#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