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Add a block_size parameter to mifare_des().

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This commit is contained in:
Romain Tartiere 2010-10-29 12:34:11 +00:00
parent 356219e21b
commit a0b9df6ece
2 changed files with 22 additions and 16 deletions
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4
libfreefare/freefare_internal.h
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@ -96,6 +96,8 @@
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define MAX_CRYPTO_BLOCK_SIZE 8
struct mad_sector_0x00;
struct mad_sector_0x10;
@ -183,7 +185,7 @@ struct mifare_desfire_tag {
char *last_pcd_error;
MifareDESFireKey session_key;
uint8_t authenticated_key_no;
uint8_t ivect[16];
uint8_t ivect[MAX_CRYPTO_BLOCK_SIZE];
uint8_t *crypto_buffer;
size_t crypto_buffer_size;
uint8_t block_number;

34
libfreefare/mifare_desfire_authenticate.c
View file

@ -28,7 +28,7 @@
#include "freefare_internal.h"
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, MifareDirection direction, int mac);
static void mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareDirection direction, int mac, size_t block_size);
static size_t padded_data_length (size_t nbytes);
static size_t maced_data_length (size_t nbytes);
@ -240,16 +240,17 @@ 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, MifareDirection direction, int mac)
mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareDirection direction, int mac, size_t block_size)
{
uint8_t ovect[8];
uint8_t ovect[MAX_CRYPTO_BLOCK_SIZE];
if (direction == MD_SEND) {
xor (ivect, data, 8);
xor (ivect, data, block_size);
} else {
memcpy (ovect, data, 8);
memcpy (ovect, data, block_size);
}
uint8_t edata[8];
uint8_t edata[MAX_CRYPTO_BLOCK_SIZE];
switch (key->type) {
case T_DES:
@ -258,7 +259,6 @@ mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareDirection
} else {
DES_ecb_encrypt ((DES_cblock *) data, (DES_cblock *) edata, &(key->ks1), DES_DECRYPT);
}
memcpy (data, edata, 8);
break;
case T_3DES:
if (mac) {
@ -270,31 +270,35 @@ mifare_des (MifareDESFireKey key, uint8_t *data, uint8_t *ivect, MifareDirection
DES_ecb_encrypt ((DES_cblock *) edata, (DES_cblock *) data, &(key->ks2), DES_ENCRYPT);
DES_ecb_encrypt ((DES_cblock *) data, (DES_cblock *) edata, &(key->ks1), DES_DECRYPT);
}
memcpy (data, edata, 8);
break;
}
memcpy (data, edata, block_size);
if (direction == MD_SEND) {
memcpy (ivect, data, 8);
memcpy (ivect, data, block_size);
} else {
xor (ivect, data, 8);
memcpy (ivect, ovect, 8);
xor (ivect, data, block_size);
memcpy (ivect, ovect, block_size);
}
}
void
mifare_cbc_des (MifareDESFireKey key, uint8_t *ivect, uint8_t *data, size_t data_size, MifareDirection direction, int mac)
{
size_t block_size;
switch (key->type) {
case T_DES:
case T_3DES:
bzero (ivect, 8);
bzero (ivect, MAX_CRYPTO_BLOCK_SIZE);
block_size = 8;
break;
}
size_t offset = 0;
while (offset < data_size) {
mifare_des (key, data + offset, ivect, direction, mac);
offset += 8;
mifare_des (key, data + offset, ivect, direction, mac, block_size);
offset += block_size;
}
}