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ev2 rx channel sketch

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This commit is contained in:
merlokk
2021-08-03 18:49:52 +03:00
parent 58e8693b49
commit 8d84e96716
1 changed files with 47 additions and 1 deletions
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48
client/src/mifare/desfiresecurechan.c
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@@ -262,7 +262,6 @@ static void DesfireSecureChannelEncodeEV2(DesfireContext *ctx, uint8_t cmd, uint
*dstdatalen = srcdatalen + DesfireGetMACLength(ctx);
}
} else if (ctx->commMode == DCMEncrypted) {
//uint8_t iv[CRYPTO_AES_BLOCK_SIZE] = {0};
DesfireEV2FillIV(ctx, true, NULL); // fill IV to ctx
rlen = padded_data_length(srcdatalen + 1 - hdrlen, desfire_get_key_block_length(ctx->keyType));
@@ -415,6 +414,53 @@ static void DesfireSecureChannelDecodeEV2(DesfireContext *ctx, uint8_t *srcdata,
memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen;
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
// if comm mode = plain --> response with MAC
// if request is not zero length --> response MAC
if (ctx->commMode == DCMPlain || ctx->commMode == DCMMACed || (ctx->commMode == DCMEncrypted && !ctx->lastRequestZeroLen)) {
if (srcdatalen < DesfireGetMACLength(ctx)) {
memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen;
return;
}
memcpy(dstdata, srcdata, srcdatalen - DesfireGetMACLength(ctx));
*dstdatalen = srcdatalen - DesfireGetMACLength(ctx);
DesfireEV2CalcCMAC(ctx, 0x00, srcdata, *dstdatalen, cmac);
if (memcmp(&srcdata[*dstdatalen], cmac, DesfireGetMACLength(ctx)) != 0) {
PrintAndLogEx(WARNING, "Received MAC is not match with calculated");
PrintAndLogEx(INFO, " received MAC: %s", sprint_hex(&srcdata[*dstdatalen], desfire_get_key_block_length(ctx->keyType)));
PrintAndLogEx(INFO, " calculated MAC: %s", sprint_hex(cmac, desfire_get_key_block_length(ctx->keyType)));
}
} else if (ctx->commMode == DCMEncrypted) {
if (srcdatalen < desfire_get_key_block_length(ctx->keyType) + DesfireGetMACLength(ctx)) {
memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen;
return;
}
*dstdatalen = srcdatalen - DesfireGetMACLength(ctx);
DesfireEV2CalcCMAC(ctx, 0x00, srcdata, *dstdatalen, cmac);
if (memcmp(&srcdata[*dstdatalen], cmac, DesfireGetMACLength(ctx)) != 0) {
PrintAndLogEx(WARNING, "Received MAC is not match with calculated");
PrintAndLogEx(INFO, " received MAC: %s", sprint_hex(&srcdata[*dstdatalen], desfire_get_key_block_length(ctx->keyType)));
PrintAndLogEx(INFO, " calculated MAC: %s", sprint_hex(cmac, desfire_get_key_block_length(ctx->keyType)));
}
DesfireEV2FillIV(ctx, true, NULL); // fill IV to ctx
DesfireCryptoEncDec(ctx, true, srcdata, *dstdatalen, dstdata, false);
PrintAndLogEx(INFO, "decoded[%d]: %s", *dstdatalen, sprint_hex(dstdata, *dstdatalen));
size_t puredatalen = FindISO9797M2PaddingDataLen(dstdata, *dstdatalen);
if (puredatalen != 0) {
*dstdatalen = puredatalen;
} else {
PrintAndLogEx(WARNING, "Padding search error.");
}
}
}
void DesfireSecureChannelDecode(DesfireContext *ctx, uint8_t *srcdata, size_t srcdatalen, uint8_t respcode, uint8_t *dstdata, size_t *dstdatalen) {