From 8eed86fba9d5dea89a0ead255b47842e9e1c5050 Mon Sep 17 00:00:00 2001
From: Jaka Hudoklin <jakahudoklin@gmail.com>
Date: Wed, 24 Sep 2014 11:20:47 +0200
Subject: [PATCH] add mfoc, Mifare Classic Offline Cracker

---
 pkgs/tools/security/mfoc/default.nix   | 23 ++++++
 pkgs/tools/security/mfoc/mf_mini.patch | 96 ++++++++++++++++++++++++++
 pkgs/top-level/all-packages.nix        |  2 +
 3 files changed, 121 insertions(+)
 create mode 100644 pkgs/tools/security/mfoc/default.nix
 create mode 100644 pkgs/tools/security/mfoc/mf_mini.patch

diff --git a/pkgs/tools/security/mfoc/default.nix b/pkgs/tools/security/mfoc/default.nix
new file mode 100644
index 000000000000..f99db572b6c3
--- /dev/null
+++ b/pkgs/tools/security/mfoc/default.nix
@@ -0,0 +1,23 @@
+{ stdenv, fetchurl, pkgconfig, libnfc }:
+
+stdenv.mkDerivation rec {
+  name = "mfoc-${version}";
+  version = "0.10.6";
+
+  src = fetchurl {
+    url = "http://mfoc.googlecode.com/files/${name}.tar.gz";
+    sha1 = "3adce3029dce9124ff3bc7d0fad86fa0c374a9e3";
+  };
+
+  patches = [./mf_mini.patch];
+
+  buildInputs = [ pkgconfig libnfc ];
+
+  meta = with stdenv.lib; {
+    description = "Mifare Classic Offline Cracker";
+    license = licenses.gpl2;
+    homepage = http://code.google.com/p/mfoc/;
+    maintainers = with maintainers; [ offline ];
+    platforms = with platforms; unix;
+  };
+}
diff --git a/pkgs/tools/security/mfoc/mf_mini.patch b/pkgs/tools/security/mfoc/mf_mini.patch
new file mode 100644
index 000000000000..02bd656d6025
--- /dev/null
+++ b/pkgs/tools/security/mfoc/mf_mini.patch
@@ -0,0 +1,96 @@
+diff --git a/src/mfoc.c b/src/mfoc.c
+index 0cb917d..195de68 100644
+--- a/src/mfoc.c
++++ b/src/mfoc.c
+@@ -93,8 +93,8 @@ int main(int argc, char *const argv[])
+     {0x58, 0x7e, 0xe5, 0xf9, 0x35, 0x0f},
+     {0xa0, 0x47, 0x8c, 0xc3, 0x90, 0x91},
+     {0x53, 0x3c, 0xb6, 0xc7, 0x23, 0xf6},
+-    {0x8f, 0xd0, 0xa4, 0xf2, 0x56, 0xe9}
+-
++    {0x8f, 0xd0, 0xa4, 0xf2, 0x56, 0xe9},
++    {0xb4, 0xc1, 0x32, 0x43, 0x9e, 0xef}
+   };
+ 
+   mftag		t;
+@@ -219,12 +219,31 @@ int main(int argc, char *const argv[])
+     goto error;
+   }
+ 
+-  // Save tag's block size (b4K)
+-  t.b4K = (t.nt.nti.nai.abtAtqa[1] == 0x02);
+   t.authuid = (uint32_t) bytes_to_num(t.nt.nti.nai.abtUid + t.nt.nti.nai.szUidLen - 4, 4);
+ 
+-  t.num_blocks = (t.b4K) ? 0xff : 0x3f;
+-  t.num_sectors = t.b4K ? NR_TRAILERS_4k : NR_TRAILERS_1k;
++  // Get Mifare Classic type from SAK
++  // see http://www.nxp.com/documents/application_note/AN10833.pdf Section 3.2
++  switch (t.nt.nti.nai.btSak)
++  {
++    case 0x08:
++      printf("Found Mifare Classic 1k tag\n");
++      t.num_sectors = NR_TRAILERS_1k;
++      t.num_blocks = NR_BLOCKS_1k;
++      break;
++    case 0x09:
++      printf("Found Mifare Classic Mini tag\n");
++      t.num_sectors = NR_TRAILERS_MINI;
++      t.num_blocks = NR_BLOCKS_MINI;
++      break;
++    case 0x18:
++      printf("Found Mifare Classic 4k tag\n");
++      t.num_sectors = NR_TRAILERS_4k;
++      t.num_blocks = NR_BLOCKS_4k;
++      break;
++    defaul:
++      ERR("Cannot determine card type from SAK");
++      goto error;
++  }
+ 
+   t.sectors = (void *) calloc(t.num_sectors, sizeof(sector));
+   if (t.sectors == NULL) {
+@@ -564,7 +583,7 @@ void usage(FILE *stream, int errno)
+   fprintf(stream, "  k     try the specified key in addition to the default keys\n");
+ //	fprintf(stream, "  D     number of distance probes, default is 20\n");
+ //	fprintf(stream, "  S     number of sets with keystreams, default is 5\n");
+-  fprintf(stream, "  P     number of probes per sector, instead of default of 20\n");
++  fprintf(stream, "  P     number of probes per sector, instead of default of 150\n");
+   fprintf(stream, "  T     nonce tolerance half-range, instead of default of 20\n        (i.e., 40 for the total range, in both directions)\n");
+ //	fprintf(stream, "  s     specify the list of sectors to crack, for example -s 0,1,3,5\n");
+   fprintf(stream, "  O     file in which the card contents will be written (REQUIRED)\n");
+diff --git a/src/mfoc.h b/src/mfoc.h
+index b411670..532e834 100644
+--- a/src/mfoc.h
++++ b/src/mfoc.h
+@@ -2,11 +2,21 @@
+ #define TRY_KEYS                50
+ 
+ // Number of trailers == number of sectors
+-// 16x64b = 16
++// Mifare Classic 1k 16x64b = 16
+ #define NR_TRAILERS_1k  (16)
+-// 32x64b + 8*256b = 40
++// Mifare Classic Mini
++#define NR_TRAILERS_MINI (5)
++// Mifare Classic 4k 32x64b + 8*256b = 40
+ #define NR_TRAILERS_4k  (40)
+ 
++// Number of blocks
++// Mifare Classic 1k
++#define NR_BLOCKS_1k 0x3f
++// Mifare Classic Mini
++#define NR_BLOCKS_MINI 0x13
++// Mifare Classic 4k
++#define NR_BLOCKS_4k 0xff
++
+ #define MAX_FRAME_LEN 264
+ 
+ // Used for counting nonce distances, explore [nd-value, nd+value]
+@@ -46,7 +56,6 @@ typedef struct {
+   uint8_t        num_sectors;
+   uint8_t        num_blocks;
+   uint32_t       authuid;
+-  bool           b4K;
+ } mftag;
+ 
+ typedef struct {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2e897430d2a2..8d6759d84592 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1607,6 +1607,8 @@ let
 
   mfcuk = callPackage ../tools/security/mfcuk { };
 
+  mfoc = callPackage ../tools/security/mfoc { };
+
   minecraft = callPackage ../games/minecraft { };
 
   minecraft-server = callPackage ../games/minecraft-server { };