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Make ecp_get_type public

Browse source 
The ecp_get_type function comes handy in higher level modules and tests
as well. It is not inline anymore, to enable alternative implementations
to implement it for themselves.
This commit is contained in:
Janos Follath 2019-02-26 12:36:52 +00:00
parent 4ffdbe0979
commit df9295b7ec
3 changed files with 35 additions and 35 deletions
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15
include/mbedtls/ecp.h
View file

@ -99,6 +99,16 @@ typedef enum
*/
#define MBEDTLS_ECP_DP_MAX 12
/*
* Curve types
*/
typedef enum
{
MBEDTLS_ECP_TYPE_NONE = 0,
MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS, /* y^2 = x^3 + a x + b */
MBEDTLS_ECP_TYPE_MONTGOMERY, /* y^2 = x^3 + a x^2 + x */
} mbedtls_ecp_curve_type;
/**
* Curve information, for use by other modules.
*/
@ -417,6 +427,11 @@ void mbedtls_ecp_set_max_ops( unsigned max_ops );
int mbedtls_ecp_restart_is_enabled( void );
#endif /* MBEDTLS_ECP_RESTARTABLE */
/*
* Get the type of a curve
*/
mbedtls_ecp_curve_type mbedtls_ecp_get_type( const mbedtls_ecp_group *grp );
/**
* \brief This function retrieves the information defined in
* mbedtls_ecp_curve_info() for all supported curves in order

48
library/ecp.c
View file

@ -363,16 +363,6 @@ int mbedtls_ecp_check_budget( const mbedtls_ecp_group *grp,
#define ECP_MONTGOMERY
#endif
/*
* Curve types: internal for now, might be exposed later
*/
typedef enum
{
ECP_TYPE_NONE = 0,
ECP_TYPE_SHORT_WEIERSTRASS, /* y^2 = x^3 + a x + b */
ECP_TYPE_MONTGOMERY, /* y^2 = x^3 + a x^2 + x */
} ecp_curve_type;
/*
* List of supported curves:
* - internal ID
@ -522,15 +512,15 @@ const mbedtls_ecp_curve_info *mbedtls_ecp_curve_info_from_name( const char *name
/*
* Get the type of a curve
*/
static inline ecp_curve_type ecp_get_type( const mbedtls_ecp_group *grp )
mbedtls_ecp_curve_type mbedtls_ecp_get_type( const mbedtls_ecp_group *grp )
{
if( grp->G.X.p == NULL )
return( ECP_TYPE_NONE );
return( MBEDTLS_ECP_TYPE_NONE );
if( grp->G.Y.p == NULL )
return( ECP_TYPE_MONTGOMERY );
return( MBEDTLS_ECP_TYPE_MONTGOMERY );
else
return( ECP_TYPE_SHORT_WEIERSTRASS );
return( MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS );
}
/*
@ -748,7 +738,7 @@ int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp,
plen = mbedtls_mpi_size( &grp->P );
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
{
*olen = plen;
if( buflen < *olen )
@ -758,7 +748,7 @@ int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp,
}
#endif
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
{
/*
* Common case: P == 0
@ -821,7 +811,7 @@ int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp,
plen = mbedtls_mpi_size( &grp->P );
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
{
if( plen != ilen )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
@ -837,7 +827,7 @@ int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp,
}
#endif
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
{
if( buf[0] == 0x00 )
{
@ -2394,11 +2384,11 @@ int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
MBEDTLS_MPI_CHK( ecp_mul_mxz( grp, R, m, P, f_rng, p_rng ) );
#endif
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
MBEDTLS_MPI_CHK( ecp_mul_comb( grp, R, m, P, f_rng, p_rng, rs_ctx ) );
#endif
@ -2537,7 +2527,7 @@ int mbedtls_ecp_muladd_restartable(
ECP_VALIDATE_RET( n != NULL );
ECP_VALIDATE_RET( Q != NULL );
if( ecp_get_type( grp ) != ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) != MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
mbedtls_ecp_point_init( &mP );
@ -2657,11 +2647,11 @@ int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp,
return( MBEDTLS_ERR_ECP_INVALID_KEY );
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
return( ecp_check_pubkey_mx( grp, pt ) );
#endif
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
return( ecp_check_pubkey_sw( grp, pt ) );
#endif
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
@ -2677,7 +2667,7 @@ int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp,
ECP_VALIDATE_RET( d != NULL );
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
{
/* see RFC 7748 sec. 5 para. 5 */
if( mbedtls_mpi_get_bit( d, 0 ) != 0 ||
@ -2693,7 +2683,7 @@ int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp,
}
#endif /* ECP_MONTGOMERY */
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
{
/* see SEC1 3.2 */
if( mbedtls_mpi_cmp_int( d, 1 ) < 0 ||
@ -2725,7 +2715,7 @@ int mbedtls_ecp_gen_privkey( const mbedtls_ecp_group *grp,
n_size = ( grp->nbits + 7 ) / 8;
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
{
/* [M225] page 5 */
size_t b;
@ -2753,7 +2743,7 @@ int mbedtls_ecp_gen_privkey( const mbedtls_ecp_group *grp,
#endif /* ECP_MONTGOMERY */
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
{
/* SEC1 3.2.1: Generate d such that 1 <= n < N */
int count = 0;
@ -2864,7 +2854,7 @@ int mbedtls_ecp_read_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
#if defined(ECP_MONTGOMERY)
if( ecp_get_type( &key->grp ) == ECP_TYPE_MONTGOMERY )
if( mbedtls_ecp_get_type( &key->grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
{
/*
* If it is Curve25519 curve then mask the key as mandated by RFC7748
@ -2899,7 +2889,7 @@ int mbedtls_ecp_read_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
#endif
#if defined(ECP_SHORTWEIERSTRASS)
if( ecp_get_type( &key->grp ) == ECP_TYPE_SHORT_WEIERSTRASS )
if( mbedtls_ecp_get_type( &key->grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
{
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &key->d, buf, buflen ) );

7
tests/suites/test_suite_ecp.function
View file

@ -760,12 +760,7 @@ void ecp_read_binary( int id, data_t * buf, char * x, char * y, char * z,
if( ret == 0 )
{
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.X, &X ) == 0 );
/*
* At the time of writing, the following condition is equivalent with
* if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
* but has the advantage of not using internal symbols.
*/
if( grp.G.Y.p == NULL )
if( mbedtls_ecp_get_type( &grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
{
TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, 0 ) == 0 );
TEST_ASSERT( P.Y.p == NULL );