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bignum_mod: Refactored mbedtls_mpi_mod_read/write()

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This patch adjusts the I/O methods and the tests.
Documentation has also been updated to be more clear.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2022-11-24 11:04:11 +00:00 committed by Janos Follath
parent aed832ac16
commit 8b375451c5
3 changed files with 29 additions and 35 deletions
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14
library/bignum_mod.c
View File

@ -210,8 +210,8 @@ exit:
/* BEGIN MERGE SLOT 7 */
int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
mbedtls_mpi_mod_modulus *m,
unsigned char *buf,
const mbedtls_mpi_mod_modulus *m,
const unsigned char *buf,
size_t buflen )
{
int ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
@ -219,7 +219,7 @@ int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
if ( r == NULL || m == NULL )
goto cleanup;
if ( r->p == NULL || m->p == NULL || r->limbs > m->limbs ||\
if ( r->p == NULL || m->p == NULL || r->limbs > m->limbs ||
r->limbs == 0 || m->limbs == 0 )
goto cleanup;
@ -228,6 +228,8 @@ int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
if( ret != 0 )
goto cleanup;
r->limbs = m->limbs;
if (m->int_rep == MBEDTLS_MPI_MOD_REP_MONTGOMERY)
ret = mbedtls_mpi_mod_raw_to_mont_rep(r->p, m);
@ -235,8 +237,8 @@ cleanup:
return ( ret );
}
int mbedtls_mpi_mod_write( mbedtls_mpi_mod_residue *r,
mbedtls_mpi_mod_modulus *m,
int mbedtls_mpi_mod_write( const mbedtls_mpi_mod_residue *r,
const mbedtls_mpi_mod_modulus *m,
unsigned char *buf,
size_t buflen )
{
@ -245,7 +247,7 @@ int mbedtls_mpi_mod_write( mbedtls_mpi_mod_residue *r,
if ( r == NULL || m == NULL )
goto cleanup;
if ( r->p == NULL || m->p == NULL || r->limbs > m->limbs ||\
if ( r->p == NULL || m->p == NULL || r->limbs > m->limbs ||
r->limbs == 0 || m->limbs == 0 )
goto cleanup;

19
library/bignum_mod.h
View File

@ -177,8 +177,9 @@ void mbedtls_mpi_mod_modulus_free( mbedtls_mpi_mod_modulus *m );
/** Read public representation data stored in a buffer into a residue structure.
*
* The `mbedtls_mpi_mod_residue` and `mbedtls_mpi_mod_modulus` structures must
* be compatible. The data will be automatically converted into the appropriate
* representation based on the value of `m->int_rep field`.
* be compatible (Data in public representation is assumed to be in the m->ext_rep
* and will be padded to m->limbs). The data will be automatically converted
* into the appropriate internal representation based on the value of `m->int_rep`.
*
* \param r The address of the residue related to \p m. It must have as
* many limbs as the modulus \p m.
@ -193,15 +194,17 @@ void mbedtls_mpi_mod_modulus_free( mbedtls_mpi_mod_modulus *m );
* of \p m is invalid or \p X is not less than \p m.
*/
int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
mbedtls_mpi_mod_modulus *m,
unsigned char *buf,
const mbedtls_mpi_mod_modulus *m,
const unsigned char *buf,
size_t buflen );
/** Write residue data onto a buffer using public representation data.
*
* The `mbedtls_mpi_mod_residue` and `mbedtls_mpi_mod_modulus` structures must
* be compatible. The data will be automatically converted into the appropriate
* representation based on the value of `m->int_rep field`.
* be compatible (Data will be exported onto the bufer using the m->ext_rep
* and will be read as of m->limbs length).The data will be automatically
* converted from the appropriate internal representation based on the
* value of `m->int_rep field`.
*
* \param r The address of the residue related to \p m. It must have as
* many limbs as the modulus \p m.
@ -215,8 +218,8 @@ int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the external representation
* of \p m is invalid.
*/
int mbedtls_mpi_mod_write( mbedtls_mpi_mod_residue *r,
mbedtls_mpi_mod_modulus *m,
int mbedtls_mpi_mod_write( const mbedtls_mpi_mod_residue *r,
const mbedtls_mpi_mod_modulus *m,
unsigned char *buf,
size_t buflen );
/* END MERGE SLOT 7 */

31
tests/suites/test_suite_bignum_mod.function
View File

@ -110,13 +110,6 @@ exit:
/* BEGIN_CASE */
void mpi_mod_io_neg( )
{
#define IO_ZERO 0
#define IO_ONE 1
#define IO_MIN1 2
#define IO_MAX 3
#define IO_2LIMBS_MIN1 4
#define IO_2LIMBS 5
mbedtls_mpi_uint *N = NULL;
mbedtls_mpi_uint *R = NULL;
mbedtls_mpi_uint *N2 = NULL;
@ -130,15 +123,18 @@ void mpi_mod_io_neg( )
mbedtls_mpi_mod_modulus m2;
mbedtls_mpi_mod_residue rn = { NULL, 0 };
const char * s_data[ 6 ] = { "00", "01", "fe", "ff",
"7ffffffffffffffff0" ,"7ffffffffffffffff1" };
const char *hex_residue_single = "01";
const char *hex_modulus_single = "fe";
const char *hex_residue_multi = "7ffffffffffffffffffffffffffffff0";
const char *hex_modulus_multi = "7ffffffffffffffffffffffffffffff1";
const size_t buff_bytes = 1024;
/* Allocate the memory for intermediate data structures */
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &N, &n_limbs, s_data[ IO_MIN1 ] ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &R, &r_limbs, s_data[ IO_ONE ] ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &N2, &n2_limbs, s_data[ IO_2LIMBS ] ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &R2, &r2_limbs, s_data[ IO_2LIMBS_MIN1 ] ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &N, &n_limbs, hex_modulus_single ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &R, &r_limbs, hex_residue_single ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &N2, &n2_limbs, hex_modulus_multi ) );
TEST_EQUAL( 0, mbedtls_test_read_mpi_core( &R2, &r2_limbs, hex_residue_multi ) );
mbedtls_mpi_mod_modulus_init( &m );
mbedtls_mpi_mod_modulus_init( &m2 );
@ -155,7 +151,7 @@ void mpi_mod_io_neg( )
/* Pass for input_r < modulo */
TEST_EQUAL( 0, mbedtls_mpi_mod_read( &r, &m, r_buff, 1 ) );
/* input_r == modulo -1 */
/* Pass for input_r == modulo -1 */
memset( r_buff, 0xfd, buff_bytes );
TEST_EQUAL( 0, mbedtls_mpi_mod_read( &r, &m, r_buff, 1 ) );
@ -198,13 +194,6 @@ exit:
mbedtls_free( N2 );
mbedtls_free( R2 );
mbedtls_free( r_buff );
#undef IO_ZERO
#undef IO_ONE
#undef IO_MIN1
#undef IO_MAX
#undef IO_2LIMBS_MIN1
#undef IO_2LIMBS
}
/* END_CASE */