[IPSEC]: Use HMAC template and hash interface

This patch converts IPsec to use the new HMAC template.  The names of
existing simple digest algorithms may still be used to refer to their
HMAC composites.

The same structure can be used by other MACs such as AES-XCBC-MAC.

This patch also switches from the digest interface to hash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 12 deletions

diff --git a/include/net/esp.h b/include/net/esp.h
index af2ff18..064366d 100644
--- a/include/net/esp.h
+++ b/include/net/esp.h
@@ -35,7 +35,7 @@ struct esp_data
 		void			(*icv)(struct esp_data*,
 		                               struct sk_buff *skb,
 		                               int offset, int len, u8 *icv);
-		struct crypto_tfm	*tfm;
+		struct crypto_hash	*tfm;
 	} auth;
 };
 
@@ -43,18 +43,22 @@ extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset,
 extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
 extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
 
-static inline void
-esp_hmac_digest(struct esp_data *esp, struct sk_buff *skb, int offset,
-                int len, u8 *auth_data)
+static inline int esp_mac_digest(struct esp_data *esp, struct sk_buff *skb,
+				 int offset, int len)
 {
-	struct crypto_tfm *tfm = esp->auth.tfm;
-	char *icv = esp->auth.work_icv;
-
-	memset(auth_data, 0, esp->auth.icv_trunc_len);
-	crypto_hmac_init(tfm, esp->auth.key, &esp->auth.key_len);
-	skb_icv_walk(skb, tfm, offset, len, crypto_hmac_update);
-	crypto_hmac_final(tfm, esp->auth.key, &esp->auth.key_len, icv);
-	memcpy(auth_data, icv, esp->auth.icv_trunc_len);
+	struct hash_desc desc;
+	int err;
+
+	desc.tfm = esp->auth.tfm;
+	desc.flags = 0;
+
+	err = crypto_hash_init(&desc);
+	if (unlikely(err))
+		return err;
+	err = skb_icv_walk(skb, &desc, offset, len, crypto_hash_update);
+	if (unlikely(err))
+		return err;
+	return crypto_hash_final(&desc, esp->auth.work_icv);
 }
 
 #endif