[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>

2 files changed, 47 insertions, 30 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 9d4831b..00ffa7b 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -213,7 +213,10 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
 	ah->spi = x->id.spi;
 	ah->seq_no = htonl(++x->replay.oseq);
 	xfrm_aevent_doreplay(x);
-	ahp->icv(ahp, skb, ah->auth_data);
+	err = ah_mac_digest(ahp, skb, ah->auth_data);
+	if (err)
+		goto error_free_iph;
+	memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
 
 	err = 0;
 
@@ -251,6 +254,7 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
 	u16 hdr_len;
 	u16 ah_hlen;
 	int nexthdr;
+	int err = -EINVAL;
 
 	if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
 		goto out;
@@ -292,8 +296,11 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
 		memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
 		memset(ah->auth_data, 0, ahp->icv_trunc_len);
 		skb_push(skb, hdr_len);
-		ahp->icv(ahp, skb, ah->auth_data);
-		if (memcmp(ah->auth_data, auth_data, ahp->icv_trunc_len)) {
+		err = ah_mac_digest(ahp, skb, ah->auth_data);
+		if (err)
+			goto free_out;
+		err = -EINVAL;
+		if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) {
 			LIMIT_NETDEBUG(KERN_WARNING "ipsec ah authentication error\n");
 			x->stats.integrity_failed++;
 			goto free_out;
@@ -310,7 +317,7 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
 free_out:
 	kfree(tmp_hdr);
 out:
-	return -EINVAL;
+	return err;
 }
 
 static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 
@@ -338,6 +345,7 @@ static int ah6_init_state(struct xfrm_state *x)
 {
 	struct ah_data *ahp = NULL;
 	struct xfrm_algo_desc *aalg_desc;
+	struct crypto_hash *tfm;
 
 	if (!x->aalg)
 		goto error;
@@ -355,24 +363,27 @@ static int ah6_init_state(struct xfrm_state *x)
 
 	ahp->key = x->aalg->alg_key;
 	ahp->key_len = (x->aalg->alg_key_len+7)/8;
-	ahp->tfm = crypto_alloc_tfm(x->aalg->alg_name, 0);
-	if (!ahp->tfm)
+	tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(tfm))
+		goto error;
+
+	ahp->tfm = tfm;
+	if (crypto_hash_setkey(tfm, ahp->key, ahp->key_len))
 		goto error;
-	ahp->icv = ah_hmac_digest;
 	
 	/*
 	 * Lookup the algorithm description maintained by xfrm_algo,
 	 * verify crypto transform properties, and store information
 	 * we need for AH processing.  This lookup cannot fail here
-	 * after a successful crypto_alloc_tfm().
+	 * after a successful crypto_alloc_hash().
 	 */
 	aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 	BUG_ON(!aalg_desc);
 
 	if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
-	    crypto_tfm_alg_digestsize(ahp->tfm)) {
+	    crypto_hash_digestsize(tfm)) {
 		printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
-		       x->aalg->alg_name, crypto_tfm_alg_digestsize(ahp->tfm),
+		       x->aalg->alg_name, crypto_hash_digestsize(tfm),
 		       aalg_desc->uinfo.auth.icv_fullbits/8);
 		goto error;
 	}
@@ -396,7 +407,7 @@ static int ah6_init_state(struct xfrm_state *x)
 error:
 	if (ahp) {
 		kfree(ahp->work_icv);
-		crypto_free_tfm(ahp->tfm);
+		crypto_free_hash(ahp->tfm);
 		kfree(ahp);
 	}
 	return -EINVAL;
@@ -411,7 +422,7 @@ static void ah6_destroy(struct xfrm_state *x)
 
 	kfree(ahp->work_icv);
 	ahp->work_icv = NULL;
-	crypto_free_tfm(ahp->tfm);
+	crypto_free_hash(ahp->tfm);
 	ahp->tfm = NULL;
 	kfree(ahp);
 }
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 46a7e68..2ebfd28 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -125,9 +125,9 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 	}
 
 	if (esp->auth.icv_full_len) {
-		esp->auth.icv(esp, skb, (u8*)esph-skb->data,
-			sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen+clen, trailer->tail);
-		pskb_put(skb, trailer, alen);
+		err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
+				     sizeof(*esph) + esp->conf.ivlen + clen);
+		memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
 	}
 
 error:
@@ -162,15 +162,16 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
 
 	/* If integrity check is required, do this. */
         if (esp->auth.icv_full_len) {
-		u8 sum[esp->auth.icv_full_len];
-		u8 sum1[alen];
+		u8 sum[alen];
 
-		esp->auth.icv(esp, skb, 0, skb->len-alen, sum);
+		ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
+		if (ret)
+			goto out;
 
-		if (skb_copy_bits(skb, skb->len-alen, sum1, alen))
+		if (skb_copy_bits(skb, skb->len - alen, sum, alen))
 			BUG();
 
-		if (unlikely(memcmp(sum, sum1, alen))) {
+		if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
 			x->stats.integrity_failed++;
 			ret = -EINVAL;
 			goto out;
@@ -279,7 +280,7 @@ static void esp6_destroy(struct xfrm_state *x)
 	esp->conf.tfm = NULL;
 	kfree(esp->conf.ivec);
 	esp->conf.ivec = NULL;
-	crypto_free_tfm(esp->auth.tfm);
+	crypto_free_hash(esp->auth.tfm);
 	esp->auth.tfm = NULL;
 	kfree(esp->auth.work_icv);
 	esp->auth.work_icv = NULL;
@@ -308,24 +309,29 @@ static int esp6_init_state(struct xfrm_state *x)
 
 	if (x->aalg) {
 		struct xfrm_algo_desc *aalg_desc;
+		struct crypto_hash *hash;
 
 		esp->auth.key = x->aalg->alg_key;
 		esp->auth.key_len = (x->aalg->alg_key_len+7)/8;
-		esp->auth.tfm = crypto_alloc_tfm(x->aalg->alg_name, 0);
-		if (esp->auth.tfm == NULL)
+		hash = crypto_alloc_hash(x->aalg->alg_name, 0,
+					 CRYPTO_ALG_ASYNC);
+		if (IS_ERR(hash))
+			goto error;
+
+		esp->auth.tfm = hash;
+		if (crypto_hash_setkey(hash, esp->auth.key, esp->auth.key_len))
 			goto error;
-		esp->auth.icv = esp_hmac_digest;
  
 		aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 		BUG_ON(!aalg_desc);
  
 		if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
-			crypto_tfm_alg_digestsize(esp->auth.tfm)) {
-				printk(KERN_INFO "ESP: %s digestsize %u != %hu\n",
-					x->aalg->alg_name,
-					crypto_tfm_alg_digestsize(esp->auth.tfm),
-					aalg_desc->uinfo.auth.icv_fullbits/8);
-				goto error;
+		    crypto_hash_digestsize(hash)) {
+			NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
+				 x->aalg->alg_name,
+				 crypto_hash_digestsize(hash),
+				 aalg_desc->uinfo.auth.icv_fullbits/8);
+			goto error;
 		}
  
 		esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;