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cmac 2tdea works

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merlokk 2021-08-08 18:33:35 +03:00
commit a86f332263
2 changed files with 47 additions and 27 deletions
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50
client/src/mifare/desfirecrypto.c
View file

@ -344,38 +344,34 @@ void MifareKdfAn10922(DesfireContext *ctx, const uint8_t *data, size_t len) {
return;
}
// AES uses 16 byte IV
if (kbs < CRYPTO_AES_BLOCK_SIZE)
kbs = CRYPTO_AES_BLOCK_SIZE;
int kbs2 = kbs * 2;
uint8_t sk1[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
uint8_t sk2[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
DesfireCMACGenerateSubkeys(ctx, DCOMainKey, sk1, sk2);
// reserv atleast 32bytes.
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
uint8_t buffer[DESFIRE_MAX_CRYPTO_BLOCK_SIZE * 2] = {0};
buffer[0] = 0x01;
memcpy(&buffer[1], data, len++);
if (ctx->keyType == T_AES) {
// AES uses 16 byte IV
if (kbs < CRYPTO_AES_BLOCK_SIZE)
kbs = CRYPTO_AES_BLOCK_SIZE;
uint8_t cmac[DESFIRE_MAX_CRYPTO_BLOCK_SIZE] = {0};
DesfireCryptoCMACEx(ctx, buffer, len, kbs2, cmac);
memcpy(ctx->key, cmac, kbs);
buffer[0] = 0x01;
memcpy(&buffer[1], data, len++);
/*if (len != (kbs2)) {
buffer[len++] = 0x80;
while (len % kbs2) {
buffer[len++] = 0x00;
}
bin_xor(buffer + kbs, sk2, kbs);
} else {
bin_xor(buffer + kbs, sk1, kbs);
DesfireCryptoCMACEx(ctx, buffer, len, kbs * 2, cmac);
memcpy(ctx->key, cmac, kbs);
} else if (ctx->keyType == T_3DES) {
buffer[0] = 0x21;
memcpy(&buffer[1], data, len);
DesfireClearIV(ctx);
DesfireCryptoCMACEx(ctx, buffer, len + 1, kbs * 2, cmac);
buffer[0] = 0x22;
memcpy(&buffer[1], data, len);
DesfireClearIV(ctx);
DesfireCryptoCMACEx(ctx, buffer, len + 1, kbs * 2, &cmac[kbs]);
memcpy(ctx->key, cmac, kbs * 2);
}
aes_encode(NULL, ctx->key, buffer, buffer, kbs2);
memcpy(ctx->key, buffer + kbs, kbs);*/
}
void DesfireDESKeySetVersion(uint8_t *key, DesfireCryptoAlgorythm keytype, uint8_t version) {

24
client/src/mifare/desfiretest.c
View file

@ -154,6 +154,29 @@ static bool TestAn10922KDFAES(void) {
return res;
}
static bool TestAn10922KDF2TDEA(void) {
bool res = true;
uint8_t key[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF};
DesfireContext dctx;
DesfireSetKey(&dctx, 0, T_3DES, key);
memcpy(dctx.sessionKeyMAC, key, sizeof(key));
uint8_t kdfInput[] = {0x04, 0x78, 0x2E, 0x21, 0x80, 0x1D, 0x80, 0x30, 0x42, 0xF5, 0x4E, 0x58, 0x50, 0x20, 0x41};
MifareKdfAn10922(&dctx, kdfInput, sizeof(kdfInput));
uint8_t dkey[] = {0x16, 0xF8, 0x59, 0x7C, 0x9E, 0x89, 0x10, 0xC8, 0x6B, 0x96, 0x48, 0xD0, 0x06, 0x10, 0x7D, 0xD7};
res = res && (memcmp(dctx.key, dkey, sizeof(dkey)) == 0);
if (res)
PrintAndLogEx(INFO, "2TDEA An10922..... " _GREEN_("passed"));
else
PrintAndLogEx(ERR, "2TDEA An10922..... " _RED_("fail"));
return res;
}
// https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/TDES_CMAC.pdf
static bool TestCMAC3TDEA(void) {
bool res = true;
@ -414,6 +437,7 @@ bool DesfireTest(bool verbose) {
res = res && TestCRC32();
res = res && TestCMACSubkeys();
res = res && TestAn10922KDFAES();
res = res && TestAn10922KDF2TDEA();
res = res && TestCMAC3TDEA();
res = res && TestCMAC2TDEA();
res = res && TestCMACDES();