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286df8f4eb
Add an interactive command for performing tear-off attacks on ST25TB/SRx monotonic counter blocks. This exploits EEPROM tearing to increment counters that normally can only be decremented, based on the near-field-chaos project by SecLabz. The command sweeps tear-off timing from --start downward in --adj microsecond steps, automatically consolidates partial writes, verifies stability across multiple reads, and reports progress in real-time with color-coded output. Performance optimizations: - One-time full iso14443b_setup() at start; subsequent field cycles use lightweight tearoff_field_on()/tearoff_field_off() that skip FPGA bitstream reload and buffer reallocation - Periodic CMD_WTX keepalives to prevent USB timeouts during long attacks - Calls FpgaResetBitstream() on exit to ensure clean FPGA state Usage: hf 14b tearoff -b <block> -d <target> [--start <us>] [--adj <us>]