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This commit is contained in:
Philippe Teuwen 2019-03-10 00:00:59 +01:00
commit 0373696662
483 changed files with 56514 additions and 52451 deletions
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23
common/legic_prng.c
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@ -27,37 +27,42 @@ struct lfsr {
// it sets b to 0 aswell to make sure we get a all zero keystream out
// which is used in the initialisation phase sending the IV
//
void legic_prng_init(uint8_t iv) {
void legic_prng_init(uint8_t iv)
{
lfsr.a = iv;
lfsr.b = 0; // hack to get a always 0 keystream
lfsr.c = 0;
if(iv)
if (iv)
lfsr.b = (iv << 1) | 1;
}
void legic_prng_forward(int count) {
void legic_prng_forward(int count)
{
if (count == 0) return;
lfsr.c += count;
while(count--) {
while (count--) {
// 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;
}
}
uint32_t legic_prng_count() {
uint32_t legic_prng_count()
{
return lfsr.c;
}
uint8_t legic_prng_get_bit() {
uint8_t idx = 7 - ( (lfsr.a & 4) | (lfsr.a >> 2 & 2) | (lfsr.a >> 4 & 1) );
uint8_t legic_prng_get_bit()
{
uint8_t idx = 7 - ((lfsr.a & 4) | (lfsr.a >> 2 & 2) | (lfsr.a >> 4 & 1));
return lfsr.b >> idx & 1;
}
uint32_t legic_prng_get_bits(uint8_t len){
uint32_t legic_prng_get_bits(uint8_t len)
{
uint32_t a = 0;
for(uint8_t i = 0; i < len; ++i) {
for (uint8_t i = 0; i < len; ++i) {
a |= legic_prng_get_bit() << i;
legic_prng_forward(1);
}