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Bluetooth: Organize SMP crypto functions to logical sections

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This patch organizes the various SMP crypto functions so that the LE SC
functions appear in one section and the legacy SMP functions in a
separate one.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-12-02 13:39:23 +02:00 committed by Marcel Holtmann
parent cd08279762
commit 06edf8deb5
1 changed files with 72 additions and 64 deletions
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136
net/bluetooth/smp.c
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@ -141,6 +141,10 @@ static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
dst[len - 1 - i] = src[i];
}
/* The following functions map to the LE SC SMP crypto functions
* AES-CMAC, f4, f5, f6, g2 and h6.
*/
static int aes_cmac(struct crypto_hash *tfm, const u8 k[16], const u8 *m,
size_t len, u8 mac[16])
{
@ -325,6 +329,26 @@ static int smp_g2(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32],
return 0;
}
static int smp_h6(struct crypto_hash *tfm_cmac, const u8 w[16],
const u8 key_id[4], u8 res[16])
{
int err;
SMP_DBG("w %16phN key_id %4phN", w, key_id);
err = aes_cmac(tfm_cmac, w, key_id, 4, res);
if (err)
return err;
SMP_DBG("res %16phN", res);
return err;
}
/* The following functions map to the legacy SMP crypto functions e, c1,
* s1 and ah.
*/
static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
{
struct blkcipher_desc desc;
@ -364,18 +388,59 @@ static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
return err;
}
static int smp_h6(struct crypto_hash *tfm_cmac, const u8 w[16],
const u8 key_id[4], u8 res[16])
static int smp_c1(struct crypto_blkcipher *tfm_aes, const u8 k[16],
const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
{
u8 p1[16], p2[16];
int err;
memset(p1, 0, 16);
/* p1 = pres || preq || _rat || _iat */
p1[0] = _iat;
p1[1] = _rat;
memcpy(p1 + 2, preq, 7);
memcpy(p1 + 9, pres, 7);
/* p2 = padding || ia || ra */
memcpy(p2, ra, 6);
memcpy(p2 + 6, ia, 6);
memset(p2 + 12, 0, 4);
/* res = r XOR p1 */
u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
/* res = e(k, res) */
err = smp_e(tfm_aes, 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_aes, k, res);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static int smp_s1(struct crypto_blkcipher *tfm_aes, const u8 k[16],
const u8 r1[16], const u8 r2[16], u8 _r[16])
{
int err;
SMP_DBG("w %16phN key_id %4phN", w, key_id);
/* Just least significant octets from r1 and r2 are considered */
memcpy(_r, r2, 8);
memcpy(_r + 8, r1, 8);
err = aes_cmac(tfm_cmac, w, key_id, 4, res);
err = smp_e(tfm_aes, k, _r);
if (err)
return err;
SMP_DBG("res %16phN", res);
BT_ERR("Encrypt data error");
return err;
}
@ -454,63 +519,6 @@ int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
return 0;
}
static int smp_c1(struct crypto_blkcipher *tfm_aes, const u8 k[16],
const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
{
u8 p1[16], p2[16];
int err;
memset(p1, 0, 16);
/* p1 = pres || preq || _rat || _iat */
p1[0] = _iat;
p1[1] = _rat;
memcpy(p1 + 2, preq, 7);
memcpy(p1 + 9, pres, 7);
/* p2 = padding || ia || ra */
memcpy(p2, ra, 6);
memcpy(p2 + 6, ia, 6);
memset(p2 + 12, 0, 4);
/* res = r XOR p1 */
u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
/* res = e(k, res) */
err = smp_e(tfm_aes, 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_aes, k, res);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static int smp_s1(struct crypto_blkcipher *tfm_aes, const u8 k[16],
const u8 r1[16], const u8 r2[16], u8 _r[16])
{
int err;
/* Just least significant octets from r1 and r2 are considered */
memcpy(_r, r2, 8);
memcpy(_r + 8, r1, 8);
err = smp_e(tfm_aes, k, _r);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
{
struct l2cap_chan *chan = conn->smp;