Functions to convert raw residues to/from the modulus representation
Test cases will be generated automatically by a subsequent commit. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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@ -176,6 +176,36 @@ void mbedtls_mpi_mod_raw_add( mbedtls_mpi_uint *X,
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/* BEGIN MERGE SLOT 6 */
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int mbedtls_mpi_mod_raw_canonical_to_modulus_rep(
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mbedtls_mpi_uint *X,
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const mbedtls_mpi_mod_modulus *N )
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{
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switch( N->int_rep )
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{
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case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
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return( mbedtls_mpi_mod_raw_to_mont_rep( X, N ) );
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case MBEDTLS_MPI_MOD_REP_OPT_RED:
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return( 0 );
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default:
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return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
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}
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}
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int mbedtls_mpi_mod_raw_modulus_to_canonical_rep(
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mbedtls_mpi_uint *X,
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const mbedtls_mpi_mod_modulus *N )
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{
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switch( N->int_rep )
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{
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case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
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return( mbedtls_mpi_mod_raw_from_mont_rep( X, N ) );
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case MBEDTLS_MPI_MOD_REP_OPT_RED:
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return( 0 );
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default:
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return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
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}
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}
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int mbedtls_mpi_mod_raw_random( mbedtls_mpi_uint *X,
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mbedtls_mpi_uint min,
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const mbedtls_mpi_mod_modulus *N,
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@ -297,6 +297,40 @@ void mbedtls_mpi_mod_raw_add( mbedtls_mpi_uint *X,
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/* BEGIN MERGE SLOT 6 */
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/** Convert an MPI from canonical representation (little-endian limb array)
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* to the representation associated with the modulus.
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*
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* \param[in,out] X The limb array to convert.
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* It must have as many limbs as \p N.
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* It is converted in place.
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* If this function returns an error, the content of \p X
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* is unspecified.
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* \param[in] N The modulus structure.
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*
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*\ return \c 0 if successful.
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* Otherwise an \c MBEDTLS_ERR_MPI_xxx error code.
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*/
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int mbedtls_mpi_mod_raw_canonical_to_modulus_rep(
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mbedtls_mpi_uint *X,
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const mbedtls_mpi_mod_modulus *N );
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/** Convert an MPI from the representation associated with the modulus
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* to canonical representation (little-endian limb array).
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*
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* \param[in,out] X The limb array to convert.
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* It must have as many limbs as \p N.
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* It is converted in place.
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* If this function returns an error, the content of \p X
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* is unspecified.
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* \param[in] N The modulus structure.
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*
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*\ return \c 0 if successful.
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* Otherwise an \c MBEDTLS_ERR_MPI_xxx error code.
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*/
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int mbedtls_mpi_mod_raw_modulus_to_canonical_rep(
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mbedtls_mpi_uint *X,
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const mbedtls_mpi_mod_modulus *N );
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/** Generate a random number uniformly in a range.
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*
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* This function generates a random number between \p min inclusive and
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@ -520,7 +520,59 @@ exit:
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/* END MERGE SLOT 5 */
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/* BEGIN MERGE SLOT 6 */
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/* BEGIN_CASE */
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void mpi_mod_raw_canonical_to_modulus_rep( const char *input_N, int rep,
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const char *input_A,
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const char *input_X )
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{
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mbedtls_mpi_mod_modulus N;
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mbedtls_mpi_mod_modulus_init( &N );
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mbedtls_mpi_uint *A = NULL;
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size_t A_limbs = 0;;
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mbedtls_mpi_uint *X = NULL;
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size_t X_limbs = 0;
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TEST_EQUAL( 0, mbedtls_test_read_mpi_modulus( &N, input_N, rep ) );
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TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &A, &A_limbs, input_A ) );
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TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &X, &X_limbs, input_X ) );
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TEST_EQUAL( 0, mbedtls_mpi_mod_raw_canonical_to_modulus_rep( A, &N ) );
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ASSERT_COMPARE( A, A_limbs * sizeof( mbedtls_mpi_uint ),
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X, X_limbs * sizeof( mbedtls_mpi_uint ) );
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exit:
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mbedtls_test_mpi_mod_modulus_free_with_limbs( &N );
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mbedtls_free( A );
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mbedtls_free( X );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mpi_mod_raw_modulus_to_canonical_rep( const char *input_N, int rep,
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const char *input_A,
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const char *input_X )
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{
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mbedtls_mpi_mod_modulus N;
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mbedtls_mpi_mod_modulus_init( &N );
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mbedtls_mpi_uint *A = NULL;
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size_t A_limbs = 0;;
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mbedtls_mpi_uint *X = NULL;
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size_t X_limbs = 0;
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TEST_EQUAL( 0, mbedtls_test_read_mpi_modulus( &N, input_N, rep ) );
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TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &A, &A_limbs, input_A ) );
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TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &X, &X_limbs, input_X ) );
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TEST_EQUAL( 0, mbedtls_mpi_mod_raw_modulus_to_canonical_rep( A, &N ) );
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ASSERT_COMPARE( A, A_limbs * sizeof( mbedtls_mpi_uint ),
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X, X_limbs * sizeof( mbedtls_mpi_uint ) );
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exit:
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mbedtls_test_mpi_mod_modulus_free_with_limbs( &N );
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mbedtls_free( A );
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mbedtls_free( X );
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}
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/* END_CASE */
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/* END MERGE SLOT 6 */
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/* BEGIN MERGE SLOT 7 */
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