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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
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10
library/bignum_mod_raw.c
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@ -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,