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Bignum Mod: 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 18:02:46 +00:00
parent d3eed33709
commit 3e3fc91c33
3 changed files with 54 additions and 35 deletions
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10
library/bignum_mod.c
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@ -212,7 +212,8 @@ exit:
int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
const mbedtls_mpi_mod_modulus *m,
const unsigned char *buf,
size_t buflen )
size_t buflen,
mbedtls_mpi_mod_ext_rep ext_rep )
{
int ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
@ -223,7 +224,7 @@ int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
r->limbs == 0 || m->limbs == 0 )
goto cleanup;
ret = mbedtls_mpi_mod_raw_read( r->p, m, buf, buflen );
ret = mbedtls_mpi_mod_raw_read( r->p, m, buf, buflen, ext_rep );
if( ret != 0 )
goto cleanup;
@ -240,7 +241,8 @@ cleanup:
int mbedtls_mpi_mod_write( const mbedtls_mpi_mod_residue *r,
const mbedtls_mpi_mod_modulus *m,
unsigned char *buf,
size_t buflen )
size_t buflen,
mbedtls_mpi_mod_ext_rep ext_rep )
{
int ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
@ -254,7 +256,7 @@ int mbedtls_mpi_mod_write( const mbedtls_mpi_mod_residue *r,
if ( m->int_rep == MBEDTLS_MPI_MOD_REP_MONTGOMERY)
ret = mbedtls_mpi_mod_raw_from_mont_rep( r->p, m );
ret = mbedtls_mpi_mod_raw_write( r->p, m, buf, buflen );
ret = mbedtls_mpi_mod_raw_write( r->p, m, buf, buflen, ext_rep );
cleanup:
return ( ret );