linux-kernel - [RFC PATCH crypto 3/4] AES-NI: Make it possible to use blkcipher

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Date:	Mon, 05 Jan 2009 10:02:21 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	Sebastian Siewior <linux-crypto@...breakpoint.cc>
Cc:	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: [RFC PATCH crypto 3/4] AES-NI: Make it possible to use
	blkcipher_walk for ablkcipher algorithm

Current blkcipher_walk can be used for ablkcipher crypto_tfm +
blkcipher crypto_alg. This patch make it possible to use
blkcipher_walk for ablkcipher algorithm. The only field in
cra_blkcipher used is ivsize, which is wrapped in a function to
support both cra_blkcipher and cra_ablkcipher.

Signed-off-by: Huang Ying <ying.huang@...el.com>

---
 crypto/blkcipher.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -68,6 +68,16 @@ static inline u8 *blkcipher_get_spot(u8 
 	return max(start, end_page);
 }
 
+static inline unsigned int blkcipher_walk_ivsize(struct crypto_blkcipher *tfm)
+{
+	struct crypto_tfm *tfm_base = crypto_blkcipher_tfm(tfm);
+
+	if (crypto_tfm_alg_type(tfm_base) == CRYPTO_ALG_TYPE_ABLKCIPHER)
+		return tfm_base->__crt_alg->cra_ablkcipher.ivsize;
+	else
+		return crypto_blkcipher_ivsize(tfm);
+}
+
 static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm,
 					       struct blkcipher_walk *walk,
 					       unsigned int bsize)
@@ -134,7 +144,7 @@ int blkcipher_walk_done(struct blkcipher
 
 err:
 	if (walk->iv != desc->info)
-		memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
+		memcpy(desc->info, walk->iv, blkcipher_walk_ivsize(tfm));
 	if (walk->buffer != walk->page)
 		kfree(walk->buffer);
 	if (walk->page)
@@ -280,7 +290,7 @@ static inline int blkcipher_copy_iv(stru
 				    unsigned int alignmask)
 {
 	unsigned bs = walk->blocksize;
-	unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
+	unsigned int ivsize = blkcipher_walk_ivsize(tfm);
 	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
 	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
 			    (alignmask + 1);


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