xref: /openbmc/linux/include/net/ah.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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
44