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Expand negative coverage of ECDSA verification

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Motivated by CVE-2022-21449, to which we're not vulnerable, but we
didn't have a test for it. Now we do.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2022-04-20 10:34:22 +02:00
parent 35de7b013a
commit bcaba030ec
1 changed files with 63 additions and 11 deletions
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74
tests/suites/test_suite_ecdsa.function
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@ -314,20 +314,72 @@ void ecdsa_prim_test_vectors( int id, char * d_str, char * xQ_str,
if ( result == 0)
{
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &r, &r_check ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &s, &s_check ) == 0 );
/* save correct values; we'll generate incorrect ones below */
TEST_EQUAL( mbedtls_mpi_cmp_mpi( &r, &r_check ), 0 );
TEST_EQUAL( mbedtls_mpi_cmp_mpi( &s, &s_check ), 0 );
TEST_ASSERT( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q, &r_check, &s_check ) == 0 );
/* Valid signature */
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len,
&Q, &r_check, &s_check ), 0 );
TEST_ASSERT( mbedtls_mpi_sub_int( &r, &r, 1 ) == 0 );
TEST_ASSERT( mbedtls_mpi_add_int( &s, &s, 1 ) == 0 );
/* Invalid signature: wrong public key (G instead of Q) */
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len,
&grp.G, &r_check, &s_check ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_ASSERT( mbedtls_ecdsa_verify( &grp, hash->x, hash->len,
&Q, &r, &s_check ) == MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_ASSERT( mbedtls_ecdsa_verify( &grp, hash->x, hash->len,
&Q, &r_check, &s ) == MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_ASSERT( mbedtls_ecdsa_verify( &grp, hash->x, hash->len,
&grp.G, &r_check, &s_check ) == MBEDTLS_ERR_ECP_VERIFY_FAILED );
/* Invalid signatures: r or s or both one off */
TEST_EQUAL( mbedtls_mpi_sub_int( &r, &r, 1 ), 0 );
TEST_EQUAL( mbedtls_mpi_add_int( &s, &s, 1 ), 0 );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s_check ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r_check, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
/* Invalid signatures: r, s or both (CVE-2022-21449) are zero */
TEST_EQUAL( mbedtls_mpi_lset( &r, 0 ), 0 );
TEST_EQUAL( mbedtls_mpi_lset( &s, 0 ), 0 );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s_check ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r_check, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
/* Invalid signatures: r, s or both are negative */
TEST_EQUAL( mbedtls_mpi_lset( &r, -1 ), 0 );
TEST_EQUAL( mbedtls_mpi_lset( &s, -1 ), 0 );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s_check ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r_check, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
/* Invalid signatures: r, s or both are == N */
TEST_EQUAL( mbedtls_mpi_copy( &r, &grp.N ), 0 );
TEST_EQUAL( mbedtls_mpi_copy( &s, &grp.N ), 0 );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s_check ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r_check, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
/* Invalid signatures: r or s or both are > N */
TEST_EQUAL( mbedtls_mpi_add_int( &r, &grp.N, 1 ), 0 );
TEST_EQUAL( mbedtls_mpi_add_int( &s, &grp.N, 1 ), 0 );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s_check ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r_check, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_EQUAL( mbedtls_ecdsa_verify( &grp, hash->x, hash->len, &Q,
&r, &s ), MBEDTLS_ERR_ECP_VERIFY_FAILED );
}
exit: