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changekey command sketch

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merlokk 2021-07-15 14:54:15 +03:00
commit 557fc5bb97
2 changed files with 81 additions and 0 deletions
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78
client/src/mifare/desfirecore.c
View file

@ -988,6 +988,10 @@ int DesfireChangeKeySettings(DesfireContext *dctx, uint8_t *data, size_t len) {
return DesfireCommandTxData(dctx, MFDES_CHANGE_KEY_SETTINGS, data, len);
}
int DesfireChangeKeyCmd(DesfireContext *dctx, uint8_t *data, size_t len, uint8_t *resp, size_t *resplen) {
return DesfireCommand(dctx, MFDES_GET_KEY_VERSION, data, len, resp, resplen, -1);
}
uint8_t DesfireKeyAlgoToType(DesfireCryptoAlgorythm keyType) {
switch (keyType) {
case T_DES:
@ -1074,3 +1078,77 @@ void PrintKeySettings(uint8_t keysettings, uint8_t numkeys, bool applevel, bool
else
PrintKeySettingsPICC(keysettings, numkeys, print2ndbyte);
}
int DesfireChangeKey(DesfireContext *dctx, uint8_t newkeynum, DesfireCryptoAlgorythm newkeytype, uint32_t newkeyver, uint8_t *newkey, DesfireCryptoAlgorythm oldkeytype, uint8_t *oldkey) {
uint_8t okeybuf[DESFIRE_MAX_KEY_SIZE] = {0};
uint_8t nkeybuf[DESFIRE_MAX_KEY_SIZE] = {0};
uint_8t cdata[DESFIRE_MAX_KEY_SIZE + 10] = {0};
// DES -> 2TDEA
memcpy(okeybuf, oldkey, desfire_get_key_length(oldkeytype));
if (oldkeytype == MFDES_ALGO_DES) {
memcpy(&okeybuf[8], oldkey, 8);
oldkeytype = MFDES_ALGO_3DES;
}
memcpy(nkeybuf, newkey, desfire_get_key_length(newkeytype));
if (newkeytype == MFDES_ALGO_DES) {
memcpy(&nkeybuf[8], newkey, 8);
newkeytype = MFDES_ALGO_3DES;
}
size_t nkeylen = desfire_get_key_length(newkeytype);
// set key version for DES. if newkeyver > 0xff - setting key version is disabled
if (newkeytype != MFDES_ALGO_AES && newkeyver < 0x100)
DesfireDESKeySetVersion(nkeybuf, newkeytype, newkeyver);
// xor if we change current auth key
if (newkeynum == dctx->keyNum) {
memcpy(cdata, nkeybuf, nkeylen);
} else {
memcpy(cdata, nkeybuf, nkeylen);
binxor(cdata, okeybuf, nkeylen)
}
// add key version for AES
size_t cdatalen = nkeylen;
if (newkeytype == MFDES_ALGO_AES) {
cdata[cdatalen] = newkeyversion;
cdatalen++;
}
// add crc||crc_new_key
if (dctx->secureChannel == DACd40) {
iso14443a_crc_append(cdata, cdatalen);
cdatalen += 2;
if (newkeynum != dctx->keyNum) {
iso14443a_crc(nkeybuf, nkeylen, &cdata[cdatalen]);
cdatalen += 2;
}
} else {
desfire_crc32_append(cdata, cdatalen);
cdatalen += 4;
if (newkeynum != dctx->keyNum) {
desfire_crc32(nkeybuf, nkeylen, &cdata[cdatalen]);
cdatalen += 4;
}
}
// get padded data length
size_t rlen = padded_data_length(cdatalen, desfire_get_key_block_length(ctx->keyType));
// send command
uint8_t resp[257] = {0};
size_t resplen = 0;
int res = DesfireChangeKeyCmd(dctx, cdata, rlen, resp, resplen);
// check response
// clear auth
if (newkeynum == dctx->keyNum)
DesfireClearSession(dctx);
return PM3_SUCCESS;
}

3
client/src/mifare/desfirecore.h
View file

@ -55,4 +55,7 @@ int DesfireChangeKeySettings(DesfireContext *dctx, uint8_t *data, size_t len);
void PrintKeySettings(uint8_t keysettings, uint8_t numkeys, bool applevel, bool print2ndbyte);
uint8_t DesfireKeyAlgoToType(DesfireCryptoAlgorythm keyType);
int DesfireChangeKeyCmd(DesfireContext *dctx, uint8_t *data, size_t datalen, uint8_t *resp, size_t *resplen);
int DesfireChangeKey(DesfireContext *dctx, uint8_t newkeynum, DesfireCryptoAlgorythm newkeytype, uint32_t newkeyver, uint8_t *newkey, DesfireCryptoAlgorythm oldkeytype, uint8_t *oldkey);
#endif // __DESFIRECORE_H