Re: [PATCH 17/26] mac802154: Use skcipher

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Hello.

On 24/01/16 14:18, Herbert Xu wrote:
This patch replaces uses of blkcipher with skcipher.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---

  net/mac802154/llsec.c |   41 +++++++++++++++++++++++------------------
  net/mac802154/llsec.h |    3 +--
  2 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/net/mac802154/llsec.c b/net/mac802154/llsec.c
index a13d02b..6a3e1c2 100644
--- a/net/mac802154/llsec.c
+++ b/net/mac802154/llsec.c
@@ -17,9 +17,9 @@
  #include <linux/err.h>
  #include <linux/bug.h>
  #include <linux/completion.h>
-#include <linux/crypto.h>
  #include <linux/ieee802154.h>
  #include <crypto/aead.h>
+#include <crypto/skcipher.h>
#include "ieee802154_i.h"
  #include "llsec.h"
@@ -144,18 +144,18 @@ llsec_key_alloc(const struct ieee802154_llsec_key *template)
  			goto err_tfm;
  	}
- key->tfm0 = crypto_alloc_blkcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC);
+	key->tfm0 = crypto_alloc_skcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC);
  	if (IS_ERR(key->tfm0))
  		goto err_tfm;
- if (crypto_blkcipher_setkey(key->tfm0, template->key,
-				    IEEE802154_LLSEC_KEY_SIZE))
+	if (crypto_skcipher_setkey(key->tfm0, template->key,
+				   IEEE802154_LLSEC_KEY_SIZE))
  		goto err_tfm0;
return key; err_tfm0:
-	crypto_free_blkcipher(key->tfm0);
+	crypto_free_skcipher(key->tfm0);
  err_tfm:
  	for (i = 0; i < ARRAY_SIZE(key->tfm); i++)
  		if (key->tfm[i])
@@ -175,7 +175,7 @@ static void llsec_key_release(struct kref *ref)
  	for (i = 0; i < ARRAY_SIZE(key->tfm); i++)
  		crypto_free_aead(key->tfm[i]);
- crypto_free_blkcipher(key->tfm0);
+	crypto_free_skcipher(key->tfm0);
  	kzfree(key);
  }
@@ -620,15 +620,17 @@ llsec_do_encrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec,
  {
  	u8 iv[16];
  	struct scatterlist src;
-	struct blkcipher_desc req = {
-		.tfm = key->tfm0,
-		.info = iv,
-		.flags = 0,
-	};
+	SKCIPHER_REQUEST_ON_STACK(req, key->tfm0);
+	int err;
llsec_geniv(iv, sec->params.hwaddr, &hdr->sec);
  	sg_init_one(&src, skb->data, skb->len);
-	return crypto_blkcipher_encrypt_iv(&req, &src, &src, skb->len);
+	skcipher_request_set_tfm(req, key->tfm0);
+	skcipher_request_set_callback(req, 0, NULL, NULL);
+	skcipher_request_set_crypt(req, &src, &src, skb->len, iv);
+	err = crypto_skcipher_encrypt(req);
+	skcipher_request_zero(req);
+	return err;
  }
static struct crypto_aead*
@@ -830,11 +832,8 @@ llsec_do_decrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec,
  	unsigned char *data;
  	int datalen;
  	struct scatterlist src;
-	struct blkcipher_desc req = {
-		.tfm = key->tfm0,
-		.info = iv,
-		.flags = 0,
-	};
+	SKCIPHER_REQUEST_ON_STACK(req, key->tfm0);
+	int err;
llsec_geniv(iv, dev_addr, &hdr->sec);
  	data = skb_mac_header(skb) + skb->mac_len;
@@ -842,7 +841,13 @@ llsec_do_decrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec,
sg_init_one(&src, data, datalen); - return crypto_blkcipher_decrypt_iv(&req, &src, &src, datalen);
+	skcipher_request_set_tfm(req, key->tfm0);
+	skcipher_request_set_callback(req, 0, NULL, NULL);
+	skcipher_request_set_crypt(req, &src, &src, datalen, iv);
+
+	err = crypto_skcipher_decrypt(req);
+	skcipher_request_zero(req);
+	return err;
  }
static int
diff --git a/net/mac802154/llsec.h b/net/mac802154/llsec.h
index 950578e..6f3b658 100644
--- a/net/mac802154/llsec.h
+++ b/net/mac802154/llsec.h
@@ -19,7 +19,6 @@
#include <linux/slab.h>
  #include <linux/hashtable.h>
-#include <linux/crypto.h>
  #include <linux/kref.h>
  #include <linux/spinlock.h>
  #include <net/af_ieee802154.h>
@@ -30,7 +29,7 @@ struct mac802154_llsec_key {
/* one tfm for each authsize (4/8/16) */
  	struct crypto_aead *tfm[3];
-	struct crypto_blkcipher *tfm0;
+	struct crypto_skcipher *tfm0;
struct kref ref;
  };

Reviewed-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxx>

regards
Stefan Schmidt

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