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Make use of the now available Tk info

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This commit is contained in:
Philippe Teuwen 2010-10-14 18:33:17 +00:00
parent cbca45e21c
commit ffe50562dd
5 changed files with 17 additions and 9 deletions
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14
examples/nfc-relay-picc.c
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@ -320,13 +320,21 @@ main (int argc, char *argv[])
// | +-------- DR=2,4 DS=2,4 => supports 106, 212 & 424bps in both directions
// +----------- TA,TB,TC, FSCI=5 => FSC=64
// It seems hazardous to tell we support NAD if the tag doesn't support NAD but I don't know how to disable it
// PC/SC pseudo-ATR = 3B 80 80 01 01
// PC/SC pseudo-ATR = 3B 80 80 01 01 if there is no historical bytes
// Creates ATS and copy max 48 bytes of Tk:
byte_t * pbtTk;
size_t szTk;
pbtTk = iso14443a_locate_historical_bytes (ntEmulatedTarget.nti.nai.abtAts, ntEmulatedTarget.nti.nai.szAts, &szTk);
szTk = (szTk > 48) ? 48 : szTk;
byte_t pbtTkt[48];
memcpy(pbtTkt, pbtTk, szTk);
ntEmulatedTarget.nti.nai.abtAts[0] = 0x75;
ntEmulatedTarget.nti.nai.abtAts[1] = 0x33;
ntEmulatedTarget.nti.nai.abtAts[2] = 0x92;
ntEmulatedTarget.nti.nai.abtAts[3] = 0x03;
ntEmulatedTarget.nti.nai.szAtsLen = 4;
//FIXME we could actually emulate also the historical bytes of the tag once libnfc API supports it...
ntEmulatedTarget.nti.nai.szAtsLen = 4 + szTk;
memcpy(&(ntEmulatedTarget.nti.nai.abtAts[4]), pbtTkt, szTk);
printf("We will emulate:\n");
print_nfc_iso14443a_info (ntEmulatedTarget.nti.nai);

2
include/nfc/nfc-types.h
View file

@ -206,7 +206,7 @@ typedef struct {
size_t szUidLen;
byte_t abtUid[10];
size_t szAtsLen;
byte_t abtAts[36];
byte_t abtAts[254]; // Maximal theoretical ATS is FSD-2, FSD=256 for FSDI=8 in RATS
} nfc_iso14443a_info_t;
/**

2
include/nfc/nfc.h
View file

@ -107,7 +107,7 @@ extern "C" {
/* Misc. functions */
NFC_EXPORT void iso14443a_crc (byte_t * pbtData, size_t szLen, byte_t * pbtCrc);
NFC_EXPORT void append_iso14443a_crc (byte_t * pbtData, size_t szLen);
NFC_EXPORT byte_t * iso14443a_extract_historical_bytes (byte_t * pbtAts, size_t szAts, size_t * pszHB);
NFC_EXPORT byte_t * iso14443a_locate_historical_bytes (byte_t * pbtAts, size_t szAts, size_t * pszTk);
NFC_EXPORT const char *nfc_version (void);
/* Common device-level errors */

2
libnfc/chips/pn53x.c
View file

@ -1184,7 +1184,7 @@ pn53x_target_init (nfc_device_t * pnd, const nfc_target_mode_t ntm, nfc_target_t
pbtMifareParams = abtMifareParams;
// Historical Bytes
pbtHBt = iso14443a_extract_historical_bytes (pnt->nti.nai.abtAts, pnt->nti.nai.szAtsLen, &szHBt);
pbtHBt = iso14443a_locate_historical_bytes (pnt->nti.nai.abtAts, pnt->nti.nai.szAtsLen, &szHBt);
}
break;

6
libnfc/iso14443-subr.c
View file

@ -54,7 +54,7 @@ append_iso14443a_crc (byte_t * pbtData, size_t szLen)
}
byte_t *
iso14443a_extract_historical_bytes(byte_t * pbtAts, size_t szAts, size_t * pszHB)
iso14443a_locate_historical_bytes(byte_t * pbtAts, size_t szAts, size_t * pszTk)
{
if (szAts) {
size_t offset = 1;
@ -68,10 +68,10 @@ iso14443a_extract_historical_bytes(byte_t * pbtAts, size_t szAts, size_t * pszHB
offset++;
}
if (szAts > offset) {
*pszHB = (szAts-offset);
*pszTk = (szAts-offset);
return (pbtAts+offset);
}
}
*pszHB = 0;
*pszTk = 0;
return NULL;
}