tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _NET_AH_H
2#define _NET_AH_H
3
4#include <net/xfrm.h>
5
6/* This is the maximum truncated ICV length that we know of. */
7#define MAX_AH_AUTH_LEN 12
8
9struct ah_data
10{
11 u8 *key;
12 int key_len;
13 u8 *work_icv;
14 int icv_full_len;
15 int icv_trunc_len;
16
17 void (*icv)(struct ah_data*,
18 struct sk_buff *skb, u8 *icv);
19
20 struct crypto_tfm *tfm;
21};
22
23static inline void
24ah_hmac_digest(struct ah_data *ahp, struct sk_buff *skb, u8 *auth_data)
25{
26 struct crypto_tfm *tfm = ahp->tfm;
27
28 memset(auth_data, 0, ahp->icv_trunc_len);
29 crypto_hmac_init(tfm, ahp->key, &ahp->key_len);
30 skb_icv_walk(skb, tfm, 0, skb->len, crypto_hmac_update);
31 crypto_hmac_final(tfm, ahp->key, &ahp->key_len, ahp->work_icv);
32 memcpy(auth_data, ahp->work_icv, ahp->icv_trunc_len);
33}
34
35#endif