1 files changed, 673 insertions, 0 deletions

diff --git a/crypto/ahash.c b/crypto/ahash.c
new file mode 100644
index 000000000..158e716f2
--- /dev/null
+++ b/crypto/ahash.c
@@ -0,0 +1,673 @@
+/*
+ * Asynchronous Cryptographic Hash operations.
+ *
+ * This is the asynchronous version of hash.c with notification of
+ * completion via a callback.
+ *
+ * Copyright (c) 2008 Loc Ho <lho@amcc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/scatterwalk.h>
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/cryptouser.h>
+#include <linux/compiler.h>
+#include <net/netlink.h>
+
+#include "internal.h"
+
+struct ahash_request_priv {
+	crypto_completion_t complete;
+	void *data;
+	u8 *result;
+	u32 flags;
+	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;
+	unsigned int offset = walk->offset;
+	unsigned int nbytes = min(walk->entrylen,
+				  ((unsigned int)(PAGE_SIZE)) - offset);
+
+	if (walk->flags & CRYPTO_ALG_ASYNC)
+		walk->data = kmap(walk->pg);
+	else
+		walk->data = kmap_atomic(walk->pg);
+	walk->data += offset;
+
+	if (offset & alignmask) {
+		unsigned int unaligned = alignmask + 1 - (offset & alignmask);
+
+		if (nbytes > unaligned)
+			nbytes = unaligned;
+	}
+
+	walk->entrylen -= nbytes;
+	return nbytes;
+}
+
+static int hash_walk_new_entry(struct crypto_hash_walk *walk)
+{
+	struct scatterlist *sg;
+
+	sg = walk->sg;
+	walk->offset = sg->offset;
+	walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
+	walk->offset = offset_in_page(walk->offset);
+	walk->entrylen = sg->length;
+
+	if (walk->entrylen > walk->total)
+		walk->entrylen = walk->total;
+	walk->total -= walk->entrylen;
+
+	return hash_walk_next(walk);
+}
+
+int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
+{
+	unsigned int alignmask = walk->alignmask;
+
+	walk->data -= walk->offset;
+
+	if (walk->entrylen && (walk->offset & alignmask) && !err) {
+		unsigned int nbytes;
+
+		walk->offset = ALIGN(walk->offset, alignmask + 1);
+		nbytes = min(walk->entrylen,
+			     (unsigned int)(PAGE_SIZE - walk->offset));
+		if (nbytes) {
+			walk->entrylen -= nbytes;
+			walk->data += walk->offset;
+			return nbytes;
+		}
+	}
+
+	if (walk->flags & CRYPTO_ALG_ASYNC)
+		kunmap(walk->pg);
+	else {
+		kunmap_atomic(walk->data);
+		/*
+		 * The may sleep test only makes sense for sync users.
+		 * Async users don't need to sleep here anyway.
+		 */
+		crypto_yield(walk->flags);
+	}
+
+	if (err)
+		return err;
+
+	if (walk->entrylen) {
+		walk->offset = 0;
+		walk->pg++;
+		return hash_walk_next(walk);
+	}
+
+	if (!walk->total)
+		return 0;
+
+	walk->sg = sg_next(walk->sg);
+
+	return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
+
+int crypto_hash_walk_first(struct ahash_request *req,
+			   struct crypto_hash_walk *walk)
+{
+	walk->total = req->nbytes;
+
+	if (!walk->total) {
+		walk->entrylen = 0;
+		return 0;
+	}
+
+	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
+	walk->sg = req->src;
+	walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
+
+	return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
+
+int crypto_ahash_walk_first(struct ahash_request *req,
+			    struct crypto_hash_walk *walk)
+{
+	walk->total = req->nbytes;
+
+	if (!walk->total) {
+		walk->entrylen = 0;
+		return 0;
+	}
+
+	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
+	walk->sg = req->src;
+	walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
+	walk->flags |= CRYPTO_ALG_ASYNC;
+
+	BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
+
+	return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
+
+static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
+				unsigned int keylen)
+{
+	unsigned long alignmask = crypto_ahash_alignmask(tfm);
+	int ret;
+	u8 *buffer, *alignbuffer;
+	unsigned long absize;
+
+	absize = keylen + alignmask;
+	buffer = kmalloc(absize, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+	memcpy(alignbuffer, key, keylen);
+	ret = tfm->setkey(tfm, alignbuffer, keylen);
+	kzfree(buffer);
+	return ret;
+}
+
+static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
+			  unsigned int keylen)
+{
+	return -ENOSYS;
+}
+
+static void ahash_set_needkey(struct crypto_ahash *tfm)
+{
+	const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
+
+	if (tfm->setkey != ahash_nosetkey &&
+	    !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
+		crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
+}
+
+int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
+			unsigned int keylen)
+{
+	unsigned long alignmask = crypto_ahash_alignmask(tfm);
+	int err;
+
+	if ((unsigned long)key & alignmask)
+		err = ahash_setkey_unaligned(tfm, key, keylen);
+	else
+		err = tfm->setkey(tfm, key, keylen);
+
+	if (unlikely(err)) {
+		ahash_set_needkey(tfm);
+		return err;
+	}
+
+	crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
+
+static inline unsigned int ahash_align_buffer_size(unsigned len,
+						   unsigned long mask)
+{
+	return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
+}
+
+static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
+{
+	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;
+
+	/*
+	 * WARNING: Voodoo programming below!
+	 *
+	 * The code below is obscure and hard to understand, thus explanation
+	 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
+	 * to understand the layout of structures used here!
+	 *
+	 * The code here will replace portions of the ORIGINAL request with
+	 * pointers to new code and buffers so the hashing operation can store
+	 * the result in aligned buffer. We will call the modified request
+	 * an ADJUSTED request.
+	 *
+	 * The newly mangled request will look as such:
+	 *
+	 * req {
+	 *   .result        = ADJUSTED[new aligned buffer]
+	 *   .base.complete = ADJUSTED[pointer to completion function]
+	 *   .base.data     = ADJUSTED[*req (pointer to self)]
+	 *   .priv          = ADJUSTED[new priv] {
+	 *           .result   = ORIGINAL(result)
+	 *           .complete = ORIGINAL(base.complete)
+	 *           .data     = ORIGINAL(base.data)
+	 *   }
+	 */
+
+	priv->result = req->result;
+	priv->complete = req->base.complete;
+	priv->data = req->base.data;
+	priv->flags = req->base.flags;
+
+	/*
+	 * WARNING: We do not backup req->priv here! The req->priv
+	 *          is for internal use of the Crypto API and the
+	 *          user must _NOT_ _EVER_ depend on it's content!
+	 */
+
+	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
+	req->base.complete = cplt;
+	req->base.data = req;
+	req->priv = priv;
+
+	return 0;
+}
+
+static void ahash_restore_req(struct ahash_request *req, int err)
+{
+	struct ahash_request_priv *priv = req->priv;
+
+	if (!err)
+		memcpy(priv->result, req->result,
+		       crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
+
+	/* Restore the original crypto request. */
+	req->result = priv->result;
+
+	ahash_request_set_callback(req, priv->flags,
+				   priv->complete, priv->data);
+	req->priv = NULL;
+
+	/* Free the req->priv.priv from the ADJUSTED request. */
+	kzfree(priv);
+}
+
+static void ahash_notify_einprogress(struct ahash_request *req)
+{
+	struct ahash_request_priv *priv = req->priv;
+	struct crypto_async_request oreq;
+
+	oreq.data = priv->data;
+
+	priv->complete(&oreq, -EINPROGRESS);
+}
+
+static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
+{
+	struct ahash_request *areq = req->data;
+
+	if (err == -EINPROGRESS) {
+		ahash_notify_einprogress(areq);
+		return;
+	}
+
+	/*
+	 * Restore the original request, see ahash_op_unaligned() for what
+	 * goes where.
+	 *
+	 * The "struct ahash_request *req" here is in fact the "req.base"
+	 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
+	 * is a pointer to self, it is also the ADJUSTED "req" .
+	 */
+
+	/* First copy req->result into req->priv.result */
+	ahash_restore_req(areq, err);
+
+	/* Complete the ORIGINAL request. */
+	areq->base.complete(&areq->base, err);
+}
+
+static int ahash_op_unaligned(struct ahash_request *req,
+			      int (*op)(struct ahash_request *))
+{
+	int err;
+
+	err = ahash_save_req(req, ahash_op_unaligned_done);
+	if (err)
+		return err;
+
+	err = op(req);
+	if (err == -EINPROGRESS || err == -EBUSY)
+		return err;
+
+	ahash_restore_req(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)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+
+	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+		return -ENOKEY;
+
+	return crypto_ahash_op(req, tfm->digest);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_digest);
+
+static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
+{
+	struct ahash_request *areq = req->data;
+
+	if (err == -EINPROGRESS)
+		return;
+
+	ahash_restore_req(areq, err);
+
+	areq->base.complete(&areq->base, err);
+}
+
+static int ahash_def_finup_finish1(struct ahash_request *req, int err)
+{
+	if (err)
+		goto out;
+
+	req->base.complete = ahash_def_finup_done2;
+
+	err = crypto_ahash_reqtfm(req)->final(req);
+	if (err == -EINPROGRESS || err == -EBUSY)
+		return err;
+
+out:
+	ahash_restore_req(req, err);
+	return err;
+}
+
+static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
+{
+	struct ahash_request *areq = req->data;
+
+	if (err == -EINPROGRESS) {
+		ahash_notify_einprogress(areq);
+		return;
+	}
+
+	areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	err = ahash_def_finup_finish1(areq, err);
+	if (areq->priv)
+		return;
+
+	areq->base.complete(&areq->base, err);
+}
+
+static int ahash_def_finup(struct ahash_request *req)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	int err;
+
+	err = ahash_save_req(req, ahash_def_finup_done1);
+	if (err)
+		return err;
+
+	err = tfm->update(req);
+	if (err == -EINPROGRESS || err == -EBUSY)
+		return err;
+
+	return ahash_def_finup_finish1(req, err);
+}
+
+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;
+
+	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;
+	hash->export = alg->export;
+	hash->import = alg->import;
+
+	if (alg->setkey) {
+		hash->setkey = alg->setkey;
+		ahash_set_needkey(hash);
+	}
+
+	return 0;
+}
+
+static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
+{
+	if (alg->cra_type != &crypto_ahash_type)
+		return sizeof(struct crypto_shash *);
+
+	return crypto_alg_extsize(alg);
+}
+
+#ifdef CONFIG_NET
+static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	struct crypto_report_hash rhash;
+
+	strncpy(rhash.type, "ahash", sizeof(rhash.type));
+
+	rhash.blocksize = alg->cra_blocksize;
+	rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
+
+	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
+		    sizeof(struct crypto_report_hash), &rhash))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+#else
+static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	return -ENOSYS;
+}
+#endif
+
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+	__maybe_unused;
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	seq_printf(m, "type         : ahash\n");
+	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",
+		   __crypto_hash_alg_common(alg)->digestsize);
+}
+
+const struct crypto_type crypto_ahash_type = {
+	.extsize = crypto_ahash_extsize,
+	.init_tfm = crypto_ahash_init_tfm,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_ahash_show,
+#endif
+	.report = crypto_ahash_report,
+	.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);
+
+int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
+{
+	return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_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 ||
+	    alg->halg.statesize == 0)
+		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 crypto_register_ahashes(struct ahash_alg *algs, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		ret = crypto_register_ahash(&algs[i]);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	for (--i; i >= 0; --i)
+		crypto_unregister_ahash(&algs[i]);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_ahashes);
+
+void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
+{
+	int i;
+
+	for (i = count - 1; i >= 0; --i)
+		crypto_unregister_ahash(&algs[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
+
+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);
+
+bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
+{
+	struct crypto_alg *alg = &halg->base;
+
+	if (alg->cra_type != &crypto_ahash_type)
+		return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
+
+	return __crypto_ahash_alg(alg)->setkey != NULL;
+}
+EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Asynchronous cryptographic hash type");