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36 lines
793 B
C
36 lines
793 B
C
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#ifndef _NET_AH_H
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#define _NET_AH_H
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#include <net/xfrm.h>
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/* This is the maximum truncated ICV length that we know of. */
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#define MAX_AH_AUTH_LEN 12
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struct ah_data
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{
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u8 *key;
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int key_len;
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u8 *work_icv;
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int icv_full_len;
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int icv_trunc_len;
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void (*icv)(struct ah_data*,
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struct sk_buff *skb, u8 *icv);
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struct crypto_tfm *tfm;
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};
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static inline void
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ah_hmac_digest(struct ah_data *ahp, struct sk_buff *skb, u8 *auth_data)
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{
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struct crypto_tfm *tfm = ahp->tfm;
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memset(auth_data, 0, ahp->icv_trunc_len);
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crypto_hmac_init(tfm, ahp->key, &ahp->key_len);
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skb_icv_walk(skb, tfm, 0, skb->len, crypto_hmac_update);
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crypto_hmac_final(tfm, ahp->key, &ahp->key_len, ahp->work_icv);
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memcpy(auth_data, ahp->work_icv, ahp->icv_trunc_len);
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}
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#endif
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