[mirror_ubuntu-focal-kernel.git] / include / net / ah.h

#ifndef _NET_AH_H
#define _NET_AH_H

#include <linux/crypto.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;

	struct crypto_hash	*tfm;
};

static inline int ah_mac_digest(struct ah_data *ahp, struct sk_buff *skb,
				u8 *auth_data)
{
	struct hash_desc desc;
	int err;

	desc.tfm = ahp->tfm;
	desc.flags = 0;

	memset(auth_data, 0, ahp->icv_trunc_len);
	err = crypto_hash_init(&desc);
	if (unlikely(err))
		goto out;
	err = skb_icv_walk(skb, &desc, 0, skb->len, crypto_hash_update);
	if (unlikely(err))
		goto out;
	err = crypto_hash_final(&desc, ahp->work_icv);

out:
	return err;
}

#endif
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	};
1da177e4 LT	20
07d4ee58 HX	21	static inline int ah_mac_digest(struct ah_data ahp, struct sk_buff skb,
07d4ee58 HX	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
1da177e4 LT	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