crypto: skcipher - Add lskcipher

Add a new API type lskcipher designed for taking straight kernel
pointers instead of SG lists.  Its relationship to skcipher will
be analogous to that between shash and ahash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 58 insertions, 17 deletions

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 7b275716cf4e..b9496dc8a609 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -24,8 +24,9 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <net/netlink.h>
+#include "skcipher.h"
 
-#include "internal.h"
+#define CRYPTO_ALG_TYPE_SKCIPHER_MASK	0x0000000e
 
 enum {
 	SKCIPHER_WALK_PHYS = 1 << 0,
@@ -43,6 +44,8 @@ struct skcipher_walk_buffer {
 	u8 buffer[];
 };
 
+static const struct crypto_type crypto_skcipher_type;
+
 static int skcipher_walk_next(struct skcipher_walk *walk);
 
 static inline void skcipher_map_src(struct skcipher_walk *walk)
@@ -89,11 +92,7 @@ static inline struct skcipher_alg *__crypto_skcipher_alg(
 static inline struct crypto_istat_cipher *skcipher_get_stat(
 	struct skcipher_alg *alg)
 {
-#ifdef CONFIG_CRYPTO_STATS
-	return &alg->stat;
-#else
-	return NULL;
-#endif
+	return skcipher_get_stat_common(&alg->co);
 }
 
 static inline int crypto_skcipher_errstat(struct skcipher_alg *alg, int err)
@@ -468,6 +467,7 @@ static int skcipher_walk_skcipher(struct skcipher_walk *walk,
 				  struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
 
 	walk->total = req->cryptlen;
 	walk->nbytes = 0;
@@ -485,10 +485,14 @@ static int skcipher_walk_skcipher(struct skcipher_walk *walk,
 		       SKCIPHER_WALK_SLEEP : 0;
 
 	walk->blocksize = crypto_skcipher_blocksize(tfm);
-	walk->stride = crypto_skcipher_walksize(tfm);
 	walk->ivsize = crypto_skcipher_ivsize(tfm);
 	walk->alignmask = crypto_skcipher_alignmask(tfm);
 
+	if (alg->co.base.cra_type != &crypto_skcipher_type)
+		walk->stride = alg->co.chunksize;
+	else
+		walk->stride = alg->walksize;
+
 	return skcipher_walk_first(walk);
 }
 
@@ -616,6 +620,11 @@ int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	unsigned long alignmask = crypto_skcipher_alignmask(tfm);
 	int err;
 
+	if (cipher->co.base.cra_type != &crypto_skcipher_type) {
+		err = crypto_lskcipher_setkey_sg(tfm, key, keylen);
+		goto out;
+	}
+
 	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize)
 		return -EINVAL;
 
@@ -624,6 +633,7 @@ int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	else
 		err = cipher->setkey(tfm, key, keylen);
 
+out:
 	if (unlikely(err)) {
 		skcipher_set_needkey(tfm);
 		return err;
@@ -649,6 +659,8 @@ int crypto_skcipher_encrypt(struct skcipher_request *req)
 
 	if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		ret = -ENOKEY;
+	else if (alg->co.base.cra_type != &crypto_skcipher_type)
+		ret = crypto_lskcipher_encrypt_sg(req);
 	else
 		ret = alg->encrypt(req);
 
@@ -671,6 +683,8 @@ int crypto_skcipher_decrypt(struct skcipher_request *req)
 
 	if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		ret = -ENOKEY;
+	else if (alg->co.base.cra_type != &crypto_skcipher_type)
+		ret = crypto_lskcipher_decrypt_sg(req);
 	else
 		ret = alg->decrypt(req);
 
@@ -693,6 +707,9 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
 
 	skcipher_set_needkey(skcipher);
 
+	if (tfm->__crt_alg->cra_type != &crypto_skcipher_type)
+		return crypto_init_lskcipher_ops_sg(tfm);
+
 	if (alg->exit)
 		skcipher->base.exit = crypto_skcipher_exit_tfm;
 
@@ -702,6 +719,14 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
 	return 0;
 }
 
+static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
+{
+	if (alg->cra_type != &crypto_skcipher_type)
+		return sizeof(struct crypto_lskcipher *);
+
+	return crypto_alg_extsize(alg);
+}
+
 static void crypto_skcipher_free_instance(struct crypto_instance *inst)
 {
 	struct skcipher_instance *skcipher =
@@ -770,7 +795,7 @@ static int __maybe_unused crypto_skcipher_report_stat(
 }
 
 static const struct crypto_type crypto_skcipher_type = {
-	.extsize = crypto_alg_extsize,
+	.extsize = crypto_skcipher_extsize,
 	.init_tfm = crypto_skcipher_init_tfm,
 	.free = crypto_skcipher_free_instance,
 #ifdef CONFIG_PROC_FS
@@ -783,7 +808,7 @@ static const struct crypto_type crypto_skcipher_type = {
 	.report_stat = crypto_skcipher_report_stat,
 #endif
 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
-	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK,
 	.type = CRYPTO_ALG_TYPE_SKCIPHER,
 	.tfmsize = offsetof(struct crypto_skcipher, base),
 };
@@ -834,23 +859,18 @@ int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask)
 }
 EXPORT_SYMBOL_GPL(crypto_has_skcipher);
 
-static int skcipher_prepare_alg(struct skcipher_alg *alg)
+int skcipher_prepare_alg_common(struct skcipher_alg_common *alg)
 {
-	struct crypto_istat_cipher *istat = skcipher_get_stat(alg);
+	struct crypto_istat_cipher *istat = skcipher_get_stat_common(alg);
 	struct crypto_alg *base = &alg->base;
 
-	if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
-	    alg->walksize > PAGE_SIZE / 8)
+	if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8)
 		return -EINVAL;
 
 	if (!alg->chunksize)
 		alg->chunksize = base->cra_blocksize;
-	if (!alg->walksize)
-		alg->walksize = alg->chunksize;
 
-	base->cra_type = &crypto_skcipher_type;
 	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
-	base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
 
 	if (IS_ENABLED(CONFIG_CRYPTO_STATS))
 		memset(istat, 0, sizeof(*istat));
@@ -858,6 +878,27 @@ static int skcipher_prepare_alg(struct skcipher_alg *alg)
 	return 0;
 }
 
+static int skcipher_prepare_alg(struct skcipher_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+	int err;
+
+	err = skcipher_prepare_alg_common(&alg->co);
+	if (err)
+		return err;
+
+	if (alg->walksize > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	if (!alg->walksize)
+		alg->walksize = alg->chunksize;
+
+	base->cra_type = &crypto_skcipher_type;
+	base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
+
+	return 0;
+}
+
 int crypto_register_skcipher(struct skcipher_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;