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mbedtls/tests/suites/test_suite_dhm.function
Gilles Peskine 20edee7b17 Use mbedtls_test_read_mpi in test suites 
Replace calls to mbedtls_mpi_read_string() with a wrapper
mbedtls_test_read_mpi() when reading test data except for the purpose
of testing mbedtls_mpi_read_string() itself. The wrapper lets the test
data control precisely how many limbs the constructed MPI has.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-22 12:44:05 +02:00

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/* BEGIN_HEADER */
#include "mbedtls/dhm.h"
int check_get_value( const mbedtls_dhm_context *ctx,
mbedtls_dhm_parameter param,
const mbedtls_mpi *expected )
{
mbedtls_mpi actual;
int ok = 0;
mbedtls_mpi_init( &actual );
TEST_ASSERT( mbedtls_dhm_get_value( ctx, param, &actual ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &actual, expected ) == 0 );
ok = 1;
exit:
mbedtls_mpi_free( &actual );
return( ok );
}
/* Sanity checks on a Diffie-Hellman parameter: check the length-value
* syntax and check that the value is the expected one (taken from the
* DHM context by the caller). */
static int check_dhm_param_output( const mbedtls_mpi *expected,
const unsigned char *buffer,
size_t size,
size_t *offset )
{
size_t n;
mbedtls_mpi actual;
int ok = 0;
mbedtls_mpi_init( &actual );
++mbedtls_test_info.step;
TEST_ASSERT( size >= *offset + 2 );
n = ( buffer[*offset] << 8 ) | buffer[*offset + 1];
*offset += 2;
/* The DHM param output from Mbed TLS has leading zeros stripped, as
* permitted but not required by RFC 5246 \S4.4. */
TEST_EQUAL( n, mbedtls_mpi_size( expected ) );
TEST_ASSERT( size >= *offset + n );
TEST_EQUAL( 0, mbedtls_mpi_read_binary( &actual, buffer + *offset, n ) );
TEST_EQUAL( 0, mbedtls_mpi_cmp_mpi( expected, &actual ) );
*offset += n;
ok = 1;
exit:
mbedtls_mpi_free( &actual );
return( ok );
}
/* Sanity checks on Diffie-Hellman parameters: syntax, range, and comparison
* against the context. */
static int check_dhm_params( const mbedtls_dhm_context *ctx,
size_t x_size,
const unsigned char *ske, size_t ske_len )
{
size_t offset = 0;
/* Check that ctx->X and ctx->GX are within range. */
TEST_ASSERT( mbedtls_mpi_cmp_int( &ctx->X, 1 ) > 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) < 0 );
TEST_ASSERT( mbedtls_mpi_size( &ctx->X ) <= x_size );
TEST_ASSERT( mbedtls_mpi_cmp_int( &ctx->GX, 1 ) > 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx->GX, &ctx->P ) < 0 );
/* Check ske: it must contain P, G and G^X, each prefixed with a
* 2-byte size. */
if( !check_dhm_param_output( &ctx->P, ske, ske_len, &offset ) )
goto exit;
if( !check_dhm_param_output( &ctx->G, ske, ske_len, &offset ) )
goto exit;
if( !check_dhm_param_output( &ctx->GX, ske, ske_len, &offset ) )
goto exit;
TEST_EQUAL( offset, ske_len );
return( 1 );
exit:
return( 0 );
}
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_DHM_C:MBEDTLS_BIGNUM_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
void dhm_do_dhm( int radix_P, char *input_P, int x_size,
int radix_G, char *input_G, int result )
{
mbedtls_dhm_context ctx_srv;
mbedtls_dhm_context ctx_cli;
unsigned char ske[1000];
unsigned char *p = ske;
unsigned char pub_cli[1000];
unsigned char sec_srv[1000];
unsigned char sec_cli[1000];
size_t ske_len = 0;
size_t pub_cli_len = 0;
size_t sec_srv_len;
size_t sec_cli_len;
int i;
mbedtls_test_rnd_pseudo_info rnd_info;
mbedtls_dhm_init( &ctx_srv );
mbedtls_dhm_init( &ctx_cli );
memset( ske, 0x00, 1000 );
memset( pub_cli, 0x00, 1000 );
memset( sec_srv, 0x00, 1000 );
memset( sec_cli, 0x00, 1000 );
memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );
/*
* Set params
*/
TEST_ASSERT( mbedtls_test_read_mpi( &ctx_srv.P, radix_P, input_P ) == 0 );
TEST_ASSERT( mbedtls_test_read_mpi( &ctx_srv.G, radix_G, input_G ) == 0 );
pub_cli_len = mbedtls_mpi_size( &ctx_srv.P );
TEST_ASSERT( check_get_value( &ctx_srv, MBEDTLS_DHM_PARAM_P, &ctx_srv.P ) );
TEST_ASSERT( check_get_value( &ctx_srv, MBEDTLS_DHM_PARAM_G, &ctx_srv.G ) );
/*
* First key exchange
*/
mbedtls_test_set_step( 10 );
TEST_ASSERT( mbedtls_dhm_make_params( &ctx_srv, x_size, ske, &ske_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == result );
if ( result != 0 )
goto exit;
if( !check_dhm_params( &ctx_srv, x_size, ske, ske_len ) )
goto exit;
ske[ske_len++] = 0;
ske[ske_len++] = 0;
TEST_ASSERT( mbedtls_dhm_read_params( &ctx_cli, &p, ske + ske_len ) == 0 );
/* The domain parameters must be the same on both side. */
TEST_ASSERT( check_get_value( &ctx_cli, MBEDTLS_DHM_PARAM_P, &ctx_srv.P ) );
TEST_ASSERT( check_get_value( &ctx_cli, MBEDTLS_DHM_PARAM_G, &ctx_srv.G ) );
TEST_ASSERT( mbedtls_dhm_make_public( &ctx_cli, x_size, pub_cli, pub_cli_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( mbedtls_dhm_read_public( &ctx_srv, pub_cli, pub_cli_len ) == 0 );
TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ),
&sec_srv_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, sizeof( sec_cli ),
&sec_cli_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( sec_srv_len == sec_cli_len );
TEST_ASSERT( sec_srv_len != 0 );
TEST_ASSERT( memcmp( sec_srv, sec_cli, sec_srv_len ) == 0 );
/* Internal value checks */
TEST_ASSERT( check_get_value( &ctx_cli, MBEDTLS_DHM_PARAM_X, &ctx_cli.X ) );
TEST_ASSERT( check_get_value( &ctx_srv, MBEDTLS_DHM_PARAM_X, &ctx_srv.X ) );
/* Cross-checks */
TEST_ASSERT( check_get_value( &ctx_cli, MBEDTLS_DHM_PARAM_GX, &ctx_srv.GY ) );
TEST_ASSERT( check_get_value( &ctx_cli, MBEDTLS_DHM_PARAM_GY, &ctx_srv.GX ) );
TEST_ASSERT( check_get_value( &ctx_cli, MBEDTLS_DHM_PARAM_K, &ctx_srv.K ) );
TEST_ASSERT( check_get_value( &ctx_srv, MBEDTLS_DHM_PARAM_GX, &ctx_cli.GY ) );
TEST_ASSERT( check_get_value( &ctx_srv, MBEDTLS_DHM_PARAM_GY, &ctx_cli.GX ) );
TEST_ASSERT( check_get_value( &ctx_srv, MBEDTLS_DHM_PARAM_K, &ctx_cli.K ) );
/* Re-do calc_secret on server a few times to test update of blinding values */
for( i = 0; i < 3; i++ )
{
mbedtls_test_set_step( 20 + i );
sec_srv_len = 1000;
TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv,
sizeof( sec_srv ), &sec_srv_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( sec_srv_len == sec_cli_len );
TEST_ASSERT( sec_srv_len != 0 );
TEST_ASSERT( memcmp( sec_srv, sec_cli, sec_srv_len ) == 0 );
}
/*
* Second key exchange to test change of blinding values on server
*/
p = ske;
mbedtls_test_set_step( 30 );
TEST_ASSERT( mbedtls_dhm_make_params( &ctx_srv, x_size, ske, &ske_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
if( !check_dhm_params( &ctx_srv, x_size, ske, ske_len ) )
goto exit;
ske[ske_len++] = 0;
ske[ske_len++] = 0;
TEST_ASSERT( mbedtls_dhm_read_params( &ctx_cli, &p, ske + ske_len ) == 0 );
TEST_ASSERT( mbedtls_dhm_make_public( &ctx_cli, x_size, pub_cli, pub_cli_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( mbedtls_dhm_read_public( &ctx_srv, pub_cli, pub_cli_len ) == 0 );
TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ),
&sec_srv_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, sizeof( sec_cli ),
&sec_cli_len,
&mbedtls_test_rnd_pseudo_rand,
&rnd_info ) == 0 );
TEST_ASSERT( sec_srv_len == sec_cli_len );
TEST_ASSERT( sec_srv_len != 0 );
TEST_ASSERT( memcmp( sec_srv, sec_cli, sec_srv_len ) == 0 );
exit:
mbedtls_dhm_free( &ctx_srv );
mbedtls_dhm_free( &ctx_cli );
}
/* END_CASE */
/* BEGIN_CASE */
void dhm_make_public( int P_bytes, int radix_G, char *input_G, int result )
{
mbedtls_mpi P, G;
mbedtls_dhm_context ctx;
unsigned char output[MBEDTLS_MPI_MAX_SIZE];
mbedtls_mpi_init( &P );
mbedtls_mpi_init( &G );
mbedtls_dhm_init( &ctx );
TEST_ASSERT( mbedtls_mpi_lset( &P, 1 ) == 0 );
TEST_ASSERT( mbedtls_mpi_shift_l( &P, ( P_bytes * 8 ) - 1 ) == 0 );
TEST_ASSERT( mbedtls_mpi_set_bit( &P, 0, 1 ) == 0 );
TEST_ASSERT( mbedtls_test_read_mpi( &G, radix_G, input_G ) == 0 );
TEST_ASSERT( mbedtls_dhm_set_group( &ctx, &P, &G ) == 0 );
TEST_ASSERT( mbedtls_dhm_make_public( &ctx, (int) mbedtls_mpi_size( &P ),
output, sizeof(output),
&mbedtls_test_rnd_pseudo_rand,
NULL ) == result );
exit:
mbedtls_mpi_free( &P );
mbedtls_mpi_free( &G );
mbedtls_dhm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_FS_IO */
void dhm_file( char * filename, char * p, char * g, int len )
{
mbedtls_dhm_context ctx;
mbedtls_mpi P, G;
mbedtls_dhm_init( &ctx );
mbedtls_mpi_init( &P ); mbedtls_mpi_init( &G );
TEST_ASSERT( mbedtls_test_read_mpi( &P, 16, p ) == 0 );
TEST_ASSERT( mbedtls_test_read_mpi( &G, 16, g ) == 0 );
TEST_ASSERT( mbedtls_dhm_parse_dhmfile( &ctx, filename ) == 0 );
TEST_EQUAL( mbedtls_dhm_get_len( &ctx ), (size_t) len );
TEST_EQUAL( mbedtls_dhm_get_bitlen( &ctx ), mbedtls_mpi_bitlen( &P ) );
TEST_ASSERT( check_get_value( &ctx, MBEDTLS_DHM_PARAM_P, &P ) );
TEST_ASSERT( check_get_value( &ctx, MBEDTLS_DHM_PARAM_G, &G ) );
exit:
mbedtls_mpi_free( &P ); mbedtls_mpi_free( &G );
mbedtls_dhm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void dhm_selftest( )
{
TEST_ASSERT( mbedtls_dhm_self_test( 1 ) == 0 );
}
/* END_CASE */
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