| /* This is the maximum truncated ICV length that we know of. */ |
| #define MAX_AH_AUTH_LEN 12 |
| void (*icv)(struct ah_data*, |
| struct sk_buff *skb, u8 *icv); |
| 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); |