Creation of Cybook 2416 (actually Gen4) repository

include/net/ah.h

@@ -0,0 +1,43 @@
+#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