ADD: `analyse nuid` - generates NUID 4byte from a UID 7byte. Mifare Classic Ev1...

[proxmark3-svn] / client / loclass / cipher.c

diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index 7d3950b1aef2711d03211305ad19573096a1b95d..6333b4b056642831abcc682b1e2f2e8ea206fc5d 100644 (file)
--- a/client/loclass/cipher.c
+++ b/client/loclass/cipher.c
@@ -241,6 +241,27 @@ void doMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4])
        //free(cc_nr);
     return;
 }
+void doMAC_N(uint8_t *address_data_p, uint8_t address_data_size, uint8_t *div_key_p, uint8_t mac[4])
+{
+       uint8_t *address_data;
+       uint8_t div_key[8];
+       address_data = (uint8_t*) malloc(address_data_size);
+
+       memcpy(address_data, address_data_p, address_data_size);
+       memcpy(div_key, div_key_p, 8);
+
+       reverse_arraybytes(address_data, address_data_size);
+       BitstreamIn bitstream = {address_data, address_data_size * 8, 0};
+       uint8_t dest []= {0,0,0,0,0,0,0,0};
+       BitstreamOut out = { dest, sizeof(dest)*8, 0 };
+       MAC(div_key, bitstream, out);
+       //The output MAC must also be reversed
+       reverse_arraybytes(dest, sizeof(dest));
+       memcpy(mac, dest, 4);
+       free(address_data);
+       return;
+}
+
 #ifndef ON_DEVICE
 int testMAC()
 {