Fix broken older functionality

Updated to still maintain older functionality when the macs field is passed

CHANGELOG.md

@@ -3,7 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
-- Changed `hf iclass wrbl` - replay behavior to use privilege escalation instead of having to generate specific block/content macs(@antiklesys)
+- Changed `hf iclass wrbl` - replay behavior to use privilege escalation if the macs field is not passed empty(@antiklesys)
 - Changed `hf iclass restore` - it now supports privilege escalation to restore card content using replay (@antiklesys)
 - Fixed `hf 15 dump` - now reads sysinfo response correct (@iceman1001)
 - Changed `make clean` - it now removes all __pycache__ folders (@iceman1001)

armsrc/iclass.c

@@ -1938,6 +1938,9 @@ void iClass_WriteBlock(uint8_t *msg) {
         write_len -= 2;
     } else {
 
+        if (payload->req.use_replay && sizeof(payload->mac) > 0) {
+            memcpy(write + 10, payload->mac, sizeof(payload->mac));
+        } else {
         // Secure tags uses MAC
         uint8_t wb[9];
         wb[0] = payload->req.blockno;
@@ -1954,8 +1957,9 @@ void iClass_WriteBlock(uint8_t *msg) {
         }else{
             doMAC_N(wb, sizeof(wb), hdr.key_d, mac);
         }
-        memcpy(write + 10, mac, sizeof(mac));
 
+        memcpy(write + 10, mac, sizeof(mac));
+        }
     }
 
     start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

client/src/cmdhficlass.c

@@ -2329,7 +2329,7 @@ static int CmdHFiClass_WriteBlock(const char *Cmd) {
         arg_lit0(NULL, "credit", "key is assumed to be the credit key"),
         arg_lit0(NULL, "elite", "elite computations applied to key"),
         arg_lit0(NULL, "raw", "no computations applied to key"),
-        arg_lit0(NULL, "nr", "replay of NR/MAC using privilege escalation"),
+        arg_lit0(NULL, "nr", "replay of NR/MAC block write or use privilege escalation if mac is empty"),
         arg_lit0("v", "verbose", "verbose output"),
         arg_lit0(NULL, "shallow", "use shallow (ASK) reader modulation instead of OOK"),
         arg_param_end