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FIX: legic_prng.c according to user on forum ref: http://www.proxmark.org/forum/viewtopic.php?pid=5437#p5437 needs to be "& 0x7F"

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ADD:  method for calculating the storage crc8.
This commit is contained in:
iceman1001 2016-02-12 12:34:05 +01:00
commit ee4e281675
3 changed files with 35 additions and 7 deletions
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4
common/legic_prng.c
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@ -26,7 +26,9 @@ void legic_prng_init(uint8_t init) {
void legic_prng_forward(int count) {
lfsr.c += count;
while(count--) {
lfsr.a = lfsr.a >> 1 | (lfsr.a ^ lfsr.a >> 6) << 6;
//lfsr.a = lfsr.a >> 1 | (lfsr.a ^ lfsr.a >> 6) << 6;
// According: http://www.proxmark.org/forum/viewtopic.php?pid=5437#p5437
lfsr.a = (lfsr.a >> 1 | (lfsr.a ^ lfsr.a >> 6) << 6) & 0x7F;
lfsr.b = lfsr.b >> 1 | (lfsr.b ^ lfsr.b >> 2 ^ lfsr.b >> 3 ^ lfsr.b >> 7) << 7;
}
}