yuzu-emu/mbedtls
1
0
Fork 0
mirror of https://github.com/yuzu-emu/mbedtls.git synced 2024-11-22 21:45:40 +01:00
Code Issues Packages Projects Releases Wiki Activity

Stop checking for argument change

Browse Source 
This was intended to detect aborted operations, but now that case is handled
by the caller freeing the restart context.

Also, as the internal sub-context is managed by the callee, no need for the
caller to free/reset the restart context between successful calls.
This commit is contained in:
Manuel Pégourié-Gonnard 2017-04-20 09:47:06 +02:00
parent 3cade22f96
commit 8467e6848d
3 changed files with 6 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/mbedtls/ecp.h
View File

@ -263,9 +263,10 @@ typedef struct
*
* If more operations are needed to complete a computation,
* MBEDTLS_ERR_ECP_IN_PROGRESS will be returned by the
* function performing the computation. That function will
* then need to be called again with the same arguments until
* it returns 0 or an other error code.
* function performing the computation. It is then the
* caller's responsibility to either call again with the same
* arguments until it returns 0 or an error code; or to free
* the restart context if the operation is to be aborted.
*
* This only affects functions that accept a pointer to a
* \c mbedtls_ecp_restart_ctx as an argument, and only works
@ -615,14 +616,11 @@ int mbedtls_ecp_mul( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
* \param P Point to multiply
* \param f_rng RNG function (see notes)
* \param p_rng RNG parameter
* \param rs_ctx Restart context - must be non-NULL to enable early-return
* \param rs_ctx Restart context
*
* \return See \c mbedtls_ecp_mul(), or
* MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
* operations was reached (see \c mbedtls_ecp_set_max_ops()),
* indicating the function should be called again with the
* exact same arguments.
*
* operations was reached: see \c mbedtls_ecp_set_max_ops().
*/
int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,

18
library/ecp.c
View File

@ -105,8 +105,6 @@ void mbedtls_ecp_set_max_ops( unsigned max_ops )
*/
struct mbedtls_ecp_restart_mul {
unsigned ops_done; /* number of operations done this time */
mbedtls_mpi m; /* saved argument: scalar */
mbedtls_ecp_point P; /* saved argument: point */
mbedtls_ecp_point R; /* current intermediate result */
size_t i; /* current index in various loops, 0 outside */
mbedtls_ecp_point *T; /* table for precomputed points */
@ -139,8 +137,6 @@ static void ecp_restart_mul_free( mbedtls_ecp_restart_mul_ctx *ctx )
if( ctx == NULL )
return;
mbedtls_mpi_free( &ctx->m );
mbedtls_ecp_point_free( &ctx->P );
mbedtls_ecp_point_free( &ctx->R );
if( ctx->T != NULL ) {
@ -1763,17 +1759,6 @@ static int ecp_mul_comb( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
#endif
#if defined(MBEDTLS_ECP_EARLY_RETURN)
/* check for restart with new arguments */
if( rs_ctx != NULL && rs_ctx->rsm != NULL && rs_ctx->rsm != NULL &&
( mbedtls_mpi_cmp_mpi( m, &rs_ctx->rsm->m ) != 0 ||
mbedtls_mpi_cmp_mpi( &P->X, &rs_ctx->rsm->P.X ) != 0 ||
mbedtls_mpi_cmp_mpi( &P->Y, &rs_ctx->rsm->P.Y ) != 0 ) )
{
ecp_restart_mul_free( rs_ctx->rsm );
mbedtls_free( rs_ctx->rsm );
rs_ctx->rsm = NULL;
}
/* set up restart context if needed */
if( ecp_max_ops != 0 && rs_ctx != NULL && rs_ctx->rsm == NULL )
{
@ -1782,9 +1767,6 @@ static int ecp_mul_comb( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
return( MBEDTLS_ERR_ECP_ALLOC_FAILED );
ecp_restart_mul_init( rs_ctx->rsm );
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &rs_ctx->rsm->m, m ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_copy( &rs_ctx->rsm->P, P ) );
}
/* reset ops count for this call */

3
tests/suites/test_suite_ecp.function
View File

@ -116,9 +116,6 @@ void ecp_test_vect_restart( int id,
TEST_ASSERT( cnt_restarts >= min_restarts );
TEST_ASSERT( cnt_restarts <= max_restarts );
/* Prepare context for new operation */
mbedtls_ecp_restart_free( &ctx );
/* Non-base point case */
cnt_restarts = 0;
do {