Mifare dumps parser
dump.mfd -- Mifare 4k dump for testing.
- 010 Editor — hex editor that has Mifare template. Very handy for editing
- mfterm — Mifare terminal. Also can view and edit
pip install bitstring
The total memory of 1024 bytes in Mifare Classic (1k) and 4096 bytes in Mifare 4k is divided into 16 sectors of 64 bytes, each of the sectors is divided into 4 blocks of 16 bytes. Blocks 0, 1 and 2 of each sector can store data and block 3 is used to store keys and access bits (the exception is the ‘Manufacturer Block’ which can not store data).
The memory of 1KB and 4KB MIFARE Classic cards is ordered in a similar way. On both cards the first block (block 0) contains the UID, BCC, SAK, ATQA and Manufacturer data. This block is locked and cannot be altered. But some times it can be ;)
Data stored in the sector trailer:
01 02 03 04 05 06 FF 07 80 69 11 12 13 14 15 16
01 02 03 04 05 06 – Key A
FF 07 80 69 – Access bits
11 12 13 14 15 16 – Key B (or data if Key B is not used)
Bytes 6, 7, 8 are access data
FF 07 80
11111111 = FF
(0)0000111 = 07
**(1)000(0)**000 = 80
The bits that are bolded and in parentheses are the ones that define access to keys (C13, C23, C33 in the image above) and they form the 001 sequence. The bits that are bolded and not in parentheses are the same bits inverted. They form, as expected, the sequence 110.
From the table above I can see that 001 means that Key A can not be read, but can be written and Key B may be read. This is the "transport configuration" and was read from the card that was never used.
|T=CL||ISO 14443-4 protocol|
|T=0||ISO 7816-3 character-level protocol|
|T=1||ISO 7816-3 block-level protocol|
|UID||Unique Identifier, Type A|
|RID||Random ID, typically dynamically generated at Power-on Reset (UID0 = “0x08”, Random number in UID1… UID3)|
|ATQA||Answer To Request, type A|
|ATQB||Answer To Request, type B|
|SAK||Select Acknowledge, Type A|
|RATS||Request for Answer To Select|
|ATS||Answer To Select|
|ATR||Anser To Reset What's really ATR means|
|APDU||Application Protocol Data Unit|
|DIF||Dual Interface (cards)|
|COS||Card Operating System|
|CL||Cascade Level acc. to ISO/IEC 14443-3|
|CT||Cascade Tag, Type A|
|NFC||Near Field Communication|
|PCD||Proximity Coupling Device (“Contactless Reader”)|
|PICC||Proximity Integrated Circuit (“Contactless Card”)|
|PKE||Public Key Encryption (like RSA or ECC)|
|REQA||Request Command, Type A (command 0x26)|
|WUPA||Wake-up type A (command 0x52)|
|SEL||Select Command, Type A|
|RFU||Reserved for future use|
SAK (Select Acknowledge, Type A) parsing
Other bits in SAK (b1, b2, b4, b5, b7, b8) is not described in ISO 14443-3.
ATR is for contact cards and is specified in ISO 7816. For contacless cards, it is the PC/SC reader (IFD) that generates the ATR.
The ATR is constructed based on:
ATS (Answer to Select) for ISO 14443 Type A cards ATQB and ATTRIB bytes for ISO 14443 Type B cards The ATR will be of the form 3B 8X 80 01 HB_ATS Parity_Byte where X is the number of bytes of Historical Bytes of ATS (HB_ATS).
The exact construction of ATR for contactless cards is given in section 22.214.171.124.3 of the PC/SC spec.
Given that the only variable is ATS, it should be the same regardless of the reader.