diff --git a/tests/suites/test_suite_pk.data b/tests/suites/test_suite_pk.data
index e8cc076..3dc2b8b 100644
--- a/tests/suites/test_suite_pk.data
+++ b/tests/suites/test_suite_pk.data
@@ -1,3 +1,6 @@
+PK invalid parameters
+pk_invalid_param:
+
 PK valid parameters
 valid_parameters:
 
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 9c04560..7fc6873 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -299,6 +299,39 @@
 }
 /* END_CASE */
 
+
+/* BEGIN_CASE */
+void pk_invalid_param()
+{
+    mbedtls_pk_context ctx;
+    mbedtls_md_type_t md_alg_none = MBEDTLS_MD_NONE;
+    mbedtls_pk_type_t pk_type = 0;
+    unsigned char buf[] = {0x01,0x02,0x03,0x04,0x05,0x06};
+    size_t buf_size = sizeof( buf );
+
+    mbedtls_pk_init( &ctx );
+
+    TEST_EQUAL( MBEDTLS_ERR_PK_BAD_INPUT_DATA,
+                mbedtls_pk_verify_restartable( &ctx, md_alg_none,
+                                               NULL, buf_size,
+                                               buf, buf_size,
+                                               NULL ) );
+    TEST_EQUAL( MBEDTLS_ERR_PK_BAD_INPUT_DATA,
+                mbedtls_pk_verify_ext( pk_type, NULL,
+                                       &ctx, md_alg_none,
+                                       NULL, buf_size,
+                                       buf, buf_size ) );
+    TEST_EQUAL( MBEDTLS_ERR_PK_BAD_INPUT_DATA,
+                mbedtls_pk_sign_restartable( &ctx, md_alg_none,
+                                             NULL, buf_size,
+                                             buf, buf_size, &buf_size,
+                                             NULL, NULL,
+                                             NULL ) );
+exit:
+    mbedtls_pk_free( &ctx );
+}
+/* END_CASE */
+
 /* BEGIN_CASE */
 void valid_parameters( )
 {