#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