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