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- #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
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