Add unit tests for ECDSA with invalid public key
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>
diff --git a/tests/suites/test_suite_ecdsa.function b/tests/suites/test_suite_ecdsa.function
index a8b1e45..947890a 100644
--- a/tests/suites/test_suite_ecdsa.function
+++ b/tests/suites/test_suite_ecdsa.function
@@ -466,3 +466,68 @@
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 */
\ No newline at end of file