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LRPIncCounter

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merlokk 2021-08-14 11:52:32 +03:00
commit ae3ba512f0
3 changed files with 54 additions and 0 deletions
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32
client/src/mifare/desfiretest.c
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@ -586,6 +586,37 @@ static bool TestLRPEval(void) {
return res;
}
static bool TestLRPIncCounter(void) {
bool res = true;
uint8_t ctr1[] = {0x00, 0x01};
LRPIncCounter(ctr1, 4);
uint8_t ctrr1[] = {0x00, 0x02};
res = res && (memcmp(ctr1, ctrr1, sizeof(ctrr1)) == 0);
uint8_t ctr2[] = {0x00, 0xf0};
LRPIncCounter(ctr2, 3);
uint8_t ctrr2[] = {0x01, 0x00};
res = res && (memcmp(ctr2, ctrr2, sizeof(ctrr2)) == 0);
uint8_t ctr3[] = {0xff, 0xf0};
LRPIncCounter(ctr3, 3);
uint8_t ctrr3[] = {0x00, 0x00};
res = res && (memcmp(ctr3, ctrr3, sizeof(ctrr3)) == 0);
uint8_t ctr4[] = {0xf0};
LRPIncCounter(ctr4, 1);
uint8_t ctrr4[] = {0x00};
res = res && (memcmp(ctr4, ctrr4, sizeof(ctrr4)) == 0);
if (res)
PrintAndLogEx(INFO, "LRP inc counter... " _GREEN_("passed"));
else
PrintAndLogEx(ERR, "LRP inc counter... " _RED_("fail"));
return res;
}
bool DesfireTest(bool verbose) {
bool res = true;
@ -607,6 +638,7 @@ bool DesfireTest(bool verbose) {
res = res && TestLRPPlaintexts();
res = res && TestLRPUpdatedKeys();
res = res && TestLRPEval();
res = res && TestLRPIncCounter();
PrintAndLogEx(INFO, "---------------------------");
if (res)

20
client/src/mifare/lrpcrypto.c
View file

@ -100,3 +100,23 @@ void LRPEvalLRP(LRPContext *ctx, uint8_t *iv, size_t ivlen, bool final, uint8_t
if (final)
aes_encode(NULL, y, const00, y, CRYPTO_AES128_KEY_SIZE);
}
void LRPIncCounter(uint8_t *ctr, size_t ctrlen) {
bool carry = true;
for (int i = ctrlen - 1; i >= 0; i--) {
uint8_t nk = (i % 2) ? ctr[i / 2] & 0x0f : (ctr[i / 2] >> 4) & 0x0f;
if (carry)
nk++;
carry = (nk > 0xf);
if (i % 2)
ctr[i / 2] = (ctr[i / 2] & 0xf0) | (nk & 0x0f);
else
ctr[i / 2] = (ctr[i / 2] & 0x0f) | ((nk << 4) & 0xf0);
if(!carry)
break;
}
}

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

@ -42,5 +42,7 @@ void LRPSetKey(LRPContext *ctx, uint8_t *key, size_t updatedKeyNum, bool useBitP
void LRPGeneratePlaintexts(LRPContext *ctx, size_t plaintextsCount);
void LRPGenerateUpdatedKeys(LRPContext *ctx, size_t updatedKeysCount);
void LRPEvalLRP(LRPContext *ctx, uint8_t *iv, size_t ivlen, bool final, uint8_t *y);
void LRPIncCounter(uint8_t *ctr, size_t ctrlen);
void LRPEncode(LRPContext *ctx, uint8_t *ctr, size_t ctrlen, uint8_t *resp, size_t *resplen);
#endif // __LRPCRYPTO_H