[GitHub/mt8127/android_kernel_alcatel_ttab.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->offset = sg->offset;
	walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
	walk->offset = offset_in_page(walk->offset);
	walk->entrylen = sg->length;

	if (walk->entrylen > walk->total)
		walk->entrylen = walk->total;
	walk->total -= walk->entrylen;

	return hash_walk_next(walk);
}

int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
{
	unsigned int alignmask = walk->alignmask;
	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);

	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->has_setkey = false;
	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;
		hash->has_setkey = true;
	}
	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 ||
	    alg->halg.statesize == 0)
		return -EINVAL;

	base->cra_type = &crypto_ahash_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;

	return 0;
}

int crypto_register_ahash(struct ahash_alg *alg)
{
	struct crypto_alg *base = &alg->halg.base;
	int err;

	err = ahash_prepare_alg(alg);
	if (err)
		return err;

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_ahash);

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;
20036252	67	walk->offset = sg->offset;
f220ec58 HX	68	walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
f220ec58 HX	69	walk->offset = offset_in_page(walk->offset);
20036252 HX	70	walk->entrylen = sg->length;
	71
	72	if (walk->entrylen > walk->total)
	73	walk->entrylen = walk->total;
	74	walk->total -= walk->entrylen;
	75
	76	return hash_walk_next(walk);
	77	}
	78
	79	int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
	80	{
	81	unsigned int alignmask = walk->alignmask;
	82	unsigned int nbytes = walk->entrylen;
	83
	84	walk->data -= walk->offset;
	85
	86	if (nbytes && walk->offset & alignmask && !err) {
20036252 HX	87	walk->offset = ALIGN(walk->offset, alignmask + 1);
	88	walk->data += walk->offset;
	89
	90	nbytes = min(nbytes,
	91	((unsigned int)(PAGE_SIZE)) - walk->offset);
	92	walk->entrylen -= nbytes;
	93
	94	return nbytes;
	95	}
	96
f0dfc0b0	97	kunmap_atomic(walk->data);
20036252 HX	98	crypto_yield(walk->flags);
	99
	100	if (err)
	101	return err;
	102
d315a0e0 HX	103	if (nbytes) {
	104	walk->offset = 0;
	105	walk->pg++;
20036252	106	return hash_walk_next(walk);
d315a0e0	107	}
20036252 HX	108
	109	if (!walk->total)
	110	return 0;
	111
	112	walk->sg = scatterwalk_sg_next(walk->sg);
	113
	114	return hash_walk_new_entry(walk);
	115	}
	116	EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
	117
	118	int crypto_hash_walk_first(struct ahash_request *req,
	119	struct crypto_hash_walk *walk)
	120	{
	121	walk->total = req->nbytes;
	122
	123	if (!walk->total)
	124	return 0;
	125
	126	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
	127	walk->sg = req->src;
	128	walk->flags = req->base.flags;
	129
	130	return hash_walk_new_entry(walk);
	131	}
	132	EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
	133
5f7082ed HX	134	int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
	135	struct crypto_hash_walk *walk,
	136	struct scatterlist *sg, unsigned int len)
	137	{
	138	walk->total = len;
	139
	140	if (!walk->total)
	141	return 0;
	142
	143	walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
	144	walk->sg = sg;
	145	walk->flags = hdesc->flags;
	146
	147	return hash_walk_new_entry(walk);
	148	}
	149
004a403c LH	150	static int ahash_setkey_unaligned(struct crypto_ahash tfm, const u8 key,
	151	unsigned int keylen)
	152	{
004a403c LH	153	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	154	int ret;
	155	u8 buffer, alignbuffer;
	156	unsigned long absize;
	157
	158	absize = keylen + alignmask;
093900c2	159	buffer = kmalloc(absize, GFP_KERNEL);
004a403c LH	160	if (!buffer)
	161	return -ENOMEM;
	162
	163	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	164	memcpy(alignbuffer, key, keylen);
a70c5225	165	ret = tfm->setkey(tfm, alignbuffer, keylen);
8c32c516	166	kzfree(buffer);
004a403c LH	167	return ret;
	168	}
	169
66f6ce5e	170	int crypto_ahash_setkey(struct crypto_ahash tfm, const u8 key,
004a403c LH	171	unsigned int keylen)
004a403c LH	172	{
004a403c LH	173	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	174
	175	if ((unsigned long)key & alignmask)
	176	return ahash_setkey_unaligned(tfm, key, keylen);
	177
a70c5225	178	return tfm->setkey(tfm, key, keylen);
004a403c	179	}
66f6ce5e	180	EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
004a403c	181
3751f402 HX	182	static int ahash_nosetkey(struct crypto_ahash tfm, const u8 key,
	183	unsigned int keylen)
	184	{
	185	return -ENOSYS;
	186	}
	187
66f6ce5e HX	188	static inline unsigned int ahash_align_buffer_size(unsigned len,
	189	unsigned long mask)
	190	{
	191	return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
	192	}
	193
	194	static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
	195	{
	196	struct ahash_request_priv *priv = req->priv;
	197
	198	if (err == -EINPROGRESS)
	199	return;
	200
	201	if (!err)
	202	memcpy(priv->result, req->result,
	203	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	204
	205	kzfree(priv);
	206	}
	207
	208	static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
	209	{
	210	struct ahash_request *areq = req->data;
	211	struct ahash_request_priv *priv = areq->priv;
	212	crypto_completion_t complete = priv->complete;
	213	void *data = priv->data;
	214
	215	ahash_op_unaligned_finish(areq, err);
	216
	217	complete(data, err);
	218	}
	219
	220	static int ahash_op_unaligned(struct ahash_request *req,
	221	int (op)(struct ahash_request ))
	222	{
	223	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	224	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	225	unsigned int ds = crypto_ahash_digestsize(tfm);
	226	struct ahash_request_priv *priv;
	227	int err;
	228
	229	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
	230	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	231	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	232	if (!priv)
	233	return -ENOMEM;
	234
	235	priv->result = req->result;
	236	priv->complete = req->base.complete;
	237	priv->data = req->base.data;
	238
	239	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
	240	req->base.complete = ahash_op_unaligned_done;
	241	req->base.data = req;
	242	req->priv = priv;
	243
	244	err = op(req);
	245	ahash_op_unaligned_finish(req, err);
	246
	247	return err;
	248	}
	249
	250	static int crypto_ahash_op(struct ahash_request *req,
	251	int (op)(struct ahash_request ))
	252	{
	253	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	254	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	255
	256	if ((unsigned long)req->result & alignmask)
	257	return ahash_op_unaligned(req, op);
	258
	259	return op(req);
	260	}
	261
	262	int crypto_ahash_final(struct ahash_request *req)
	263	{
	264	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
	265	}
	266	EXPORT_SYMBOL_GPL(crypto_ahash_final);
	267
	268	int crypto_ahash_finup(struct ahash_request *req)
	269	{
	270	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
	271	}
	272	EXPORT_SYMBOL_GPL(crypto_ahash_finup);
	273
	274	int crypto_ahash_digest(struct ahash_request *req)
	275	{
	276	return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
	277	}
	278	EXPORT_SYMBOL_GPL(crypto_ahash_digest);
	279
	280	static void ahash_def_finup_finish2(struct ahash_request *req, int err)
	281	{
	282	struct ahash_request_priv *priv = req->priv;
	283
	284	if (err == -EINPROGRESS)
	285	return;
	286
	287	if (!err)
	288	memcpy(priv->result, req->result,
	289	crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
	290
	291	kzfree(priv);
	292	}
	293
	294	static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
	295	{
296	struct ahash_request *areq = req->data;
297	struct ahash_request_priv *priv = areq->priv;
298	crypto_completion_t complete = priv->complete;
299	void *data = priv->data;
300
301	ahash_def_finup_finish2(areq, err);
302
303	complete(data, err);
304	}
305
306	static int ahash_def_finup_finish1(struct ahash_request *req, int err)
307	{
308	if (err)
309	goto out;
310
311	req->base.complete = ahash_def_finup_done2;
312	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
313	err = crypto_ahash_reqtfm(req)->final(req);
314
315	out:
316	ahash_def_finup_finish2(req, err);
317	return err;
318	}
319
320	static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
321	{
322	struct ahash_request *areq = req->data;
323	struct ahash_request_priv *priv = areq->priv;
324	crypto_completion_t complete = priv->complete;
325	void *data = priv->data;
326
327	err = ahash_def_finup_finish1(areq, err);
328
329	complete(data, err);
330	}
331
332	static int ahash_def_finup(struct ahash_request *req)
333	{
334	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
335	unsigned long alignmask = crypto_ahash_alignmask(tfm);
336	unsigned int ds = crypto_ahash_digestsize(tfm);
337	struct ahash_request_priv *priv;
338
339	priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
340	(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a	341	GFP_KERNEL : GFP_ATOMIC);
66f6ce5e HX	342	if (!priv)
	343	return -ENOMEM;
	344
	345	priv->result = req->result;
	346	priv->complete = req->base.complete;
	347	priv->data = req->base.data;
	348
	349	req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
	350	req->base.complete = ahash_def_finup_done1;
	351	req->base.data = req;
	352	req->priv = priv;
	353
	354	return ahash_def_finup_finish1(req, tfm->update(req));
	355	}
	356
	357	static int ahash_no_export(struct ahash_request req, void out)
	358	{
	359	return -ENOSYS;
	360	}
	361
	362	static int ahash_no_import(struct ahash_request req, const void in)
	363	{
	364	return -ENOSYS;
	365	}
	366
88056ec3 HX	367	static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
	368	{
	369	struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
	370	struct ahash_alg *alg = crypto_ahash_alg(hash);
88056ec3	371
66f6ce5e	372	hash->setkey = ahash_nosetkey;
7040a842	373	hash->has_setkey = false;
66f6ce5e HX	374	hash->export = ahash_no_export;
	375	hash->import = ahash_no_import;
	376
88056ec3 HX	377	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
	378	return crypto_init_shash_ops_async(tfm);
	379
88056ec3 HX	380	hash->init = alg->init;
88056ec3 HX	381	hash->update = alg->update;
66f6ce5e HX	382	hash->final = alg->final;
66f6ce5e HX	383	hash->finup = alg->finup ?: ahash_def_finup;
88056ec3	384	hash->digest = alg->digest;
66f6ce5e	385
7040a842	386	if (alg->setkey) {
66f6ce5e	387	hash->setkey = alg->setkey;
7040a842 HX	388	hash->has_setkey = true;
7040a842 HX	389	}
66f6ce5e HX	390	if (alg->export)
	391	hash->export = alg->export;
	392	if (alg->import)
	393	hash->import = alg->import;
88056ec3 HX	394
	395	return 0;
	396	}
	397
	398	static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
	399	{
	400	if (alg->cra_type == &crypto_ahash_type)
	401	return alg->cra_ctxsize;
	402
	403	return sizeof(struct crypto_shash *);
	404	}
	405
3acc8473	406	#ifdef CONFIG_NET
6238cbae SK	407	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	408	{
	409	struct crypto_report_hash rhash;
	410
9a5467bf	411	strncpy(rhash.type, "ahash", sizeof(rhash.type));
6238cbae SK	412
	413	rhash.blocksize = alg->cra_blocksize;
	414	rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
	415
6662df33 DM	416	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
	417	sizeof(struct crypto_report_hash), &rhash))
	418	goto nla_put_failure;
6238cbae SK	419	return 0;
	420
	421	nla_put_failure:
	422	return -EMSGSIZE;
	423	}
3acc8473 HX	424	#else
	425	static int crypto_ahash_report(struct sk_buff skb, struct crypto_alg alg)
	426	{
	427	return -ENOSYS;
	428	}
	429	#endif
6238cbae	430
004a403c LH	431	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	432	__attribute__ ((unused));
	433	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	434	{
	435	seq_printf(m, "type : ahash\n");
	436	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	437	"yes" : "no");
	438	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
88056ec3 HX	439	seq_printf(m, "digestsize : %u\n",
88056ec3 HX	440	__crypto_hash_alg_common(alg)->digestsize);
004a403c LH	441	}
	442
	443	const struct crypto_type crypto_ahash_type = {
88056ec3 HX	444	.extsize = crypto_ahash_extsize,
88056ec3 HX	445	.init_tfm = crypto_ahash_init_tfm,
004a403c LH	446	#ifdef CONFIG_PROC_FS
	447	.show = crypto_ahash_show,
	448	#endif
6238cbae	449	.report = crypto_ahash_report,
88056ec3 HX	450	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	451	.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
	452	.type = CRYPTO_ALG_TYPE_AHASH,
	453	.tfmsize = offsetof(struct crypto_ahash, base),
004a403c LH	454	};
	455	EXPORT_SYMBOL_GPL(crypto_ahash_type);
	456
88056ec3 HX	457	struct crypto_ahash crypto_alloc_ahash(const char alg_name, u32 type,
	458	u32 mask)
	459	{
	460	return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
	461	}
	462	EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
	463
01c2dece HX	464	static int ahash_prepare_alg(struct ahash_alg *alg)
	465	{
	466	struct crypto_alg *base = &alg->halg.base;
	467
	468	if (alg->halg.digestsize > PAGE_SIZE / 8 \|\|
2aafe811 RK	469	alg->halg.statesize > PAGE_SIZE / 8 \|\|
2aafe811 RK	470	alg->halg.statesize == 0)
01c2dece HX	471	return -EINVAL;
	472
	473	base->cra_type = &crypto_ahash_type;
	474	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	475	base->cra_flags \|= CRYPTO_ALG_TYPE_AHASH;
	476
	477	return 0;
	478	}
	479
	480	int crypto_register_ahash(struct ahash_alg *alg)
	481	{
	482	struct crypto_alg *base = &alg->halg.base;
	483	int err;
	484
	485	err = ahash_prepare_alg(alg);
	486	if (err)
	487	return err;
	488
	489	return crypto_register_alg(base);
	490	}
	491	EXPORT_SYMBOL_GPL(crypto_register_ahash);
	492
	493	int crypto_unregister_ahash(struct ahash_alg *alg)
	494	{
	495	return crypto_unregister_alg(&alg->halg.base);
	496	}
	497	EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
	498
	499	int ahash_register_instance(struct crypto_template *tmpl,
	500	struct ahash_instance *inst)
	501	{
	502	int err;
	503
	504	err = ahash_prepare_alg(&inst->alg);
	505	if (err)
	506	return err;
	507
	508	return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
	509	}
	510	EXPORT_SYMBOL_GPL(ahash_register_instance);
	511
	512	void ahash_free_instance(struct crypto_instance *inst)
	513	{
	514	crypto_drop_spawn(crypto_instance_ctx(inst));
	515	kfree(ahash_instance(inst));
	516	}
	517	EXPORT_SYMBOL_GPL(ahash_free_instance);
	518
	519	int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
	520	struct hash_alg_common *alg,
	521	struct crypto_instance *inst)
	522	{
	523	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	524	&crypto_ahash_type);
	525	}
	526	EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
	527
	528	struct hash_alg_common ahash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	529	{
	530	struct crypto_alg *alg;
	531
	532	alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
	533	return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
	534	}
535	EXPORT_SYMBOL_GPL(ahash_attr_alg);
536
004a403c LH	537	MODULE_LICENSE("GPL");
004a403c LH	538	MODULE_DESCRIPTION("Asynchronous cryptographic hash type");