4 #include <linux/crypto.h>
7 /* This is the maximum truncated ICV length that we know of. */
8 #define MAX_AH_AUTH_LEN 12
16 struct crypto_hash *tfm;
17 struct crypto_ahash *ahash;
20 static inline int ah_mac_digest(struct ah_data *ahp, struct sk_buff *skb,
23 struct hash_desc desc;
29 memset(auth_data, 0, ahp->icv_trunc_len);
30 err = crypto_hash_init(&desc);
33 err = skb_icv_walk(skb, &desc, 0, skb->len, crypto_hash_update);
36 err = crypto_hash_final(&desc, ahp->work_icv);
44 static inline struct ip_auth_hdr *ip_auth_hdr(const struct sk_buff *skb)
46 return (struct ip_auth_hdr *)skb_transport_header(skb);