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New API function: mifare_classic_trailer_block().

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This commit is contained in:
Romain Tartiere 2009-12-19 06:10:44 +00:00
parent b97012ac05
commit 7ed4561f74
3 changed files with 34 additions and 4 deletions
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30
mifare_classic.c
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@ -69,6 +69,12 @@ union mifare_classic_block {
MifareClassicBlockNumber address__;
MifareClassicBlockNumber address___;
} value;
struct {
MifareClassicKey key_a;
uint8_t access_bits[3];
uint8_t gpb;
MifareClassicKey key_b;
} trailer;
};
typedef unsigned char MifareClassicAccessBits;
@ -677,3 +683,27 @@ mifare_classic_format_sector (MifareClassicTag tag, MifareClassicBlockNumber blo
return 0;
}
/*
* Generates a MIFARE trailer block.
*/
void
mifare_classic_trailer_block (MifareClassicBlock *block, MifareClassicKey key_a, uint8_t ab_0, uint8_t ab_1, uint8_t ab_2, uint8_t ab_tb, uint8_t gpb, MifareClassicKey key_b)
{
union mifare_classic_block *b = (union mifare_classic_block *)block; // *((union mifare_classic_block *)(&block));
memcpy (b->trailer.key_a, key_a, sizeof (MifareClassicKey));
uint32_t access_bits = ((((( ab_0 & 0x4) >> 2) << 8) | (((ab_0 & 0x2) >> 1) << 4) | (ab_0 & 0x1)) |
(((((ab_1 & 0x4) >> 2) << 8) | (((ab_1 & 0x2) >> 1) << 4) | (ab_1 & 0x1)) << 1) |
(((((ab_2 & 0x4) >> 2) << 8) | (((ab_2 & 0x2) >> 1) << 4) | (ab_2 & 0x1)) << 2) |
(((((ab_tb & 0x4) >> 2) << 8) | (((ab_tb & 0x2) >> 1) << 4) | (ab_tb & 0x1)) << 3));
uint32_t access_bits_ = ((~access_bits) & 0x00000fff);
uint32_t ab = htole32(((access_bits << 12) | access_bits_));
memcpy (&(b->trailer.access_bits), &ab, 3);
b->trailer.gpb = gpb;
memcpy (b->trailer.key_b, key_b, sizeof (MifareClassicKey));
}