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Make some macros/functions public

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These will be needed in other modules that already include ecp.h
This commit is contained in:
Manuel Pégourié-Gonnard 2017-04-20 16:31:00 +02:00
parent b5a50e754d
commit c751148cc5
2 changed files with 39 additions and 22 deletions
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27
include/mbedtls/ecp.h
View File

@ -198,8 +198,35 @@ typedef struct
mbedtls_ecp_restart_muladd_ctx *ma; /*!< ecp_muladd() sub-context */
} mbedtls_ecp_restart_ctx;
/*
* Operation counts for restartable functions
*/
#define MBEDTLS_ECP_OPS_DBL 8 /*!< basic ops count for ecp_double_jac() */
#define MBEDTLS_ECP_OPS_ADD 11 /*!< basic ops count for see ecp_add_mixed() */
#define MBEDTLS_ECP_OPS_INV 120 /*!< empirical equivalent for mpi_mod_inv() */
/**
* \brief Internal; for restartable functions in other modules.
* Check and update basic ops budget.
*
* \param grp Group structure
* \param rs_ctx Restart context
* \param ops Number of basic ops to do
*
* \return 0 is doing 'ops' basic ops is still allowed,
* MBEDTLS_ERR_ECP_IN_PROGRESS otherwise.
*/
int mbedtls_ecp_check_budget( const mbedtls_ecp_group *grp,
mbedtls_ecp_restart_ctx *rs_ctx,
unsigned ops );
/* Utility macro for checking and updating ops budget */
#define MBEDTLS_ECP_BUDGET( ops ) MBEDTLS_MPI_CHK( mbedtls_ecp_check_budget( grp, rs_ctx, ops ) );
#else /* MBEDTLS_ECP_RESTARTABLE */
#define MBEDTLS_ECP_BUDGET( ops ) /* no-op; for compatibility */
/* We want to declare restartable versions of existing functions anyway */
typedef void mbedtls_ecp_restart_ctx;

34
library/ecp.c
View File

@ -213,19 +213,12 @@ void mbedtls_ecp_restart_free( mbedtls_ecp_restart_ctx *ctx )
ctx->ma = NULL;
}
/*
* Operation counts
*/
#define ECP_OPS_DBL 8 /* see ecp_double_jac() */
#define ECP_OPS_ADD 11 /* see ecp_add_mixed() */
#define ECP_OPS_INV 120 /* empirical equivalent */
/*
* Check if we can do the next step
*/
static int ecp_check_budget( const mbedtls_ecp_group *grp,
mbedtls_ecp_restart_ctx *rs_ctx,
unsigned ops )
int mbedtls_ecp_check_budget( const mbedtls_ecp_group *grp,
mbedtls_ecp_restart_ctx *rs_ctx,
unsigned ops )
{
if( rs_ctx != NULL && ecp_max_ops != 0 )
{
@ -247,9 +240,6 @@ static int ecp_check_budget( const mbedtls_ecp_group *grp,
return( 0 );
}
#define ECP_BUDGET( ops ) MBEDTLS_MPI_CHK( ecp_check_budget( grp, rs_ctx, ops ) );
#else
#define ECP_BUDGET( ops ) /* no-op */
#endif /* MBEDTLS_ECP_RESTARTABLE */
#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) || \
@ -1437,7 +1427,7 @@ static int ecp_precompute_comb( const mbedtls_ecp_group *grp,
for( ; j < d * ( w - 1 ); j++ )
{
ECP_BUDGET( ECP_OPS_DBL );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_DBL );
i = 1U << ( j / d );
cur = T + i;
@ -1468,7 +1458,7 @@ norm_dbl:
for( i = 1; i < T_len; i <<= 1 )
TT[j++] = T + i;
ECP_BUDGET( ECP_OPS_INV + 6 * j - 2 );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_INV + 6 * j - 2 );
MBEDTLS_MPI_CHK( ecp_normalize_jac_many( grp, TT, j ) );
@ -1485,7 +1475,7 @@ norm_dbl:
add:
#endif
ECP_BUDGET( ( T_len - 1 ) * ECP_OPS_ADD );
MBEDTLS_ECP_BUDGET( ( T_len - 1 ) * MBEDTLS_ECP_OPS_ADD );
for( i = 1; i < T_len; i <<= 1 )
{
@ -1511,7 +1501,7 @@ norm_add:
for( j = 0; j + 1 < T_len; j++ )
TT[j] = T + j + 1;
ECP_BUDGET( ECP_OPS_INV + 6 * j - 2 );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_INV + 6 * j - 2 );
MBEDTLS_MPI_CHK( ecp_normalize_jac_many( grp, TT, j ) );
@ -1602,7 +1592,7 @@ static int ecp_mul_comb_core( const mbedtls_ecp_group *grp, mbedtls_ecp_point *R
while( i-- != 0 )
{
ECP_BUDGET( ECP_OPS_DBL + ECP_OPS_ADD );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_DBL + MBEDTLS_ECP_OPS_ADD );
MBEDTLS_MPI_CHK( ecp_double_jac( grp, R, R ) );
MBEDTLS_MPI_CHK( ecp_select_comb( grp, &Txi, T, t_len, x[i] ) );
MBEDTLS_MPI_CHK( ecp_add_mixed( grp, R, R, &Txi ) );
@ -1723,7 +1713,7 @@ static int ecp_mul_comb_after_precomp( const mbedtls_ecp_group *grp,
#endif
}
ECP_BUDGET( ECP_OPS_INV );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_INV );
MBEDTLS_MPI_CHK( ecp_normalize_jac( grp, RR ) );
#if defined(MBEDTLS_ECP_RESTARTABLE)
@ -2162,7 +2152,7 @@ int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, P ) );
/* check_privkey is 0M and check_pubkey is 3M */
ECP_BUDGET( 3 );
MBEDTLS_ECP_BUDGET( 3 );
}
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
@ -2365,7 +2355,7 @@ mul2:
add:
#endif
ECP_BUDGET( ECP_OPS_ADD );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_ADD );
MBEDTLS_MPI_CHK( ecp_add_mixed( grp, pR, pmP, pR ) );
#if defined(MBEDTLS_ECP_RESTARTABLE)
if( rs_ctx != NULL && rs_ctx->ma != NULL )
@ -2373,7 +2363,7 @@ add:
norm:
#endif
ECP_BUDGET( ECP_OPS_INV );
MBEDTLS_ECP_BUDGET( MBEDTLS_ECP_OPS_INV );
MBEDTLS_MPI_CHK( ecp_normalize_jac( grp, pR ) );
#if defined(MBEDTLS_ECP_RESTARTABLE)