[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 "internal.h"

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;

	walk->offset = 0;

	if (nbytes)
		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);

static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
				unsigned int keylen)
{
	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = ahash->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
			unsigned int keylen)
{
	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
	unsigned long alignmask = crypto_ahash_alignmask(tfm);

	if ((unsigned long)key & alignmask)
		return ahash_setkey_unaligned(tfm, key, keylen);

	return ahash->setkey(tfm, key, keylen);
}

int crypto_ahash_import(struct ahash_request *req, const u8 *in)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ahash_alg *alg = crypto_ahash_alg(tfm);

	memcpy(ahash_request_ctx(req), in, crypto_ahash_reqsize(tfm));

	if (alg->reinit)
		alg->reinit(req);

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_ahash_import);

static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type,
					u32 mask)
{
	return alg->cra_ctxsize;
}

static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
	struct ahash_tfm *crt   = &tfm->crt_ahash;

	if (alg->digestsize > PAGE_SIZE / 8)
		return -EINVAL;

	crt->init = alg->init;
	crt->update = alg->update;
	crt->final  = alg->final;
	crt->digest = alg->digest;
	crt->setkey = ahash_setkey;
	crt->digestsize = alg->digestsize;

	return 0;
}

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", alg->cra_hash.digestsize);
}

const struct crypto_type crypto_ahash_type = {
	.ctxsize = crypto_ahash_ctxsize,
	.init = crypto_init_ahash_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_ahash_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_ahash_type);

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
20036252 HX	27	static int hash_walk_next(struct crypto_hash_walk *walk)
	28	{
	29	unsigned int alignmask = walk->alignmask;
	30	unsigned int offset = walk->offset;
	31	unsigned int nbytes = min(walk->entrylen,
	32	((unsigned int)(PAGE_SIZE)) - offset);
	33
	34	walk->data = crypto_kmap(walk->pg, 0);
	35	walk->data += offset;
	36
	37	if (offset & alignmask)
	38	nbytes = alignmask + 1 - (offset & alignmask);
	39
	40	walk->entrylen -= nbytes;
	41	return nbytes;
	42	}
	43
	44	static int hash_walk_new_entry(struct crypto_hash_walk *walk)
	45	{
	46	struct scatterlist *sg;
	47
	48	sg = walk->sg;
	49	walk->pg = sg_page(sg);
	50	walk->offset = sg->offset;
	51	walk->entrylen = sg->length;
	52
	53	if (walk->entrylen > walk->total)
	54	walk->entrylen = walk->total;
	55	walk->total -= walk->entrylen;
	56
	57	return hash_walk_next(walk);
	58	}
	59
	60	int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
	61	{
	62	unsigned int alignmask = walk->alignmask;
	63	unsigned int nbytes = walk->entrylen;
	64
	65	walk->data -= walk->offset;
	66
	67	if (nbytes && walk->offset & alignmask && !err) {
	68	walk->offset += alignmask - 1;
	69	walk->offset = ALIGN(walk->offset, alignmask + 1);
	70	walk->data += walk->offset;
	71
	72	nbytes = min(nbytes,
	73	((unsigned int)(PAGE_SIZE)) - walk->offset);
	74	walk->entrylen -= nbytes;
	75
	76	return nbytes;
	77	}
	78
	79	crypto_kunmap(walk->data, 0);
	80	crypto_yield(walk->flags);
	81
	82	if (err)
	83	return err;
	84
	85	walk->offset = 0;
	86
	87	if (nbytes)
	88	return hash_walk_next(walk);
	89
	90	if (!walk->total)
91	return 0;
92
93	walk->sg = scatterwalk_sg_next(walk->sg);
94
95	return hash_walk_new_entry(walk);
96	}
97	EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
98
99	int crypto_hash_walk_first(struct ahash_request *req,
100	struct crypto_hash_walk *walk)
101	{
102	walk->total = req->nbytes;
103
104	if (!walk->total)
105	return 0;
106
107	walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
108	walk->sg = req->src;
109	walk->flags = req->base.flags;
110
111	return hash_walk_new_entry(walk);
112	}
113	EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
114
004a403c LH	115	static int ahash_setkey_unaligned(struct crypto_ahash tfm, const u8 key,
	116	unsigned int keylen)
	117	{
	118	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
	119	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	120	int ret;
	121	u8 buffer, alignbuffer;
	122	unsigned long absize;
	123
	124	absize = keylen + alignmask;
	125	buffer = kmalloc(absize, GFP_ATOMIC);
	126	if (!buffer)
	127	return -ENOMEM;
	128
	129	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	130	memcpy(alignbuffer, key, keylen);
	131	ret = ahash->setkey(tfm, alignbuffer, keylen);
	132	memset(alignbuffer, 0, keylen);
	133	kfree(buffer);
	134	return ret;
	135	}
	136
	137	static int ahash_setkey(struct crypto_ahash tfm, const u8 key,
	138	unsigned int keylen)
	139	{
	140	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
	141	unsigned long alignmask = crypto_ahash_alignmask(tfm);
	142
	143	if ((unsigned long)key & alignmask)
	144	return ahash_setkey_unaligned(tfm, key, keylen);
	145
	146	return ahash->setkey(tfm, key, keylen);
	147	}
	148
dec8b786 HX	149	int crypto_ahash_import(struct ahash_request req, const u8 in)
	150	{
	151	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	152	struct ahash_alg *alg = crypto_ahash_alg(tfm);
	153
	154	memcpy(ahash_request_ctx(req), in, crypto_ahash_reqsize(tfm));
	155
	156	if (alg->reinit)
	157	alg->reinit(req);
	158
	159	return 0;
	160	}
	161	EXPORT_SYMBOL_GPL(crypto_ahash_import);
	162
004a403c LH	163	static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type,
	164	u32 mask)
	165	{
	166	return alg->cra_ctxsize;
	167	}
	168
	169	static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	170	{
	171	struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
	172	struct ahash_tfm *crt = &tfm->crt_ahash;
	173
ca786dc7	174	if (alg->digestsize > PAGE_SIZE / 8)
004a403c LH	175	return -EINVAL;
	176
	177	crt->init = alg->init;
	178	crt->update = alg->update;
	179	crt->final = alg->final;
	180	crt->digest = alg->digest;
	181	crt->setkey = ahash_setkey;
004a403c LH	182	crt->digestsize = alg->digestsize;
	183
	184	return 0;
	185	}
	186
	187	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	188	__attribute__ ((unused));
	189	static void crypto_ahash_show(struct seq_file m, struct crypto_alg alg)
	190	{
	191	seq_printf(m, "type : ahash\n");
	192	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	193	"yes" : "no");
	194	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	195	seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
	196	}
	197
	198	const struct crypto_type crypto_ahash_type = {
	199	.ctxsize = crypto_ahash_ctxsize,
	200	.init = crypto_init_ahash_ops,
	201	#ifdef CONFIG_PROC_FS
	202	.show = crypto_ahash_show,
	203	#endif
	204	};
	205	EXPORT_SYMBOL_GPL(crypto_ahash_type);
	206
	207	MODULE_LICENSE("GPL");
	208	MODULE_DESCRIPTION("Asynchronous cryptographic hash type");