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em: display nr of flips

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This commit is contained in:
Philippe Teuwen 2020-10-16 01:30:08 +02:00
parent b589699c38
commit d4e6a5b7a6
1 changed files with 6 additions and 1 deletions
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7
client/src/cmdlfem4x.c
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@ -2013,7 +2013,12 @@ static int CmdEM4x05Unlock(const char *Cmd) {
for (int i=0; i < 8; i++) {
bitstring[i] = bitflips & (0xF << ((7-i) * 4)) ? 'x' : '.';
}
PrintAndLogEx(INFO, "Bitflips => %s", bitstring);
// compute number of bits flipped
uint32_t i = bitflips;
i = i - ((i >> 1) & 0x55555555);
i = (i & 0x33333333) + ((i >> 2) & 0x33333333);
i = (((i + (i >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24;
PrintAndLogEx(INFO, "Bitflips: %2u events => %s", i, bitstring);
PrintAndLogEx(INFO, "New protection word => " _CYAN_("%08X") "\n", word14b);
PrintAndLogEx(INFO, "Try " _YELLOW_("`lf em 4x05_dump`"));
}