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Move the quasi reduction fixing function to bignum_mod_raw

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Rename the function to 'fix_quasi_reduction' to better suite its functionality.
Also changed the name prefix to suite for the new module.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei
2023-01-23 16:13:43 +01:00
parent 7e14c66c4d
commit aaa1d2a276
14 changed files with 149 additions and 296 deletions
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15
library/bignum_mod_raw.c
View File

@@ -128,6 +128,21 @@ void mbedtls_mpi_mod_raw_mul(mbedtls_mpi_uint *X,
N->rep.mont.mm, T);
}
MBEDTLS_STATIC_TESTABLE
int mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N)
{
if (N->limbs == 0) {
return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
}
mbedtls_mpi_uint c = mbedtls_mpi_core_sub(X, X, N->p, N->limbs);
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
return 0;
}
/* END MERGE SLOT 2 */
/* BEGIN MERGE SLOT 3 */

17
library/ecp_internal.h → library/bignum_mod_raw_invasive.h
View File

@@ -1,8 +1,8 @@
/**
* \file ecp_internal.h
* \file bignum_mod_raw_invasive.h
*
* \brief Function declarations for internal functions of elliptic curve
* point arithmetic.
* \brief Function declarations for invasive functions of Low-level
* modular bignum.
*/
/**
* Copyright The Mbed TLS Contributors
@@ -21,8 +21,8 @@
* limitations under the License.
*/
#ifndef MBEDTLS_ECP_INTERNAL_H
#define MBEDTLS_ECP_INTERNAL_H
#ifndef MBEDTLS_BIGNUM_MOD_RAW_INVASIVE_H
#define MBEDTLS_BIGNUM_MOD_RAW_INVASIVE_H
#include "common.h"
#include "mbedtls/bignum.h"
@@ -40,7 +40,8 @@
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if \p N is invalid.
*/
int mbedtls_ecp_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N);
MBEDTLS_STATIC_TESTABLE
int mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N);
#endif /* MBEDTLS_ECP_INTERNAL_H */
#endif /* MBEDTLS_BIGNUM_MOD_RAW_INVASIVE_H */

15
library/ecp.c
View File

@@ -79,7 +79,6 @@
#include "bn_mul.h"
#include "ecp_invasive.h"
#include "ecp_internal.h"
#include "bignum_core.h"
#include <string.h>
@@ -1031,20 +1030,6 @@ cleanup:
return ret;
}
int mbedtls_ecp_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N)
{
if (N->limbs == 0) {
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
mbedtls_mpi_uint c = mbedtls_mpi_core_sub(X, X, N->p, N->limbs);
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
return 0;
}
/*
* Fast mod-p functions expect their argument to be in the 0..p^2 range.
*