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lrp maced tx works

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merlokk 2021-08-19 16:38:19 +03:00
parent 8bd14245c6
commit 4ae1912772
1 changed files with 39 additions and 0 deletions
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39
client/src/mifare/desfiresecurechan.c
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@ -381,6 +381,43 @@ static void DesfireSecureChannelEncodeEV2(DesfireContext *ctx, uint8_t cmd, uint
}
}
static void DesfireSecureChannelEncodeLRP(DesfireContext *ctx, uint8_t cmd, uint8_t *srcdata, size_t srcdatalen, uint8_t *dstdata, size_t *dstdatalen) {
uint8_t data[1050] = {0};
size_t rlen = 0;
memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen;
uint8_t hdrlen = DesfireGetCmdHeaderLen(cmd);
if (ctx->commMode == DCMMACed) {
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
DesfireLRPCalcCMAC(ctx, cmd, srcdata, srcdatalen, cmac);
memcpy(&dstdata[srcdatalen], cmac, DesfireGetMACLength(ctx));
*dstdatalen = srcdatalen + DesfireGetMACLength(ctx);
} else if (ctx->commMode == DCMEncrypted || ctx->commMode == DCMEncryptedWithPadding || ctx->commMode == DCMEncryptedPlain) {
memcpy(dstdata, srcdata, hdrlen);
if (srcdatalen > hdrlen) {
rlen = padded_data_length(srcdatalen + 1 - hdrlen, desfire_get_key_block_length(ctx->keyType));
memcpy(data, &srcdata[hdrlen], srcdatalen - hdrlen);
data[srcdatalen - hdrlen] = 0x80; // padding
DesfireEV2FillIV(ctx, true, NULL); // fill IV to ctx
DesfireCryptoEncDec(ctx, DCOSessionKeyEnc, data, rlen, &dstdata[hdrlen], true);
}
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
DesfireLRPCalcCMAC(ctx, cmd, dstdata, hdrlen + rlen, cmac);
memcpy(&dstdata[hdrlen + rlen], cmac, DesfireGetMACLength(ctx));
*dstdatalen = hdrlen + rlen + DesfireGetMACLength(ctx);
ctx->commMode = DCMEncrypted;
}
}
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 <= DesfireGetCmdHeaderLen(cmd));
@ -396,6 +433,8 @@ void DesfireSecureChannelEncode(DesfireContext *ctx, uint8_t cmd, uint8_t *srcda
DesfireSecureChannelEncodeEV2(ctx, cmd, srcdata, srcdatalen, dstdata, dstdatalen);
break;
case DACLRP:
DesfireSecureChannelEncodeLRP(ctx, cmd, srcdata, srcdatalen, dstdata, dstdatalen);
break;
case DACNone:
memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen;