[mirror_ubuntu-zesty-kernel.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 <linux/cryptouser.h>
#include <net/netlink.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 = kmap_atomic(walk->pg);
	walk->data += offset;

	if (offset & alignmask) {
		unsigned int unaligned = alignmask + 1 - (offset & alignmask);
		if (nbytes > unaligned)
			nbytes = unaligned;
	}

	walk->entrylen -= nbytes;
	return nbytes;
}

static int hash_walk_new_entry(struct crypto_hash_walk *walk)
{
	struct scatterlist *sg;

	sg = walk->sg;
	walk->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;
	}

	kunmap_atomic(walk->data);
	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);

	areq->base.complete = complete;
	areq->base.data = data;

	complete(&areq->base, 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 *);
}

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

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

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

	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
		    sizeof(struct crypto_report_hash), &rhash))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#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)
	__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
	.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),
};
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>
6238cbae SK	24	#include <linux/cryptouser.h>
6238cbae SK	25	#include <net/netlink.h>
004a403c LH	26
	27	#include "internal.h"
	28
66f6ce5e HX	29	struct ahash_request_priv {
	30	crypto_completion_t complete;
	31	void *data;
	32	u8 *result;
	33	void *ubuf[] CRYPTO_MINALIGN_ATTR;
	34	};
	35
88056ec3 HX	36	static inline struct ahash_alg crypto_ahash_alg(struct crypto_ahash hash)
	37	{
	38	return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
	39	halg);
	40	}
	41
20036252 HX	42	static int hash_walk_next(struct crypto_hash_walk *walk)
	43	{
	44	unsigned int alignmask = walk->alignmask;
	45	unsigned int offset = walk->offset;
	46	unsigned int nbytes = min(walk->entrylen,
	47	((unsigned int)(PAGE_SIZE)) - offset);
	48
f0dfc0b0	49	walk->data = kmap_atomic(walk->pg);
20036252 HX	50	walk->data += offset;
20036252 HX	51
23a75eee SÖ	52	if (offset & alignmask) {
	53	unsigned int unaligned = alignmask + 1 - (offset & alignmask);
	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;
	67	walk->pg = sg_page(sg);
	68	walk->offset = sg->offset;
	69	walk->entrylen = sg->length;
	70
	71	if (walk->entrylen > walk->total)
	72	walk->entrylen = walk->total;
	73	walk->total -= walk->entrylen;
	74
	75	return hash_walk_next(walk);
	76	}
	77
	78	int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
	79	{
	80	unsigned int alignmask = walk->alignmask;
	81	unsigned int nbytes = walk->entrylen;
	82
	83	walk->data -= walk->offset;
	84
	85	if (nbytes && walk->offset & alignmask && !err) {
20036252 HX	86	walk->offset = ALIGN(walk->offset, alignmask + 1);
	87	walk->data += walk->offset;
	88
	89	nbytes = min(nbytes,
	90	((unsigned int)(PAGE_SIZE)) - walk->offset);
	91	walk->entrylen -= nbytes;
	92
	93	return nbytes;
	94	}
	95
f0dfc0b0	96	kunmap_atomic(walk->data);
20036252 HX	97	crypto_yield(walk->flags);
	98
	99	if (err)
	100	return err;
	101
d315a0e0 HX	102	if (nbytes) {
	103	walk->offset = 0;
	104	walk->pg++;
20036252	105	return hash_walk_next(walk);
d315a0e0	106	}
20036252 HX	107
	108	if (!walk->total)
	109	return 0;
	110
	111	walk->sg = scatterwalk_sg_next(walk->sg);
	112
	113	return hash_walk_new_entry(walk);
	114	}
	115	EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
	116
	117	int crypto_hash_walk_first(struct ahash_request *req,
	118	struct crypto_hash_walk *walk)
	119	{
	120	walk->total = req->nbytes;
	121
	122	if (!walk->total)
	123	return 0;
	124
	125	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
	126	walk->sg = req->src;
	127	walk->flags = req->base.flags;
	128
	129	return hash_walk_new_entry(walk);
	130	}
	131	EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
	132
5f7082ed HX	133	int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
	134	struct crypto_hash_walk *walk,
	135	struct scatterlist *sg, unsigned int len)
	136	{
	137	walk->total = len;
	138
	139	if (!walk->total)
	140	return 0;
	141
	142	walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
	143	walk->sg = sg;
	144	walk->flags = hdesc->flags;
	145
	146	return hash_walk_new_entry(walk);
	147	}
	148
004a403c LH	149	static int ahash_setkey_unaligned(struct crypto_ahash tfm, const u8 key,
	150	unsigned int keylen)
	151	{
004a403c LH	152	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	153	int ret;
	154	u8 buffer, alignbuffer;
	155	unsigned long absize;
	156
	157	absize = keylen + alignmask;
093900c2	158	buffer = kmalloc(absize, GFP_KERNEL);
004a403c LH	159	if (!buffer)
	160	return -ENOMEM;
	161
	162	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	163	memcpy(alignbuffer, key, keylen);
a70c5225	164	ret = tfm->setkey(tfm, alignbuffer, keylen);
8c32c516	165	kzfree(buffer);
004a403c LH	166	return ret;
	167	}
	168
66f6ce5e	169	int crypto_ahash_setkey(struct crypto_ahash tfm, const u8 key,
004a403c LH	170	unsigned int keylen)
004a403c LH	171	{
004a403c LH	172	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	173
	174	if ((unsigned long)key & alignmask)
	175	return ahash_setkey_unaligned(tfm, key, keylen);
	176
a70c5225	177	return tfm->setkey(tfm, key, keylen);
004a403c	178	}
66f6ce5e	179	EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
004a403c	180
3751f402 HX	181	static int ahash_nosetkey(struct crypto_ahash tfm, const u8 key,
	182	unsigned int keylen)
	183	{
	184	return -ENOSYS;
	185	}
	186
66f6ce5e HX	187	static inline unsigned int ahash_align_buffer_size(unsigned len,
	188	unsigned long mask)
	189	{
	190	return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
	191	}
	192
	193	static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
	194	{
	195	struct ahash_request_priv *priv = req->priv;
	196
	197	if (err == -EINPROGRESS)
	198	return;
	199
	200	if (!err)
	201	memcpy(priv->result, req->result,
	202	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	203
	204	kzfree(priv);
	205	}
	206
	207	static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
	208	{
	209	struct ahash_request *areq = req->data;
	210	struct ahash_request_priv *priv = areq->priv;
	211	crypto_completion_t complete = priv->complete;
	212	void *data = priv->data;
	213
	214	ahash_op_unaligned_finish(areq, err);
	215
1d9a394b MV	216	areq->base.complete = complete;
	217	areq->base.data = data;
	218
	219	complete(&areq->base, err);
66f6ce5e HX	220	}
	221
	222	static int ahash_op_unaligned(struct ahash_request *req,
	223	int (op)(struct ahash_request ))
	224	{
	225	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	226	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	227	unsigned int ds = crypto_ahash_digestsize(tfm);
	228	struct ahash_request_priv *priv;
	229	int err;
	230
	231	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
	232	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	233	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	234	if (!priv)
	235	return -ENOMEM;
	236
	237	priv->result = req->result;
	238	priv->complete = req->base.complete;
	239	priv->data = req->base.data;
	240
	241	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
	242	req->base.complete = ahash_op_unaligned_done;
	243	req->base.data = req;
	244	req->priv = priv;
	245
	246	err = op(req);
	247	ahash_op_unaligned_finish(req, err);
	248
	249	return err;
	250	}
	251
	252	static int crypto_ahash_op(struct ahash_request *req,
	253	int (op)(struct ahash_request ))
	254	{
	255	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	256	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	257
	258	if ((unsigned long)req->result & alignmask)
	259	return ahash_op_unaligned(req, op);
	260
	261	return op(req);
	262	}
	263
	264	int crypto_ahash_final(struct ahash_request *req)
	265	{
	266	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
	267	}
	268	EXPORT_SYMBOL_GPL(crypto_ahash_final);
	269
	270	int crypto_ahash_finup(struct ahash_request *req)
	271	{
	272	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
	273	}
	274	EXPORT_SYMBOL_GPL(crypto_ahash_finup);
	275
	276	int crypto_ahash_digest(struct ahash_request *req)
	277	{
	278	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
	279	}
	280	EXPORT_SYMBOL_GPL(crypto_ahash_digest);
	281
	282	static void ahash_def_finup_finish2(struct ahash_request *req, int err)
	283	{
	284	struct ahash_request_priv *priv = req->priv;
	285
	286	if (err == -EINPROGRESS)
	287	return;
	288
	289	if (!err)
	290	memcpy(priv->result, req->result,
	291	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	292
	293	kzfree(priv);
	294	}
	295
	296	static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
	297	{
298	struct ahash_request *areq = req->data;
299	struct ahash_request_priv *priv = areq->priv;
300	crypto_completion_t complete = priv->complete;
301	void *data = priv->data;
302
303	ahash_def_finup_finish2(areq, err);
304
305	complete(data, err);
306	}
307
308	static int ahash_def_finup_finish1(struct ahash_request *req, int err)
309	{
310	if (err)
311	goto out;
312
313	req->base.complete = ahash_def_finup_done2;
314	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
315	err = crypto_ahash_reqtfm(req)->final(req);
316
317	out:
318	ahash_def_finup_finish2(req, err);
319	return err;
320	}
321
322	static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
323	{
324	struct ahash_request *areq = req->data;
325	struct ahash_request_priv *priv = areq->priv;
326	crypto_completion_t complete = priv->complete;
327	void *data = priv->data;
328
329	err = ahash_def_finup_finish1(areq, err);
330
331	complete(data, err);
332	}
333
334	static int ahash_def_finup(struct ahash_request *req)
335	{
336	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
337	unsigned long alignmask = crypto_ahash_alignmask(tfm);
338	unsigned int ds = crypto_ahash_digestsize(tfm);
339	struct ahash_request_priv *priv;
340
341	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
342	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	343	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	344	if (!priv)
	345	return -ENOMEM;
	346
	347	priv->result = req->result;
	348	priv->complete = req->base.complete;
	349	priv->data = req->base.data;
	350
	351	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
	352	req->base.complete = ahash_def_finup_done1;
	353	req->base.data = req;
	354	req->priv = priv;
	355
	356	return ahash_def_finup_finish1(req, tfm->update(req));
	357	}
	358
	359	static int ahash_no_export(struct ahash_request req, void out)
	360	{
	361	return -ENOSYS;
	362	}
	363
	364	static int ahash_no_import(struct ahash_request req, const void in)
	365	{
	366	return -ENOSYS;
	367	}
	368
88056ec3 HX	369	static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
	370	{
	371	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	372	struct ahash_alg *alg = crypto_ahash_alg(hash);
88056ec3	373
66f6ce5e HX	374	hash->setkey = ahash_nosetkey;
	375	hash->export = ahash_no_export;
	376	hash->import = ahash_no_import;
	377
88056ec3 HX	378	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
	379	return crypto_init_shash_ops_async(tfm);
	380
88056ec3 HX	381	hash->init = alg->init;
88056ec3 HX	382	hash->update = alg->update;
66f6ce5e HX	383	hash->final = alg->final;
66f6ce5e HX	384	hash->finup = alg->finup ?: ahash_def_finup;
88056ec3	385	hash->digest = alg->digest;
66f6ce5e HX	386
	387	if (alg->setkey)
	388	hash->setkey = alg->setkey;
	389	if (alg->export)
	390	hash->export = alg->export;
	391	if (alg->import)
	392	hash->import = alg->import;
88056ec3 HX	393
	394	return 0;
	395	}
	396
	397	static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
	398	{
	399	if (alg->cra_type == &crypto_ahash_type)
	400	return alg->cra_ctxsize;
	401
	402	return sizeof(struct crypto_shash *);
	403	}
	404
3acc8473	405	#ifdef CONFIG_NET
6238cbae SK	406	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	407	{
	408	struct crypto_report_hash rhash;
	409
9a5467bf	410	strncpy(rhash.type, "ahash", sizeof(rhash.type));
6238cbae SK	411
	412	rhash.blocksize = alg->cra_blocksize;
	413	rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
	414
6662df33 DM	415	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
	416	sizeof(struct crypto_report_hash), &rhash))
	417	goto nla_put_failure;
6238cbae SK	418	return 0;
	419
	420	nla_put_failure:
	421	return -EMSGSIZE;
	422	}
3acc8473 HX	423	#else
	424	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	425	{
	426	return -ENOSYS;
	427	}
	428	#endif
6238cbae	429
004a403c LH	430	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	431	__attribute__ ((unused));
	432	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	433	{
	434	seq_printf(m, "type : ahash\n");
	435	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	436	"yes" : "no");
	437	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
88056ec3 HX	438	seq_printf(m, "digestsize : %u\n",
88056ec3 HX	439	__crypto_hash_alg_common(alg)->digestsize);
004a403c LH	440	}
	441
	442	const struct crypto_type crypto_ahash_type = {
88056ec3 HX	443	.extsize = crypto_ahash_extsize,
88056ec3 HX	444	.init_tfm = crypto_ahash_init_tfm,
004a403c LH	445	#ifdef CONFIG_PROC_FS
	446	.show = crypto_ahash_show,
	447	#endif
6238cbae	448	.report = crypto_ahash_report,
88056ec3 HX	449	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	450	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
	451	.type = CRYPTO_ALG_TYPE_AHASH,
	452	.tfmsize = offsetof(struct crypto_ahash, base),
004a403c LH	453	};
	454	EXPORT_SYMBOL_GPL(crypto_ahash_type);
	455
88056ec3 HX	456	struct crypto_ahash crypto_alloc_ahash(const char alg_name, u32 type,
	457	u32 mask)
	458	{
	459	return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
	460	}
	461	EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
	462
01c2dece HX	463	static int ahash_prepare_alg(struct ahash_alg *alg)
	464	{
	465	struct crypto_alg *base = &alg->halg.base;
	466
	467	if (alg->halg.digestsize > PAGE_SIZE / 8 \|\|
	468	alg->halg.statesize > PAGE_SIZE / 8)
	469	return -EINVAL;
	470
	471	base->cra_type = &crypto_ahash_type;
	472	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	473	base->cra_flags \|= CRYPTO_ALG_TYPE_AHASH;
	474
	475	return 0;
	476	}
	477
	478	int crypto_register_ahash(struct ahash_alg *alg)
	479	{
	480	struct crypto_alg *base = &alg->halg.base;
	481	int err;
	482
	483	err = ahash_prepare_alg(alg);
	484	if (err)
	485	return err;
	486
	487	return crypto_register_alg(base);
	488	}
	489	EXPORT_SYMBOL_GPL(crypto_register_ahash);
	490
	491	int crypto_unregister_ahash(struct ahash_alg *alg)
	492	{
	493	return crypto_unregister_alg(&alg->halg.base);
	494	}
	495	EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
	496
	497	int ahash_register_instance(struct crypto_template *tmpl,
	498	struct ahash_instance *inst)
	499	{
	500	int err;
	501
	502	err = ahash_prepare_alg(&inst->alg);
	503	if (err)
	504	return err;
	505
	506	return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
	507	}
	508	EXPORT_SYMBOL_GPL(ahash_register_instance);
	509
	510	void ahash_free_instance(struct crypto_instance *inst)
	511	{
	512	crypto_drop_spawn(crypto_instance_ctx(inst));
	513	kfree(ahash_instance(inst));
	514	}
	515	EXPORT_SYMBOL_GPL(ahash_free_instance);
	516
	517	int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
	518	struct hash_alg_common *alg,
	519	struct crypto_instance *inst)
	520	{
	521	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	522	&crypto_ahash_type);
	523	}
	524	EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
	525
	526	struct hash_alg_common ahash_attr_alg(struct rtattr rta, u32 type, u32 mask)
527	{
528	struct crypto_alg *alg;
529
530	alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
531	return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
532	}
533	EXPORT_SYMBOL_GPL(ahash_attr_alg);
534
004a403c LH	535	MODULE_LICENSE("GPL");
004a403c LH	536	MODULE_DESCRIPTION("Asynchronous cryptographic hash type");