Reduce size of buffers in test suites
diff --git a/tests/suites/test_suite_chachapoly.function b/tests/suites/test_suite_chachapoly.function
index b205c4c..3d6a2b6 100644
--- a/tests/suites/test_suite_chachapoly.function
+++ b/tests/suites/test_suite_chachapoly.function
@@ -10,14 +10,14 @@
 /* BEGIN_CASE */
 void mbedtls_chachapoly_enc( char *hex_key_string, char *hex_nonce_string, char *hex_aad_string, char *hex_input_string, char *hex_output_string, char *hex_mac_string )
 {
-    unsigned char key_str[32];
-    unsigned char nonce_str[12];
-    unsigned char aad_str[10000];
-    unsigned char input_str[10000];
-    unsigned char output_str[10000];
-    unsigned char mac_str[16];
-    unsigned char output[10000];
-    unsigned char mac[16];
+    unsigned char key_str[32]; /* size set by the standard */
+    unsigned char nonce_str[12]; /* size set by the standard */
+    unsigned char aad_str[12]; /* max size of test data so far */
+    unsigned char input_str[265]; /* max size of binary input/output so far */
+    unsigned char output_str[265];
+    unsigned char output[265];
+    unsigned char mac_str[16]; /* size set by the standard */
+    unsigned char mac[16]; /* size set by the standard */
     size_t input_len;
     size_t output_len;
     size_t aad_len;
@@ -26,12 +26,12 @@
     size_t mac_len;
     mbedtls_chachapoly_context ctx;
 
-    memset( key_str,     0x00, 32    );
-    memset( nonce_str,   0x00, 12    );
-    memset( aad_str,     0x00, 10000 );
-    memset( input_str,   0x00, 10000 );
-    memset( output_str,  0x00, 10000 );
-    memset( mac_str,     0x00, 16    );
+    memset( key_str,    0x00, sizeof( key_str ) );
+    memset( nonce_str,  0x00, sizeof( nonce_str ) );
+    memset( aad_str,    0x00, sizeof( aad_str ) );
+    memset( input_str,  0x00, sizeof( input_str ) );
+    memset( output_str, 0x00, sizeof( output_str ) );
+    memset( mac_str,    0x00, sizeof( mac_str ) );
 
     aad_len    = unhexify( aad_str,    hex_aad_string    );
     input_len  = unhexify( input_str,  hex_input_string  );
@@ -65,13 +65,13 @@
 /* BEGIN_CASE */
 void mbedtls_chachapoly_dec( char *hex_key_string, char *hex_nonce_string, char *hex_aad_string, char *hex_input_string, char *hex_output_string, char *hex_mac_string )
 {
-    unsigned char key_str[32];
-    unsigned char nonce_str[12];
-    unsigned char aad_str[10000];
-    unsigned char input_str[10000];
-    unsigned char output_str[10000];
-    unsigned char mac_str[16];
-    unsigned char output[10000];
+    unsigned char key_str[32]; /* size set by the standard */
+    unsigned char nonce_str[12]; /* size set by the standard */
+    unsigned char aad_str[12]; /* max size of test data so far */
+    unsigned char input_str[265]; /* max size of binary input/output so far */
+    unsigned char output_str[265];
+    unsigned char output[265];
+    unsigned char mac_str[16]; /* size set by the standard */
     size_t input_len;
     size_t output_len;
     size_t aad_len;
@@ -81,12 +81,12 @@
     int ret;
     mbedtls_chachapoly_context ctx;
 
-    memset( key_str,     0x00, 32    );
-    memset( nonce_str,   0x00, 12    );
-    memset( aad_str,     0x00, 10000 );
-    memset( input_str,   0x00, 10000 );
-    memset( output_str,  0x00, 10000 );
-    memset( mac_str,     0x00, 16    );
+    memset( key_str,    0x00, sizeof( key_str ) );
+    memset( nonce_str,  0x00, sizeof( nonce_str ) );
+    memset( aad_str,    0x00, sizeof( aad_str ) );
+    memset( input_str,  0x00, sizeof( input_str ) );
+    memset( output_str, 0x00, sizeof( output_str ) );
+    memset( mac_str,    0x00, sizeof( mac_str ) );
 
     aad_len    = unhexify( aad_str,    hex_aad_string    );
     input_len  = unhexify( input_str,  hex_input_string  );