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lrp cmac 8

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merlokk 2021-08-18 13:15:20 +03:00
commit 8aaeb6b542
2 changed files with 11 additions and 0 deletions
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10
client/src/mifare/lrpcrypto.c
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@ -265,3 +265,13 @@ void LRPCMAC(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac) {
LRPEvalLRP(ctx, y, CRYPTO_AES128_KEY_SIZE * 2, true, cmac);
}
void LRPCMAC8(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac) {
uint8_t cmac_tmp[16] = {0};
memset(cmac, 0x00, 8);
LRPCMAC(ctx, data, datalen, cmac_tmp);
for (int i = 0; i < 8; i++)
cmac[i] = cmac_tmp[i * 2 + 1];
}

1
client/src/mifare/lrpcrypto.h
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@ -56,5 +56,6 @@ void LRPEncode(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *resp, si
void LRPDecode(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *resp, size_t *resplen);
void LRPGenSubkeys(uint8_t *key, uint8_t *sk1, uint8_t *sk2);
void LRPCMAC(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac);
void LRPCMAC8(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac);
#endif // __LRPCRYPTO_H