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Extract MPI_CORE(add_mod) from the prototype

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Hanno Becker 2022-11-01 13:14:28 +00:00 • committed by Tom Cosgrove
parent 4cf77e99ab
commit a45b6fee91
2 changed files with 26 additions and 2 deletions
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13
library/bignum_mod_raw.c
View file

@ -119,7 +119,18 @@ int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
/* END MERGE SLOT 4 */ /* END MERGE SLOT 4 */
/* BEGIN MERGE SLOT 5 */ /* BEGIN MERGE SLOT 5 */
void MPI_CORE(add_mod)( mbedtls_mpi_uint *X,
mbedtls_mpi_uint const *A,
mbedtls_mpi_uint const *B,
const mbedtls_mpi_uint *N,
size_t n )
{
size_t carry, borrow = 0, fixup;
carry = mbedtls_mpi_core_add( X, A, B, n );
borrow = mbedtls_mpi_core_sub( X, X, N, n);
fixup = ( carry < borrow );
(void) mbedtls_mpi_core_add_if( X, N, n, fixup );
}
/* END MERGE SLOT 5 */ /* END MERGE SLOT 5 */
/* BEGIN MERGE SLOT 6 */ /* BEGIN MERGE SLOT 6 */

15
library/bignum_mod_raw.h
View file

@ -155,7 +155,20 @@ int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
/* END MERGE SLOT 4 */ /* END MERGE SLOT 4 */
/* BEGIN MERGE SLOT 5 */ /* BEGIN MERGE SLOT 5 */
/**
* \brief Perform a known-size modular addition.
*
* Calculate A + B mod N.
*
* \param[out] X The result of the modular addition.
* \param[in] A The left operand. This must be smaller than \p N.
* \param[in] B The right operand. This must be smaller than \p N.
* \param[in] N The modulus.
* \param n Number of limbs of \p X, \p A, \p B and \p N.
*/
void MPI_CORE(add_mod)( mbedtls_mpi_uint *X, mbedtls_mpi_uint const *A,
mbedtls_mpi_uint const *B, const mbedtls_mpi_uint *N,
size_t n );
/* END MERGE SLOT 5 */ /* END MERGE SLOT 5 */
/* BEGIN MERGE SLOT 6 */ /* BEGIN MERGE SLOT 6 */