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nfc-emulate-tag: some more doc & Mifare example (not complete)

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This commit is contained in:
Philippe Teuwen 2010-10-06 20:31:36 +00:00
parent b8d65f9b27
commit b74267901d
1 changed files with 33 additions and 2 deletions
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35
examples/nfc-emulate-tag.c
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@ -18,10 +18,14 @@
*/
/**
* @file nfc-emulate-ndef.c
* @file nfc-emulate-tag.c
* @brief Emulate a tag
*/
// Note that depending on the reader you'll use against this emulator
// it might work or not. Some readers are very strict on responses
// timings, e.g. a Nokia NFC and will drop communication too soon for us.
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif // HAVE_CONFIG_H
@ -43,6 +47,7 @@ static byte_t abtRx[MAX_FRAME_LEN];
static size_t szRxLen;
static nfc_device_t *pnd;
static bool quiet_output = false;
static bool init_mfc_auth = false;
bool
target_io( const nfc_target_t nt, const byte_t * pbtInput, const size_t szInput, byte_t * pbtOutput, size_t *pszOutput )
@ -57,6 +62,15 @@ target_io( const nfc_target_t nt, const byte_t * pbtInput, const size_t szInput,
}
if(szInput) {
switch(pbtInput[0]) {
case 0x60: // Mifare authA
case 0x61: // Mifare authB
// Let's give back a very random nonce...
*pszOutput = 2;
pbtOutput[0] = 0x12;
pbtOutput[1] = 0x34;
// Next commands will be without CRC
init_mfc_auth = true;
break;
case 0xe0: // RATS
// Send ATS
*pszOutput = nt.nti.nai.szAtsLen + 1;
@ -107,11 +121,15 @@ nfc_target_emulate_tag(nfc_device_t* pnd, const nfc_target_t nt)
}
}
if ( loop ) {
if ( init_mfc_auth ) {
nfc_configure (pnd, NDO_HANDLE_CRC, false);
init_mfc_auth = false;
}
if (!nfc_target_receive_bytes(pnd, abtRx, &szRxLen)) {
nfc_perror (pnd, "nfc_target_receive_bytes");
return false;
}
}
}
}
return true;
}
@ -135,6 +153,19 @@ main (int argc, char *argv[])
printf ("Connected to NFC device: %s\n", pnd->acName);
/*
// Example of a Mifare Classic Mini
// Note that crypto1 is not implemented in this example
nfc_target_t nt = {
.ntt = NTT_MIFARE,
.nti.nai.abtAtqa = { 0x00, 0x04 },
.nti.nai.abtUid = { 0x08, 0xab, 0xcd, 0xef },
.nti.nai.btSak = 0x09,
.nti.nai.szUidLen = 4,
.nti.nai.szAtsLen = 0,
};
*/
// Example of a ISO14443-4 (DESfire)
nfc_target_t nt = {
.ntt = NTT_MIFARE,
.nti.nai.abtAtqa = { 0x03, 0x44 },