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Manuel Pégourié-Gonnard 2017-03-13 12:03:33 +01:00
parent 4b2336d7f6
commit 24be79588d
1 changed files with 7 additions and 7 deletions
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14
library/ecp.c
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@ -1465,13 +1465,6 @@ static int ecp_mul_comb( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
mbedtls_mpi_init( &M );
/*
* We need an odd scalar for recoding. Ensure that by replacing it with
* its opposite, then negating the result to compensate if needed.
*/
m_is_odd = ( mbedtls_mpi_get_bit( m, 0 ) == 1 );
MBEDTLS_MPI_CHK( ecp_make_scalar_odd( grp, &M, m, m_is_odd ) );
/* Is P the base point ? */
#if MBEDTLS_ECP_FIXED_POINT_OPTIM == 1
p_eq_g = ( mbedtls_mpi_cmp_mpi( &P->Y, &grp->G.Y ) == 0 &&
@ -1509,6 +1502,13 @@ static int ecp_mul_comb( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
}
}
/*
* We need an odd scalar for recoding. Ensure that by replacing it with
* its opposite, then negating the result to compensate if needed.
*/
m_is_odd = ( mbedtls_mpi_get_bit( m, 0 ) == 1 );
MBEDTLS_MPI_CHK( ecp_make_scalar_odd( grp, &M, m, m_is_odd ) );
/*
* Go for comb multiplication, R = M * P
*/