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key version

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This commit is contained in:
merlokk 2021-07-15 14:53:48 +03:00
commit 3eb8523079
2 changed files with 34 additions and 0 deletions
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31
client/src/mifare/desfirecrypto.c
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@ -311,7 +311,38 @@ void DesfireCryptoCMAC(DesfireContext *ctx, uint8_t *data, size_t len, uint8_t *
memcpy(cmac, ctx->IV, kbs);
}
void DesfireDESKeySetVersion(uint8_t *key, DesfireCryptoAlgorythm keytype, uint8_t version) {
if (keytype == T_AES)
return;
// clear version
for (int n = 0; n < desfire_get_key_length(keytype); n++)
key[n] &= 0xFE;
// set version
for (int n = 0; n < 8; n++) {
uint8_t version_bit = ((version & (1 << (7 - n))) >> (7 - n));
key[n] &= 0xFE;
key[n] |= version_bit;
if (keytype == T_DES) {
key[n + 8] = key->data[n];
} else {
// Write ~version to avoid turning a 3DES key into a DES key
key->data[n + 8] &= 0xFE;
key->data[n + 8] |= ~version_bit;
}
}
}
uint8_t DesfireDESKeyGetVersion(uint8_t *key) {
uint8_t version = 0;
for (int n = 0; n < 8; n++) {
version = version << 1;
version |= (key[n] & 0xFE);
}
}
void desfire_crc32(const uint8_t *data, const size_t len, uint8_t *crc) {
crc32_ex(data, len, crc);
}

3
client/src/mifare/desfirecrypto.h
View file

@ -101,6 +101,9 @@ void DesfireCryptoEncDec(DesfireContext *ctx, bool use_session_key, uint8_t *src
void DesfireCryptoEncDecEx(DesfireContext *ctx, bool use_session_key, uint8_t *srcdata, size_t srcdatalen, uint8_t *dstdata, bool encode, uint8_t *iv);
void DesfireCryptoCMAC(DesfireContext *ctx, uint8_t *srcdata, size_t srcdatalen, uint8_t *cmac);
void DesfireDESKeySetVersion(uint8_t *key, DesfireCryptoAlgorythm keytype, uint8_t version);
uint8_t DesfireDESKeyGetVersion(uint8_t *key);
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);
bool desfire_crc32_check(uint8_t *data, const size_t len, uint8_t *crc);