Add PK test for forbidden operations
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 157860c..6eaecfb 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -250,3 +250,33 @@
     pk_free( &pk );
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void pk_ec_nocrypt( int type )
+{
+    pk_context pk;
+    unsigned char output[100];
+    unsigned char input[100];
+    rnd_pseudo_info rnd_info;
+    size_t olen = 0;
+    int ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
+
+    pk_init( &pk );
+
+    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
+    memset( output,     0, sizeof( output ) );
+    memset( input,      0, sizeof( input ) );
+
+    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( type ) ) == 0 );
+
+    TEST_ASSERT( pk_encrypt( &pk, input, sizeof( input ),
+                             output, &olen, sizeof( output ),
+                             rnd_pseudo_rand, &rnd_info ) == ret );
+
+    TEST_ASSERT( pk_decrypt( &pk, input, sizeof( input ),
+                             output, &olen, sizeof( output ),
+                             rnd_pseudo_rand, &rnd_info ) == ret );
+
+    pk_free( &pk );
+}
+/* END_CASE */