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Add low level subtraction with modulus

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
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Gabor Mezei 2022-11-09 14:07:43 +01:00
parent 531a871b88
commit 4c7cf7d742
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2 changed files with 30 additions and 0 deletions
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10
library/bignum_mod_raw.c
View File

@ -108,6 +108,16 @@ int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
/* BEGIN MERGE SLOT 2 */ /* BEGIN MERGE SLOT 2 */
void mbedtls_mpi_mod_raw_sub( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
const mbedtls_mpi_mod_modulus *N )
{
mbedtls_mpi_uint c = mbedtls_mpi_core_sub( X, A, B, N->limbs );
(void) mbedtls_mpi_core_add_if( X, N->p, N->limbs, c );
}
/* END MERGE SLOT 2 */ /* END MERGE SLOT 2 */
/* BEGIN MERGE SLOT 3 */ /* BEGIN MERGE SLOT 3 */

20
library/bignum_mod_raw.h
View File

@ -144,6 +144,26 @@ int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
/* BEGIN MERGE SLOT 2 */ /* BEGIN MERGE SLOT 2 */
/** \brief Perform a subtraction of two MPIs and return the modulus
* of the result.
*
* The size of the operation is determined by \p N.
*
* \param[out] X The address of the result MPI.
* This must be initialized. Must have enough limbs to
* store the full value of the result.
* \param[in] A The address of the first MPI. This must be initialized.
* \param[in] B The address of the second MPI. This must be initialized.
* \param[in] N The address of the modulus. Use to perform a modulu
* operation on the result of the subtraction.
*
* \note Both \p A and \p B must be smaller than the modulus \p N.
*/
void mbedtls_mpi_mod_raw_sub( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
const mbedtls_mpi_mod_modulus *N );
/* END MERGE SLOT 2 */ /* END MERGE SLOT 2 */
/* BEGIN MERGE SLOT 3 */ /* BEGIN MERGE SLOT 3 */