Combine hex parameters in a struct
diff --git a/tests/suites/test_suite_arc4.function b/tests/suites/test_suite_arc4.function
index e3ff303..2a56a5b 100644
--- a/tests/suites/test_suite_arc4.function
+++ b/tests/suites/test_suite_arc4.function
@@ -8,10 +8,8 @@
  */
 
 /* BEGIN_CASE */
-void mbedtls_arc4_crypt( uint8_t * src_str, uint32_t src_len,
-                         uint8_t * key_str, uint32_t key_len,
-                         uint8_t * hex_dst_string, uint32_t hex_dst_string_len
-                         )
+void mbedtls_arc4_crypt( HexParam_t * src_str, HexParam_t * key_str,
+                         HexParam_t * hex_dst_string )
 {
     unsigned char dst_str[1000];
     mbedtls_arc4_context ctx;
@@ -20,10 +18,10 @@
     mbedtls_arc4_init( &ctx );
 
 
-    mbedtls_arc4_setup(&ctx, key_str, key_len);
-    TEST_ASSERT( mbedtls_arc4_crypt(&ctx, src_len, src_str, dst_str ) == 0 );
+    mbedtls_arc4_setup(&ctx, key_str->x, key_str->len);
+    TEST_ASSERT( mbedtls_arc4_crypt(&ctx, src_str->len, src_str->x, dst_str ) == 0 );
 
-    TEST_ASSERT( hexcmp( dst_str, hex_dst_string, src_len, hex_dst_string_len ) == 0 );
+    TEST_ASSERT( hexcmp( dst_str, hex_dst_string->x, src_str->len, hex_dst_string->len ) == 0 );
 
 exit:
     mbedtls_arc4_free( &ctx );