[linux-block.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 <lho@amcc.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <linux/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)
		nbytes = alignmask + 1 - (offset & alignmask);

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