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splitbysize works correctly in the all the cases

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merlokk 2021-07-05 14:00:51 +03:00
parent 003a0b0de4
commit 96d18a1cd7
1 changed files with 46 additions and 6 deletions
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48
client/src/mifare/desfirecore.c
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@ -699,6 +699,32 @@ static void DesfireSecureChannelDecode(DesfireContext *ctx, uint8_t *srcdata, si
}
}
// move data from blockdata [format: <length, data><length, data>...] to single data block
static void DesfireJoinBlockToBytes(uint8_t *blockdata, size_t blockdatacount, size_t blockdatasize, uint8_t *dstdata, size_t *dstdatalen) {
*dstdatalen = 0;
for(int i = 0; i < blockdatacount; i++) {
memcpy(&dstdata[*dstdatalen], &blockdata[i * blockdatasize + 1], blockdata[i * blockdatasize]);
*dstdatalen += blockdata[i * blockdatasize];
}
}
// move data from single data block to blockdata [format: <length, data><length, data>...]
// lengths in the blockdata is not changed. result - in the blockdata
static void DesfireSplitBytesToBlock(uint8_t *blockdata, size_t *blockdatacount, size_t blockdatasize, uint8_t *dstdata, size_t dstdatalen) {
size_t len = 0;
for(int i = 0; i < *blockdatacount; i++) {
size_t tlen = len + blockdata[i * blockdatasize];
if (tlen > dstdatalen)
tlen = dstdatalen;
if (len == tlen) {
*blockdatacount = i;
break;
}
memcpy(&blockdata[i * blockdatasize + 1], &dstdata[len], tlen - len);
len = tlen;
}
}
int DesfireExchangeEx(bool activate_field, DesfireContext *ctx, uint8_t cmd, uint8_t *data, size_t datalen, uint8_t *respcode, uint8_t *resp, size_t *resplen, bool enable_chaining, size_t splitbysize) {
int res = PM3_SUCCESS;
@ -707,14 +733,28 @@ int DesfireExchangeEx(bool activate_field, DesfireContext *ctx, uint8_t cmd, uin
switch(ctx->cmdSet) {
case DCCNative:
DesfireSecureChannelEncode(ctx, cmd, data, datalen, databuf, &databuflen);
res = DesfireExchangeNative(activate_field, ctx, cmd, databuf, databuflen, respcode, databuf, &databuflen, enable_chaining, splitbysize);
DesfireSecureChannelDecode(ctx, databuf, databuflen, *respcode, resp, resplen);
break;
case DCCNativeISO:
DesfireSecureChannelEncode(ctx, cmd, data, datalen, databuf, &databuflen);
if (ctx->cmdSet == DCCNative)
res = DesfireExchangeNative(activate_field, ctx, cmd, databuf, databuflen, respcode, databuf, &databuflen, enable_chaining, splitbysize);
else
res = DesfireExchangeISO(activate_field, ctx, cmd, databuf, databuflen, respcode, databuf, &databuflen, enable_chaining, splitbysize);
if (splitbysize) {
uint8_t sdata[250 * 5] = {0};
size_t sdatalen = 0;
DesfireJoinBlockToBytes(databuf, databuflen, splitbysize, sdata, &sdatalen);
//PrintAndLogEx(INFO, "block : %s", sprint_hex(sdata, sdatalen));
DesfireSecureChannelDecode(ctx, sdata, sdatalen, *respcode, resp, resplen);
DesfireSplitBytesToBlock(databuf, &databuflen, splitbysize, resp, *resplen);
memcpy(resp, databuf, databuflen * splitbysize);
*resplen = databuflen;
} else {
DesfireSecureChannelDecode(ctx, databuf, databuflen, *respcode, resp, resplen);
}
break;
case DCCISO:
return PM3_EAPDU_FAIL;