[linux-2.6-block.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 <lho@amcc.com>
 */

#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_local_page(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_local(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 int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
			  bool has_state)
{
	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 *subreq;
	unsigned int subreq_size;
	unsigned int reqsize;
	u8 *result;
	gfp_t gfp;
	u32 flags;

	subreq_size = sizeof(*subreq);
	reqsize = crypto_ahash_reqsize(tfm);
	reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
	subreq_size += reqsize;
	subreq_size += ds;
	subreq_size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);

	flags = ahash_request_flags(req);
	gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?  GFP_KERNEL : GFP_ATOMIC;
	subreq = kmalloc(subreq_size, gfp);
	if (!subreq)
		return -ENOMEM;

	ahash_request_set_tfm(subreq, tfm);
	ahash_request_set_callback(subreq, flags, cplt, req);

	result = (u8 *)(subreq + 1) + reqsize;
	result = PTR_ALIGN(result, alignmask + 1);

	ahash_request_set_crypt(subreq, req->src, result, req->nbytes);

	if (has_state) {
		void *state;

		state = kmalloc(crypto_ahash_statesize(tfm), gfp);
		if (!state) {
			kfree(subreq);
			return -ENOMEM;
		}

		crypto_ahash_export(req, state);
		crypto_ahash_import(subreq, state);
		kfree_sensitive(state);
	}

	req->priv = subreq;

	return 0;
}

static void ahash_restore_req(struct ahash_request *req, int err)
{
	struct ahash_request *subreq = req->priv;

	if (!err)
		memcpy(req->result, subreq->result,
		       crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));

	req->priv = NULL;

	kfree_sensitive(subreq);
}

static void ahash_op_unaligned_done(void *data, int err)
{
	struct ahash_request *areq = data;

	if (err == -EINPROGRESS)
		goto out;

	/* First copy req->result into req->priv.result */
	ahash_restore_req(areq, err);

out:
	/* Complete the ORIGINAL request. */
	ahash_request_complete(areq, err);
}

static int ahash_op_unaligned(struct ahash_request *req,
			      int (*op)(struct ahash_request *),
			      bool has_state)
{
	int err;

	err = ahash_save_req(req, ahash_op_unaligned_done, has_state);
	if (err)
		return err;

	err = op(req->priv);
	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 *),
			   bool has_state)
{
	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, has_state);

	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, true);
	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, true);
	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, false);
	crypto_stats_ahash_final(nbytes, ret, alg);
	return ret;
}
EXPORT_SYMBOL_GPL(crypto_ahash_digest);

static void ahash_def_finup_done2(void *data, int err)
{
	struct ahash_request *areq = data;

	if (err == -EINPROGRESS)
		return;

	ahash_restore_req(areq, err);

	ahash_request_complete(areq, err);
}

static int ahash_def_finup_finish1(struct ahash_request *req, int err)
{
	struct ahash_request *subreq = req->priv;

	if (err)
		goto out;

	subreq->base.complete = ahash_def_finup_done2;

	err = crypto_ahash_reqtfm(req)->final(subreq);
	if (err == -EINPROGRESS || err == -EBUSY)
		return err;

out:
	ahash_restore_req(req, err);
	return err;
}

static void ahash_def_finup_done1(void *data, int err)
{
	struct ahash_request *areq = data;
	struct ahash_request *subreq;

	if (err == -EINPROGRESS)
		goto out;

	subreq = areq->priv;
	subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;

	err = ahash_def_finup_finish1(areq, err);
	if (err == -EINPROGRESS || err == -EBUSY)
		return;

out:
	ahash_request_complete(areq, 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, true);
	if (err)
		return err;

	err = tfm->update(req->priv);
	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 <lho@amcc.com>
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
aa969515	48	walk->data = kmap_local_page(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
aa969515	98	kunmap_local(walk->data);
8afa25aa	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
d9588045 HX	193	static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
d9588045 HX	194	bool has_state)
66f6ce5e HX	195	{
	196	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	197	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	198	unsigned int ds = crypto_ahash_digestsize(tfm);
d9588045 HX	199	struct ahash_request *subreq;
	200	unsigned int subreq_size;
	201	unsigned int reqsize;
	202	u8 *result;
	203	gfp_t gfp;
	204	u32 flags;
66f6ce5e	205
d9588045 HX	206	subreq_size = sizeof(*subreq);
	207	reqsize = crypto_ahash_reqsize(tfm);
	208	reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
	209	subreq_size += reqsize;
	210	subreq_size += ds;
	211	subreq_size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	212
	213	flags = ahash_request_flags(req);
	214	gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
	215	subreq = kmalloc(subreq_size, gfp);
	216	if (!subreq)
66f6ce5e HX	217	return -ENOMEM;
66f6ce5e HX	218
d9588045 HX	219	ahash_request_set_tfm(subreq, tfm);
	220	ahash_request_set_callback(subreq, flags, cplt, req);
	221
	222	result = (u8 *)(subreq + 1) + reqsize;
	223	result = PTR_ALIGN(result, alignmask + 1);
	224
	225	ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
	226
	227	if (has_state) {
	228	void *state;
	229
	230	state = kmalloc(crypto_ahash_statesize(tfm), gfp);
	231	if (!state) {
	232	kfree(subreq);
	233	return -ENOMEM;
	234	}
	235
	236	crypto_ahash_export(req, state);
	237	crypto_ahash_import(subreq, state);
	238	kfree_sensitive(state);
	239	}
	240
	241	req->priv = subreq;
66f6ce5e	242
1ffc9fbd MV	243	return 0;
	244	}
	245
ef0579b6	246	static void ahash_restore_req(struct ahash_request *req, int err)
1ffc9fbd	247	{
d9588045	248	struct ahash_request *subreq = req->priv;
1ffc9fbd	249
ef0579b6	250	if (!err)
d9588045	251	memcpy(req->result, subreq->result,
ef0579b6 HX	252	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
ef0579b6 HX	253
1ffc9fbd MV	254	req->priv = NULL;
1ffc9fbd MV	255
d9588045	256	kfree_sensitive(subreq);
1ffc9fbd MV	257	}
1ffc9fbd MV	258
255e48eb	259	static void ahash_op_unaligned_done(void *data, int err)
1ffc9fbd	260	{
255e48eb	261	struct ahash_request *areq = data;
1ffc9fbd	262
d9588045 HX	263	if (err == -EINPROGRESS)
d9588045 HX	264	goto out;
1ffc9fbd MV	265
1ffc9fbd MV	266	/* First copy req->result into req->priv.result */
ef0579b6	267	ahash_restore_req(areq, err);
1ffc9fbd	268
d9588045	269	out:
1ffc9fbd	270	/* Complete the ORIGINAL request. */
d9588045	271	ahash_request_complete(areq, err);
1ffc9fbd MV	272	}
	273
	274	static int ahash_op_unaligned(struct ahash_request *req,
d9588045 HX	275	int (op)(struct ahash_request ),
d9588045 HX	276	bool has_state)
1ffc9fbd MV	277	{
	278	int err;
	279
d9588045	280	err = ahash_save_req(req, ahash_op_unaligned_done, has_state);
1ffc9fbd MV	281	if (err)
	282	return err;
	283
d9588045	284	err = op(req->priv);
4e5b0ad5	285	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6 HX	286	return err;
	287
	288	ahash_restore_req(req, err);
66f6ce5e HX	289
	290	return err;
	291	}
	292
	293	static int crypto_ahash_op(struct ahash_request *req,
d9588045 HX	294	int (op)(struct ahash_request ),
d9588045 HX	295	bool has_state)
66f6ce5e HX	296	{
	297	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	298	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	299
	300	if ((unsigned long)req->result & alignmask)
d9588045	301	return ahash_op_unaligned(req, op, has_state);
66f6ce5e HX	302
	303	return op(req);
	304	}
	305
	306	int crypto_ahash_final(struct ahash_request *req)
	307	{
f7d76e05 CL	308	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	309	struct crypto_alg *alg = tfm->base.__crt_alg;
	310	unsigned int nbytes = req->nbytes;
cac5818c CL	311	int ret;
cac5818c CL	312
f7d76e05	313	crypto_stats_get(alg);
d9588045	314	ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final, true);
f7d76e05	315	crypto_stats_ahash_final(nbytes, ret, alg);
cac5818c	316	return ret;
66f6ce5e HX	317	}
	318	EXPORT_SYMBOL_GPL(crypto_ahash_final);
	319
	320	int crypto_ahash_finup(struct ahash_request *req)
	321	{
f7d76e05 CL	322	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	323	struct crypto_alg *alg = tfm->base.__crt_alg;
	324	unsigned int nbytes = req->nbytes;
cac5818c CL	325	int ret;
cac5818c CL	326
f7d76e05	327	crypto_stats_get(alg);
d9588045	328	ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup, true);
f7d76e05	329	crypto_stats_ahash_final(nbytes, ret, alg);
cac5818c	330	return ret;
66f6ce5e HX	331	}
	332	EXPORT_SYMBOL_GPL(crypto_ahash_finup);
	333
	334	int crypto_ahash_digest(struct ahash_request *req)
	335	{
9fa68f62	336	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
f7d76e05 CL	337	struct crypto_alg *alg = tfm->base.__crt_alg;
f7d76e05 CL	338	unsigned int nbytes = req->nbytes;
cac5818c	339	int ret;
9fa68f62	340
f7d76e05	341	crypto_stats_get(alg);
9fa68f62	342	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
cac5818c CL	343	ret = -ENOKEY;
cac5818c CL	344	else
d9588045	345	ret = crypto_ahash_op(req, tfm->digest, false);
f7d76e05	346	crypto_stats_ahash_final(nbytes, ret, alg);
cac5818c	347	return ret;
66f6ce5e HX	348	}
	349	EXPORT_SYMBOL_GPL(crypto_ahash_digest);
	350
255e48eb	351	static void ahash_def_finup_done2(void *data, int err)
66f6ce5e	352	{
255e48eb	353	struct ahash_request *areq = data;
66f6ce5e HX	354
	355	if (err == -EINPROGRESS)
	356	return;
	357
ef0579b6	358	ahash_restore_req(areq, err);
66f6ce5e	359
d9588045	360	ahash_request_complete(areq, err);
66f6ce5e HX	361	}
	362
	363	static int ahash_def_finup_finish1(struct ahash_request *req, int err)
	364	{
d9588045 HX	365	struct ahash_request *subreq = req->priv;
d9588045 HX	366
66f6ce5e HX	367	if (err)
	368	goto out;
	369
d9588045	370	subreq->base.complete = ahash_def_finup_done2;
ef0579b6	371
d9588045	372	err = crypto_ahash_reqtfm(req)->final(subreq);
4e5b0ad5	373	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6	374	return err;
66f6ce5e HX	375
66f6ce5e HX	376	out:
ef0579b6	377	ahash_restore_req(req, err);
66f6ce5e HX	378	return err;
	379	}
	380
255e48eb	381	static void ahash_def_finup_done1(void *data, int err)
66f6ce5e	382	{
255e48eb	383	struct ahash_request *areq = data;
d9588045	384	struct ahash_request *subreq;
66f6ce5e	385
d9588045 HX	386	if (err == -EINPROGRESS)
d9588045 HX	387	goto out;
ef0579b6	388
d9588045 HX	389	subreq = areq->priv;
d9588045 HX	390	subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
ef0579b6	391
66f6ce5e	392	err = ahash_def_finup_finish1(areq, err);
d9588045	393	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6	394	return;
66f6ce5e	395
d9588045 HX	396	out:
d9588045 HX	397	ahash_request_complete(areq, err);
66f6ce5e HX	398	}
	399
	400	static int ahash_def_finup(struct ahash_request *req)
	401	{
	402	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
d4a7a0fb	403	int err;
66f6ce5e	404
d9588045	405	err = ahash_save_req(req, ahash_def_finup_done1, true);
d4a7a0fb MV	406	if (err)
d4a7a0fb MV	407	return err;
66f6ce5e	408
d9588045	409	err = tfm->update(req->priv);
4e5b0ad5	410	if (err == -EINPROGRESS \|\| err == -EBUSY)
ef0579b6 HX	411	return err;
ef0579b6 HX	412
d4a7a0fb	413	return ahash_def_finup_finish1(req, err);
66f6ce5e HX	414	}
66f6ce5e HX	415
e73d340d HX	416	static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
	417	{
	418	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	419	struct ahash_alg *alg = crypto_ahash_alg(hash);
	420
	421	alg->exit_tfm(hash);
	422	}
	423
88056ec3 HX	424	static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
	425	{
	426	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	427	struct ahash_alg *alg = crypto_ahash_alg(hash);
88056ec3	428
66f6ce5e	429	hash->setkey = ahash_nosetkey;
66f6ce5e	430
88056ec3 HX	431	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
	432	return crypto_init_shash_ops_async(tfm);
	433
88056ec3 HX	434	hash->init = alg->init;
88056ec3 HX	435	hash->update = alg->update;
66f6ce5e HX	436	hash->final = alg->final;
66f6ce5e HX	437	hash->finup = alg->finup ?: ahash_def_finup;
88056ec3	438	hash->digest = alg->digest;
6f221f7e KK	439	hash->export = alg->export;
6f221f7e KK	440	hash->import = alg->import;
66f6ce5e	441
a5596d63	442	if (alg->setkey) {
66f6ce5e	443	hash->setkey = alg->setkey;
ba7d7433	444	ahash_set_needkey(hash);
a5596d63	445	}
88056ec3	446
e73d340d HX	447	if (alg->exit_tfm)
	448	tfm->exit = crypto_ahash_exit_tfm;
	449
	450	return alg->init_tfm ? alg->init_tfm(hash) : 0;
88056ec3 HX	451	}
	452
	453	static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
	454	{
2495cf25 HX	455	if (alg->cra_type != &crypto_ahash_type)
2495cf25 HX	456	return sizeof(struct crypto_shash *);
88056ec3	457
2495cf25	458	return crypto_alg_extsize(alg);
88056ec3 HX	459	}
88056ec3 HX	460
48fb3e57 EB	461	static void crypto_ahash_free_instance(struct crypto_instance *inst)
	462	{
	463	struct ahash_instance *ahash = ahash_instance(inst);
	464
48fb3e57 EB	465	ahash->free(ahash);
	466	}
	467
3acc8473	468	#ifdef CONFIG_NET
6238cbae SK	469	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	470	{
	471	struct crypto_report_hash rhash;
	472
37db69e0 EB	473	memset(&rhash, 0, sizeof(rhash));
	474
	475	strscpy(rhash.type, "ahash", sizeof(rhash.type));
6238cbae SK	476
	477	rhash.blocksize = alg->cra_blocksize;
	478	rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
	479
37db69e0	480	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
6238cbae	481	}
3acc8473 HX	482	#else
	483	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	484	{
	485	return -ENOSYS;
	486	}
	487	#endif
6238cbae	488
004a403c	489	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	490	__maybe_unused;
004a403c LH	491	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	492	{
	493	seq_printf(m, "type : ahash\n");
	494	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	495	"yes" : "no");
	496	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
88056ec3 HX	497	seq_printf(m, "digestsize : %u\n",
88056ec3 HX	498	__crypto_hash_alg_common(alg)->digestsize);
004a403c LH	499	}
004a403c LH	500
6d1b41fc	501	static const struct crypto_type crypto_ahash_type = {
88056ec3 HX	502	.extsize = crypto_ahash_extsize,
88056ec3 HX	503	.init_tfm = crypto_ahash_init_tfm,
48fb3e57	504	.free = crypto_ahash_free_instance,
004a403c LH	505	#ifdef CONFIG_PROC_FS
	506	.show = crypto_ahash_show,
	507	#endif
6238cbae	508	.report = crypto_ahash_report,
88056ec3 HX	509	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	510	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
	511	.type = CRYPTO_ALG_TYPE_AHASH,
	512	.tfmsize = offsetof(struct crypto_ahash, base),
004a403c	513	};
004a403c	514
84a9c938 EB	515	int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
	516	struct crypto_instance *inst,
	517	const char *name, u32 type, u32 mask)
	518	{
	519	spawn->base.frontend = &crypto_ahash_type;
	520	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
	521	}
	522	EXPORT_SYMBOL_GPL(crypto_grab_ahash);
	523
88056ec3 HX	524	struct crypto_ahash crypto_alloc_ahash(const char alg_name, u32 type,
	525	u32 mask)
	526	{
	527	return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
	528	}
	529	EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
	530
8d18e34c HX	531	int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
	532	{
	533	return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
	534	}
	535	EXPORT_SYMBOL_GPL(crypto_has_ahash);
	536
01c2dece HX	537	static int ahash_prepare_alg(struct ahash_alg *alg)
	538	{
	539	struct crypto_alg *base = &alg->halg.base;
	540
b68a7ec1 KC	541	if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE \|\|
b68a7ec1 KC	542	alg->halg.statesize > HASH_MAX_STATESIZE \|\|
8996eafd	543	alg->halg.statesize == 0)
01c2dece HX	544	return -EINVAL;
	545
	546	base->cra_type = &crypto_ahash_type;
	547	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	548	base->cra_flags \|= CRYPTO_ALG_TYPE_AHASH;
	549
	550	return 0;
	551	}
	552
	553	int crypto_register_ahash(struct ahash_alg *alg)
	554	{
	555	struct crypto_alg *base = &alg->halg.base;
	556	int err;
	557
	558	err = ahash_prepare_alg(alg);
	559	if (err)
	560	return err;
	561
	562	return crypto_register_alg(base);
	563	}
	564	EXPORT_SYMBOL_GPL(crypto_register_ahash);
	565
c6d633a9	566	void crypto_unregister_ahash(struct ahash_alg *alg)
01c2dece	567	{
c6d633a9	568	crypto_unregister_alg(&alg->halg.base);
01c2dece HX	569	}
	570	EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
	571
6f7473c5 RV	572	int crypto_register_ahashes(struct ahash_alg *algs, int count)
	573	{
	574	int i, ret;
	575
	576	for (i = 0; i < count; i++) {
	577	ret = crypto_register_ahash(&algs[i]);
	578	if (ret)
	579	goto err;
	580	}
	581
	582	return 0;
	583
	584	err:
	585	for (--i; i >= 0; --i)
	586	crypto_unregister_ahash(&algs[i]);
	587
	588	return ret;
	589	}
	590	EXPORT_SYMBOL_GPL(crypto_register_ahashes);
	591
	592	void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
	593	{
	594	int i;
	595
	596	for (i = count - 1; i >= 0; --i)
	597	crypto_unregister_ahash(&algs[i]);
	598	}
	599	EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
	600
01c2dece HX	601	int ahash_register_instance(struct crypto_template *tmpl,
	602	struct ahash_instance *inst)
	603	{
	604	int err;
	605
d4fdc2df EB	606	if (WARN_ON(!inst->free))
	607	return -EINVAL;
	608
01c2dece HX	609	err = ahash_prepare_alg(&inst->alg);
	610	if (err)
	611	return err;
	612
	613	return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
	614	}
	615	EXPORT_SYMBOL_GPL(ahash_register_instance);
	616
cd6ed77a EB	617	bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
	618	{
	619	struct crypto_alg *alg = &halg->base;
	620
	621	if (alg->cra_type != &crypto_ahash_type)
	622	return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
	623
	624	return __crypto_ahash_alg(alg)->setkey != NULL;
	625	}
	626	EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
	627
004a403c LH	628	MODULE_LICENSE("GPL");
004a403c LH	629	MODULE_DESCRIPTION("Asynchronous cryptographic hash type");