Add ecdsa_{read,write}_signature()
diff --git a/tests/suites/test_suite_ecdsa.function b/tests/suites/test_suite_ecdsa.function
index 5e1ba64..46dd1b3 100644
--- a/tests/suites/test_suite_ecdsa.function
+++ b/tests/suites/test_suite_ecdsa.function
@@ -76,3 +76,63 @@
mpi_free( &r_check ); mpi_free( &s_check );
}
/* END_CASE */
+
+/* BEGIN_CASE */
+void ecdsa_write_read_random( int id )
+{
+ ecdsa_context ctx;
+ rnd_pseudo_info rnd_info;
+ unsigned char hash[66];
+ unsigned char sig[200];
+ size_t sig_len, i;
+
+ ecdsa_init( &ctx );
+ memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
+ memset( hash, 0, sizeof( hash ) );
+ memset( sig, 0x2a, sizeof( sig ) );
+
+ /* prepare material for signature */
+ TEST_ASSERT( rnd_pseudo_rand( &rnd_info, hash, sizeof( hash ) ) == 0 );
+
+ /* generate signing key */
+ TEST_ASSERT( ecp_use_known_dp( &ctx.grp, id ) == 0 );
+ TEST_ASSERT( ecp_gen_keypair( &ctx.grp, &ctx.d, &ctx.Q,
+ &rnd_pseudo_rand, &rnd_info ) == 0 );
+
+ /* generate and write signature, then read and verify it */
+ TEST_ASSERT( ecdsa_write_signature( &ctx, hash, sizeof( hash ),
+ sig, &sig_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
+ TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
+ sig, sig_len ) == 0 );
+
+ /* check we didn't write past the announced length */
+ for( i = sig_len; i < sizeof( sig ); i++ )
+ TEST_ASSERT( sig[i] == 0x2a );
+
+ /* try verification with invalid length */
+ TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
+ sig, sig_len - 1 ) != 0 );
+ TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
+ sig, sig_len + 1 ) != 0 );
+
+ /* try invalid sequence tag */
+ sig[0]++;
+ TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
+ sig, sig_len ) != 0 );
+ sig[0]--;
+
+ /* try modifying r */
+ sig[10]++;
+ TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
+ sig, sig_len ) != 0 );
+ sig[10]--;
+
+ /* try modifying s */
+ sig[sig_len - 1]++;
+ TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
+ sig, sig_len ) != 0 );
+ sig[sig_len - 1]--;
+
+ ecdsa_free( &ctx );
+}
+/* END_CASE */