[linux.git] / crypto / ahash.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Asynchronous Cryptographic Hash operations.
 *
 * This is the asynchronous version of hash.c with notification of
 * completion via a callback.
 *
 * Copyright (c) 2008 Loc Ho <[email protected]>
 */

#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.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"

static const struct crypto_type crypto_ahash_type;

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);

	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;
		}
	}

	kunmap_atomic(walk->data);
	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;

	return hash_walk_new_entry(walk);
}
EXPORT_SYMBOL_GPL(crypto_hash_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);
	kfree_sensitive(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. */
	kfree_sensitive(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)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct crypto_alg *alg = tfm->base.__crt_alg;
	unsigned int nbytes = req->nbytes;
	int ret;

	crypto_stats_get(alg);
	ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
	crypto_stats_ahash_final(nbytes, ret, alg);
	return ret;
}
EXPORT_SYMBOL_GPL(crypto_ahash_final);

int crypto_ahash_finup(struct ahash_request *req)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct crypto_alg *alg = tfm->base.__crt_alg;
	unsigned int nbytes = req->nbytes;
	int ret;

	crypto_stats_get(alg);
	ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
	crypto_stats_ahash_final(nbytes, ret, alg);
	return ret;
}
EXPORT_SYMBOL_GPL(crypto_ahash_finup);

int crypto_ahash_digest(struct ahash_request *req)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct crypto_alg *alg = tfm->base.__crt_alg;
	unsigned int nbytes = req->nbytes;
	int ret;

	crypto_stats_get(alg);
	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
		ret = -ENOKEY;
	else
		ret = crypto_ahash_op(req, tfm->digest);
	crypto_stats_ahash_final(nbytes, ret, alg);
	return ret;
}
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 void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	struct ahash_alg *alg = crypto_ahash_alg(hash);

	alg->exit_tfm(hash);
}

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);
	}

	if (alg->exit_tfm)
		tfm->exit = crypto_ahash_exit_tfm;

	return alg->init_tfm ? alg->init_tfm(hash) : 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);
}

static void crypto_ahash_free_instance(struct crypto_instance *inst)
{
	struct ahash_instance *ahash = ahash_instance(inst);

	ahash->free(ahash);
}

#ifdef CONFIG_NET
static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_hash rhash;

	memset(&rhash, 0, sizeof(rhash));

	strscpy(rhash.type, "ahash", sizeof(rhash.type));

	rhash.blocksize = alg->cra_blocksize;
	rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;

	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
}
#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);
}

static const struct crypto_type crypto_ahash_type = {
	.extsize = crypto_ahash_extsize,
	.init_tfm = crypto_ahash_init_tfm,
	.free = crypto_ahash_free_instance,
#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),
};

int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
		      struct crypto_instance *inst,
		      const char *name, u32 type, u32 mask)
{
	spawn->base.frontend = &crypto_ahash_type;
	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_ahash);

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 > HASH_MAX_DIGESTSIZE ||
	    alg->halg.statesize > HASH_MAX_STATESIZE ||
	    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);

void crypto_unregister_ahash(struct ahash_alg *alg)
{
	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;

	if (WARN_ON(!inst->free))
		return -EINVAL;

	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);

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");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
004a403c LH	2	/*
	3	* Asynchronous Cryptographic Hash operations.
	4	*
	5	* This is the asynchronous version of hash.c with notification of
	6	* completion via a callback.
	7	*
	8	* Copyright (c) 2008 Loc Ho <[email protected]>
004a403c LH	9	*/
004a403c LH	10
20036252 HX	11	#include <crypto/internal/hash.h>
20036252 HX	12	#include <crypto/scatterwalk.h>
004a403c LH	13	#include <linux/err.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/sched.h>
	17	#include <linux/slab.h>
	18	#include <linux/seq_file.h>
6238cbae	19	#include <linux/cryptouser.h>
d8c34b94	20	#include <linux/compiler.h>
6238cbae	21	#include <net/netlink.h>
004a403c LH	22
	23	#include "internal.h"
	24
6d1b41fc EB	25	static const struct crypto_type crypto_ahash_type;
6d1b41fc EB	26
66f6ce5e HX	27	struct ahash_request_priv {
	28	crypto_completion_t complete;
	29	void *data;
	30	u8 *result;
ef0579b6	31	u32 flags;
66f6ce5e HX	32	void *ubuf[] CRYPTO_MINALIGN_ATTR;
	33	};
	34
88056ec3 HX	35	static inline struct ahash_alg crypto_ahash_alg(struct crypto_ahash hash)
	36	{
	37	return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
	38	halg);
	39	}
	40
20036252 HX	41	static int hash_walk_next(struct crypto_hash_walk *walk)
	42	{
	43	unsigned int alignmask = walk->alignmask;
	44	unsigned int offset = walk->offset;
	45	unsigned int nbytes = min(walk->entrylen,
	46	((unsigned int)(PAGE_SIZE)) - offset);
	47
8afa25aa	48	walk->data = kmap_atomic(walk->pg);
20036252 HX	49	walk->data += offset;
20036252 HX	50
23a75eee SÖ	51	if (offset & alignmask) {
23a75eee SÖ	52	unsigned int unaligned = alignmask + 1 - (offset & alignmask);
b516d514	53
23a75eee SÖ	54	if (nbytes > unaligned)
	55	nbytes = unaligned;
	56	}
20036252 HX	57
	58	walk->entrylen -= nbytes;
	59	return nbytes;
	60	}
	61
	62	static int hash_walk_new_entry(struct crypto_hash_walk *walk)
	63	{
	64	struct scatterlist *sg;
	65
	66	sg = walk->sg;
20036252	67	walk->offset = sg->offset;
13f4bb78 HX	68	walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
13f4bb78 HX	69	walk->offset = offset_in_page(walk->offset);
20036252 HX	70	walk->entrylen = sg->length;
	71
	72	if (walk->entrylen > walk->total)
	73	walk->entrylen = walk->total;
	74	walk->total -= walk->entrylen;
	75
	76	return hash_walk_next(walk);
	77	}
	78
	79	int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
	80	{
	81	unsigned int alignmask = walk->alignmask;
20036252 HX	82
	83	walk->data -= walk->offset;
	84
77568e53 EB	85	if (walk->entrylen && (walk->offset & alignmask) && !err) {
77568e53 EB	86	unsigned int nbytes;
20036252	87
77568e53 EB	88	walk->offset = ALIGN(walk->offset, alignmask + 1);
	89	nbytes = min(walk->entrylen,
	90	(unsigned int)(PAGE_SIZE - walk->offset));
900a081f	91	if (nbytes) {
77568e53	92	walk->entrylen -= nbytes;
900a081f HX	93	walk->data += walk->offset;
	94	return nbytes;
	95	}
20036252 HX	96	}
20036252 HX	97
8afa25aa IW	98	kunmap_atomic(walk->data);
8afa25aa IW	99	crypto_yield(walk->flags);
20036252 HX	100
	101	if (err)
	102	return err;
	103
77568e53	104	if (walk->entrylen) {
d315a0e0 HX	105	walk->offset = 0;
d315a0e0 HX	106	walk->pg++;
20036252	107	return hash_walk_next(walk);
d315a0e0	108	}
20036252 HX	109
	110	if (!walk->total)
	111	return 0;
	112
5be4d4c9	113	walk->sg = sg_next(walk->sg);
20036252 HX	114
	115	return hash_walk_new_entry(walk);
	116	}
	117	EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
	118
	119	int crypto_hash_walk_first(struct ahash_request *req,
	120	struct crypto_hash_walk *walk)
	121	{
	122	walk->total = req->nbytes;
	123
6d9529c5 TC	124	if (!walk->total) {
6d9529c5 TC	125	walk->entrylen = 0;
20036252	126	return 0;
6d9529c5	127	}
20036252 HX	128
	129	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
	130	walk->sg = req->src;
8afa25aa	131	walk->flags = req->base.flags;
20036252 HX	132
	133	return hash_walk_new_entry(walk);
	134	}
	135	EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
	136
004a403c LH	137	static int ahash_setkey_unaligned(struct crypto_ahash tfm, const u8 key,
	138	unsigned int keylen)
	139	{
004a403c LH	140	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	141	int ret;
	142	u8 buffer, alignbuffer;
	143	unsigned long absize;
	144
	145	absize = keylen + alignmask;
093900c2	146	buffer = kmalloc(absize, GFP_KERNEL);
004a403c LH	147	if (!buffer)
	148	return -ENOMEM;
	149
	150	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	151	memcpy(alignbuffer, key, keylen);
a70c5225	152	ret = tfm->setkey(tfm, alignbuffer, keylen);
453431a5	153	kfree_sensitive(buffer);
004a403c LH	154	return ret;
	155	}
	156
ba7d7433 EB	157	static int ahash_nosetkey(struct crypto_ahash tfm, const u8 key,
	158	unsigned int keylen)
	159	{
	160	return -ENOSYS;
	161	}
	162
	163	static void ahash_set_needkey(struct crypto_ahash *tfm)
	164	{
	165	const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
	166
	167	if (tfm->setkey != ahash_nosetkey &&
	168	!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
	169	crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
	170	}
	171
66f6ce5e	172	int crypto_ahash_setkey(struct crypto_ahash tfm, const u8 key,
004a403c LH	173	unsigned int keylen)
004a403c LH	174	{
004a403c	175	unsigned long alignmask = crypto_ahash_alignmask(tfm);
9fa68f62	176	int err;
004a403c LH	177
004a403c LH	178	if ((unsigned long)key & alignmask)
9fa68f62 EB	179	err = ahash_setkey_unaligned(tfm, key, keylen);
	180	else
	181	err = tfm->setkey(tfm, key, keylen);
	182
ba7d7433 EB	183	if (unlikely(err)) {
ba7d7433 EB	184	ahash_set_needkey(tfm);
9fa68f62	185	return err;
ba7d7433	186	}
004a403c	187
9fa68f62 EB	188	crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
9fa68f62 EB	189	return 0;
004a403c	190	}
66f6ce5e	191	EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
004a403c	192
66f6ce5e HX	193	static inline unsigned int ahash_align_buffer_size(unsigned len,
	194	unsigned long mask)
	195	{
	196	return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
	197	}
	198
1ffc9fbd	199	static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
66f6ce5e HX	200	{
	201	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	202	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	203	unsigned int ds = crypto_ahash_digestsize(tfm);
	204	struct ahash_request_priv *priv;
66f6ce5e HX	205
	206	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
	207	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	208	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	209	if (!priv)
	210	return -ENOMEM;
	211
ab6bf4e5 MV	212	/*
	213	* WARNING: Voodoo programming below!
	214	*
	215	* The code below is obscure and hard to understand, thus explanation
	216	* is necessary. See include/crypto/hash.h and include/linux/crypto.h
	217	* to understand the layout of structures used here!
	218	*
	219	* The code here will replace portions of the ORIGINAL request with
	220	* pointers to new code and buffers so the hashing operation can store
	221	* the result in aligned buffer. We will call the modified request
	222	* an ADJUSTED request.
	223	*
	224	* The newly mangled request will look as such:
	225	*
	226	* req {
	227	* .result = ADJUSTED[new aligned buffer]
	228	* .base.complete = ADJUSTED[pointer to completion function]
	229	* .base.data = ADJUSTED[*req (pointer to self)]
	230	* .priv = ADJUSTED[new priv] {
	231	* .result = ORIGINAL(result)
	232	* .complete = ORIGINAL(base.complete)
	233	* .data = ORIGINAL(base.data)
	234	* }
	235	*/
	236
66f6ce5e HX	237	priv->result = req->result;
	238	priv->complete = req->base.complete;
	239	priv->data = req->base.data;
ef0579b6 HX	240	priv->flags = req->base.flags;
ef0579b6 HX	241
ab6bf4e5 MV	242	/*
	243	* WARNING: We do not backup req->priv here! The req->priv
	244	* is for internal use of the Crypto API and the
	245	* user must _NOT_ _EVER_ depend on it's content!
	246	*/
66f6ce5e HX	247
66f6ce5e HX	248	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
1ffc9fbd	249	req->base.complete = cplt;
66f6ce5e HX	250	req->base.data = req;
	251	req->priv = priv;
	252
1ffc9fbd MV	253	return 0;
	254	}
	255
ef0579b6	256	static void ahash_restore_req(struct ahash_request *req, int err)
1ffc9fbd MV	257	{
	258	struct ahash_request_priv *priv = req->priv;
	259
ef0579b6 HX	260	if (!err)
	261	memcpy(priv->result, req->result,
	262	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	263
1ffc9fbd MV	264	/* Restore the original crypto request. */
1ffc9fbd MV	265	req->result = priv->result;
ef0579b6 HX	266
	267	ahash_request_set_callback(req, priv->flags,
	268	priv->complete, priv->data);
1ffc9fbd MV	269	req->priv = NULL;
	270
	271	/* Free the req->priv.priv from the ADJUSTED request. */
453431a5	272	kfree_sensitive(priv);
1ffc9fbd MV	273	}
1ffc9fbd MV	274
ef0579b6	275	static void ahash_notify_einprogress(struct ahash_request *req)
1ffc9fbd MV	276	{
1ffc9fbd MV	277	struct ahash_request_priv *priv = req->priv;
ef0579b6	278	struct crypto_async_request oreq;
1ffc9fbd	279
ef0579b6	280	oreq.data = priv->data;
1ffc9fbd	281
ef0579b6	282	priv->complete(&oreq, -EINPROGRESS);
1ffc9fbd MV	283	}
	284
	285	static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
	286	{
	287	struct ahash_request *areq = req->data;
	288
ef0579b6 HX	289	if (err == -EINPROGRESS) {
	290	ahash_notify_einprogress(areq);
	291	return;
	292	}
	293
1ffc9fbd MV	294	/*
	295	* Restore the original request, see ahash_op_unaligned() for what
	296	* goes where.
	297	*
	298	* The "struct ahash_request *req" here is in fact the "req.base"
	299	* from the ADJUSTED request from ahash_op_unaligned(), thus as it
	300	* is a pointer to self, it is also the ADJUSTED "req" .
	301	*/
	302
	303	/* First copy req->result into req->priv.result */
ef0579b6	304	ahash_restore_req(areq, err);
1ffc9fbd MV	305
	306	/* Complete the ORIGINAL request. */
	307	areq->base.complete(&areq->base, err);
	308	}
	309
	310	static int ahash_op_unaligned(struct ahash_request *req,
	311	int (op)(struct ahash_request ))
	312	{
	313	int err;
	314
	315	err = ahash_save_req(req, ahash_op_unaligned_done);
	316	if (err)
	317	return err;
	318
66f6ce5e	319	err = op(req);
4e5b0ad5	320	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6 HX	321	return err;
	322
	323	ahash_restore_req(req, err);
66f6ce5e HX	324
	325	return err;
	326	}
	327
	328	static int crypto_ahash_op(struct ahash_request *req,
	329	int (op)(struct ahash_request ))
	330	{
	331	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	332	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	333
	334	if ((unsigned long)req->result & alignmask)
	335	return ahash_op_unaligned(req, op);
	336
	337	return op(req);
	338	}
	339
	340	int crypto_ahash_final(struct ahash_request *req)
	341	{
f7d76e05 CL	342	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	343	struct crypto_alg *alg = tfm->base.__crt_alg;
	344	unsigned int nbytes = req->nbytes;
cac5818c CL	345	int ret;
cac5818c CL	346
f7d76e05	347	crypto_stats_get(alg);
cac5818c	348	ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
f7d76e05	349	crypto_stats_ahash_final(nbytes, ret, alg);
cac5818c	350	return ret;
66f6ce5e HX	351	}
	352	EXPORT_SYMBOL_GPL(crypto_ahash_final);
	353
	354	int crypto_ahash_finup(struct ahash_request *req)
	355	{
f7d76e05 CL	356	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	357	struct crypto_alg *alg = tfm->base.__crt_alg;
	358	unsigned int nbytes = req->nbytes;
cac5818c CL	359	int ret;
cac5818c CL	360
f7d76e05	361	crypto_stats_get(alg);
cac5818c	362	ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
f7d76e05	363	crypto_stats_ahash_final(nbytes, ret, alg);
cac5818c	364	return ret;
66f6ce5e HX	365	}
	366	EXPORT_SYMBOL_GPL(crypto_ahash_finup);
	367
	368	int crypto_ahash_digest(struct ahash_request *req)
	369	{
9fa68f62	370	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
f7d76e05 CL	371	struct crypto_alg *alg = tfm->base.__crt_alg;
f7d76e05 CL	372	unsigned int nbytes = req->nbytes;
cac5818c	373	int ret;
9fa68f62	374
f7d76e05	375	crypto_stats_get(alg);
9fa68f62	376	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
cac5818c CL	377	ret = -ENOKEY;
	378	else
	379	ret = crypto_ahash_op(req, tfm->digest);
f7d76e05	380	crypto_stats_ahash_final(nbytes, ret, alg);
cac5818c	381	return ret;
66f6ce5e HX	382	}
	383	EXPORT_SYMBOL_GPL(crypto_ahash_digest);
	384
ef0579b6	385	static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
66f6ce5e	386	{
ef0579b6	387	struct ahash_request *areq = req->data;
66f6ce5e HX	388
	389	if (err == -EINPROGRESS)
	390	return;
	391
ef0579b6	392	ahash_restore_req(areq, err);
66f6ce5e	393
d4a7a0fb	394	areq->base.complete(&areq->base, err);
66f6ce5e HX	395	}
	396
	397	static int ahash_def_finup_finish1(struct ahash_request *req, int err)
	398	{
	399	if (err)
	400	goto out;
	401
	402	req->base.complete = ahash_def_finup_done2;
ef0579b6	403
66f6ce5e	404	err = crypto_ahash_reqtfm(req)->final(req);
4e5b0ad5	405	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6	406	return err;
66f6ce5e HX	407
66f6ce5e HX	408	out:
ef0579b6	409	ahash_restore_req(req, err);
66f6ce5e HX	410	return err;
	411	}
	412
	413	static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
	414	{
	415	struct ahash_request *areq = req->data;
66f6ce5e	416
ef0579b6 HX	417	if (err == -EINPROGRESS) {
	418	ahash_notify_einprogress(areq);
	419	return;
	420	}
	421
	422	areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	423
66f6ce5e	424	err = ahash_def_finup_finish1(areq, err);
ef0579b6 HX	425	if (areq->priv)
ef0579b6 HX	426	return;
66f6ce5e	427
d4a7a0fb	428	areq->base.complete(&areq->base, err);
66f6ce5e HX	429	}
	430
	431	static int ahash_def_finup(struct ahash_request *req)
	432	{
	433	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
d4a7a0fb	434	int err;
66f6ce5e	435
d4a7a0fb MV	436	err = ahash_save_req(req, ahash_def_finup_done1);
	437	if (err)
	438	return err;
66f6ce5e	439
d4a7a0fb	440	err = tfm->update(req);
4e5b0ad5	441	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6 HX	442	return err;
ef0579b6 HX	443
d4a7a0fb	444	return ahash_def_finup_finish1(req, err);
66f6ce5e HX	445	}
66f6ce5e HX	446
e73d340d HX	447	static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
	448	{
	449	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	450	struct ahash_alg *alg = crypto_ahash_alg(hash);
	451
	452	alg->exit_tfm(hash);
	453	}
	454
88056ec3 HX	455	static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
	456	{
	457	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	458	struct ahash_alg *alg = crypto_ahash_alg(hash);
88056ec3	459
66f6ce5e	460	hash->setkey = ahash_nosetkey;
66f6ce5e	461
88056ec3 HX	462	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
	463	return crypto_init_shash_ops_async(tfm);
	464
88056ec3 HX	465	hash->init = alg->init;
88056ec3 HX	466	hash->update = alg->update;
66f6ce5e HX	467	hash->final = alg->final;
66f6ce5e HX	468	hash->finup = alg->finup ?: ahash_def_finup;
88056ec3	469	hash->digest = alg->digest;
6f221f7e KK	470	hash->export = alg->export;
6f221f7e KK	471	hash->import = alg->import;
66f6ce5e	472
a5596d63	473	if (alg->setkey) {
66f6ce5e	474	hash->setkey = alg->setkey;
ba7d7433	475	ahash_set_needkey(hash);
a5596d63	476	}
88056ec3	477
e73d340d HX	478	if (alg->exit_tfm)
	479	tfm->exit = crypto_ahash_exit_tfm;
	480
	481	return alg->init_tfm ? alg->init_tfm(hash) : 0;
88056ec3 HX	482	}
	483
	484	static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
	485	{
2495cf25 HX	486	if (alg->cra_type != &crypto_ahash_type)
2495cf25 HX	487	return sizeof(struct crypto_shash *);
88056ec3	488
2495cf25	489	return crypto_alg_extsize(alg);
88056ec3 HX	490	}
88056ec3 HX	491
48fb3e57 EB	492	static void crypto_ahash_free_instance(struct crypto_instance *inst)
	493	{
	494	struct ahash_instance *ahash = ahash_instance(inst);
	495
48fb3e57 EB	496	ahash->free(ahash);
	497	}
	498
3acc8473	499	#ifdef CONFIG_NET
6238cbae SK	500	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	501	{
	502	struct crypto_report_hash rhash;
	503
37db69e0 EB	504	memset(&rhash, 0, sizeof(rhash));
	505
	506	strscpy(rhash.type, "ahash", sizeof(rhash.type));
6238cbae SK	507
	508	rhash.blocksize = alg->cra_blocksize;
	509	rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
	510
37db69e0	511	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
6238cbae	512	}
3acc8473 HX	513	#else
	514	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	515	{
	516	return -ENOSYS;
	517	}
	518	#endif
6238cbae	519
004a403c	520	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	521	__maybe_unused;
004a403c LH	522	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	523	{
	524	seq_printf(m, "type : ahash\n");
	525	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	526	"yes" : "no");
	527	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
88056ec3 HX	528	seq_printf(m, "digestsize : %u\n",
88056ec3 HX	529	__crypto_hash_alg_common(alg)->digestsize);
004a403c LH	530	}
004a403c LH	531
6d1b41fc	532	static const struct crypto_type crypto_ahash_type = {
88056ec3 HX	533	.extsize = crypto_ahash_extsize,
88056ec3 HX	534	.init_tfm = crypto_ahash_init_tfm,
48fb3e57	535	.free = crypto_ahash_free_instance,
004a403c LH	536	#ifdef CONFIG_PROC_FS
	537	.show = crypto_ahash_show,
	538	#endif
6238cbae	539	.report = crypto_ahash_report,
88056ec3 HX	540	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	541	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
	542	.type = CRYPTO_ALG_TYPE_AHASH,
	543	.tfmsize = offsetof(struct crypto_ahash, base),
004a403c	544	};
004a403c	545
84a9c938 EB	546	int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
	547	struct crypto_instance *inst,
	548	const char *name, u32 type, u32 mask)
	549	{
	550	spawn->base.frontend = &crypto_ahash_type;
	551	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
	552	}
	553	EXPORT_SYMBOL_GPL(crypto_grab_ahash);
	554
88056ec3 HX	555	struct crypto_ahash crypto_alloc_ahash(const char alg_name, u32 type,
	556	u32 mask)
	557	{
	558	return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
	559	}
	560	EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
	561
8d18e34c HX	562	int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
	563	{
	564	return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
	565	}
	566	EXPORT_SYMBOL_GPL(crypto_has_ahash);
	567
01c2dece HX	568	static int ahash_prepare_alg(struct ahash_alg *alg)
	569	{
	570	struct crypto_alg *base = &alg->halg.base;
	571
b68a7ec1 KC	572	if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE \|\|
b68a7ec1 KC	573	alg->halg.statesize > HASH_MAX_STATESIZE \|\|
8996eafd	574	alg->halg.statesize == 0)
01c2dece HX	575	return -EINVAL;
	576
	577	base->cra_type = &crypto_ahash_type;
	578	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	579	base->cra_flags \|= CRYPTO_ALG_TYPE_AHASH;
	580
	581	return 0;
	582	}
	583
	584	int crypto_register_ahash(struct ahash_alg *alg)
	585	{
	586	struct crypto_alg *base = &alg->halg.base;
	587	int err;
	588
	589	err = ahash_prepare_alg(alg);
	590	if (err)
	591	return err;
	592
	593	return crypto_register_alg(base);
	594	}
	595	EXPORT_SYMBOL_GPL(crypto_register_ahash);
	596
c6d633a9	597	void crypto_unregister_ahash(struct ahash_alg *alg)
01c2dece	598	{
c6d633a9	599	crypto_unregister_alg(&alg->halg.base);
01c2dece HX	600	}
	601	EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
	602
6f7473c5 RV	603	int crypto_register_ahashes(struct ahash_alg *algs, int count)
	604	{
	605	int i, ret;
	606
	607	for (i = 0; i < count; i++) {
	608	ret = crypto_register_ahash(&algs[i]);
	609	if (ret)
	610	goto err;
	611	}
	612
	613	return 0;
	614
	615	err:
	616	for (--i; i >= 0; --i)
	617	crypto_unregister_ahash(&algs[i]);
	618
	619	return ret;
	620	}
	621	EXPORT_SYMBOL_GPL(crypto_register_ahashes);
	622
	623	void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
	624	{
	625	int i;
	626
	627	for (i = count - 1; i >= 0; --i)
	628	crypto_unregister_ahash(&algs[i]);
	629	}
	630	EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
	631
01c2dece HX	632	int ahash_register_instance(struct crypto_template *tmpl,
	633	struct ahash_instance *inst)
	634	{
	635	int err;
	636
d4fdc2df EB	637	if (WARN_ON(!inst->free))
	638	return -EINVAL;
	639
01c2dece HX	640	err = ahash_prepare_alg(&inst->alg);
	641	if (err)
	642	return err;
	643
	644	return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
	645	}
	646	EXPORT_SYMBOL_GPL(ahash_register_instance);
	647
cd6ed77a EB	648	bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
	649	{
	650	struct crypto_alg *alg = &halg->base;
	651
	652	if (alg->cra_type != &crypto_ahash_type)
	653	return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
	654
	655	return __crypto_ahash_alg(alg)->setkey != NULL;
	656	}
	657	EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
	658
004a403c LH	659	MODULE_LICENSE("GPL");
004a403c LH	660	MODULE_DESCRIPTION("Asynchronous cryptographic hash type");