From b05a2d4525bbf54f8b3506c934945e7ea9ae251a Mon Sep 17 00:00:00 2001
From: Augusto Zanellato <augusto.zanellato@gmail.com>
Date: Fri, 24 Feb 2023 00:55:49 +0100
Subject: [PATCH 1/2] Add mfc signature support to gen4 lua script

---
 client/luascripts/hf_mf_ultimatecard.lua | 34 ++++++++++++++++--------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/client/luascripts/hf_mf_ultimatecard.lua b/client/luascripts/hf_mf_ultimatecard.lua
index 42a5e1887..aca2cccb7 100644
--- a/client/luascripts/hf_mf_ultimatecard.lua
+++ b/client/luascripts/hf_mf_ultimatecard.lua
@@ -483,17 +483,29 @@ local function write_signature(data)
     end
     local info = connect()
     if not info then return false, "Can't select card" end
-    if ulprotocol == '00' then return nil, 'Magic Card is not using the Ultralight Protocol' end
-    print('Writing new signature',data)
-    local b,c
-    local cmd = 'A2F%d%s'
-    local j = 2
-    for i = 1, #data, 8 do
-        b = data:sub(i,i+7)
-        c = cmd:format(j,b)
-        local resp = send(c)
-        if resp ~= '0A' then lib14a.disconnect(); return nil, oops('Failed to write signature') end
-        j = j + 1
+    if ulprotocol == '00' then
+        print('Writing new MFC signature',data)
+        send('CF'.._key..'6B48')
+        lib14a.disconnect()
+        connect() -- not 100% sure why it's needed, but without this blocks aren't actually written
+        local sig1 = data:sub(1, 32)
+        local sig2 = data:sub(33, 64)
+
+        send('CF'.._key..'CD45'..sig1)
+        send('CF'.._key..'CD46'..sig2)
+        send('CF'.._key..'CD475C8FF9990DA270F0F8694B791BEA7BCC')
+    else
+        print('Writing new MFUL signature',data)
+        local b,c
+        local cmd = 'A2F%d%s'
+        local j = 2
+        for i = 1, #data, 8 do
+            b = data:sub(i,i+7)
+            c = cmd:format(j,b)
+            local resp = send(c)
+            if resp ~= '0A' then lib14a.disconnect(); return nil, oops('Failed to write signature') end
+            j = j + 1
+        end
     end
     lib14a.disconnect()
     return true, 'Ok'

From 7834db8be756bbbb944f45bc5e5632a3ecdd6cd5 Mon Sep 17 00:00:00 2001
From: Augusto Zanellato <augusto.zanellato@gmail.com>
Date: Fri, 24 Feb 2023 00:59:35 +0100
Subject: [PATCH 2/2] Add CHANGELOG.md entry, bump script version

---
 CHANGELOG.md                             | 1 +
 client/luascripts/hf_mf_ultimatecard.lua | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7321da285..c49a7c08e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac
  - Changed `hf iclass decrypt` - mark credentials as decrypted in the dump (@natesales)
  - Changed `hf iclass view` - show credentials on a decrypted dump (@natesales)
  - Show NTAG213TT tamper info in `hf mfu info` and add commands for configuring it's tamper feature (@mjaksn)
+ - Add Mifare Classic EV1 signature write support to gen4 magic tag lua script (@augustozanellato)
 
 ## [Nitride.4.16191][2023-01-29]
  - Changed `build_all_firmwares.sh` to fit GENERIC 256kb firmware images (@doegox)
diff --git a/client/luascripts/hf_mf_ultimatecard.lua b/client/luascripts/hf_mf_ultimatecard.lua
index aca2cccb7..93e64e333 100644
--- a/client/luascripts/hf_mf_ultimatecard.lua
+++ b/client/luascripts/hf_mf_ultimatecard.lua
@@ -13,7 +13,7 @@ local err_lock = 'use -k or change cfg0 block'
 local _print = 0
 copyright = ''
 author = 'Nathan Glaser'
-version = 'v1.0.4'
+version = 'v1.0.5'
 date = 'Created - Jan 2022'
 desc = 'This script enables easy programming of an Ultimate Mifare Magic card'
 example = [[