Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / include / net / ah.h
1 #ifndef _NET_AH_H
2 #define _NET_AH_H
3
4 #include <linux/crypto.h>
5 #include <net/xfrm.h>
6
7 /* This is the maximum truncated ICV length that we know of. */
8 #define MAX_AH_AUTH_LEN 12
9
10 struct ah_data
11 {
12         u8                      *key;
13         int                     key_len;
14         u8                      *work_icv;
15         int                     icv_full_len;
16         int                     icv_trunc_len;
17
18         struct crypto_hash      *tfm;
19 };
20
21 static inline int ah_mac_digest(struct ah_data *ahp, struct sk_buff *skb,
22                                 u8 *auth_data)
23 {
24         struct hash_desc desc;
25         int err;
26
27         desc.tfm = ahp->tfm;
28         desc.flags = 0;
29
30         memset(auth_data, 0, ahp->icv_trunc_len);
31         err = crypto_hash_init(&desc);
32         if (unlikely(err))
33                 goto out;
34         err = skb_icv_walk(skb, &desc, 0, skb->len, crypto_hash_update);
35         if (unlikely(err))
36                 goto out;
37         err = crypto_hash_final(&desc, ahp->work_icv);
38
39 out:
40         return err;
41 }
42
43 #endif