projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef _NET_AH_H |
| 2 | #define _NET_AH_H | |
| 3 | ||
| 9409f38a | 4 | #include <linux/crypto.h> |
| 1da177e4 LT |
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 | ||
| 07d4ee58 | 18 | struct crypto_hash *tfm; |
| 1da177e4 LT |
19 | }; |
| 20 | ||
| 07d4ee58 HX |
21 | static inline int ah_mac_digest(struct ah_data *ahp, struct sk_buff *skb, |
| 22 | u8 *auth_data) | |
| 1da177e4 | 23 | { |
| 07d4ee58 HX |
24 | struct hash_desc desc; |
| 25 | int err; | |
| 26 | ||
| 27 | desc.tfm = ahp->tfm; | |
| 28 | desc.flags = 0; | |
| 1da177e4 LT |
29 | |
| 30 | memset(auth_data, 0, ahp->icv_trunc_len); | |
| 07d4ee58 HX |
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; | |
| 1da177e4 LT |
41 | } |
| 42 | ||
| 43 | #endif |