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Bluetooth: Add LE SMP Cryptoolbox functions

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This patch implements SMP crypto functions called ah, c1, s1 and e.
It also implements auxiliary functions. All These functions are needed
for SMP keys generation.

Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Anderson Lizardo <anderson.lizardo@openbossa.org>
Signed-off-by: Bruna Moreira <bruna.moreira@openbossa.org>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Anderson Briglia 2011-06-09 18:50:44 -03:00 committed by Gustavo F. Padovan
parent 3a0259bb80
commit d22ef0bc83
1 changed files with 117 additions and 0 deletions
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117
net/bluetooth/smp.c
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@ -24,6 +24,123 @@
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/smp.h>
#include <linux/crypto.h>
#include <crypto/b128ops.h>
static inline void swap128(u8 src[16], u8 dst[16])
{
int i;
for (i = 0; i < 16; i++)
dst[15 - i] = src[i];
}
static inline void swap56(u8 src[7], u8 dst[7])
{
int i;
for (i = 0; i < 7; i++)
dst[6 - i] = src[i];
}
static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
{
struct blkcipher_desc desc;
struct scatterlist sg;
int err, iv_len;
unsigned char iv[128];
if (tfm == NULL) {
BT_ERR("tfm %p", tfm);
return -EINVAL;
}
desc.tfm = tfm;
desc.flags = 0;
err = crypto_blkcipher_setkey(tfm, k, 16);
if (err) {
BT_ERR("cipher setkey failed: %d", err);
return err;
}
sg_init_one(&sg, r, 16);
iv_len = crypto_blkcipher_ivsize(tfm);
if (iv_len) {
memset(&iv, 0xff, iv_len);
crypto_blkcipher_set_iv(tfm, iv, iv_len);
}
err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16);
if (err)
BT_ERR("Encrypt data error %d", err);
return err;
}
static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16],
u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia,
u8 _rat, bdaddr_t *ra, u8 res[16])
{
u8 p1[16], p2[16];
int err;
memset(p1, 0, 16);
/* p1 = pres || preq || _rat || _iat */
swap56(pres, p1);
swap56(preq, p1 + 7);
p1[14] = _rat;
p1[15] = _iat;
memset(p2, 0, 16);
/* p2 = padding || ia || ra */
baswap((bdaddr_t *) (p2 + 4), ia);
baswap((bdaddr_t *) (p2 + 10), ra);
/* res = r XOR p1 */
u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
/* res = e(k, res) */
err = smp_e(tfm, k, res);
if (err) {
BT_ERR("Encrypt data error");
return err;
}
/* res = res XOR p2 */
u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
/* res = e(k, res) */
err = smp_e(tfm, k, res);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16],
u8 r1[16], u8 r2[16], u8 _r[16])
{
int err;
/* Just least significant octets from r1 and r2 are considered */
memcpy(_r, r1 + 8, 8);
memcpy(_r + 8, r2 + 8, 8);
err = smp_e(tfm, k, _r);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static int smp_rand(u8 *buf)
{
get_random_bytes(buf, 16);
return 0;
}
static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code,
u16 dlen, void *data)