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ch ev2/encode tx no data, rx with data works (getuid)

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merlokk 2021-08-04 16:38:10 +03:00
commit bf59d29919
1 changed files with 15 additions and 16 deletions
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31
client/src/mifare/desfiresecurechan.c
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@ -252,25 +252,24 @@ static void DesfireSecureChannelEncodeEV2(DesfireContext *ctx, uint8_t cmd, uint
uint8_t hdrlen = DesfireGetCmdHeaderLen(cmd); uint8_t hdrlen = DesfireGetCmdHeaderLen(cmd);
if (ctx->commMode == DCMPlain || ctx->commMode == DCMMACed || (ctx->commMode == DCMEncrypted && srcdatalen <= hdrlen)) { if (ctx->commMode == DCMMACed) {
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
DesfireEV2CalcCMAC(ctx, cmd, srcdata, srcdatalen, cmac);
if (ctx->commMode == DCMMACed || ctx->commMode == DCMEncrypted) { memcpy(&dstdata[srcdatalen], cmac, DesfireGetMACLength(ctx));
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0}; *dstdatalen = srcdatalen + DesfireGetMACLength(ctx);
DesfireEV2CalcCMAC(ctx, cmd, srcdata, srcdatalen, cmac);
memcpy(&dstdata[srcdatalen], cmac, DesfireGetMACLength(ctx));
*dstdatalen = srcdatalen + DesfireGetMACLength(ctx);
}
} else if (ctx->commMode == DCMEncrypted) { } else if (ctx->commMode == DCMEncrypted) {
DesfireEV2FillIV(ctx, true, NULL); // fill IV to ctx
rlen = padded_data_length(srcdatalen + 1 - hdrlen, desfire_get_key_block_length(ctx->keyType));
memcpy(data, &srcdata[hdrlen], srcdatalen - hdrlen);
data[hdrlen] = 0x80; // padding
dstdata[0] = cmd; dstdata[0] = cmd;
memcpy(&dstdata[1], srcdata, hdrlen); memcpy(&dstdata[1], srcdata, hdrlen);
DesfireCryptoEncDec(ctx, DCOSessionKeyEnc, data, rlen, &dstdata[1 + hdrlen], true);
if (srcdatalen > hdrlen) {
rlen = padded_data_length(srcdatalen + 1 - hdrlen, desfire_get_key_block_length(ctx->keyType));
memcpy(data, &srcdata[hdrlen], srcdatalen - hdrlen);
data[hdrlen] = 0x80; // padding
DesfireEV2FillIV(ctx, true, NULL); // fill IV to ctx
DesfireCryptoEncDec(ctx, DCOSessionKeyEnc, data, rlen, &dstdata[1 + hdrlen], true);
}
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0}; uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
DesfireEV2CalcCMAC(ctx, cmd, &dstdata[1], hdrlen + rlen, cmac); DesfireEV2CalcCMAC(ctx, cmd, &dstdata[1], hdrlen + rlen, cmac);
@ -418,7 +417,7 @@ static void DesfireSecureChannelDecodeEV2(DesfireContext *ctx, uint8_t *srcdata,
// if comm mode = plain --> response with MAC // if comm mode = plain --> response with MAC
// if request is not zero length --> response MAC // if request is not zero length --> response MAC
if (ctx->commMode == DCMPlain || ctx->commMode == DCMMACed || (ctx->commMode == DCMEncrypted && !ctx->lastRequestZeroLen)) { if (ctx->commMode == DCMPlain || ctx->commMode == DCMMACed) {
if (srcdatalen < DesfireGetMACLength(ctx)) { if (srcdatalen < DesfireGetMACLength(ctx)) {
memcpy(dstdata, srcdata, srcdatalen); memcpy(dstdata, srcdata, srcdatalen);
*dstdatalen = srcdatalen; *dstdatalen = srcdatalen;