crewID/libfreefare
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

New API function: mifare_classic_format_sector().

Browse source
This commit is contained in:
Romain Tartiere 2009-12-19 02:01:04 +00:00
parent ba8c9b5126
commit 1f40cc97c7
2 changed files with 52 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

53
mifare_classic.c
View file

@ -44,6 +44,8 @@ struct mifare_classic_tag {
nfc_iso14443a_info_t info;
int active;
MifareClassicKeyType last_authentication_key_type;
/*
* The following block numbers are on 2 bytes in order to use invalid
* address and avoid false cache hit with inconsistent data.
@ -85,7 +87,7 @@ unsigned char mifare_data_access_permissions[] = {
* |,---- C2 |||| ||,---------------------- d
* ||,--- C1 |||| |||,--------------------- i
* ||| |||| ||||
* 0b000 0b 1111 1111 */ 0xff,
* 0b000 0b 1111 1111 */ 0xff, /* Default (blank card) */
/* 0b001 0b 1000 1100 */ 0x8c,
/* 0b010 0b 1000 1000 */ 0x88,
/* 0b011 0b 1010 1111 */ 0xaf,
@ -118,7 +120,7 @@ uint16_t mifare_trailer_access_permissions[] = {
/* 0b001 0b 0001 1100 0000*/ 0x1c0,
/* 0b010 0b 0000 1000 1000*/ 0x088,
/* 0b011 0b 0000 1100 0000*/ 0x0c0,
/* 0b100 0b 0010 1010 1010*/ 0x2aa,
/* 0b100 0b 0010 1010 1010*/ 0x2aa, /* Default (blank card) */
/* 0b101 0b 0000 1101 0000*/ 0x0d0,
/* 0b110 0b 0001 1101 0001*/ 0x1d1,
/* 0b111 0b 0000 1100 0000*/ 0x0c0
@ -296,6 +298,7 @@ mifare_classic_authenticate (MifareClassicTag tag, MifareClassicBlockNumber bloc
tag->cached_access_bits.sector_trailer_block_number = -1;
tag->cached_access_bits.sector_access_bits = 0x00;
tag->last_authentication_key_type = key_type;
// No result. The MIFARE tag just ACKed.
return 0;
@ -628,3 +631,49 @@ mifare_classic_get_data_block_permission (MifareClassicTag tag, MifareClassicBlo
return -1;
}
}
/*
* Miscellaneous functions
*/
/*
* Reset a MIFARE target sector to factory default.
*/
int
mifare_classic_format_sector (MifareClassicTag tag, MifareClassicBlockNumber block)
{
MifareClassicBlockNumber first_sector_block = (block / 4) * 4;
/*
* Check that the current key allow us to rewrite data and trailer blocks.
*/
if ((mifare_classic_get_data_block_permission(tag, first_sector_block, MCAB_W, tag->last_authentication_key_type) != 1) ||
(mifare_classic_get_data_block_permission(tag, first_sector_block + 1, MCAB_W, tag->last_authentication_key_type) != 1) ||
(mifare_classic_get_data_block_permission(tag, first_sector_block + 2, MCAB_W, tag->last_authentication_key_type) != 1) ||
(mifare_classic_get_trailer_block_permission(tag, first_sector_block + 3, MCAB_WRITE_KEYA, tag->last_authentication_key_type) != 1) ||
(mifare_classic_get_trailer_block_permission(tag, first_sector_block + 3, MCAB_WRITE_ACCESS_BITS, tag->last_authentication_key_type) != 1) ||
(mifare_classic_get_trailer_block_permission(tag, first_sector_block + 3, MCAB_WRITE_KEYB, tag->last_authentication_key_type) != 1)) {
errno = EPERM;
return -1;
}
MifareClassicBlock empty_data_block;
memset (empty_data_block, '\x00', sizeof (empty_data_block));
MifareClassicBlock default_trailer_block = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* Key A */
0xff, 0x07, 0x80, /* Access bits */
0x69, /* GPB */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff /* Key B */
};
if ((mifare_classic_write (tag, first_sector_block, empty_data_block) < 0) ||
(mifare_classic_write (tag, first_sector_block + 1, empty_data_block) < 0) ||
(mifare_classic_write (tag, first_sector_block + 2, empty_data_block) < 0) ||
(mifare_classic_write (tag, first_sector_block + 3, default_trailer_block) < 0)) {
errno = EIO;
return -1;
}
return 0;
}

1
mifare_classic.h
View file

@ -53,6 +53,7 @@ int mifare_classic_decrement (MifareClassicTag tag, MifareClassicBlockNumber bl
int mifare_classic_restore (MifareClassicTag tag, MifareClassicBlockNumber block);
int mifare_classic_transfer (MifareClassicTag tag, MifareClassicBlockNumber block);
int mifare_classic_format_sector (MifareClassicTag tag, MifareClassicBlockNumber block);
/* MIFARE Classic Access Bits */
#define MCAB_R 0x8