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Functions to convert raw residues to/from the modulus representation

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Test cases will be generated automatically by a subsequent commit.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2022-12-20 19:21:17 +01:00
parent 7a708fd49f
commit 1e2a4d4089
3 changed files with 116 additions and 0 deletions
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30
library/bignum_mod_raw.c
View File

@ -176,6 +176,36 @@ void mbedtls_mpi_mod_raw_add( mbedtls_mpi_uint *X,
/* BEGIN MERGE SLOT 6 */
int mbedtls_mpi_mod_raw_canonical_to_modulus_rep(
mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N )
{
switch( N->int_rep )
{
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
return( mbedtls_mpi_mod_raw_to_mont_rep( X, N ) );
case MBEDTLS_MPI_MOD_REP_OPT_RED:
return( 0 );
default:
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
}
}
int mbedtls_mpi_mod_raw_modulus_to_canonical_rep(
mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N )
{
switch( N->int_rep )
{
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
return( mbedtls_mpi_mod_raw_from_mont_rep( X, N ) );
case MBEDTLS_MPI_MOD_REP_OPT_RED:
return( 0 );
default:
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
}
}
int mbedtls_mpi_mod_raw_random( mbedtls_mpi_uint *X,
mbedtls_mpi_uint min,
const mbedtls_mpi_mod_modulus *N,

34
library/bignum_mod_raw.h
View File

@ -297,6 +297,40 @@ void mbedtls_mpi_mod_raw_add( mbedtls_mpi_uint *X,
/* BEGIN MERGE SLOT 6 */
/** Convert an MPI from canonical representation (little-endian limb array)
* to the representation associated with the modulus.
*
* \param[in,out] X The limb array to convert.
* It must have as many limbs as \p N.
* It is converted in place.
* If this function returns an error, the content of \p X
* is unspecified.
* \param[in] N The modulus structure.
*
*\ return \c 0 if successful.
* Otherwise an \c MBEDTLS_ERR_MPI_xxx error code.
*/
int mbedtls_mpi_mod_raw_canonical_to_modulus_rep(
mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N );
/** Convert an MPI from the representation associated with the modulus
* to canonical representation (little-endian limb array).
*
* \param[in,out] X The limb array to convert.
* It must have as many limbs as \p N.
* It is converted in place.
* If this function returns an error, the content of \p X
* is unspecified.
* \param[in] N The modulus structure.
*
*\ return \c 0 if successful.
* Otherwise an \c MBEDTLS_ERR_MPI_xxx error code.
*/
int mbedtls_mpi_mod_raw_modulus_to_canonical_rep(
mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N );
/** Generate a random number uniformly in a range.
*
* This function generates a random number between \p min inclusive and