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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
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@ -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;