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lrp cmac protocol level

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This commit is contained in:
merlokk 2021-08-19 16:37:55 +03:00
parent e55c8f969a
commit 8bd14245c6
2 changed files with 20 additions and 0 deletions
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18
client/src/mifare/desfirecrypto.c
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@ -668,6 +668,24 @@ void DesfireGenTransSessionKey(uint8_t *key, uint32_t trCntr, uint8_t *uid, bool
DesfireCryptoCMACEx(&ctx, DCOMainKey, xiv, 16, 0, sessionkey);
}
int DesfireLRPCalcCMAC(DesfireContext *ctx, uint8_t cmd, uint8_t *data, size_t datalen, uint8_t *mac) {
uint8_t mdata[1050] = {0};
size_t mdatalen = 0;
mdata[0] = cmd;
Uint2byteToMemLe(&mdata[1], ctx->cmdCntr);
memcpy(&mdata[3], ctx->TI, 4);
if (data != NULL && datalen > 0)
memcpy(&mdata[7], data, datalen);
mdatalen = 1 + 2 + 4 + datalen;
LRPContext lctx = {0};
LRPSetKey(&lctx, ctx->sessionKeyMAC, 0, true);
LRPCMAC8(&lctx, mdata, mdatalen, mac);
return 0;
}
int desfire_get_key_length(DesfireCryptoAlgorythm key_type) {
switch (key_type) {
case T_DES:

2
client/src/mifare/desfirecrypto.h
View file

@ -144,6 +144,8 @@ void DesfireEV2FillIV(DesfireContext *ctx, bool ivforcommand, uint8_t *iv);
int DesfireEV2CalcCMAC(DesfireContext *ctx, uint8_t cmd, uint8_t *data, size_t datalen, uint8_t *mac);
void DesfireGenTransSessionKey(uint8_t *key, uint32_t trCntr, uint8_t *uid, bool forMAC, uint8_t *sessionkey);
int DesfireLRPCalcCMAC(DesfireContext *ctx, uint8_t cmd, uint8_t *data, size_t datalen, uint8_t *mac);
int desfire_get_key_length(DesfireCryptoAlgorythm key_type);
size_t desfire_get_key_block_length(DesfireCryptoAlgorythm key_type);
size_t padded_data_length(const size_t nbytes, const size_t block_size);