cipher: add chachapoly test vector + unauth case
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index 92462e5..e4b7e43 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -560,14 +560,14 @@
     int ret;
     unsigned char key[50];
     unsigned char iv[50];
-    unsigned char cipher[200];
-    unsigned char clear[200];
+    unsigned char cipher[265]; /* max size of test data so far */
+    unsigned char clear[265];
+    unsigned char output[267]; /* above + 2 (overwrite check) */
     unsigned char ad[200];
     unsigned char tag[20];
     unsigned char my_tag[20];
     size_t key_len, iv_len, cipher_len, clear_len, ad_len, tag_len;
     mbedtls_cipher_context_t ctx;
-    unsigned char output[200];
     size_t outlen;
 
     mbedtls_cipher_init( &ctx );