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Bignum Mod Raw: pass endianness as a parameter

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The external representation before included more than just endianness
(like reading in Mongtomery curve scalars or converting hashes to
numbers in a standard compliant way).

These are higher level concepts and are out of scope for Bignum and for
the modulus structure.

Passing endianness as a parameter is a step towards removing it from the
modulus structure.

Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath 2022-11-24 17:42:02 +00:00
parent 50cd4b842b
commit d3eed33709
3 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
library/bignum_mod_raw.c
View File

@ -52,11 +52,12 @@ void mbedtls_mpi_mod_raw_cond_swap( mbedtls_mpi_uint *X,
int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *m,
const unsigned char *input,
size_t input_length )
size_t input_length,
mbedtls_mpi_mod_ext_rep ext_rep )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
switch( m->ext_rep )
switch( ext_rep )
{
case MBEDTLS_MPI_MOD_EXT_REP_LE:
ret = mbedtls_mpi_core_read_le( X, m->limbs,
@ -87,9 +88,10 @@ cleanup:
int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
const mbedtls_mpi_mod_modulus *m,
unsigned char *output,
size_t output_length )
size_t output_length,
mbedtls_mpi_mod_ext_rep ext_rep )
{
switch( m->ext_rep )
switch( ext_rep )
{
case MBEDTLS_MPI_MOD_EXT_REP_LE:
return( mbedtls_mpi_core_write_le( A, m->limbs,

8
library/bignum_mod_raw.h
View File

@ -106,6 +106,7 @@ void mbedtls_mpi_mod_raw_cond_swap( mbedtls_mpi_uint *X,
* \param[in] m The address of the modulus related to \p X.
* \param[in] input The input buffer to import from.
* \param input_length The length in bytes of \p input.
* \param ext_rep The endianness of the number in the input buffer.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p X isn't
@ -116,7 +117,8 @@ void mbedtls_mpi_mod_raw_cond_swap( mbedtls_mpi_uint *X,
int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *m,
const unsigned char *input,
size_t input_length );
size_t input_length,
mbedtls_mpi_mod_ext_rep ext_rep );
/** Export A into unsigned binary data.
*
@ -126,6 +128,7 @@ int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,
* \param[in] m The address of the modulus related to \p A.
* \param[out] output The output buffer to export to.
* \param output_length The length in bytes of \p output.
* \param ext_rep The endianness in which the number should be written into the output buffer.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p output isn't
@ -136,7 +139,8 @@ int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,
int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
const mbedtls_mpi_mod_modulus *m,
unsigned char *output,
size_t output_length );
size_t output_length,
mbedtls_mpi_mod_ext_rep ext_rep );
/* BEGIN MERGE SLOT 1 */

8
tests/suites/test_suite_bignum_mod_raw.function
View File

@ -54,17 +54,17 @@ void mpi_mod_raw_io( data_t *input, int nb_int, int nx_32_int,
TEST_EQUAL( ret, 0 );
if( iendian == MBEDTLS_MPI_MOD_EXT_REP_INVALID && iret != 0 )
m.ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
endian = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
ret = mbedtls_mpi_mod_raw_read( X, &m, input->x, input->len );
ret = mbedtls_mpi_mod_raw_read( X, &m, input->x, input->len, endian );
TEST_EQUAL( ret, iret );
if( iret == 0 )
{
if( iendian == MBEDTLS_MPI_MOD_EXT_REP_INVALID && oret != 0 )
m.ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
endian = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
ret = mbedtls_mpi_mod_raw_write( X, &m, buf, nb );
ret = mbedtls_mpi_mod_raw_write( X, &m, buf, nb, endian );
TEST_EQUAL( ret, oret );
}