hf 14a info: add ATR fingerprinting

Author: doegox

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 ATR fingerprinting to `hf 14a info` (@doegox)
 
 ## [Phrack.4.20728][2025-09-11]
 - Change `lf t55xx restore` - now skips writing block0 if its all zeros (@iceman1001)

client/atr_scrap_pcsctools.py

@@ -48,13 +48,16 @@
 
 #define ATRS_H__
 #include <stddef.h>
+#include <stdint.h>
 
 typedef struct atr_s {
     const char *bytes;
     const char *desc;
 } atr_t;
 
 const char *getAtrInfo(const char *atr_str);
+void atsToEmulatedAtr(uint8_t *ats, uint8_t *atr, int *atrLen);
+void atqbToEmulatedAtr(uint8_t *atqb, uint8_t cid, uint8_t *atr, int *atrLen);
 
 // atr_t array is expected to be NULL terminated
 const static atr_t AtrTable[] = {

client/src/atrs.c

@@ -67,3 +67,62 @@ const char *getAtrInfo(const char *atr_str) {
         return AtrTable[ARRAYLEN(AtrTable) - 1].desc;
     }
 }
+
+void atsToEmulatedAtr(uint8_t *ats, uint8_t *atr, int *atrLen) {
+    uint8_t historicalLen = 0;
+    uint8_t offset = 2;
+
+    if (ats[0] < 2) {
+        historicalLen = 0;
+    } else {
+
+        if ((ats[1] & 64) != 0) {
+            offset++;
+        }
+        if ((ats[1] & 32) != 0) {
+            offset++;
+        }
+        if ((ats[1] & 16) != 0) {
+            offset++;
+        }
+
+        if (offset >= ats[0]) {
+            historicalLen = 0;
+        } else {
+            historicalLen = ats[0] - offset;
+        }
+    }
+
+    atr[0] = 0x3B;
+    atr[1] = 0x80 | historicalLen;
+    atr[2] = 0x80;
+    atr[3] = 0x01;
+
+    uint8_t tck = atr[1] ^ atr[2] ^ atr[3];
+    for (uint8_t i = 0; i < historicalLen; ++i) {
+        atr[4 + i] = ats[offset + i];
+        tck = tck ^ ats[offset + i];
+    }
+    atr[4 + historicalLen] = tck;
+
+    *atrLen = 5 + historicalLen;
+}
+
+void atqbToEmulatedAtr(uint8_t *atqb, uint8_t cid, uint8_t *atr, int *atrLen) {
+    atr[0] = 0x3B;
+    atr[1] = 0x80 | 8;
+    atr[2] = 0x80;
+    atr[3] = 0x01;
+
+    memcpy(atr + 4, atqb, 7);
+    atr[11] = cid >> 4;
+
+    uint8_t tck = 0;
+    for (int i = 1; i < 12; ++i) {
+        tck = tck ^ atr[i];
+    }
+    atr[12] = tck;
+
+    *atrLen = 13;
+}
+

client/src/atrs.h

@@ -23,13 +23,16 @@
 
 #define ATRS_H__
 #include <stddef.h>
+#include <stdint.h>
 
 typedef struct atr_s {
     const char *bytes;
     const char *desc;
 } atr_t;
 
 const char *getAtrInfo(const char *atr_str);
+void atsToEmulatedAtr(uint8_t *ats, uint8_t *atr, int *atrLen);
+void atqbToEmulatedAtr(uint8_t *atqb, uint8_t cid, uint8_t *atr, int *atrLen);
 
 // atr_t array is expected to be NULL terminated
 const static atr_t AtrTable[] = {

client/src/cmdhf14a.c

@@ -2946,7 +2946,7 @@ int infoHF14A(bool verbose, bool do_nack_test, bool do_aid_search) {
             if ((card.ats[0] > pos) && (card.ats_len >= card.ats[0] + 2)) {
                 uint8_t calen = card.ats[0] - pos;
                 PrintAndLogEx(NORMAL, "");
-                PrintAndLogEx(INFO, "-------------------- " _CYAN_("Historical bytes") " ----------------------------");
+                PrintAndLogEx(INFO, "-------------------- " _CYAN_("Historical bytes") " ---------------------------");
 
                 if (card.ats[pos] == 0xC1) {
                     PrintAndLogEx(INFO, "    %s", sprint_hex(card.ats + pos, calen));
@@ -3024,6 +3024,18 @@ int infoHF14A(bool verbose, bool do_nack_test, bool do_aid_search) {
                                       , sprint_ascii(card.ats + pos, calen)
                                      );
                     }
+                    PrintAndLogEx(NORMAL, "");
+                    PrintAndLogEx(INFO, "------------------ " _CYAN_("ATR fingerprinting") " ---------------------------");
+                    uint8_t atr[256] = {0};
+                    int atrLen = 0;
+                    atsToEmulatedAtr(card.ats, atr, &atrLen);
+                    char *copy = str_dup(getAtrInfo(sprint_hex_inrow(atr, atrLen)));
+                    char *token = strtok(copy, "\n");
+                    while (token != NULL) {
+                        PrintAndLogEx(INFO, "    %s", token);
+                        token = strtok(NULL, "\n");
+                    }
+                    free(copy);
                 }
             }
         }

client/src/cmdsmartcard.c

@@ -1212,64 +1212,6 @@ static int CmdSmartBruteforceSFI(const char *Cmd) {
     return PM3_SUCCESS;
 }
 
-static void atsToEmulatedAtr(uint8_t *ats, uint8_t *atr, int *atrLen) {
-    uint8_t historicalLen = 0;
-    uint8_t offset = 2;
-
-    if (ats[0] < 2) {
-        historicalLen = 0;
-    } else {
-
-        if ((ats[1] & 64) != 0) {
-            offset++;
-        }
-        if ((ats[1] & 32) != 0) {
-            offset++;
-        }
-        if ((ats[1] & 16) != 0) {
-            offset++;
-        }
-
-        if (offset >= ats[0]) {
-            historicalLen = 0;
-        } else {
-            historicalLen = ats[0] - offset;
-        }
-    }
-
-    atr[0] = 0x3B;
-    atr[1] = 0x80 | historicalLen;
-    atr[2] = 0x80;
-    atr[3] = 0x01;
-
-    uint8_t tck = atr[1] ^ atr[2] ^ atr[3];
-    for (uint8_t i = 0; i < historicalLen; ++i) {
-        atr[4 + i] = ats[offset + i];
-        tck = tck ^ ats[offset + i];
-    }
-    atr[4 + historicalLen] = tck;
-
-    *atrLen = 5 + historicalLen;
-}
-
-static void atqbToEmulatedAtr(uint8_t *atqb, uint8_t cid, uint8_t *atr, int *atrLen) {
-    atr[0] = 0x3B;
-    atr[1] = 0x80 | 8;
-    atr[2] = 0x80;
-    atr[3] = 0x01;
-
-    memcpy(atr + 4, atqb, 7);
-    atr[11] = cid >> 4;
-
-    uint8_t tck = 0;
-    for (int i = 1; i < 12; ++i) {
-        tck = tck ^ atr[i];
-    }
-    atr[12] = tck;
-
-    *atrLen = 13;
-}
-
 static int CmdPCSC(const char *Cmd) {
     CLIParserContext *ctx;
     CLIParserInit(&ctx, "smart pcsc",