/* Generate Keystream */
static uint32_t get_key_stream(int skip, int count)
{
- uint32_t key=0; int i;
-
- /* Use int to enlarge timer tc to 32bit */
- legic_prng_bc += prng_timer->TC_CV;
- prng_timer->TC_CCR = AT91C_TC_SWTRG;
-
- /* If skip == -1, forward prng time based */
- if(skip == -1) {
- i = (legic_prng_bc+SIM_SHIFT)/SIM_DIVISOR; /* Calculate Cycles based on timer */
- i -= legic_prng_count(); /* substract cycles of finished frames */
- i -= count; /* substract current frame length, rewidn to bedinning */
- legic_prng_forward(i);
- } else {
- legic_prng_forward(skip);
- }
+ uint32_t key=0; int i;
+
+ /* Use int to enlarge timer tc to 32bit */
+ legic_prng_bc += prng_timer->TC_CV;
+ prng_timer->TC_CCR = AT91C_TC_SWTRG;
+
+ /* If skip == -1, forward prng time based */
+ if(skip == -1) {
+ i = (legic_prng_bc+SIM_SHIFT)/SIM_DIVISOR; /* Calculate Cycles based on timer */
+ i -= legic_prng_count(); /* substract cycles of finished frames */
+ i -= count; /* substract current frame length, rewidn to bedinning */
+ legic_prng_forward(i);
+ } else {
+ legic_prng_forward(skip);
+ }
- /* Write Time Data into LOG */
- if(count == 6) { i = -1; } else { i = legic_read_count; }
- ((uint8_t*)BigBuf)[OFFSET_LOG+128+i] = legic_prng_count();
- ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4] = (legic_prng_bc >> 0) & 0xff;
- ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff;
- ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff;
- ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff;
- ((uint8_t*)BigBuf)[OFFSET_LOG+384+i] = count;
-
- /* Generate KeyStream */
- for(i=0; i<count; i++) {
- key |= legic_prng_get_bit() << i;
- legic_prng_forward(1);
- }
- return key;
+ /* Write Time Data into LOG */
+ uint8_t *BigBuf = BigBuf_get_addr();
+ i = (count == 6) ? -1 : legic_read_count;
+
+ BigBuf[OFFSET_LOG+128+i] = legic_prng_count();
+ BigBuf[OFFSET_LOG+256+i*4] = (legic_prng_bc >> 0) & 0xff;
+ BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff;
+ BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff;
+ BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff;
+ BigBuf[OFFSET_LOG+384+i] = count;
+
+ /* Generate KeyStream */
+ for(i=0; i<count; i++) {
+ key |= legic_prng_get_bit() << i;
+ legic_prng_forward(1);
+ }
+ return key;
}
/* Send a frame in tag mode, the FPGA must have been set up by
int nextbit = timer->TC_CV + TAG_TIME_BIT;
int bit = response & 1;
response = response >> 1;
- if(bit) {
+ if(bit)
AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- } else {
+ else
AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- }
+
while(timer->TC_CV < nextbit) ;
}
AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
int bit = data & 1;
data = data >> 1;
- if(bit ^ legic_prng_get_bit()) {
+ if(bit ^ legic_prng_get_bit())
bit_end = starttime + RWD_TIME_1;
- } else {
+ else
bit_end = starttime + RWD_TIME_0;
- }
+
/* RWD_TIME_PAUSE time off, then some time on, so that the complete bit time is
* RWD_TIME_x, where x is the bit to be transmitted */
AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
legic_prng_forward(1); /* bit duration is longest. use this time to forward the lfsr */
- while(timer->TC_CV < bit_end) ;
+ while(timer->TC_CV < bit_end);
}
- {
- /* One final pause to mark the end of the frame */
- int pause_end = timer->TC_CV + RWD_TIME_PAUSE;
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- while(timer->TC_CV < pause_end) ;
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- }
+ /* One final pause to mark the end of the frame */
+ int pause_end = timer->TC_CV + RWD_TIME_PAUSE;
+ AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+ while(timer->TC_CV < pause_end) ;
+ AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
+
/* Reset the timer, to measure time until the start of the tag frame */
timer->TC_CCR = AT91C_TC_SWTRG;
* since we cannot compute it on the fly while reading */
legic_prng_forward(2);
- if(crypt)
- {
+ if(crypt) {
for(i=0; i<bits; i++) {
data |= legic_prng_get_bit() << i;
legic_prng_forward(1);
static void frame_append_bit(struct legic_frame * const f, int bit)
{
- if(f->bits >= 31) {
+ if(f->bits >= 31)
return; /* Overflow, won't happen */
- }
+
f->data |= (bit<<f->bits);
f->bits++;
}
LegicCommonInit();
+ uint8_t *BigBuf = BigBuf_get_addr();
memset(BigBuf, 0, 1024);
DbpString("setting up legic card");
Dbprintf("Unknown card format: %x",tag_type);
return -1;
}
- if(bytes == -1) {
+ if(bytes == -1)
bytes = card_sz;
- }
- if(bytes+offset >= card_sz) {
+
+ if(bytes+offset >= card_sz)
bytes = card_sz-offset;
- }
perform_setup_phase_rwd(SESSION_IV);
LED_C_OFF();
return -1;
}
- ((uint8_t*)BigBuf)[byte_index] = r;
+ BigBuf[byte_index] = r;
WDT_HIT();
byte_index++;
if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
void LegicRfWriter(int bytes, int offset) {
int byte_index=0, addr_sz=0;
-
+ uint8_t *BigBuf = BigBuf_get_addr();
+
LegicCommonInit();
DbpString("setting up legic card");
perform_setup_phase_rwd(SESSION_IV);
legic_prng_forward(2);
while(byte_index < bytes) {
- int r = legic_write_byte(((uint8_t*)BigBuf)[byte_index+offset], byte_index+offset, addr_sz);
+ int r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz);
if((r != 0) || BUTTON_PRESS()) {
Dbprintf("operation aborted @ 0x%03.3x", byte_index);
switch_off_tag_rwd();
/* Handle (whether to respond) a frame in tag mode */
static void frame_handle_tag(struct legic_frame const * const f)
{
+ uint8_t *BigBuf = BigBuf_get_addr();
+
/* First Part of Handshake (IV) */
if(f->bits == 7) {
if(f->data == SESSION_IV) {
if(legic_state == STATE_CON) {
int key = get_key_stream(-1, 11); //legic_phase_drift, 11);
int addr = f->data ^ key; addr = addr >> 1;
- int data = ((uint8_t*)BigBuf)[addr];
+ int data = BigBuf[addr];
int hash = LegicCRC(addr, data, 11) << 8;
- ((uint8_t*)BigBuf)[OFFSET_LOG+legic_read_count] = (uint8_t)addr;
+ BigBuf[OFFSET_LOG+legic_read_count] = (uint8_t)addr;
legic_read_count++;
//Dbprintf("Data:%03.3x, key:%03.3x, addr: %03.3x, read_c:%u", f->data, key, addr, read_c);
int i;
Dbprintf("IV: %03.3x", legic_prng_iv);
for(i = 0; i<legic_read_count; i++) {
- Dbprintf("Read Nb: %u, Addr: %u", i, ((uint8_t*)BigBuf)[OFFSET_LOG+i]);
+ Dbprintf("Read Nb: %u, Addr: %u", i, BigBuf[OFFSET_LOG+i]);
}
for(i = -1; i<legic_read_count; i++) {
uint32_t t;
- t = ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4];
- t |= ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4+1] << 8;
- t |= ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4+2] <<16;
- t |= ((uint8_t*)BigBuf)[OFFSET_LOG+256+i*4+3] <<24;
+ t = BigBuf[OFFSET_LOG+256+i*4];
+ t |= BigBuf[OFFSET_LOG+256+i*4+1] << 8;
+ t |= BigBuf[OFFSET_LOG+256+i*4+2] <<16;
+ t |= BigBuf[OFFSET_LOG+256+i*4+3] <<24;
Dbprintf("Cycles: %u, Frame Length: %u, Time: %u",
- ((uint8_t*)BigBuf)[OFFSET_LOG+128+i],
- ((uint8_t*)BigBuf)[OFFSET_LOG+384+i],
+ BigBuf[OFFSET_LOG+128+i],
+ BigBuf[OFFSET_LOG+384+i],
t);
}
}
LED_B_ON();
DbpString("Starting Legic emulator, press button to end");
- while(!BUTTON_PRESS()) {
+ while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
int time = timer->TC_CV;
projects / proxmark3-svn / blobdiff