crypto: ahash - Add unaligned handling and default operations
This patch exports the finup operation where available and adds
a default finup operation for ahash. The operations final, finup
and digest also will now deal with unaligned result pointers by
copying it. Finally export/import operations are will now be
exported too.
Signed-off-by: Herbert Xu <[email protected]>
---
crypto/ahash.c | 204 ++++++++++++++++++++++++++++++++++++++++-
crypto/shash.c | 52 +++++++++-
include/crypto/hash.h | 23 +---
include/crypto/internal/hash.h | 6 +
4 files changed, 263 insertions(+), 22 deletions(-)
diff --git a/crypto/ahash.c b/crypto/ahash.c
index a196055..ac0798d 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -24,6 +24,13 @@
#include "internal.h"
+struct ahash_request_priv {
+ crypto_completion_t complete;
+ void *data;
+ u8 *result;
+ void *ubuf[] CRYPTO_MINALIGN_ATTR;
+};
+
static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
{
return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
@@ -156,7 +163,7 @@ static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
return ret;
}
-static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
+int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
struct ahash_alg *ahash = crypto_ahash_alg(tfm);
@@ -167,6 +174,7 @@ static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
return ahash->setkey(tfm, key, keylen);
}
+EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
@@ -174,19 +182,209 @@ static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
return -ENOSYS;
}
+static inline unsigned int ahash_align_buffer_size(unsigned len,
+ unsigned long mask)
+{
+ return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
+}
+
+static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
+{
+ struct ahash_request_priv *priv = req->priv;
+
+ if (err == -EINPROGRESS)
+ return;
+
+ if (!err)
+ memcpy(priv->result, req->result,
+ crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
+
+ kzfree(priv);
+}
+
+static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
+{
+ struct ahash_request *areq = req->data;
+ struct ahash_request_priv *priv = areq->priv;
+ crypto_completion_t complete = priv->complete;
+ void *data = priv->data;
+
+ ahash_op_unaligned_finish(areq, err);
+
+ complete(data, err);
+}
+
+static int ahash_op_unaligned(struct ahash_request *req,
+ int (*op)(struct ahash_request *))
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ unsigned int ds = crypto_ahash_digestsize(tfm);
+ struct ahash_request_priv *priv;
+ int err;
+
+ priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
+ (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+ GFP_ATOMIC : GFP_ATOMIC);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->result = req->result;
+ priv->complete = req->base.complete;
+ priv->data = req->base.data;
+
+ req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
+ req->base.complete = ahash_op_unaligned_done;
+ req->base.data = req;
+ req->priv = priv;
+
+ err = op(req);
+ ahash_op_unaligned_finish(req, err);
+
+ return err;
+}
+
+static int crypto_ahash_op(struct ahash_request *req,
+ int (*op)(struct ahash_request *))
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+
+ if ((unsigned long)req->result & alignmask)
+ return ahash_op_unaligned(req, op);
+
+ return op(req);
+}
+
+int crypto_ahash_final(struct ahash_request *req)
+{
+ return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_final);
+
+int crypto_ahash_finup(struct ahash_request *req)
+{
+ return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_finup);
+
+int crypto_ahash_digest(struct ahash_request *req)
+{
+ return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_digest);
+
+static void ahash_def_finup_finish2(struct ahash_request *req, int err)
+{
+ struct ahash_request_priv *priv = req->priv;
+
+ if (err == -EINPROGRESS)
+ return;
+
+ if (!err)
+ memcpy(priv->result, req->result,
+ crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
+
+ kzfree(priv);
+}
+
+static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
+{
+ struct ahash_request *areq = req->data;
+ struct ahash_request_priv *priv = areq->priv;
+ crypto_completion_t complete = priv->complete;
+ void *data = priv->data;
+
+ ahash_def_finup_finish2(areq, err);
+
+ complete(data, err);
+}
+
+static int ahash_def_finup_finish1(struct ahash_request *req, int err)
+{
+ if (err)
+ goto out;
+
+ req->base.complete = ahash_def_finup_done2;
+ req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+ err = crypto_ahash_reqtfm(req)->final(req);
+
+out:
+ ahash_def_finup_finish2(req, err);
+ return err;
+}
+
+static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
+{
+ struct ahash_request *areq = req->data;
+ struct ahash_request_priv *priv = areq->priv;
+ crypto_completion_t complete = priv->complete;
+ void *data = priv->data;
+
+ err = ahash_def_finup_finish1(areq, err);
+
+ complete(data, err);
+}
+
+static int ahash_def_finup(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ unsigned int ds = crypto_ahash_digestsize(tfm);
+ struct ahash_request_priv *priv;
+
+ priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
+ (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+ GFP_ATOMIC : GFP_ATOMIC);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->result = req->result;
+ priv->complete = req->base.complete;
+ priv->data = req->base.data;
+
+ req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
+ req->base.complete = ahash_def_finup_done1;
+ req->base.data = req;
+ req->priv = priv;
+
+ return ahash_def_finup_finish1(req, tfm->update(req));
+}
+
+static int ahash_no_export(struct ahash_request *req, void *out)
+{
+ return -ENOSYS;
+}
+
+static int ahash_no_import(struct ahash_request *req, const void *in)
+{
+ return -ENOSYS;
+}
+
static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
struct ahash_alg *alg = crypto_ahash_alg(hash);
+ hash->setkey = ahash_nosetkey;
+ hash->export = ahash_no_export;
+ hash->import = ahash_no_import;
+
if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
return crypto_init_shash_ops_async(tfm);
hash->init = alg->init;
hash->update = alg->update;
- hash->final = alg->final;
+ hash->final = alg->final;
+ hash->finup = alg->finup ?: ahash_def_finup;
hash->digest = alg->digest;
- hash->setkey = alg->setkey ? ahash_setkey : ahash_nosetkey;
+
+ if (alg->setkey)
+ hash->setkey = alg->setkey;
+ if (alg->export)
+ hash->export = alg->export;
+ if (alg->import)
+ hash->import = alg->import;
return 0;
}
diff --git a/crypto/shash.c b/crypto/shash.c
index 171c8f0..834d9d2 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -235,6 +235,33 @@ static int shash_async_final(struct ahash_request *req)
return crypto_shash_final(ahash_request_ctx(req), req->result);
}
+int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
+{
+ struct crypto_hash_walk walk;
+ int nbytes;
+
+ for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
+ nbytes = crypto_hash_walk_done(&walk, nbytes))
+ nbytes = crypto_hash_walk_last(&walk) ?
+ crypto_shash_finup(desc, walk.data, nbytes,
+ req->result) :
+ crypto_shash_update(desc, walk.data, nbytes);
+
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(shash_ahash_finup);
+
+static int shash_async_finup(struct ahash_request *req)
+{
+ struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+ struct shash_desc *desc = ahash_request_ctx(req);
+
+ desc->tfm = *ctx;
+ desc->flags = req->base.flags;
+
+ return shash_ahash_finup(req, desc);
+}
+
int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
{
struct scatterlist *sg = req->src;
@@ -252,8 +279,7 @@ int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
crypto_yield(desc->flags);
} else
err = crypto_shash_init(desc) ?:
- shash_ahash_update(req, desc) ?:
- crypto_shash_final(desc, req->result);
+ shash_ahash_finup(req, desc);
return err;
}
@@ -270,6 +296,16 @@ static int shash_async_digest(struct ahash_request *req)
return shash_ahash_digest(req, desc);
}
+static int shash_async_export(struct ahash_request *req, void *out)
+{
+ return crypto_shash_export(ahash_request_ctx(req), out);
+}
+
+static int shash_async_import(struct ahash_request *req, const void *in)
+{
+ return crypto_shash_import(ahash_request_ctx(req), in);
+}
+
static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
{
struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
@@ -280,6 +316,7 @@ static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
{
struct crypto_alg *calg = tfm->__crt_alg;
+ struct shash_alg *alg = __crypto_shash_alg(calg);
struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
struct crypto_shash *shash;
@@ -298,9 +335,16 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
crt->init = shash_async_init;
crt->update = shash_async_update;
- crt->final = shash_async_final;
+ crt->final = shash_async_final;
+ crt->finup = shash_async_finup;
crt->digest = shash_async_digest;
- crt->setkey = shash_async_setkey;
+
+ if (alg->setkey)
+ crt->setkey = shash_async_setkey;
+ if (alg->export)
+ crt->export = shash_async_export;
+ if (alg->setkey)
+ crt->import = shash_async_import;
crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 45c2bdd..3e89ce1 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -31,6 +31,9 @@ struct ahash_request {
struct scatterlist *src;
u8 *result;
+ /* This field may only be used by the ahash API code. */
+ void *priv;
+
void *__ctx[] CRYPTO_MINALIGN_ATTR;
};
@@ -175,16 +178,11 @@ static inline void *ahash_request_ctx(struct ahash_request *req)
return req->__ctx;
}
-static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
- const u8 *key, unsigned int keylen)
-{
- return tfm->setkey(tfm, key, keylen);
-}
-
-static inline int crypto_ahash_digest(struct ahash_request *req)
-{
- return crypto_ahash_reqtfm(req)->digest(req);
-}
+int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen);
+int crypto_ahash_finup(struct ahash_request *req);
+int crypto_ahash_final(struct ahash_request *req);
+int crypto_ahash_digest(struct ahash_request *req);
static inline int crypto_ahash_export(struct ahash_request *req, void *out)
{
@@ -206,11 +204,6 @@ static inline int crypto_ahash_update(struct ahash_request *req)
return crypto_ahash_reqtfm(req)->update(req);
}
-static inline int crypto_ahash_final(struct ahash_request *req)
-{
- return crypto_ahash_reqtfm(req)->final(req);
-}
-
static inline void ahash_request_set_tfm(struct ahash_request *req,
struct crypto_ahash *tfm)
{
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 179dd8f..5bfad8c 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -59,6 +59,11 @@ int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
struct crypto_hash_walk *walk,
struct scatterlist *sg, unsigned int len);
+static inline int crypto_hash_walk_last(struct crypto_hash_walk *walk)
+{
+ return !(walk->entrylen | walk->total);
+}
+
int crypto_register_ahash(struct ahash_alg *alg);
int crypto_unregister_ahash(struct ahash_alg *alg);
int ahash_register_instance(struct crypto_template *tmpl,
@@ -94,6 +99,7 @@ static inline void crypto_drop_shash(struct crypto_shash_spawn *spawn)
struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask);
int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc);
+int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc);
int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc);
int crypto_init_shash_ops_async(struct crypto_tfm *tfm);