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Make the first precomp loop restartable

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Manuel Pégourié-Gonnard 2017-03-20 12:50:41 +01:00
parent ae55707b28
commit 213541a548
1 changed files with 21 additions and 4 deletions
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25
library/ecp.c
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@ -1335,7 +1335,7 @@ static int ecp_precompute_comb( const mbedtls_ecp_group *grp,
{
int ret;
unsigned char i;
size_t j;
size_t j = 0;
const unsigned char T_len = 1U << ( w - 1 );
mbedtls_ecp_point *cur, *TT[COMB_MAX_PRE - 1];
@ -1355,12 +1355,19 @@ static int ecp_precompute_comb( const mbedtls_ecp_group *grp,
* Set T[0] = P and
* T[2^{l-1}] = 2^{dl} P for l = 1 .. w-1 (this is not the final value)
*/
ECP_BUDGET( ( w - 1 ) * d * ECP_OPS_DBL ); // XXX: split loop
MBEDTLS_MPI_CHK( mbedtls_ecp_copy( &T[0], P ) );
for( j = 0; j < d * ( w - 1 ); j++ )
#if defined(MBEDTLS_ECP_EARLY_RETURN)
if( grp->rs != NULL && grp->rs->i != 0 )
j = grp->rs->i;
else
#endif
j = 0;
for( ; j < d * ( w - 1 ); j++ )
{
ECP_BUDGET( ECP_OPS_DBL );
i = 1U << ( j / d );
cur = T + i;
@ -1372,7 +1379,10 @@ static int ecp_precompute_comb( const mbedtls_ecp_group *grp,
#if defined(MBEDTLS_ECP_EARLY_RETURN)
if( grp->rs != NULL )
{
grp->rs->i = 0;
grp->rs->state++;
}
#endif
/*
@ -1440,6 +1450,13 @@ norm_add:
#endif
cleanup:
#if defined(MBEDTLS_ECP_EARLY_RETURN)
if( grp->rs != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
{
if( grp->rs->state == ecp_rs_init )
grp->rs->i = j;
}
#endif
return( ret );
}