From: Johan Hedberg <johan.hedberg@xxxxxxxxx>
Since the SMP code needs to swap ordering of variable length buffers add
a convenience function that can be used for any length buffer.
Signed-off-by: Johan Hedberg <johan.hedberg@xxxxxxxxx>
---
net/bluetooth/smp.c | 20 +++++++-------------
1 file changed, 7 insertions(+), 13 deletions(-)
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 513a92cb0356..142b6083a18a 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -64,18 +64,12 @@ struct smp_chan {
unsigned long flags;
};
-static inline void swap128(const u8 src[16], u8 dst[16])
+static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
{
- int i;
- for (i = 0; i < 16; i++)
- dst[15 - i] = src[i];
-}
+ size_t i;
-static inline void swap56(const u8 src[7], u8 dst[7])
-{
- int i;
- for (i = 0; i < 7; i++)
- dst[6 - i] = src[i];
+ for (i = 0; i < len; i++)
+ dst[len - 1 - i] = src[i];
}
static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
@@ -94,7 +88,7 @@ static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
desc.flags = 0;
/* The most significant octet of key corresponds to k[0] */
- swap128(k, tmp);
+ swap_buf(k, tmp, 16);
err = crypto_blkcipher_setkey(tfm, tmp, 16);
if (err) {
@@ -103,7 +97,7 @@ static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
}
/* Most significant octet of plaintextData corresponds to data[0] */
- swap128(r, data);
+ swap_buf(r, data, 16);
sg_init_one(&sg, data, 16);
@@ -112,7 +106,7 @@ static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
BT_ERR("Encrypt data error %d", err);
/* Most significant octet of encryptedData corresponds to data[0] */
- swap128(data, r);
+ swap_buf(data, r, 16);
return err;
}
--
1.9.3
--
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