X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=blobdiff_plain;f=crypto%2Fahash.c;h=b8c59b889c6ea579e7a6bacd7241bbbc86cbe44c;hp=f3476374f764cf18dcf76c806d86fd350569bf1d;hb=3be2264be3c00865116f997dc53ebcc90fe7fc4b;hpb=d315a0e09f1c8b833cacd5e72f3edea419978138

diff --git a/crypto/ahash.c b/crypto/ahash.c
index f347637..b8c59b8 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -24,6 +24,19 @@
 
 #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,
+			    halg);
+}
+
 static int hash_walk_next(struct crypto_hash_walk *walk)
 {
 	unsigned int alignmask = walk->alignmask;
@@ -65,7 +78,6 @@ int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
 	walk->data -= walk->offset;
 
 	if (nbytes && walk->offset & alignmask && !err) {
-		walk->offset += alignmask - 1;
 		walk->offset = ALIGN(walk->offset, alignmask + 1);
 		walk->data += walk->offset;
 
@@ -132,36 +144,34 @@ int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
 				unsigned int keylen)
 {
-	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
 	unsigned long alignmask = crypto_ahash_alignmask(tfm);
 	int ret;
 	u8 *buffer, *alignbuffer;
 	unsigned long absize;
 
 	absize = keylen + alignmask;
-	buffer = kmalloc(absize, GFP_ATOMIC);
+	buffer = kmalloc(absize, GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;
 
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
-	ret = ahash->setkey(tfm, alignbuffer, keylen);
-	memset(alignbuffer, 0, keylen);
-	kfree(buffer);
+	ret = tfm->setkey(tfm, alignbuffer, keylen);
+	kzfree(buffer);
 	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);
 	unsigned long alignmask = crypto_ahash_alignmask(tfm);
 
 	if ((unsigned long)key & alignmask)
 		return ahash_setkey_unaligned(tfm, key, keylen);
 
-	return ahash->setkey(tfm, key, keylen);
+	return tfm->setkey(tfm, key, keylen);
 }
+EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
 
 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
 			  unsigned int keylen)
@@ -169,44 +179,221 @@ static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
 	return -ENOSYS;
 }
 
-int crypto_ahash_import(struct ahash_request *req, const u8 *in)
+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);
-	struct ahash_alg *alg = crypto_ahash_alg(tfm);
+	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_KERNEL : GFP_ATOMIC);
+	if (!priv)
+		return -ENOMEM;
 
-	memcpy(ahash_request_ctx(req), in, crypto_ahash_reqsize(tfm));
+	priv->result = req->result;
+	priv->complete = req->base.complete;
+	priv->data = req->base.data;
 
-	if (alg->reinit)
-		alg->reinit(req);
+	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
+	req->base.complete = ahash_op_unaligned_done;
+	req->base.data = req;
+	req->priv = priv;
 
-	return 0;
+	err = op(req);
+	ahash_op_unaligned_finish(req, err);
+
+	return err;
 }
-EXPORT_SYMBOL_GPL(crypto_ahash_import);
 
-static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type,
-					u32 mask)
+static int crypto_ahash_op(struct ahash_request *req,
+			   int (*op)(struct ahash_request *))
 {
-	return alg->cra_ctxsize;
+	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);
 }
 
-static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+int crypto_ahash_final(struct ahash_request *req)
 {
-	struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
-	struct ahash_tfm *crt   = &tfm->crt_ahash;
+	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_final);
 
-	if (alg->digestsize > PAGE_SIZE / 8)
-		return -EINVAL;
+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)));
 
-	crt->init = alg->init;
-	crt->update = alg->update;
-	crt->final  = alg->final;
-	crt->digest = alg->digest;
-	crt->setkey = alg->setkey ? ahash_setkey : ahash_nosetkey;
-	crt->digestsize = alg->digestsize;
+	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_KERNEL : 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->finup = alg->finup ?: ahash_def_finup;
+	hash->digest = alg->digest;
+
+	if (alg->setkey)
+		hash->setkey = alg->setkey;
+	if (alg->export)
+		hash->export = alg->export;
+	if (alg->import)
+		hash->import = alg->import;
 
 	return 0;
 }
 
+static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
+{
+	if (alg->cra_type == &crypto_ahash_type)
+		return alg->cra_ctxsize;
+
+	return sizeof(struct crypto_shash *);
+}
+
 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
 	__attribute__ ((unused));
 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
@@ -215,17 +402,101 @@ static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
 	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 					     "yes" : "no");
 	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
-	seq_printf(m, "digestsize   : %u\n", alg->cra_ahash.digestsize);
+	seq_printf(m, "digestsize   : %u\n",
+		   __crypto_hash_alg_common(alg)->digestsize);
 }
 
 const struct crypto_type crypto_ahash_type = {
-	.ctxsize = crypto_ahash_ctxsize,
-	.init = crypto_init_ahash_ops,
+	.extsize = crypto_ahash_extsize,
+	.init_tfm = crypto_ahash_init_tfm,
 #ifdef CONFIG_PROC_FS
 	.show = crypto_ahash_show,
 #endif
+	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
+	.type = CRYPTO_ALG_TYPE_AHASH,
+	.tfmsize = offsetof(struct crypto_ahash, base),
 };
 EXPORT_SYMBOL_GPL(crypto_ahash_type);
 
+struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
+					u32 mask)
+{
+	return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
+
+static int ahash_prepare_alg(struct ahash_alg *alg)
+{
+	struct crypto_alg *base = &alg->halg.base;
+
+	if (alg->halg.digestsize > PAGE_SIZE / 8 ||
+	    alg->halg.statesize > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	base->cra_type = &crypto_ahash_type;
+	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+	base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
+
+	return 0;
+}
+
+int crypto_register_ahash(struct ahash_alg *alg)
+{
+	struct crypto_alg *base = &alg->halg.base;
+	int err;
+
+	err = ahash_prepare_alg(alg);
+	if (err)
+		return err;
+
+	return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_ahash);
+
+int crypto_unregister_ahash(struct ahash_alg *alg)
+{
+	return crypto_unregister_alg(&alg->halg.base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
+
+int ahash_register_instance(struct crypto_template *tmpl,
+			    struct ahash_instance *inst)
+{
+	int err;
+
+	err = ahash_prepare_alg(&inst->alg);
+	if (err)
+		return err;
+
+	return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(ahash_register_instance);
+
+void ahash_free_instance(struct crypto_instance *inst)
+{
+	crypto_drop_spawn(crypto_instance_ctx(inst));
+	kfree(ahash_instance(inst));
+}
+EXPORT_SYMBOL_GPL(ahash_free_instance);
+
+int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
+			    struct hash_alg_common *alg,
+			    struct crypto_instance *inst)
+{
+	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
+				  &crypto_ahash_type);
+}
+EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
+
+struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
+{
+	struct crypto_alg *alg;
+
+	alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
+	return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
+}
+EXPORT_SYMBOL_GPL(ahash_attr_alg);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");