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Add an explicit mbedtls_mpi_core_montmul_working_limbs() function

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove
2022-12-12 17:06:27 +00:00
parent 30f3b4d601
commit 28ff92cc3a
5 changed files with 38 additions and 3 deletions
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21
library/bignum_core.h
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@@ -502,6 +502,10 @@ int mbedtls_mpi_core_fill_random( mbedtls_mpi_uint *X, size_t X_limbs,
* \brief Returns the number of limbs of working memory required for
* a call to `mbedtls_mpi_core_exp_mod()`.
*
* \note This will always be at least
* `mbedtls_mpi_core_montmul_working_limbs(AN_limbs)`,
* i.e. sufficient for a call to `mbedtls_mpi_core_montmul()`.
*
* \param AN_limbs The number of limbs in the input `A` and the modulus `N`
* (they must be the same size) that will be given to
* `mbedtls_mpi_core_exp_mod()`.
@@ -585,6 +589,23 @@ mbedtls_mpi_uint mbedtls_mpi_core_sub_int( mbedtls_mpi_uint *X,
mbedtls_mpi_uint mbedtls_mpi_core_check_zero_ct( const mbedtls_mpi_uint *A,
size_t limbs );
/**
* \brief Returns the number of limbs of working memory required for
* a call to `mbedtls_mpi_core_montmul()`.
*
* \param AN_limbs The number of limbs in the input `A` and the modulus `N`
* (they must be the same size) that will be given to
* `mbedtls_mpi_core_montmul()` or one of the other functions
* that specifies this as the amount of working memory needed.
*
* \return The number of limbs of working memory required by
* `mbedtls_mpi_core_montmul()` (or other similar function).
*/
static inline size_t mbedtls_mpi_core_montmul_working_limbs( size_t AN_limbs )
{
return( 2 * AN_limbs + 1 );
}
/* END MERGE SLOT 3 */
/* BEGIN MERGE SLOT 4 */