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Add more validation to modulus life cycle

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Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath 2022-07-19 13:42:07 +01:00
parent 281ccda8a5
commit ba5c139e4c
1 changed files with 53 additions and 3 deletions
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56
library/bignum_new.c
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@ -30,6 +30,16 @@
#include "bignum_mod.h"
#include "bignum_mod_raw.h"
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_printf printf
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#define MPI_VALIDATE_RET( cond ) \
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_MPI_BAD_INPUT_DATA )
#define MPI_VALIDATE( cond ) \
@ -126,6 +136,16 @@ void mbedtls_mpi_mod_modulus_free( mbedtls_mpi_mod_modulus *m )
if ( m == NULL )
return;
switch( m->int_rep )
{
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
mbedtls_free( m->rep.mont ); break;
case MBEDTLS_MPI_MOD_REP_OPT_RED:
mbedtls_free( m->rep.mont ); break;
default:
break;
}
m->p = NULL;
m->n = 0;
m->plen = 0;
@ -139,16 +159,46 @@ int mbedtls_mpi_mod_modulus_setup( mbedtls_mpi_mod_modulus *m,
int ext_rep,
int int_rep )
{
int ret = 0;
if ( X == NULL || m == NULL )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
m->p = X;
m->n = nx;
m->ext_rep = ext_rep;
m->int_rep = int_rep;
m->plen = mpi_bitlen( X, nx );
return( 0 );
switch( ext_rep )
{
case MBEDTLS_MPI_MOD_EXT_REP_LE:
case MBEDTLS_MPI_MOD_EXT_REP_BE:
m->ext_rep = ext_rep; break;
default:
ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
goto exit;
}
switch( int_rep )
{
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
m->int_rep = int_rep;
m->rep.mont = NULL; break;
case MBEDTLS_MPI_MOD_REP_OPT_RED:
m->int_rep = int_rep;
m->rep.ored = NULL; break;
default:
ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
goto exit;
}
exit:
if( ret != 0 )
{
mbedtls_mpi_mod_modulus_free( m );
}
return( ret );
}
/* Check X to have at least n limbs and set it to 0. */