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Merge pull request #7859 from gilles-peskine-arm/mbedtls_mpi-smaller

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Reduce the size of mbedtls_mpi
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Dave Rodgman 2023-07-18 16:48:37 +01:00 • committed by GitHub
commit 5f65acb02b
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5 changed files with 35 additions and 21 deletions
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23
include/mbedtls/bignum.h
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@ -203,6 +203,12 @@ extern "C" {
* \brief MPI structure
*/
typedef struct mbedtls_mpi {
/** Pointer to limbs.
*
* This may be \c NULL if \c n is 0.
*/
mbedtls_mpi_uint *MBEDTLS_PRIVATE(p);
/** Sign: -1 if the mpi is negative, 1 otherwise.
*
* The number 0 must be represented with `s = +1`. Although many library
@ -214,16 +220,19 @@ typedef struct mbedtls_mpi {
* Note that this implies that calloc() or `... = {0}` does not create
* a valid MPI representation. You must call mbedtls_mpi_init().
*/
int MBEDTLS_PRIVATE(s);
signed short MBEDTLS_PRIVATE(s);
/** Total number of limbs in \c p. */
size_t MBEDTLS_PRIVATE(n);
/** Pointer to limbs.
*
* This may be \c NULL if \c n is 0.
unsigned short MBEDTLS_PRIVATE(n);
/* Make sure that MBEDTLS_MPI_MAX_LIMBS fits in n.
* Use the same limit value on all platforms so that we don't have to
* think about different behavior on the rare platforms where
* unsigned short can store values larger than the minimum required by
* the C language, which is 65535.
*/
mbedtls_mpi_uint *MBEDTLS_PRIVATE(p);
#if MBEDTLS_MPI_MAX_LIMBS > 65535
#error "MBEDTLS_MPI_MAX_LIMBS > 65535 is not supported"
#endif
}
mbedtls_mpi;