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Bluetooth: Add support for LE SC numeric comparison

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After the Pairing Confirm and Random PDUs have been exchanged in LE SC
it's time to generate a numeric comparison value using a new smp_g2
cryptographic function (which also builds on AES-CMAC). This patch adds
the smp_g2 implementation and updates the Pairing Random PDU handler to
proceed with the value genration and user confirmation.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-06-06 11:39:49 +03:00 committed by Marcel Holtmann
parent dcee2b3221
commit 191dc7fe2d
1 changed files with 70 additions and 1 deletions
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71
net/bluetooth/smp.c
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@ -175,6 +175,32 @@ static int smp_f4(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32],
return err;
}
static int smp_g2(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32],
const u8 x[16], const u8 y[16], u32 *val)
{
u8 m[80], tmp[16];
int err;
BT_DBG("u %32phN", u);
BT_DBG("v %32phN", v);
BT_DBG("x %16phN y %16phN", x, y);
memcpy(m, y, 16);
memcpy(m + 16, v, 32);
memcpy(m + 48, u, 32);
err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
if (err)
return err;
*val = get_unaligned_le32(tmp);
*val %= 1000000;
BT_DBG("val %06u", *val);
return 0;
}
static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
{
struct blkcipher_desc desc;
@ -1270,6 +1296,10 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_conn *hcon = conn->hcon;
u8 *pkax, *pkbx, *na, *nb;
u32 passkey;
int err;
BT_DBG("conn %p", conn);
@ -1279,7 +1309,46 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
skb_pull(skb, sizeof(smp->rrnd));
return smp_random(smp);
if (!test_bit(SMP_FLAG_SC, &smp->flags))
return smp_random(smp);
if (hcon->out) {
u8 cfm[16];
err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
smp->rrnd, 0, cfm);
if (err)
return SMP_UNSPECIFIED;
if (memcmp(smp->pcnf, cfm, 16))
return SMP_CONFIRM_FAILED;
pkax = smp->local_pk;
pkbx = smp->remote_pk;
na = smp->prnd;
nb = smp->rrnd;
} else {
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
smp->prnd);
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
pkax = smp->remote_pk;
pkbx = smp->local_pk;
na = smp->rrnd;
nb = smp->prnd;
}
err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
if (err)
return SMP_UNSPECIFIED;
err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
hcon->type, hcon->dst_type,
passkey, 0);
if (err)
return SMP_UNSPECIFIED;
return 0;
}
static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)