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Bignum: clean up use of enums

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- Made use of enums in struct and function declaration
- All enums are handled by switch case now
- If the switch does nothing on default, omit the default case to make
  compiler warnings more powerful
- The two enums are now disjoint and the value 1 is skipped to make
  mistakes easier to detect

Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath
2022-08-11 14:58:29 +01:00
parent 9dfb5621ff
commit 296ea66442
3 changed files with 55 additions and 46 deletions
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43
library/bignum_mod.h
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@ -26,6 +26,22 @@
#include "mbedtls/bignum.h"
#endif
/* Skip 1 as it is slightly easier to accidentally pass to functions. */
typedef enum
{
MBEDTLS_MPI_MOD_REP_INVALID = 0,
MBEDTLS_MPI_MOD_REP_MONTGOMERY = 2,
MBEDTLS_MPI_MOD_REP_OPT_RED
} mbedtls_mpi_mod_rep_selector;
/* Make mbedtls_mpi_mod_rep_selector and mbedtls_mpi_mod_ext_rep disjoint to
* make it easier to catch when they are accidentally swapped. */
typedef enum
{
MBEDTLS_MPI_MOD_EXT_REP_INVALID = 0,
MBEDTLS_MPI_MOD_EXT_REP_LE = 8,
MBEDTLS_MPI_MOD_EXT_REP_BE
} mbedtls_mpi_mod_ext_rep;
typedef struct
{
@ -38,10 +54,10 @@ typedef void* mbedtls_mpi_opt_red_struct;
typedef struct {
mbedtls_mpi_uint *p;
size_t n; // number of limbs
size_t plen; // bitlen of p
int ext_rep; // signals external representation (eg. byte order)
int int_rep; // selector to signal the active member of the union
size_t n; // number of limbs
size_t plen; // bitlen of p
mbedtls_mpi_mod_ext_rep ext_rep; // signals external representation (eg. byte order)
mbedtls_mpi_mod_rep_selector int_rep; // selector to signal the active member of the union
union rep
{
mbedtls_mpi_mont_struct mont;
@ -49,21 +65,6 @@ typedef struct {
} rep;
} mbedtls_mpi_mod_modulus;
typedef enum
{
MBEDTLS_MPI_MOD_REP_INVALID = 0,
MBEDTLS_MPI_MOD_REP_MONTGOMERY,
MBEDTLS_MPI_MOD_REP_OPT_RED
} mbedtls_mpi_mod_rep_selector;
typedef enum
{
MBEDTLS_MPI_MOD_EXT_REP_INVALID = 0,
MBEDTLS_MPI_MOD_EXT_REP_LE,
MBEDTLS_MPI_MOD_EXT_REP_BE
} mbedtls_mpi_mod_ext_rep;
/** Setup a residue structure.
*
* \param r The address of residue to setup. The size is determined by \p m.
@ -124,8 +125,8 @@ void mbedtls_mpi_mod_modulus_init( mbedtls_mpi_mod_modulus *m );
int mbedtls_mpi_mod_modulus_setup( mbedtls_mpi_mod_modulus *m,
mbedtls_mpi_uint *p,
size_t pn,
int ext_rep,
int int_rep );
mbedtls_mpi_mod_ext_rep ext_rep,
mbedtls_mpi_mod_rep_selector int_rep );
/** Free elements of a modulus structure.
*