Libnfc ST SRx reading/writing tool

Tool to read/write ST SRx tags. Only tested with SRIX4K tags, your mileage with SRI512 tags may vary.

Building

Requires libnfc (discovered with pkg-config) and CMake.

mkdir build
cd build
cmake ..
make

Usage

usage: ./nfc_st_srx [-h] [-v] [-w | -d] [-t x4k|512] [-f FILE]

Options:
  -h         Show this help message
  -v         Verbose - print transceived messages
  -w         Write dump instead of reading
  -d         Dry run - check for potential irreversible changes instead of writing
  -f FILE    Dump (write) memory content to (from) FILE
  -f -       Dump (write) memory content to stdout (from stdin) (default)
  -t x4k|512 Select SRIX4K or SRI512 tag type. Default is SRIX4K

Note on writing tags

Compliant ST SRx tags have some blocks that, once changed, cannot be changed back to their original value. Before writing a tag, make sure you're aware of this.

I implemented a "dry run" check feature which reads the tag and compares it with the dump to see if writing the dump would cause irreversible changes.

However, I would advise you not to trust it as it's not been heavily tested.