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ECDH: Hide context from tests

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The tests for the ECDH key exchange that use the context accessed it
directly. This can't work with the new context, where we can't make any
assumptions about the implementation of the context. This commit works
around this problem and comes with the cost of allocating an extra
structures on the stack when executing the test.

One of the tests is testing an older interface for the sake of backward
compatibility. The new ECDH context is not backward compatible and this
test doesn't make any sense for it, therefore we skip this test in
non-legacy mode.
This commit is contained in:
Janos Follath 2018-10-30 14:08:52 +00:00
parent 3fbdadad7b
commit 36c5f7fe9b
1 changed files with 20 additions and 9 deletions
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25
tests/suites/test_suite_ecdh.function
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@ -129,6 +129,8 @@ void ecdh_exchange( int id )
const unsigned char *vbuf; const unsigned char *vbuf;
size_t len; size_t len;
rnd_pseudo_info rnd_info; rnd_pseudo_info rnd_info;
unsigned char res_buf[1000];
size_t res_len;
mbedtls_ecdh_init( &srv ); mbedtls_ecdh_init( &srv );
mbedtls_ecdh_init( &cli ); mbedtls_ecdh_init( &cli );
@ -148,8 +150,10 @@ void ecdh_exchange( int id )
TEST_ASSERT( mbedtls_ecdh_calc_secret( &srv, &len, buf, 1000, TEST_ASSERT( mbedtls_ecdh_calc_secret( &srv, &len, buf, 1000,
&rnd_pseudo_rand, &rnd_info ) == 0 ); &rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( mbedtls_ecdh_calc_secret( &cli, &len, buf, 1000, NULL, NULL ) == 0 ); TEST_ASSERT( mbedtls_ecdh_calc_secret( &cli, &res_len, res_buf, 1000,
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &srv.z, &cli.z ) == 0 ); NULL, NULL ) == 0 );
TEST_ASSERT( len == res_len );
TEST_ASSERT( memcmp( buf, res_buf, len ) == 0 );
exit: exit:
mbedtls_ecdh_free( &srv ); mbedtls_ecdh_free( &srv );
@ -172,7 +176,9 @@ void ecdh_restart( int id, char *dA_str, char *dB_str, char *z_str,
unsigned char rnd_buf_B[MBEDTLS_ECP_MAX_BYTES]; unsigned char rnd_buf_B[MBEDTLS_ECP_MAX_BYTES];
rnd_buf_info rnd_info_A, rnd_info_B; rnd_buf_info rnd_info_A, rnd_info_B;
int cnt_restart; int cnt_restart;
mbedtls_ecp_group grp;
mbedtls_ecp_group_init( &grp );
mbedtls_ecdh_init( &srv ); mbedtls_ecdh_init( &srv );
mbedtls_ecdh_init( &cli ); mbedtls_ecdh_init( &cli );
@ -184,11 +190,15 @@ void ecdh_restart( int id, char *dA_str, char *dB_str, char *z_str,
rnd_info_B.buf = rnd_buf_B; rnd_info_B.buf = rnd_buf_B;
rnd_info_B.length = unhexify( rnd_buf_B, dB_str ); rnd_info_B.length = unhexify( rnd_buf_B, dB_str );
TEST_ASSERT( mbedtls_ecp_group_load( &srv.grp, id ) == 0 ); /* The ECDH context is not guaranteed ot have an mbedtls_ecp_group structure
* in every configuration, therefore we load it separately. */
TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );
/* otherwise we would have to fix the random buffer, /* Otherwise we would have to fix the random buffer,
* as in ecdh_primitive_test_vec */ * as in ecdh_primitive_testvec. */
TEST_ASSERT( srv.grp.nbits % 8 == 0 ); TEST_ASSERT( grp.nbits % 8 == 0 );
TEST_ASSERT( mbedtls_ecdh_setup( &srv, id ) == 0 );
/* set up restart parameters */ /* set up restart parameters */
mbedtls_ecp_set_max_ops( max_ops ); mbedtls_ecp_set_max_ops( max_ops );
@ -269,12 +279,13 @@ void ecdh_restart( int id, char *dA_str, char *dB_str, char *z_str,
TEST_ASSERT( memcmp( buf, z, len ) == 0 ); TEST_ASSERT( memcmp( buf, z, len ) == 0 );
exit: exit:
mbedtls_ecp_group_free( &grp );
mbedtls_ecdh_free( &srv ); mbedtls_ecdh_free( &srv );
mbedtls_ecdh_free( &cli ); mbedtls_ecdh_free( &cli );
} }
/* END_CASE */ /* END_CASE */
/* BEGIN_CASE */ /* BEGIN_CASE depends_on:MBEDTLS_ECDH_LEGACY_CONTEXT */
void ecdh_exchange_legacy( int id ) void ecdh_exchange_legacy( int id )
{ {
mbedtls_ecdh_context srv, cli; mbedtls_ecdh_context srv, cli;