
#endif /* MBEDTLS_TEST_HOOKS */
void mbedtls_mpi_mod_raw_mul(mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
@ -133,8 +130,22 @@ void mbedtls_mpi_mod_raw_mul(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N,
mbedtls_mpi_uint *T)
{
mbedtls_mpi_core_montmul(X, A, B, N->limbs, N->p, N->limbs,
N->rep.mont.mm, T);
const size_t T_limbs = (N->limbs * 2);
switch (N->int_rep) {
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
mbedtls_mpi_core_montmul(X, A, B, N->limbs, N->p, N->limbs,
N->rep.mont.mm, T);
break;
case MBEDTLS_MPI_MOD_REP_OPT_RED:
mbedtls_mpi_core_mul(T, A, N->limbs, B, N->limbs);
(*N->rep.ored.modp)(T, T_limbs);
mbedtls_mpi_mod_raw_fix_quasi_reduction(T, N);
memcpy(X, T, N->limbs * sizeof(mbedtls_mpi_uint));
break;
default:
break;
}
}
size_t mbedtls_mpi_mod_raw_inv_prime_working_limbs(size_t AN_limbs)