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Merge pull request #6742 from gabor-mezei-arm/6022_bignum_mod_raw_mul

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Bignum: Implement fixed width raw modular multiplication
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Gilles Peskine 2022-12-17 13:25:43 +01:00 • committed by GitHub
commit cf86d70162
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35
library/bignum_mod_raw.h
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@ -215,6 +215,41 @@ void mbedtls_mpi_mod_raw_sub( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *B,
const mbedtls_mpi_mod_modulus *N );
/** \brief Multiply two MPIs, returning the residue modulo the specified
* modulus.
*
* \note Currently handles the case when `N->int_rep` is
* MBEDTLS_MPI_MOD_REP_MONTGOMERY.
*
* The size of the operation is determined by \p N. \p A, \p B and \p X must
* all be associated with the modulus \p N and must all have the same number
* of limbs as \p N.
*
* \p X may be aliased to \p A or \p B, or even both, but may not overlap
* either otherwise. They may not alias \p N (since they must be in canonical
* form, they cannot == \p N).
*
* \param[out] X The address of the result MPI. Must have the same
* number of limbs as \p N.
* On successful completion, \p X contains the result of
* the multiplication `A * B * R^-1` mod N where
* `R = 2^(biL * N->limbs)`.
* \param[in] A The address of the first MPI.
* \param[in] B The address of the second MPI.
* \param[in] N The address of the modulus. Used to perform a modulo
* operation on the result of the multiplication.
* \param[in,out] T Temporary storage of size at least 2 * N->limbs + 1
* limbs. Its initial content is unused and
* its final content is indeterminate.
* It must not alias or otherwise overlap any of the
* other parameters.
*/
void mbedtls_mpi_mod_raw_mul( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
const mbedtls_mpi_mod_modulus *N,
mbedtls_mpi_uint *T );
/* END MERGE SLOT 2 */
/* BEGIN MERGE SLOT 3 */