From 4b55047c5ba5a1645ecdaf824b22cc1acf8a68eb Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Mon, 18 Jul 2022 09:47:15 +0300
Subject: [PATCH 1/4] add mmbit

---
 client/src/cmdhftexkom.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/client/src/cmdhftexkom.c b/client/src/cmdhftexkom.c
index 18a1f5c48..41a0ecf52 100644
--- a/client/src/cmdhftexkom.c
+++ b/client/src/cmdhftexkom.c
@@ -191,6 +191,13 @@ static uint8_t TexcomTK13CRC(const uint8_t *data) {
     return crc;
 }
 
+static uint8_t MMBITCRC(const uint8_t *data) {
+    return
+        (data[0] & 0x0f) ^ ((data[0] >> 4) & 0x0f) ^
+        (data[1] & 0x0f) ^ ((data[1] >> 4) & 0x0f) ^
+        (data[2] & 0x0f) ^ ((data[2] >> 4) & 0x0f);
+}
+
 static unsigned char dallas_crc8(const unsigned char *data, const unsigned int size) {
     unsigned char crc = 0;
     for (unsigned int i = 0; i < size; ++i) {
@@ -539,6 +546,13 @@ int read_texkom_uid(bool loop, bool verbose) {
                 if (verbose) {
                     PrintAndLogEx(INFO, "CRC...... %s", (crc) ?  _GREEN_("ok") : _RED_("fail"));
                 }
+            } else if (card.tcode[2] == 0xFF && card.tcode[3] == 0xFF) {
+                PrintAndLogEx(INFO, "TYPE..... MMBIT");
+                PrintAndLogEx(INFO, "UID...... " _GREEN_("%s"), sprint_hex(&card.tcode[4], 3));
+                crc = (MMBITCRC(&card.tcode[4]) == card.tcode[7] >> 4);
+                if (verbose) {
+                    PrintAndLogEx(INFO, "CRC...... %s", (crc) ?  _GREEN_("ok") : _RED_("fail"));
+                }
             }
             if (verbose) {
                 PrintAndLogEx(INFO, "Raw... %s", sprint_hex(card.tcode, 8));

From 29086a42ab9f6b60b5cc3d92a5d3c5401b5e56c5 Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Mon, 18 Jul 2022 09:59:13 +0300
Subject: [PATCH 2/4] add check in the read command

---
 client/src/cmdhftexkom.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/client/src/cmdhftexkom.c b/client/src/cmdhftexkom.c
index 41a0ecf52..07ca40d29 100644
--- a/client/src/cmdhftexkom.c
+++ b/client/src/cmdhftexkom.c
@@ -721,6 +721,18 @@ static int CmdHFTexkomReader(const char *Cmd) {
                 else
                     PrintAndLogEx(WARNING, "crc       : WRONG");
 
+            } else if (tcode[2] == 0xFF && tcode[3] == 0xFF) {
+                // MMBIT
+                if (codefound != TexkomModTK13) {
+                    PrintAndLogEx(WARNING, "  mod type: WRONG");
+                }
+                PrintAndLogEx(INFO, "type      : MMBIT");
+                PrintAndLogEx(INFO, "uid       : %s", sprint_hex(&tcode[4], 3));
+
+                if (MMBITCRC(&tcode[4]) == tcode[7] >> 4)
+                    PrintAndLogEx(INFO, "crc       : OK");
+                else
+                    PrintAndLogEx(WARNING, "crc       : WRONG");
             } else if (tcode[2] == 0xCA) {
                 // TK17
                 if (codefound != TexkomModTK17) {

From 075c53096240e056df62c8f457930799e5ad242b Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Mon, 18 Jul 2022 10:11:13 +0300
Subject: [PATCH 3/4] fix crc

---
 client/src/cmdhftexkom.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/client/src/cmdhftexkom.c b/client/src/cmdhftexkom.c
index 07ca40d29..b62460e6c 100644
--- a/client/src/cmdhftexkom.c
+++ b/client/src/cmdhftexkom.c
@@ -193,9 +193,11 @@ static uint8_t TexcomTK13CRC(const uint8_t *data) {
 
 static uint8_t MMBITCRC(const uint8_t *data) {
     return
-        (data[0] & 0x0f) ^ ((data[0] >> 4) & 0x0f) ^
-        (data[1] & 0x0f) ^ ((data[1] >> 4) & 0x0f) ^
-        (data[2] & 0x0f) ^ ((data[2] >> 4) & 0x0f);
+        (( (data[0] & 0x0f) ^ ((data[0] >> 4) & 0x0f) ^
+           (data[1] & 0x0f) ^ ((data[1] >> 4) & 0x0f) ^
+           (data[2] & 0x0f) ^ ((data[2] >> 4) & 0x0f)
+         ) ^ 0x0f
+        ) & 0x0f;
 }
 
 static unsigned char dallas_crc8(const unsigned char *data, const unsigned int size) {

From d153c6c9776633d6532253fc643b1d0b8d33f3bd Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Mon, 18 Jul 2022 10:17:44 +0300
Subject: [PATCH 4/4] add changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bc8e9ece..bd3d91adf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +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]
+ - Added mmbit-002 (kibi-002, kb5004xk1) russian tag to `hf texkom read` command (@merlokk)
  - Added `hf sniff --smode` skip/group adc data to consume less memory. Now it can sniff very long signals (@merlokk)
  - Added `hf fudan` skeleton commands (@iceman1001)
  - Added `--reboot-to-bootloader` arg to pm3