From: Dmitry Kasatkin <dmitry.kasatkin@xxxxxxxxx>
hmac(sha256) will be used for AMP key generation.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@xxxxxxxxx>
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
net/bluetooth/pal.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/net/bluetooth/pal.c b/net/bluetooth/pal.c
index cb1fa86..2526891 100644
--- a/net/bluetooth/pal.c
+++ b/net/bluetooth/pal.c
@@ -12,6 +12,7 @@
*/
#include <net/bluetooth/pal.h>
+#include <crypto/hash.h>
/* Remote AMP Controllers handling */
static void amp_ctrl_get(struct amp_ctrl *ctrl)
@@ -120,3 +121,37 @@ struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
return hcon;
}
+
+int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
+{
+ int ret = 0;
+ struct crypto_shash *tfm;
+
+ if (!ksize)
+ return -EINVAL;
+
+ tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
+ if (IS_ERR(tfm)) {
+ BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
+ return PTR_ERR(tfm);
+ }
+
+ ret = crypto_shash_setkey(tfm, key, ksize);
+ if (ret) {
+ BT_DBG("crypto_ahash_setkey failed: err %d", ret);
+ } else {
+ struct {
+ struct shash_desc shash;
+ char ctx[crypto_shash_descsize(tfm)];
+ } desc;
+
+ desc.shash.tfm = tfm;
+ desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ ret = crypto_shash_digest(&desc.shash, plaintext, psize,
+ output);
+ }
+
+ crypto_free_shash(tfm);
+ return ret;
+}
--
1.7.9.5
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