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mac calc

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This commit is contained in:
merlokk
2021-08-03 17:55:28 +03:00
parent e7414e127d
commit fa30947698
2 changed files with 14 additions and 0 deletions
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13
client/src/mifare/desfirecrypto.c
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@@ -474,6 +474,19 @@ void DesfireEV2FillIV(DesfireContext *ctx, bool ivforcommand, uint8_t *iv) {
memcpy(iv, xiv, CRYPTO_AES_BLOCK_SIZE);
}
int DesfireEV2CalcCMAC(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;
return aes_cmac8(NULL, ctx->sessionKeyMAC, mdata, mac, mdatalen);
}
void desfire_crc32(const uint8_t *data, const size_t len, uint8_t *crc) {
crc32_ex(data, len, crc);

1
client/src/mifare/desfirecrypto.h
View File

@@ -113,6 +113,7 @@ uint8_t DesfireCommModeToFileCommMode(DesfireCommunicationMode comm_mode);
void DesfireGenSessionKeyEV1(const uint8_t rnda[], const uint8_t rndb[], DesfireCryptoAlgorythm keytype, uint8_t *key);
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 desfire_crc32(const uint8_t *data, const size_t len, uint8_t *crc);
void desfire_crc32_append(uint8_t *data, const size_t len);