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 <herbert@gondor.apana.org.au>
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 @@
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 @@
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 @@
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;
}
