[linux.git] / crypto / ahash.c

/*
 * 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]>
 *
 * 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/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#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;
	unsigned int offset = walk->offset;
	unsigned int nbytes = min(walk->entrylen,
				  ((unsigned int)(PAGE_SIZE)) - offset);

	walk->data = crypto_kmap(walk->pg, 0);
	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->pg = sg_page(sg);
	walk->offset = sg->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;
	unsigned int nbytes = walk->entrylen;

	walk->data -= walk->offset;

	if (nbytes && walk->offset & alignmask && !err) {
		walk->offset = ALIGN(walk->offset, alignmask + 1);
		walk->data += walk->offset;

		nbytes = min(nbytes,
			     ((unsigned int)(PAGE_SIZE)) - walk->offset);
		walk->entrylen -= nbytes;

		return nbytes;
	}

	crypto_kunmap(walk->data, 0);
	crypto_yield(walk->flags);

	if (err)
		return err;

	if (nbytes) {
		walk->offset = 0;
		walk->pg++;
		return hash_walk_next(walk);
	}

	if (!walk->total)
		return 0;

	walk->sg = scatterwalk_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)
		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);

int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
				  struct crypto_hash_walk *walk,
				  struct scatterlist *sg, unsigned int len)
{
	walk->total = len;

	if (!walk->total)
		return 0;

	walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
	walk->sg = sg;
	walk->flags = hdesc->flags;

	return hash_walk_new_entry(walk);
}

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;
}

int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
			unsigned int keylen)
{
	unsigned long alignmask = crypto_ahash_alignmask(tfm);

	if ((unsigned long)key & alignmask)
		return ahash_setkey_unaligned(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)
{
	return -ENOSYS;
}

static inline unsigned int ahash_align_buffer_size(unsigned len,
						   unsigned long mask)
{
	return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
}

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

	if (err == -EINPROGRESS)
		return;

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

	kzfree(priv);
}

static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
{
	struct ahash_request *areq = req->data;
	struct ahash_request_priv *priv = areq->priv;
	crypto_completion_t complete = priv->complete;
	void *data = priv->data;

	ahash_op_unaligned_finish(areq, err);

	complete(data, err);
}

static int ahash_op_unaligned(struct ahash_request *req,
			      int (*op)(struct ahash_request *))
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	unsigned int ds = crypto_ahash_digestsize(tfm);
	struct ahash_request_priv *priv;
	int err;

	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
		       (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
		       GFP_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_op_unaligned_done;
	req->base.data = req;
	req->priv = priv;

	err = op(req);
	ahash_op_unaligned_finish(req, err);

	return err;
}

static int crypto_ahash_op(struct ahash_request *req,
			   int (*op)(struct ahash_request *))
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	unsigned long alignmask = crypto_ahash_alignmask(tfm);

	if ((unsigned long)req->result & alignmask)
		return ahash_op_unaligned(req, op);

	return op(req);
}

int crypto_ahash_final(struct ahash_request *req)
{
	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
}
EXPORT_SYMBOL_GPL(crypto_ahash_final);

int crypto_ahash_finup(struct ahash_request *req)
{
	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
}
EXPORT_SYMBOL_GPL(crypto_ahash_finup);

int crypto_ahash_digest(struct ahash_request *req)
{
	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
}
EXPORT_SYMBOL_GPL(crypto_ahash_digest);

static void ahash_def_finup_finish2(struct ahash_request *req, int err)
{
	struct ahash_request_priv *priv = req->priv;

	if (err == -EINPROGRESS)
		return;

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

	kzfree(priv);
}

static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
{
	struct ahash_request *areq = req->data;
	struct ahash_request_priv *priv = areq->priv;
	crypto_completion_t complete = priv->complete;
	void *data = priv->data;

	ahash_def_finup_finish2(areq, err);

	complete(data, err);
}

static int ahash_def_finup_finish1(struct ahash_request *req, int err)
{
	if (err)
		goto out;

	req->base.complete = ahash_def_finup_done2;
	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	err = crypto_ahash_reqtfm(req)->final(req);

out:
	ahash_def_finup_finish2(req, err);
	return err;
}

static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
{
	struct ahash_request *areq = req->data;
	struct ahash_request_priv *priv = areq->priv;
	crypto_completion_t complete = priv->complete;
	void *data = priv->data;

	err = ahash_def_finup_finish1(areq, err);

	complete(data, err);
}

static int ahash_def_finup(struct ahash_request *req)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	unsigned int ds = crypto_ahash_digestsize(tfm);
	struct ahash_request_priv *priv;

	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
		       (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
		       GFP_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)
{
	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
	.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");
Commit	Line	Data
004a403c LH	1	/*
	2	* Asynchronous Cryptographic Hash operations.
	3	*
	4	* This is the asynchronous version of hash.c with notification of
	5	* completion via a callback.
	6	*
	7	* Copyright (c) 2008 Loc Ho <[email protected]>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*
	14	*/
	15
20036252 HX	16	#include <crypto/internal/hash.h>
20036252 HX	17	#include <crypto/scatterwalk.h>
004a403c LH	18	#include <linux/err.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/sched.h>
	22	#include <linux/slab.h>
	23	#include <linux/seq_file.h>
	24
	25	#include "internal.h"
	26
66f6ce5e HX	27	struct ahash_request_priv {
	28	crypto_completion_t complete;
	29	void *data;
	30	u8 *result;
	31	void *ubuf[] CRYPTO_MINALIGN_ATTR;
	32	};
	33
88056ec3 HX	34	static inline struct ahash_alg crypto_ahash_alg(struct crypto_ahash hash)
	35	{
	36	return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
	37	halg);
	38	}
	39
20036252 HX	40	static int hash_walk_next(struct crypto_hash_walk *walk)
	41	{
	42	unsigned int alignmask = walk->alignmask;
	43	unsigned int offset = walk->offset;
	44	unsigned int nbytes = min(walk->entrylen,
	45	((unsigned int)(PAGE_SIZE)) - offset);
	46
	47	walk->data = crypto_kmap(walk->pg, 0);
	48	walk->data += offset;
	49
23a75eee SÖ	50	if (offset & alignmask) {
	51	unsigned int unaligned = alignmask + 1 - (offset & alignmask);
	52	if (nbytes > unaligned)
	53	nbytes = unaligned;
	54	}
20036252 HX	55
	56	walk->entrylen -= nbytes;
	57	return nbytes;
	58	}
	59
	60	static int hash_walk_new_entry(struct crypto_hash_walk *walk)
	61	{
	62	struct scatterlist *sg;
	63
	64	sg = walk->sg;
	65	walk->pg = sg_page(sg);
	66	walk->offset = sg->offset;
	67	walk->entrylen = sg->length;
	68
	69	if (walk->entrylen > walk->total)
	70	walk->entrylen = walk->total;
	71	walk->total -= walk->entrylen;
	72
	73	return hash_walk_next(walk);
	74	}
	75
	76	int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
	77	{
	78	unsigned int alignmask = walk->alignmask;
	79	unsigned int nbytes = walk->entrylen;
	80
	81	walk->data -= walk->offset;
	82
	83	if (nbytes && walk->offset & alignmask && !err) {
20036252 HX	84	walk->offset = ALIGN(walk->offset, alignmask + 1);
	85	walk->data += walk->offset;
	86
	87	nbytes = min(nbytes,
	88	((unsigned int)(PAGE_SIZE)) - walk->offset);
	89	walk->entrylen -= nbytes;
	90
	91	return nbytes;
	92	}
	93
	94	crypto_kunmap(walk->data, 0);
	95	crypto_yield(walk->flags);
	96
	97	if (err)
	98	return err;
	99
d315a0e0 HX	100	if (nbytes) {
	101	walk->offset = 0;
	102	walk->pg++;
20036252	103	return hash_walk_next(walk);
d315a0e0	104	}
20036252 HX	105
	106	if (!walk->total)
	107	return 0;
	108
	109	walk->sg = scatterwalk_sg_next(walk->sg);
	110
	111	return hash_walk_new_entry(walk);
	112	}
	113	EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
	114
	115	int crypto_hash_walk_first(struct ahash_request *req,
	116	struct crypto_hash_walk *walk)
	117	{
	118	walk->total = req->nbytes;
	119
	120	if (!walk->total)
	121	return 0;
	122
	123	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
	124	walk->sg = req->src;
	125	walk->flags = req->base.flags;
	126
	127	return hash_walk_new_entry(walk);
	128	}
	129	EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
	130
5f7082ed HX	131	int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
	132	struct crypto_hash_walk *walk,
	133	struct scatterlist *sg, unsigned int len)
	134	{
	135	walk->total = len;
	136
	137	if (!walk->total)
	138	return 0;
	139
	140	walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
	141	walk->sg = sg;
	142	walk->flags = hdesc->flags;
	143
	144	return hash_walk_new_entry(walk);
	145	}
	146
004a403c LH	147	static int ahash_setkey_unaligned(struct crypto_ahash tfm, const u8 key,
	148	unsigned int keylen)
	149	{
004a403c LH	150	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	151	int ret;
	152	u8 buffer, alignbuffer;
	153	unsigned long absize;
	154
	155	absize = keylen + alignmask;
093900c2	156	buffer = kmalloc(absize, GFP_KERNEL);
004a403c LH	157	if (!buffer)
	158	return -ENOMEM;
	159
	160	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	161	memcpy(alignbuffer, key, keylen);
a70c5225	162	ret = tfm->setkey(tfm, alignbuffer, keylen);
8c32c516	163	kzfree(buffer);
004a403c LH	164	return ret;
	165	}
	166
66f6ce5e	167	int crypto_ahash_setkey(struct crypto_ahash tfm, const u8 key,
004a403c LH	168	unsigned int keylen)
004a403c LH	169	{
004a403c LH	170	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	171
	172	if ((unsigned long)key & alignmask)
	173	return ahash_setkey_unaligned(tfm, key, keylen);
	174
a70c5225	175	return tfm->setkey(tfm, key, keylen);
004a403c	176	}
66f6ce5e	177	EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
004a403c	178
3751f402 HX	179	static int ahash_nosetkey(struct crypto_ahash tfm, const u8 key,
	180	unsigned int keylen)
	181	{
	182	return -ENOSYS;
	183	}
	184
66f6ce5e HX	185	static inline unsigned int ahash_align_buffer_size(unsigned len,
	186	unsigned long mask)
	187	{
	188	return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
	189	}
	190
	191	static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
	192	{
	193	struct ahash_request_priv *priv = req->priv;
	194
	195	if (err == -EINPROGRESS)
	196	return;
	197
	198	if (!err)
	199	memcpy(priv->result, req->result,
	200	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	201
	202	kzfree(priv);
	203	}
	204
	205	static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
	206	{
	207	struct ahash_request *areq = req->data;
	208	struct ahash_request_priv *priv = areq->priv;
	209	crypto_completion_t complete = priv->complete;
	210	void *data = priv->data;
	211
	212	ahash_op_unaligned_finish(areq, err);
	213
	214	complete(data, err);
	215	}
	216
	217	static int ahash_op_unaligned(struct ahash_request *req,
	218	int (op)(struct ahash_request ))
	219	{
	220	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	221	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	222	unsigned int ds = crypto_ahash_digestsize(tfm);
	223	struct ahash_request_priv *priv;
	224	int err;
	225
	226	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
	227	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	228	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	229	if (!priv)
	230	return -ENOMEM;
	231
	232	priv->result = req->result;
	233	priv->complete = req->base.complete;
	234	priv->data = req->base.data;
	235
	236	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
	237	req->base.complete = ahash_op_unaligned_done;
	238	req->base.data = req;
	239	req->priv = priv;
	240
	241	err = op(req);
	242	ahash_op_unaligned_finish(req, err);
	243
	244	return err;
	245	}
	246
	247	static int crypto_ahash_op(struct ahash_request *req,
	248	int (op)(struct ahash_request ))
	249	{
	250	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	251	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	252
	253	if ((unsigned long)req->result & alignmask)
	254	return ahash_op_unaligned(req, op);
	255
	256	return op(req);
	257	}
	258
	259	int crypto_ahash_final(struct ahash_request *req)
	260	{
	261	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
	262	}
	263	EXPORT_SYMBOL_GPL(crypto_ahash_final);
	264
	265	int crypto_ahash_finup(struct ahash_request *req)
	266	{
	267	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
	268	}
	269	EXPORT_SYMBOL_GPL(crypto_ahash_finup);
	270
	271	int crypto_ahash_digest(struct ahash_request *req)
	272	{
	273	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
	274	}
	275	EXPORT_SYMBOL_GPL(crypto_ahash_digest);
	276
	277	static void ahash_def_finup_finish2(struct ahash_request *req, int err)
	278	{
	279	struct ahash_request_priv *priv = req->priv;
	280
	281	if (err == -EINPROGRESS)
	282	return;
	283
	284	if (!err)
	285	memcpy(priv->result, req->result,
	286	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	287
	288	kzfree(priv);
	289	}
	290
	291	static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
	292	{
293	struct ahash_request *areq = req->data;
294	struct ahash_request_priv *priv = areq->priv;
295	crypto_completion_t complete = priv->complete;
296	void *data = priv->data;
297
298	ahash_def_finup_finish2(areq, err);
299
300	complete(data, err);
301	}
302
303	static int ahash_def_finup_finish1(struct ahash_request *req, int err)
304	{
305	if (err)
306	goto out;
307
308	req->base.complete = ahash_def_finup_done2;
309	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
310	err = crypto_ahash_reqtfm(req)->final(req);
311
312	out:
313	ahash_def_finup_finish2(req, err);
314	return err;
315	}
316
317	static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
318	{
319	struct ahash_request *areq = req->data;
320	struct ahash_request_priv *priv = areq->priv;
321	crypto_completion_t complete = priv->complete;
322	void *data = priv->data;
323
324	err = ahash_def_finup_finish1(areq, err);
325
326	complete(data, err);
327	}
328
329	static int ahash_def_finup(struct ahash_request *req)
330	{
331	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
332	unsigned long alignmask = crypto_ahash_alignmask(tfm);
333	unsigned int ds = crypto_ahash_digestsize(tfm);
334	struct ahash_request_priv *priv;
335
336	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
337	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	338	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	339	if (!priv)
	340	return -ENOMEM;
	341
	342	priv->result = req->result;
	343	priv->complete = req->base.complete;
	344	priv->data = req->base.data;
	345
	346	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
	347	req->base.complete = ahash_def_finup_done1;
	348	req->base.data = req;
	349	req->priv = priv;
	350
	351	return ahash_def_finup_finish1(req, tfm->update(req));
	352	}
	353
	354	static int ahash_no_export(struct ahash_request req, void out)
	355	{
	356	return -ENOSYS;
	357	}
	358
	359	static int ahash_no_import(struct ahash_request req, const void in)
	360	{
	361	return -ENOSYS;
	362	}
	363
88056ec3 HX	364	static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
	365	{
	366	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	367	struct ahash_alg *alg = crypto_ahash_alg(hash);
88056ec3	368
66f6ce5e HX	369	hash->setkey = ahash_nosetkey;
	370	hash->export = ahash_no_export;
	371	hash->import = ahash_no_import;
	372
88056ec3 HX	373	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
	374	return crypto_init_shash_ops_async(tfm);
	375
88056ec3 HX	376	hash->init = alg->init;
88056ec3 HX	377	hash->update = alg->update;
66f6ce5e HX	378	hash->final = alg->final;
66f6ce5e HX	379	hash->finup = alg->finup ?: ahash_def_finup;
88056ec3	380	hash->digest = alg->digest;
66f6ce5e HX	381
	382	if (alg->setkey)
	383	hash->setkey = alg->setkey;
	384	if (alg->export)
	385	hash->export = alg->export;
	386	if (alg->import)
	387	hash->import = alg->import;
88056ec3 HX	388
	389	return 0;
	390	}
	391
	392	static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
	393	{
	394	if (alg->cra_type == &crypto_ahash_type)
	395	return alg->cra_ctxsize;
	396
	397	return sizeof(struct crypto_shash *);
	398	}
	399
004a403c LH	400	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	401	__attribute__ ((unused));
	402	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	403	{
	404	seq_printf(m, "type : ahash\n");
	405	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	406	"yes" : "no");
	407	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
88056ec3 HX	408	seq_printf(m, "digestsize : %u\n",
88056ec3 HX	409	__crypto_hash_alg_common(alg)->digestsize);
004a403c LH	410	}
	411
	412	const struct crypto_type crypto_ahash_type = {
88056ec3 HX	413	.extsize = crypto_ahash_extsize,
88056ec3 HX	414	.init_tfm = crypto_ahash_init_tfm,
004a403c LH	415	#ifdef CONFIG_PROC_FS
	416	.show = crypto_ahash_show,
	417	#endif
88056ec3 HX	418	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	419	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
	420	.type = CRYPTO_ALG_TYPE_AHASH,
	421	.tfmsize = offsetof(struct crypto_ahash, base),
004a403c LH	422	};
	423	EXPORT_SYMBOL_GPL(crypto_ahash_type);
	424
88056ec3 HX	425	struct crypto_ahash crypto_alloc_ahash(const char alg_name, u32 type,
	426	u32 mask)
	427	{
	428	return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
	429	}
	430	EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
	431
01c2dece HX	432	static int ahash_prepare_alg(struct ahash_alg *alg)
	433	{
	434	struct crypto_alg *base = &alg->halg.base;
	435
	436	if (alg->halg.digestsize > PAGE_SIZE / 8 \|\|
	437	alg->halg.statesize > PAGE_SIZE / 8)
	438	return -EINVAL;
	439
	440	base->cra_type = &crypto_ahash_type;
	441	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	442	base->cra_flags \|= CRYPTO_ALG_TYPE_AHASH;
	443
	444	return 0;
	445	}
	446
	447	int crypto_register_ahash(struct ahash_alg *alg)
	448	{
	449	struct crypto_alg *base = &alg->halg.base;
	450	int err;
	451
	452	err = ahash_prepare_alg(alg);
	453	if (err)
	454	return err;
	455
	456	return crypto_register_alg(base);
	457	}
	458	EXPORT_SYMBOL_GPL(crypto_register_ahash);
	459
	460	int crypto_unregister_ahash(struct ahash_alg *alg)
	461	{
	462	return crypto_unregister_alg(&alg->halg.base);
	463	}
	464	EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
	465
	466	int ahash_register_instance(struct crypto_template *tmpl,
	467	struct ahash_instance *inst)
	468	{
	469	int err;
	470
	471	err = ahash_prepare_alg(&inst->alg);
	472	if (err)
	473	return err;
	474
	475	return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
	476	}
	477	EXPORT_SYMBOL_GPL(ahash_register_instance);
	478
	479	void ahash_free_instance(struct crypto_instance *inst)
	480	{
	481	crypto_drop_spawn(crypto_instance_ctx(inst));
	482	kfree(ahash_instance(inst));
	483	}
	484	EXPORT_SYMBOL_GPL(ahash_free_instance);
	485
	486	int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
	487	struct hash_alg_common *alg,
	488	struct crypto_instance *inst)
	489	{
	490	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	491	&crypto_ahash_type);
	492	}
	493	EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
	494
	495	struct hash_alg_common ahash_attr_alg(struct rtattr rta, u32 type, u32 mask)
496	{
497	struct crypto_alg *alg;
498
499	alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
500	return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
501	}
502	EXPORT_SYMBOL_GPL(ahash_attr_alg);
503
004a403c LH	504	MODULE_LICENSE("GPL");
004a403c LH	505	MODULE_DESCRIPTION("Asynchronous cryptographic hash type");