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Remove local MPI from ecp_randomize_jac()

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
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Hanno Becker 2022-01-04 06:45:49 +00:00
parent 885ed403c9
commit 0d629791e9
1 changed files with 10 additions and 8 deletions
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18
library/ecp.c
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@ -1611,26 +1611,28 @@ static int ecp_randomize_jac( const mbedtls_ecp_group *grp, mbedtls_ecp_point *p
return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ); return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
#else #else
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi l, ll; mbedtls_mpi l;
mbedtls_mpi_init( &l ); mbedtls_mpi_init( &ll ); mbedtls_mpi_init( &l );
/* Generate l such that 1 < l < p */ /* Generate l such that 1 < l < p */
MBEDTLS_MPI_CHK( mbedtls_mpi_random( &l, 2, &grp->P, f_rng, p_rng ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_random( &l, 2, &grp->P, f_rng, p_rng ) );
/* Z = l * Z */ /* Z = l * Z */
MPI_ECP_MUL( &pt->Z, &pt->Z, &l ); MPI_ECP_MUL( &pt->Z, &pt->Z, &l );
/* Y = l * Z */
MPI_ECP_MUL( &pt->Y, &pt->Y, &l );
/* X = l^2 * X */ /* X = l^2 * X */
MPI_ECP_SQR( &ll, &l ); MPI_ECP_SQR( &l, &l );
MPI_ECP_MUL( &pt->X, &pt->X, &ll ); MPI_ECP_MUL( &pt->X, &pt->X, &l );
/* Y = l^3 * Y */ /* Y = l^3 * Y */
MPI_ECP_MUL( &ll, &ll, &l ); MPI_ECP_MUL( &pt->Y, &pt->Y, &l );
MPI_ECP_MUL( &pt->Y, &pt->Y, &ll );
cleanup: cleanup:
mbedtls_mpi_free( &l ); mbedtls_mpi_free( &ll ); mbedtls_mpi_free( &l );
if( ret == MBEDTLS_ERR_MPI_NOT_ACCEPTABLE ) if( ret == MBEDTLS_ERR_MPI_NOT_ACCEPTABLE )
ret = MBEDTLS_ERR_ECP_RANDOM_FAILED; ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;