Start adding internal module block_cipher.c

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/tests/suites/test_suite_block_cipher.data b/tests/suites/test_suite_block_cipher.data
new file mode 100644
index 0000000..f0529a9
--- /dev/null
+++ b/tests/suites/test_suite_block_cipher.data
@@ -0,0 +1,2 @@
+Invalid input
+invalid: