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Fix failing ECDH test (test vectors misuse)

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This commit is contained in:
Manuel Pégourié-Gonnard 2014-01-23 16:55:18 +01:00
parent 9f3c7d7278
commit 544416aa99
1 changed files with 39 additions and 2 deletions
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41
tests/suites/test_suite_ecdh.function
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@ -50,6 +50,9 @@ void ecdh_primitive_testvec( int id, char *dA_str, char *xA_str, char *yA_str,
ecp_group grp;
ecp_point qA, qB;
mpi dA, dB, zA, zB, check;
unsigned char rnd_buf_A[POLARSSL_ECP_MAX_BYTES];
unsigned char rnd_buf_B[POLARSSL_ECP_MAX_BYTES];
rnd_buf_info rnd_info_A, rnd_info_B;
ecp_group_init( &grp );
ecp_point_init( &qA ); ecp_point_init( &qB );
@ -58,14 +61,48 @@ void ecdh_primitive_testvec( int id, char *dA_str, char *xA_str, char *yA_str,
TEST_ASSERT( ecp_use_known_dp( &grp, id ) == 0 );
TEST_ASSERT( ecdh_gen_public( &grp, &dA, &qA, &not_rnd_mpi, dA_str ) == 0 );
rnd_info_A.buf = rnd_buf_A;
rnd_info_A.length = unhexify( rnd_buf_A, dA_str );
/* Fix rnd_buf_A by shifting it left if necessary */
if( grp.nbits % 8 != 0 )
{
unsigned char shift = 8 - ( grp.nbits % 8 );
size_t i;
for( i = 0; i < rnd_info_A.length - 1; i++ )
rnd_buf_A[i] = rnd_buf_A[i] << shift
| rnd_buf_A[i+1] >> ( 8 - shift );
rnd_buf_A[rnd_info_A.length-1] <<= shift;
}
rnd_info_B.buf = rnd_buf_B;
rnd_info_B.length = unhexify( rnd_buf_B, dB_str );
/* Fix rnd_buf_B by shifting it left if necessary */
if( grp.nbits % 8 != 0 )
{
unsigned char shift = 8 - ( grp.nbits % 8 );
size_t i;
for( i = 0; i < rnd_info_B.length - 1; i++ )
rnd_buf_B[i] = rnd_buf_B[i] << shift
| rnd_buf_B[i+1] >> ( 8 - shift );
rnd_buf_B[rnd_info_B.length-1] <<= shift;
}
TEST_ASSERT( ecdh_gen_public( &grp, &dA, &qA,
rnd_buffer_rand, &rnd_info_A ) == 0 );
TEST_ASSERT( ! ecp_is_zero( &qA ) );
TEST_ASSERT( mpi_read_string( &check, 16, xA_str ) == 0 );
TEST_ASSERT( mpi_cmp_mpi( &qA.X, &check ) == 0 );
TEST_ASSERT( mpi_read_string( &check, 16, yA_str ) == 0 );
TEST_ASSERT( mpi_cmp_mpi( &qA.Y, &check ) == 0 );
TEST_ASSERT( ecdh_gen_public( &grp, &dB, &qB, &not_rnd_mpi, dB_str ) == 0 );
TEST_ASSERT( ecdh_gen_public( &grp, &dB, &qB,
rnd_buffer_rand, &rnd_info_B ) == 0 );
TEST_ASSERT( ! ecp_is_zero( &qB ) );
TEST_ASSERT( mpi_read_string( &check, 16, xB_str ) == 0 );
TEST_ASSERT( mpi_cmp_mpi( &qB.X, &check ) == 0 );