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Implement mbedtls_mpi_mod_add()

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Signed-off-by: Werner Lewis <werner.lewis@arm.com>
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Werner Lewis
2022-11-29 12:25:05 +00:00
parent 977c53f00a
commit e1b6b7c0ac
5 changed files with 184 additions and 1 deletions
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30
library/bignum_mod.h
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@ -199,7 +199,35 @@ int mbedtls_mpi_mod_sub( mbedtls_mpi_mod_residue *X,
/* END MERGE SLOT 4 */
/* BEGIN MERGE SLOT 5 */
/**
* \brief Perform a fixed-size modular addition.
*
* Calculate `A + B modulo N`.
*
* \p A, \p B and \p X 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.
*
* \note This function does not check that \p A or \p B are in canonical
* form (that is, are < \p N) - that will have been done by
* mbedtls_mpi_mod_residue_setup().
*
* \param[out] X The address of the result MPI. Must be initialized.
* Must have the same number of limbs as the modulus \p N.
* \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 addition.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the given MPIs do not
* have the correct number of limbs.
*/
int mbedtls_mpi_mod_add( mbedtls_mpi_mod_residue *X,
const mbedtls_mpi_mod_residue *A,
const mbedtls_mpi_mod_residue *B,
const mbedtls_mpi_mod_modulus *N );
/* END MERGE SLOT 5 */
/* BEGIN MERGE SLOT 6 */