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Add unit tests for ECDSA with invalid public key

Browse Source 
Add tests for a case in ECDSA signing where an invalid public
key is accepted in signature verification.

Test data taken from the OSS-fuzz issue, and additional
generated with python-ecdsa.

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2022-08-10 11:32:07 +01:00
parent 7c7a3eaab5
commit 535dccebdc
2 changed files with 125 additions and 0 deletions
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65
tests/suites/test_suite_ecdsa.function
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@@ -675,3 +675,68 @@ exit:
mbedtls_ecdsa_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void ecdsa_verify( int grp_id, char * x, char * y, char * r, char * s, int len, int key_is_valid, int expected )
{
uint8_t FUZZ_DATA[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 32, 136, 251, 46, 240, 45, 45, 27, 62, 60, 0, 0, 0, 32, 32, 32, 32, 124, 102, 235, 242, 220, 21, 68, 255, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 121, 1, 0, 0, 0, 91, 1, 0, 0, 0, 151, 1, 0, 0, 0, 32, 32, 255, 32, 32, 150, 14, 240, 249, 163, 174, 190, 100, 0, 0, 0, 0, 32, 32, 32, 32, 51, 48, 79, 125, 229, 21, 223, 118, 32, 32, 32, 32, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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mbedtls_ecdsa_context ctx;
mbedtls_mpi sig_r, sig_s;
const mbedtls_ecp_curve_info *curve_info;
mbedtls_ecdsa_init( &ctx );
mbedtls_mpi_init( &sig_r );
mbedtls_mpi_init( &sig_s );
/* Prepare ECP group context */
curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id );
TEST_ASSERT( curve_info != NULL );
TEST_EQUAL( mbedtls_ecp_group_load( &ctx.grp, curve_info->grp_id ), 0 );
/* Prepare public key */
TEST_EQUAL( mbedtls_mpi_read_string( &ctx.Q.X, 16, x ), 0 );
TEST_EQUAL( mbedtls_mpi_read_string( &ctx.Q.Y, 16, y ), 0 );
TEST_EQUAL( mbedtls_mpi_lset( &ctx.Q.Z, 1 ), 0 );
/* Prepare signature R & S */
TEST_EQUAL( mbedtls_mpi_read_string( &sig_r, 16, r ), 0 );
TEST_EQUAL( mbedtls_mpi_read_string( &sig_s, 16, s ), 0 );
/* Test whether public key has expected validity */
TEST_EQUAL( mbedtls_ecp_check_pubkey( &ctx.grp, &ctx.Q ), key_is_valid ? 0 : MBEDTLS_ERR_ECP_INVALID_KEY );
/* Verification */
int result = mbedtls_ecdsa_verify( &ctx.grp, FUZZ_DATA, ( size_t ) len, &ctx.Q, &sig_r, &sig_s );
TEST_EQUAL( result, expected );
if ( !key_is_valid ) {
/* Invalid public key must always fail */
TEST_ASSERT( result != 0 );
}
exit:
mbedtls_ecdsa_free( &ctx );
mbedtls_mpi_free( &sig_r );
mbedtls_mpi_free( &sig_s );
}
/* END_CASE */