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test session keys

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This commit is contained in:
merlokk 2021-08-13 00:00:24 +03:00
commit 9e79326eed
2 changed files with 19 additions and 0 deletions
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18
client/src/mifare/desfirecrypto.c
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@ -619,6 +619,24 @@ int DesfireEV2CalcCMAC(DesfireContext *ctx, uint8_t cmd, uint8_t *data, size_t d
return aes_cmac8(NULL, ctx->sessionKeyMAC, mdata, mac, mdatalen);
}
void DesfireGenTransSessionKey(uint8_t *key, uint32_t trCntr, uint8_t *uid, bool forMAC, uint8_t *sessionkey) {
uint8_t xiv[CRYPTO_AES_BLOCK_SIZE] = {0};
if (forMAC) {
xiv[0] = 0x5a;
} else {
xiv[0] = 0xa5;
}
xiv[2] = 0x01;
xiv[4] = 0x80;
Uint4byteToMemLe(&xiv[5], trCntr + 1);
memcpy(&xiv[9], uid, 7);
DesfireContext ctx = {0};
DesfireSetKey(&ctx, 0, T_AES, key);
DesfireCryptoCMACEx(&ctx, DCOMainKey, xiv, 16, 0, sessionkey);
}
int desfire_get_key_length(DesfireCryptoAlgorythm key_type) {
switch (key_type) {
case T_DES:

1
client/src/mifare/desfirecrypto.h
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@ -137,6 +137,7 @@ void DesfireGenSessionKeyEV1(const uint8_t rnda[], const uint8_t rndb[], Desfire
void DesfireGenSessionKeyEV2(uint8_t *key, uint8_t *rndA, uint8_t *rndB, bool enckey, uint8_t *sessionkey);
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 desfire_get_key_length(DesfireCryptoAlgorythm key_type);
size_t desfire_get_key_block_length(DesfireCryptoAlgorythm key_type);