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Implement parameter validation for ECP module

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This commit is contained in:
Hanno Becker 2018-12-14 15:08:03 +00:00
parent ebffa7995b
commit 4f8e8e5805
2 changed files with 125 additions and 23 deletions
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140
library/ecp.c
View File

@ -86,6 +86,12 @@
#if !defined(MBEDTLS_ECP_ALT)
/* Parameter validation macros based on platform_util.h */
#define ECP_VALIDATE_RET( cond ) \
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
#define ECP_VALIDATE( cond ) \
MBEDTLS_INTERNAL_VALIDATE( cond )
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
@ -268,6 +274,8 @@ int mbedtls_ecp_check_budget( const mbedtls_ecp_group *grp,
mbedtls_ecp_restart_ctx *rs_ctx,
unsigned ops )
{
ECP_VALIDATE_RET( grp != NULL );
if( rs_ctx != NULL && ecp_max_ops != 0 )
{
/* scale depending on curve size: the chosen reference is 256-bit,
@ -526,8 +534,7 @@ static inline ecp_curve_type ecp_get_type( const mbedtls_ecp_group *grp )
*/
void mbedtls_ecp_point_init( mbedtls_ecp_point *pt )
{
if( pt == NULL )
return;
ECP_VALIDATE( pt != NULL );
mbedtls_mpi_init( &pt->X );
mbedtls_mpi_init( &pt->Y );
@ -539,8 +546,7 @@ void mbedtls_ecp_point_init( mbedtls_ecp_point *pt )
*/
void mbedtls_ecp_group_init( mbedtls_ecp_group *grp )
{
if( grp == NULL )
return;
ECP_VALIDATE( grp != NULL );
grp->id = MBEDTLS_ECP_DP_NONE;
mbedtls_mpi_init( &grp->P );
@ -564,8 +570,7 @@ void mbedtls_ecp_group_init( mbedtls_ecp_group *grp )
*/
void mbedtls_ecp_keypair_init( mbedtls_ecp_keypair *key )
{
if( key == NULL )
return;
ECP_VALIDATE( key != NULL );
mbedtls_ecp_group_init( &key->grp );
mbedtls_mpi_init( &key->d );
@ -633,6 +638,8 @@ void mbedtls_ecp_keypair_free( mbedtls_ecp_keypair *key )
int mbedtls_ecp_copy( mbedtls_ecp_point *P, const mbedtls_ecp_point *Q )
{
int ret;
ECP_VALIDATE_RET( P != NULL );
ECP_VALIDATE_RET( Q != NULL );
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &P->X, &Q->X ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &P->Y, &Q->Y ) );
@ -647,7 +654,10 @@ cleanup:
*/
int mbedtls_ecp_group_copy( mbedtls_ecp_group *dst, const mbedtls_ecp_group *src )
{
return mbedtls_ecp_group_load( dst, src->id );
ECP_VALIDATE_RET( dst != NULL );
ECP_VALIDATE_RET( src != NULL );
return( mbedtls_ecp_group_load( dst, src->id ) );
}
/*
@ -656,6 +666,7 @@ int mbedtls_ecp_group_copy( mbedtls_ecp_group *dst, const mbedtls_ecp_group *src
int mbedtls_ecp_set_zero( mbedtls_ecp_point *pt )
{
int ret;
ECP_VALIDATE_RET( pt != NULL );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pt->X , 1 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pt->Y , 1 ) );
@ -670,6 +681,8 @@ cleanup:
*/
int mbedtls_ecp_is_zero( mbedtls_ecp_point *pt )
{
ECP_VALIDATE_RET( pt != NULL );
return( mbedtls_mpi_cmp_int( &pt->Z, 0 ) == 0 );
}
@ -679,6 +692,9 @@ int mbedtls_ecp_is_zero( mbedtls_ecp_point *pt )
int mbedtls_ecp_point_cmp( const mbedtls_ecp_point *P,
const mbedtls_ecp_point *Q )
{
ECP_VALIDATE_RET( P != NULL );
ECP_VALIDATE_RET( Q != NULL );
if( mbedtls_mpi_cmp_mpi( &P->X, &Q->X ) == 0 &&
mbedtls_mpi_cmp_mpi( &P->Y, &Q->Y ) == 0 &&
mbedtls_mpi_cmp_mpi( &P->Z, &Q->Z ) == 0 )
@ -696,6 +712,9 @@ int mbedtls_ecp_point_read_string( mbedtls_ecp_point *P, int radix,
const char *x, const char *y )
{
int ret;
ECP_VALIDATE_RET( P != NULL );
ECP_VALIDATE_RET( x != NULL );
ECP_VALIDATE_RET( y != NULL );
MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P->X, radix, x ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P->Y, radix, y ) );
@ -708,16 +727,19 @@ cleanup:
/*
* Export a point into unsigned binary data (SEC1 2.3.3)
*/
int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *P,
int format, size_t *olen,
unsigned char *buf, size_t buflen )
int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp,
const mbedtls_ecp_point *P,
int format, size_t *olen,
unsigned char *buf, size_t buflen )
{
int ret = 0;
size_t plen;
if( format != MBEDTLS_ECP_PF_UNCOMPRESSED &&
format != MBEDTLS_ECP_PF_COMPRESSED )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( P != NULL );
ECP_VALIDATE_RET( olen != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( format == MBEDTLS_ECP_PF_UNCOMPRESSED ||
format == MBEDTLS_ECP_PF_COMPRESSED );
/*
* Common case: P == 0
@ -764,11 +786,15 @@ cleanup:
/*
* Import a point from unsigned binary data (SEC1 2.3.4)
*/
int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt,
const unsigned char *buf, size_t ilen )
int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp,
mbedtls_ecp_point *pt,
const unsigned char *buf, size_t ilen )
{
int ret;
size_t plen;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( pt != NULL );
ECP_VALIDATE_RET( buf != NULL );
if( ilen < 1 )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
@ -803,11 +829,16 @@ cleanup:
* opaque point <1..2^8-1>;
* } ECPoint;
*/
int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt,
const unsigned char **buf, size_t buf_len )
int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp,
mbedtls_ecp_point *pt,
const unsigned char **buf, size_t buf_len )
{
unsigned char data_len;
const unsigned char *buf_start;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( pt != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( *buf != NULL );
/*
* We must have at least two bytes (1 for length, at least one for data)
@ -825,7 +856,7 @@ int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp, mbedtls_ecp_point
buf_start = *buf;
*buf += data_len;
return mbedtls_ecp_point_read_binary( grp, pt, buf_start, data_len );
return( mbedtls_ecp_point_read_binary( grp, pt, buf_start, data_len ) );
}
/*
@ -839,6 +870,12 @@ int mbedtls_ecp_tls_write_point( const mbedtls_ecp_group *grp, const mbedtls_ecp
unsigned char *buf, size_t blen )
{
int ret;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( pt != NULL );
ECP_VALIDATE_RET( olen != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( format == MBEDTLS_ECP_PF_UNCOMPRESSED ||
format == MBEDTLS_ECP_PF_COMPRESSED );
/*
* buffer length must be at least one, for our length byte
@ -867,11 +904,14 @@ int mbedtls_ecp_tls_read_group( mbedtls_ecp_group *grp,
{
int ret;
mbedtls_ecp_group_id grp_id;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( *buf != NULL );
if( ( ret = mbedtls_ecp_tls_read_group_id( &grp_id, buf, len ) ) != 0 )
return( ret );
return mbedtls_ecp_group_load( grp, grp_id );
return( mbedtls_ecp_group_load( grp, grp_id ) );
}
/*
@ -883,6 +923,9 @@ int mbedtls_ecp_tls_read_group_id( mbedtls_ecp_group_id *grp,
{
uint16_t tls_id;
const mbedtls_ecp_curve_info *curve_info;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( *buf != NULL );
/*
* We expect at least three bytes (see below)
@ -918,6 +961,9 @@ int mbedtls_ecp_tls_write_group( const mbedtls_ecp_group *grp, size_t *olen,
unsigned char *buf, size_t blen )
{
const mbedtls_ecp_curve_info *curve_info;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( olen != NULL );
if( ( curve_info = mbedtls_ecp_curve_info_from_grp_id( grp->id ) ) == NULL )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
@ -2276,6 +2322,10 @@ int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
#if defined(MBEDTLS_ECP_INTERNAL_ALT)
char is_grp_capable = 0;
#endif
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( R != NULL );
ECP_VALIDATE_RET( m != NULL );
ECP_VALIDATE_RET( P != NULL );
#if defined(MBEDTLS_ECP_RESTARTABLE)
/* reset ops count for this call if top-level */
@ -2333,6 +2383,10 @@ int mbedtls_ecp_mul( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( R != NULL );
ECP_VALIDATE_RET( m != NULL );
ECP_VALIDATE_RET( P != NULL );
return( mbedtls_ecp_mul_restartable( grp, R, m, P, f_rng, p_rng, NULL ) );
}
@ -2435,6 +2489,12 @@ int mbedtls_ecp_muladd_restartable(
#if defined(MBEDTLS_ECP_INTERNAL_ALT)
char is_grp_capable = 0;
#endif
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( R != NULL );
ECP_VALIDATE_RET( m != NULL );
ECP_VALIDATE_RET( P != NULL );
ECP_VALIDATE_RET( n != NULL );
ECP_VALIDATE_RET( Q != NULL );
if( ecp_get_type( grp ) != ECP_TYPE_SHORT_WEIERSTRASS )
return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
@ -2517,6 +2577,12 @@ int mbedtls_ecp_muladd( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
const mbedtls_mpi *n, const mbedtls_ecp_point *Q )
{
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( R != NULL );
ECP_VALIDATE_RET( m != NULL );
ECP_VALIDATE_RET( P != NULL );
ECP_VALIDATE_RET( n != NULL );
ECP_VALIDATE_RET( Q != NULL );
return( mbedtls_ecp_muladd_restartable( grp, R, m, P, n, Q, NULL ) );
}
@ -2539,8 +2605,12 @@ static int ecp_check_pubkey_mx( const mbedtls_ecp_group *grp, const mbedtls_ecp_
/*
* Check that a point is valid as a public key
*/
int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *pt )
int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp,
const mbedtls_ecp_point *pt )
{
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( pt != NULL );
/* Must use affine coordinates */
if( mbedtls_mpi_cmp_int( &pt->Z, 1 ) != 0 )
return( MBEDTLS_ERR_ECP_INVALID_KEY );
@ -2559,8 +2629,12 @@ int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp, const mbedtls_ecp_po
/*
* Check that an mbedtls_mpi is valid as a private key
*/
int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp, const mbedtls_mpi *d )
int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp,
const mbedtls_mpi *d )
{
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( d != NULL );
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
{
@ -2601,7 +2675,13 @@ int mbedtls_ecp_gen_privkey( const mbedtls_ecp_group *grp,
void *p_rng )
{
int ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
size_t n_size = ( grp->nbits + 7 ) / 8;
size_t n_size;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( d != NULL );
ECP_VALIDATE_RET( f_rng != NULL );
n_size = ( grp->nbits + 7 ) / 8;
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
@ -2680,6 +2760,11 @@ int mbedtls_ecp_gen_keypair_base( mbedtls_ecp_group *grp,
void *p_rng )
{
int ret;
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( d != NULL );
ECP_VALIDATE_RET( G != NULL );
ECP_VALIDATE_RET( Q != NULL );
ECP_VALIDATE_RET( f_rng != NULL );
MBEDTLS_MPI_CHK( mbedtls_ecp_gen_privkey( grp, d, f_rng, p_rng ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( grp, Q, d, G, f_rng, p_rng ) );
@ -2696,6 +2781,11 @@ int mbedtls_ecp_gen_keypair( mbedtls_ecp_group *grp,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
ECP_VALIDATE_RET( grp != NULL );
ECP_VALIDATE_RET( d != NULL );
ECP_VALIDATE_RET( Q != NULL );
ECP_VALIDATE_RET( f_rng != NULL );
return( mbedtls_ecp_gen_keypair_base( grp, &grp->G, d, Q, f_rng, p_rng ) );
}
@ -2706,6 +2796,8 @@ int mbedtls_ecp_gen_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
int ret;
ECP_VALIDATE_RET( key != NULL );
ECP_VALIDATE_RET( f_rng != NULL );
if( ( ret = mbedtls_ecp_group_load( &key->grp, grp_id ) ) != 0 )
return( ret );
@ -2721,6 +2813,8 @@ int mbedtls_ecp_check_pub_priv( const mbedtls_ecp_keypair *pub, const mbedtls_ec
int ret;
mbedtls_ecp_point Q;
mbedtls_ecp_group grp;
ECP_VALIDATE_RET( pub != NULL );
ECP_VALIDATE_RET( prv != NULL );
if( pub->grp.id == MBEDTLS_ECP_DP_NONE ||
pub->grp.id != prv->grp.id ||

8
library/ecp_curves.c
View File

@ -28,11 +28,18 @@
#if defined(MBEDTLS_ECP_C)
#include "mbedtls/ecp.h"
#include "mbedtls/platform_util.h"
#include <string.h>
#if !defined(MBEDTLS_ECP_ALT)
/* Parameter validation macros based on platform_util.h */
#define ECP_VALIDATE_RET( cond ) \
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
#define ECP_VALIDATE( cond ) \
MBEDTLS_INTERNAL_VALIDATE( cond )
#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
!defined(inline) && !defined(__cplusplus)
#define inline __inline
@ -746,6 +753,7 @@ cleanup:
*/
int mbedtls_ecp_group_load( mbedtls_ecp_group *grp, mbedtls_ecp_group_id id )
{
ECP_VALIDATE_RET( grp != NULL );
mbedtls_ecp_group_free( grp );
grp->id = id;