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-rw-r--r--include/net/ah.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/include/net/ah.h b/include/net/ah.h
new file mode 100644
index 000000000000..ceff00afae09
--- /dev/null
+++ b/include/net/ah.h
@@ -0,0 +1,35 @@
+#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