linux/include/net/ah.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

36 lines
793 B
C

#ifndef _NET_AH_H
#define _NET_AH_H
#include <net/xfrm.h>
/* This is the maximum truncated ICV length that we know of. */
#define MAX_AH_AUTH_LEN 12
struct ah_data
{
u8 *key;
int key_len;
u8 *work_icv;
int icv_full_len;
int icv_trunc_len;
void (*icv)(struct ah_data*,
struct sk_buff *skb, u8 *icv);
struct crypto_tfm *tfm;
};
static inline void
ah_hmac_digest(struct ah_data *ahp, struct sk_buff *skb, u8 *auth_data)
{
struct crypto_tfm *tfm = ahp->tfm;
memset(auth_data, 0, ahp->icv_trunc_len);
crypto_hmac_init(tfm, ahp->key, &ahp->key_len);
skb_icv_walk(skb, tfm, 0, skb->len, crypto_hmac_update);
crypto_hmac_final(tfm, ahp->key, &ahp->key_len, ahp->work_icv);
memcpy(auth_data, ahp->work_icv, ahp->icv_trunc_len);
}
#endif