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fix communication modes. header length not counts as data

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merlokk 2021-07-27 18:29:34 +03:00
commit 9bcb30256e
1 changed files with 5 additions and 3 deletions
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8
client/src/mifare/desfiresecurechan.c
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@ -120,6 +120,8 @@ static const CmdHeaderLengthsS CmdHeaderLengths[] = {
{MFDES_CHANGE_CONFIGURATION, 1},
{MFDES_CHANGE_FILE_SETTINGS, 1},
{MFDES_CREATE_TRANS_MAC_FILE, 5},
{MFDES_READ_DATA, 7},
{MFDES_WRITE_DATA, 7},
};
static uint8_t DesfireGetCmdHeaderLen(uint8_t cmd) {
@ -190,7 +192,7 @@ static void DesfireSecureChannelEncodeEV1(DesfireContext *ctx, uint8_t cmd, uint
// we calc MAC anyway
// if encypted channel and no data - we only calc MAC
if (ctx->commMode == DCMPlain || ctx->commMode == DCMMACed || (ctx->commMode == DCMEncrypted && srcdatalen == 0)) {
if (ctx->commMode == DCMPlain || ctx->commMode == DCMMACed || (ctx->commMode == DCMEncrypted && srcdatalen <= hdrlen)) {
data[0] = cmd;
memcpy(&data[1], srcdata, srcdatalen);
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
@ -198,7 +200,7 @@ static void DesfireSecureChannelEncodeEV1(DesfireContext *ctx, uint8_t cmd, uint
memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen;
if (srcdatalen != 0 && ctx->commMode == DCMMACed) {
if (srcdatalen > hdrlen && ctx->commMode == DCMMACed) {
memcpy(&dstdata[srcdatalen], cmac, DesfireGetMACLength(ctx));
*dstdatalen = srcdatalen + DesfireGetMACLength(ctx);
}
@ -227,7 +229,7 @@ static void DesfireSecureChannelEncodeEV1(DesfireContext *ctx, uint8_t cmd, uint
void DesfireSecureChannelEncode(DesfireContext *ctx, uint8_t cmd, uint8_t *srcdata, size_t srcdatalen, uint8_t *dstdata, size_t *dstdatalen) {
ctx->lastCommand = cmd;
ctx->lastRequestZeroLen = (srcdatalen == 0);
ctx->lastRequestZeroLen = (srcdatalen <= DesfireGetCmdHeaderLen(cmd));
switch (ctx->secureChannel) {
case DACd40: