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- #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
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