crewID/libfreefare
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Rename some internal functions.

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A function with DES in its name that can perform AES crypto is somewhat
disturbing.
This commit is contained in:
Romain Tartiere 2010-12-24 14:10:44 +00:00
parent 7837fa967d
commit e587e26aeb
3 changed files with 17 additions and 17 deletions
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2
libfreefare/freefare_internal.h
View file

@ -146,7 +146,7 @@ typedef enum {
void *mifare_cryto_preprocess_data (MifareTag tag, void *data, size_t *nbytes, off_t offset, int communication_settings);
void *mifare_cryto_postprocess_data (MifareTag tag, void *data, ssize_t *nbytes, int communication_settings);
void mifare_cbc_des (MifareTag tag, MifareDESFireKey key, uint8_t *ivect, uint8_t *data, size_t data_size, MifareCryptoDirection direction, MifareCryptoOperation operation);
void mifare_cypher_blocks_chained (MifareTag tag, MifareDESFireKey key, uint8_t *ivect, uint8_t *data, size_t data_size, MifareCryptoDirection direction, MifareCryptoOperation operation);
void rol (uint8_t *data, const size_t len);
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);

6
libfreefare/mifare_desfire.c
View file

@ -351,7 +351,7 @@ authenticate (MifareTag tag, uint8_t cmd, uint8_t key_no, MifareDESFireKey key)
uint8_t PICC_RndB[16];
memcpy (PICC_RndB, PICC_E_RndB, key_length);
mifare_cbc_des (tag, key, MIFARE_DESFIRE (tag)->ivect, PICC_RndB, key_length, MCD_RECEIVE, MCO_DECYPHER);
mifare_cypher_blocks_chained (tag, key, MIFARE_DESFIRE (tag)->ivect, PICC_RndB, key_length, MCD_RECEIVE, MCO_DECYPHER);
uint8_t PCD_RndA[16];
RAND_bytes (PCD_RndA, 16);
@ -364,7 +364,7 @@ authenticate (MifareTag tag, uint8_t cmd, uint8_t key_no, MifareDESFireKey key)
memcpy (token, PCD_RndA, key_length);
memcpy (token+key_length, PCD_r_RndB, key_length);
mifare_cbc_des (tag, key, MIFARE_DESFIRE (tag)->ivect, token, 2 * key_length, MCD_SEND, (0x0A == cmd) ? MCO_DECYPHER : MCO_ENCYPHER);
mifare_cypher_blocks_chained (tag, key, MIFARE_DESFIRE (tag)->ivect, token, 2 * key_length, MCD_SEND, (0x0A == cmd) ? MCO_DECYPHER : MCO_ENCYPHER);
BUFFER_INIT (cmd2, 33);
@ -378,7 +378,7 @@ authenticate (MifareTag tag, uint8_t cmd, uint8_t key_no, MifareDESFireKey key)
uint8_t PICC_RndA_s[16];
memcpy (PICC_RndA_s, PICC_E_RndA_s, key_length);
mifare_cbc_des (tag, key, MIFARE_DESFIRE (tag)->ivect, PICC_RndA_s, key_length, MCD_RECEIVE, MCO_DECYPHER);
mifare_cypher_blocks_chained (tag, key, MIFARE_DESFIRE (tag)->ivect, PICC_RndA_s, key_length, MCD_RECEIVE, MCO_DECYPHER);
uint8_t PCD_RndA_s[key_length];
memcpy (PCD_RndA_s, PCD_RndA, key_length);

26
libfreefare/mifare_desfire_crypto.c
View file

@ -71,7 +71,7 @@
#define CMAC_LENGTH 8
static void xor (const uint8_t *ivect, uint8_t *data, const size_t len);
static void mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareCryptoDirection direction, MifareCryptoOperation operation, size_t block_size);
static void mifare_cypher_single_block (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareCryptoDirection direction, MifareCryptoOperation operation, size_t block_size);
static void desfire_crc32_byte (uint32_t *crc, const uint8_t value);
static size_t key_macing_length (MifareDESFireKey key);
@ -114,7 +114,7 @@ cmac_generate_subkeys (MifareDESFireKey key)
uint8_t ivect[kbs];
memset (ivect, 0, kbs);
mifare_cbc_des (NULL, key, ivect, l, kbs, MCD_RECEIVE, MCO_ENCYPHER);
mifare_cypher_blocks_chained (NULL, key, ivect, l, kbs, MCD_RECEIVE, MCO_ENCYPHER);
bool xor = false;
@ -154,7 +154,7 @@ cmac (const MifareDESFireKey key, uint8_t *ivect, const uint8_t *data, size_t le
xor (key->cmac_sk1, buffer + len - kbs, kbs);
}
mifare_cbc_des (NULL, key, ivect, buffer, len, MCD_SEND, MCO_ENCYPHER);
mifare_cypher_blocks_chained (NULL, key, ivect, buffer, len, MCD_SEND, MCO_ENCYPHER);
memcpy (cmac, ivect, kbs);
@ -342,11 +342,11 @@ mifare_cryto_preprocess_data (MifareTag tag, void *data, size_t *nbytes, off_t o
// ... and 0 padding
memset ((uint8_t *)res + *nbytes, 0, edl - *nbytes);
mifare_cbc_des (tag, NULL, NULL, (uint8_t *) res + offset, edl - offset, MCD_SEND, MCO_ENCYPHER);
mifare_cypher_blocks_chained (tag, NULL, NULL, (uint8_t *) res + offset, edl - offset, MCD_SEND, MCO_ENCYPHER);
memcpy (mac, (uint8_t *)res + edl - 8, 4);
// Copy again provided data (was overwritten by mifare_cbc_des)
// Copy again provided data (was overwritten by mifare_cypher_blocks_chained)
memcpy (res, data, *nbytes);
if (!(communication_settings & MAC_COMMAND))
@ -424,7 +424,7 @@ mifare_cryto_preprocess_data (MifareTag tag, void *data, size_t *nbytes, off_t o
*nbytes = edl;
mifare_cbc_des (tag, NULL, NULL, (uint8_t *) res + offset, *nbytes - offset, MCD_SEND, (AS_NEW == MIFARE_DESFIRE (tag)->authentication_scheme) ? MCO_ENCYPHER : MCO_DECYPHER);
mifare_cypher_blocks_chained (tag, NULL, NULL, (uint8_t *) res + offset, *nbytes - offset, MCD_SEND, (AS_NEW == MIFARE_DESFIRE (tag)->authentication_scheme) ? MCO_ENCYPHER : MCO_DECYPHER);
break;
case T_AES:
@ -443,7 +443,7 @@ mifare_cryto_preprocess_data (MifareTag tag, void *data, size_t *nbytes, off_t o
pdl = padded_data_length (*nbytes - offset, key_block_size (MIFARE_DESFIRE (tag)->session_key));
memset ((uint8_t *)res + *nbytes, 0, (offset + pdl) - (*nbytes));
}
mifare_cbc_des (tag, NULL, NULL, (uint8_t *)res + offset, pdl, MCD_SEND, MCO_ENCYPHER);
mifare_cypher_blocks_chained (tag, NULL, NULL, (uint8_t *)res + offset, pdl, MCD_SEND, MCO_ENCYPHER);
*nbytes = offset + pdl;
break;
@ -499,7 +499,7 @@ mifare_cryto_postprocess_data (MifareTag tag, void *data, ssize_t *nbytes, int c
memcpy (edata, data, *nbytes - 1);
memset ((uint8_t *)edata + *nbytes - 1, 0, edl - *nbytes + 1);
mifare_cbc_des (tag, NULL, NULL, edata, edl, MCD_SEND, MCO_ENCYPHER);
mifare_cypher_blocks_chained (tag, NULL, NULL, edata, edl, MCD_SEND, MCO_ENCYPHER);
if (0 != memcmp ((uint8_t *)data + *nbytes - 1, (uint8_t *)edata + edl - 8, 4)) {
warnx ("MACing not verified");
@ -554,7 +554,7 @@ mifare_cryto_postprocess_data (MifareTag tag, void *data, ssize_t *nbytes, int c
(*nbytes)--;
switch (MIFARE_DESFIRE (tag)->authentication_scheme) {
case AS_LEGACY:
mifare_cbc_des (tag, NULL, NULL, res, *nbytes, MCD_RECEIVE, MCO_DECYPHER);
mifare_cypher_blocks_chained (tag, NULL, NULL, res, *nbytes, MCD_RECEIVE, MCO_DECYPHER);
/*
* Look for the CRC and ensure it is followed by NULL padding. We
@ -594,7 +594,7 @@ mifare_cryto_postprocess_data (MifareTag tag, void *data, ssize_t *nbytes, int c
break;
case AS_NEW:
mifare_cbc_des (tag, NULL, NULL, res, *nbytes, MCD_RECEIVE, MCO_DECYPHER);
mifare_cypher_blocks_chained (tag, NULL, NULL, res, *nbytes, MCD_RECEIVE, MCO_DECYPHER);
uint8_t *p = ((uint8_t *)res) + *nbytes - 1;
while (!*p) {
p--;
@ -637,7 +637,7 @@ mifare_cryto_postprocess_data (MifareTag tag, void *data, ssize_t *nbytes, int c
}
static void
mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareCryptoDirection direction, MifareCryptoOperation operation, size_t block_size)
mifare_cypher_single_block (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareCryptoDirection direction, MifareCryptoOperation operation, size_t block_size)
{
AES_KEY k;
uint8_t ovect[MAX_CRYPTO_BLOCK_SIZE];
@ -724,7 +724,7 @@ mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareCryptoDir
* function with tag, key and ivect defined.
*/
void
mifare_cbc_des (MifareTag tag, MifareDESFireKey key, uint8_t *ivect, uint8_t *data, size_t data_size, MifareCryptoDirection direction, MifareCryptoOperation operation)
mifare_cypher_blocks_chained (MifareTag tag, MifareDESFireKey key, uint8_t *ivect, uint8_t *data, size_t data_size, MifareCryptoDirection direction, MifareCryptoOperation operation)
{
size_t block_size;
@ -759,7 +759,7 @@ mifare_cbc_des (MifareTag tag, MifareDESFireKey key, uint8_t *ivect, uint8_t *da
size_t offset = 0;
while (offset < data_size) {
mifare_des (key, data + offset, ivect, direction, operation, block_size);
mifare_cypher_single_block (key, data + offset, ivect, direction, operation, block_size);
offset += block_size;
}
}