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101 lines
2.7 KiB
Markdown
101 lines
2.7 KiB
Markdown
# Notes on MFU binary formats
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- new mfu format
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- old mfu format
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- plain mfu format
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- future mfu format
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## New mfu format
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The new mfu binary format was created to compensate for different manufactures tag functions.
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Like UL-Ev1 has three counter and tearing bytes, while NTAG only has one counter and tearing byte.
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PACK was removed from header, since its just normally part of the tag memory, unreadable, but when
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a proxmark3 dumps a tag and we have pwd/pack, we add those to their normal location in memory.
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This makes memory not a exact memory dump from a tag, but a "what it should have looked like" if we could read all memory
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```
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// New Ultralight/NTAG dump file format
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// Length must be aligned to 4 bytes (UL/NTAG page)
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#define MFU_DUMP_PREFIX_LENGTH 56
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typedef struct {
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uint8_t version[8];
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uint8_t tbo[2];
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uint8_t tbo1[1];
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uint8_t pages; // max page number in dump
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uint8_t signature[32];
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uint8_t counter_tearing[3][4]; // 3 bytes counter, 1 byte tearing flag
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uint8_t data[1024];
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} PACKED mfu_dump_t;
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```
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## Old mfu format
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The old binary format saved the extra data on tag in order for the Proxmark3 to able to simulate a real tag.
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```
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// Old Ultralight/NTAG dump file format
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#define OLD_MFU_DUMP_PREFIX_LENGTH 48
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typedef struct {
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uint8_t version[8];
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uint8_t tbo[2];
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uint8_t tearing[3];
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uint8_t pack[2];
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uint8_t tbo1[1];
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uint8_t signature[32];
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uint8_t data[1024];
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} old_mfu_dump_t;
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```
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## Plain mfu format
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The first binary format for MFU was just a memory dump from the tag block 0 to end.
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No extra data was saved.
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```
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uint8_t data[1024];
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```
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## future mfu format
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For developers of apps and other tools, like libnfc, we don't recommend using binary formats.
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We decided to adopt a JSON based format, which is much more flexible to changes of new tag functionality.
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Example
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```
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{
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"Created": "proxmark3",
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"FileType": "mfu",
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"Card": {
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"UID": "04F654CAFC388",
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"Version": "0004030101000B0",
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"TBO_0": "000",
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"TBO_1": "0",
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"Signature": "BC9BFD4B550C16B2B5A5ABA10B644A027B4CB03DDB46F94D992DC0FB02E0C3F",
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"Counter0": "00000",
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"Tearing0": "BD",
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"Counter1": "00000",
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"Tearing1": "BD",
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"Counter2": "00000",
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"Tearing2": "BD"
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},
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"blocks": {
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"0": "04F6542",
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"1": "CAFC388",
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"2": "8E48000",
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"3": "E110120",
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"4": "0103A00",
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"5": "340300F",
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"6": "0000000",
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"7": "0000000",
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"8": "0000000",
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"9": "0000000",
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"10": "0000000",
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"11": "0000000",
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"12": "1122334",
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"13": "0000000",
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"14": "0000000",
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"15": "0000000",
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"16": "000000F",
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"17": "0005000",
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"18": "0000000",
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"19": "0000000"
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}
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}
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```
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