[linux-2.6-block.git] / crypto / shash.c

/*
 * Synchronous Cryptographic Hash operations.
 *
 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * 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/scatterwalk.h>
#include <crypto/internal/hash.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>

#include "internal.h"

static const struct crypto_type crypto_shash_type;

static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
			   unsigned int keylen)
{
	return -ENOSYS;
}

static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
				  unsigned int keylen)
{
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	unsigned long absize;
	u8 *buffer, *alignbuffer;
	int err;

	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
	buffer = kmalloc(absize, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	err = shash->setkey(tfm, alignbuffer, keylen);
	kzfree(buffer);
	return err;
}

int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
			unsigned int keylen)
{
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

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

	return shash->setkey(tfm, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_shash_setkey);

static inline unsigned int shash_align_buffer_size(unsigned len,
						   unsigned long mask)
{
	typedef u8 __attribute__ ((aligned)) u8_aligned;
	return len + (mask & ~(__alignof__(u8_aligned) - 1));
}

static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
				  unsigned int len)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	unsigned int unaligned_len = alignmask + 1 -
				     ((unsigned long)data & alignmask);
	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
		__attribute__ ((aligned));
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	if (unaligned_len > len)
		unaligned_len = len;

	memcpy(buf, data, unaligned_len);
	err = shash->update(desc, buf, unaligned_len);
	memset(buf, 0, unaligned_len);

	return err ?:
	       shash->update(desc, data + unaligned_len, len - unaligned_len);
}

int crypto_shash_update(struct shash_desc *desc, const u8 *data,
			unsigned int len)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)data & alignmask)
		return shash_update_unaligned(desc, data, len);

	return shash->update(desc, data, len);
}
EXPORT_SYMBOL_GPL(crypto_shash_update);

static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned int ds = crypto_shash_digestsize(tfm);
	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
		__attribute__ ((aligned));
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	err = shash->final(desc, buf);
	if (err)
		goto out;

	memcpy(out, buf, ds);

out:
	memset(buf, 0, ds);
	return err;
}

int crypto_shash_final(struct shash_desc *desc, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)out & alignmask)
		return shash_final_unaligned(desc, out);

	return shash->final(desc, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_final);

static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
				 unsigned int len, u8 *out)
{
	return crypto_shash_update(desc, data, len) ?:
	       crypto_shash_final(desc, out);
}

int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
		       unsigned int len, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if (((unsigned long)data | (unsigned long)out) & alignmask)
		return shash_finup_unaligned(desc, data, len, out);

	return shash->finup(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_finup);

static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
				  unsigned int len, u8 *out)
{
	return crypto_shash_init(desc) ?:
	       crypto_shash_finup(desc, data, len, out);
}

int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if (((unsigned long)data | (unsigned long)out) & alignmask)
		return shash_digest_unaligned(desc, data, len, out);

	return shash->digest(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_digest);

static int shash_default_export(struct shash_desc *desc, void *out)
{
	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
	return 0;
}

static int shash_default_import(struct shash_desc *desc, const void *in)
{
	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
	return 0;
}

static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
			      unsigned int keylen)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);

	return crypto_shash_setkey(*ctx, key, keylen);
}

static int shash_async_init(struct ahash_request *req)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return crypto_shash_init(desc);
}

int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
{
	struct crypto_hash_walk walk;
	int nbytes;

	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	     nbytes = crypto_hash_walk_done(&walk, nbytes))
		nbytes = crypto_shash_update(desc, walk.data, nbytes);

	return nbytes;
}
EXPORT_SYMBOL_GPL(shash_ahash_update);

static int shash_async_update(struct ahash_request *req)
{
	return shash_ahash_update(req, ahash_request_ctx(req));
}

static int shash_async_final(struct ahash_request *req)
{
	return crypto_shash_final(ahash_request_ctx(req), req->result);
}

int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
{
	struct crypto_hash_walk walk;
	int nbytes;

	nbytes = crypto_hash_walk_first(req, &walk);
	if (!nbytes)
		return crypto_shash_final(desc, req->result);

	do {
		nbytes = crypto_hash_walk_last(&walk) ?
			 crypto_shash_finup(desc, walk.data, nbytes,
					    req->result) :
			 crypto_shash_update(desc, walk.data, nbytes);
		nbytes = crypto_hash_walk_done(&walk, nbytes);
	} while (nbytes > 0);

	return nbytes;
}
EXPORT_SYMBOL_GPL(shash_ahash_finup);

static int shash_async_finup(struct ahash_request *req)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return shash_ahash_finup(req, desc);
}

int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
{
	struct scatterlist *sg = req->src;
	unsigned int offset = sg->offset;
	unsigned int nbytes = req->nbytes;
	int err;

	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
		void *data;

		data = kmap_atomic(sg_page(sg));
		err = crypto_shash_digest(desc, data + offset, nbytes,
					  req->result);
		kunmap_atomic(data);
		crypto_yield(desc->flags);
	} else
		err = crypto_shash_init(desc) ?:
		      shash_ahash_finup(req, desc);

	return err;
}
EXPORT_SYMBOL_GPL(shash_ahash_digest);

static int shash_async_digest(struct ahash_request *req)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return shash_ahash_digest(req, desc);
}

static int shash_async_export(struct ahash_request *req, void *out)
{
	return crypto_shash_export(ahash_request_ctx(req), out);
}

static int shash_async_import(struct ahash_request *req, const void *in)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return crypto_shash_import(desc, in);
}

static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);

	crypto_free_shash(*ctx);
}

int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_alg *calg = tfm->__crt_alg;
	struct shash_alg *alg = __crypto_shash_alg(calg);
	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	struct crypto_shash *shash;

	if (!crypto_mod_get(calg))
		return -EAGAIN;

	shash = crypto_create_tfm(calg, &crypto_shash_type);
	if (IS_ERR(shash)) {
		crypto_mod_put(calg);
		return PTR_ERR(shash);
	}

	*ctx = shash;
	tfm->exit = crypto_exit_shash_ops_async;

	crt->init = shash_async_init;
	crt->update = shash_async_update;
	crt->final = shash_async_final;
	crt->finup = shash_async_finup;
	crt->digest = shash_async_digest;
	crt->setkey = shash_async_setkey;

	crt->has_setkey = alg->setkey != shash_no_setkey;

	if (alg->export)
		crt->export = shash_async_export;
	if (alg->import)
		crt->import = shash_async_import;

	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);

	return 0;
}

static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_shash *hash = __crypto_shash_cast(tfm);

	hash->descsize = crypto_shash_alg(hash)->descsize;
	return 0;
}

#ifdef CONFIG_NET
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_hash rhash;
	struct shash_alg *salg = __crypto_shash_alg(alg);

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

	rhash.blocksize = alg->cra_blocksize;
	rhash.digestsize = salg->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_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct shash_alg *salg = __crypto_shash_alg(alg);

	seq_printf(m, "type         : shash\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
}

static const struct crypto_type crypto_shash_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_shash_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_shash_show,
#endif
	.report = crypto_shash_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SHASH,
	.tfmsize = offsetof(struct crypto_shash, base),
};

struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
					u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_shash);

static int shash_prepare_alg(struct shash_alg *alg)
{
	struct crypto_alg *base = &alg->base;

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

	base->cra_type = &crypto_shash_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;

	if (!alg->finup)
		alg->finup = shash_finup_unaligned;
	if (!alg->digest)
		alg->digest = shash_digest_unaligned;
	if (!alg->export) {
		alg->export = shash_default_export;
		alg->import = shash_default_import;
		alg->statesize = alg->descsize;
	}
	if (!alg->setkey)
		alg->setkey = shash_no_setkey;

	return 0;
}

int crypto_register_shash(struct shash_alg *alg)
{
	struct crypto_alg *base = &alg->base;
	int err;

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

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

int crypto_unregister_shash(struct shash_alg *alg)
{
	return crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_shash);

int crypto_register_shashes(struct shash_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_shash(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_shash(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_shashes);

int crypto_unregister_shashes(struct shash_alg *algs, int count)
{
	int i, ret;

	for (i = count - 1; i >= 0; --i) {
		ret = crypto_unregister_shash(&algs[i]);
		if (ret)
			pr_err("Failed to unregister %s %s: %d\n",
			       algs[i].base.cra_driver_name,
			       algs[i].base.cra_name, ret);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_shashes);

int shash_register_instance(struct crypto_template *tmpl,
			    struct shash_instance *inst)
{
	int err;

	err = shash_prepare_alg(&inst->alg);
	if (err)
		return err;

	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_register_instance);

void shash_free_instance(struct crypto_instance *inst)
{
	crypto_drop_spawn(crypto_instance_ctx(inst));
	kfree(shash_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_free_instance);

int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
			    struct shash_alg *alg,
			    struct crypto_instance *inst)
{
	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
				  &crypto_shash_type);
}
EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);

struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	return IS_ERR(alg) ? ERR_CAST(alg) :
	       container_of(alg, struct shash_alg, base);
}
EXPORT_SYMBOL_GPL(shash_attr_alg);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous cryptographic hash type");
Commit	Line	Data
7b5a080b HX	1	/*
	2	* Synchronous Cryptographic Hash operations.
	3	*
	4	* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
3b2f6df0	13	#include <crypto/scatterwalk.h>
7b5a080b HX	14	#include <crypto/internal/hash.h>
	15	#include <linux/err.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/slab.h>
	19	#include <linux/seq_file.h>
f4d663ce SK	20	#include <linux/cryptouser.h>
f4d663ce SK	21	#include <net/netlink.h>
7b5a080b	22
3b2f6df0 HX	23	#include "internal.h"
3b2f6df0 HX	24
3f683d61 HX	25	static const struct crypto_type crypto_shash_type;
3f683d61 HX	26
57cfe44b HX	27	static int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	28	unsigned int keylen)
	29	{
	30	return -ENOSYS;
	31	}
	32
7b5a080b HX	33	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	34	unsigned int keylen)
	35	{
	36	struct shash_alg *shash = crypto_shash_alg(tfm);
	37	unsigned long alignmask = crypto_shash_alignmask(tfm);
	38	unsigned long absize;
	39	u8 buffer, alignbuffer;
	40	int err;
	41
18eb8ea6	42	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
7b5a080b HX	43	buffer = kmalloc(absize, GFP_KERNEL);
	44	if (!buffer)
	45	return -ENOMEM;
	46
	47	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	48	memcpy(alignbuffer, key, keylen);
	49	err = shash->setkey(tfm, alignbuffer, keylen);
8c32c516	50	kzfree(buffer);
7b5a080b HX	51	return err;
	52	}
	53
	54	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	55	unsigned int keylen)
	56	{
	57	struct shash_alg *shash = crypto_shash_alg(tfm);
	58	unsigned long alignmask = crypto_shash_alignmask(tfm);
	59
	60	if ((unsigned long)key & alignmask)
	61	return shash_setkey_unaligned(tfm, key, keylen);
	62
	63	return shash->setkey(tfm, key, keylen);
	64	}
	65	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	66
	67	static inline unsigned int shash_align_buffer_size(unsigned len,
	68	unsigned long mask)
	69	{
66d8ea57 MC	70	typedef u8 __attribute__ ((aligned)) u8_aligned;
66d8ea57 MC	71	return len + (mask & ~(__alignof__(u8_aligned) - 1));
7b5a080b HX	72	}
	73
	74	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	75	unsigned int len)
	76	{
	77	struct crypto_shash *tfm = desc->tfm;
	78	struct shash_alg *shash = crypto_shash_alg(tfm);
	79	unsigned long alignmask = crypto_shash_alignmask(tfm);
	80	unsigned int unaligned_len = alignmask + 1 -
	81	((unsigned long)data & alignmask);
0e2d3a12	82	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
7b5a080b	83	__attribute__ ((aligned));
0e2d3a12	84	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	85	int err;
7b5a080b	86
f4f68993 YS	87	if (unaligned_len > len)
	88	unaligned_len = len;
	89
7b5a080b	90	memcpy(buf, data, unaligned_len);
8c32c516 HX	91	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	92	memset(buf, 0, unaligned_len);
7b5a080b	93
8c32c516	94	return err ?:
7b5a080b HX	95	shash->update(desc, data + unaligned_len, len - unaligned_len);
	96	}
	97
	98	int crypto_shash_update(struct shash_desc desc, const u8 data,
	99	unsigned int len)
	100	{
	101	struct crypto_shash *tfm = desc->tfm;
	102	struct shash_alg *shash = crypto_shash_alg(tfm);
	103	unsigned long alignmask = crypto_shash_alignmask(tfm);
	104
	105	if ((unsigned long)data & alignmask)
	106	return shash_update_unaligned(desc, data, len);
	107
	108	return shash->update(desc, data, len);
	109	}
	110	EXPORT_SYMBOL_GPL(crypto_shash_update);
	111
	112	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	113	{
	114	struct crypto_shash *tfm = desc->tfm;
	115	unsigned long alignmask = crypto_shash_alignmask(tfm);
	116	struct shash_alg *shash = crypto_shash_alg(tfm);
	117	unsigned int ds = crypto_shash_digestsize(tfm);
0e2d3a12	118	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
7b5a080b	119	__attribute__ ((aligned));
0e2d3a12	120	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	121	int err;
	122
	123	err = shash->final(desc, buf);
8c32c516 HX	124	if (err)
	125	goto out;
	126
7b5a080b	127	memcpy(out, buf, ds);
8c32c516 HX	128
	129	out:
	130	memset(buf, 0, ds);
7b5a080b HX	131	return err;
	132	}
	133
	134	int crypto_shash_final(struct shash_desc desc, u8 out)
	135	{
	136	struct crypto_shash *tfm = desc->tfm;
	137	struct shash_alg *shash = crypto_shash_alg(tfm);
	138	unsigned long alignmask = crypto_shash_alignmask(tfm);
	139
	140	if ((unsigned long)out & alignmask)
	141	return shash_final_unaligned(desc, out);
	142
	143	return shash->final(desc, out);
	144	}
	145	EXPORT_SYMBOL_GPL(crypto_shash_final);
	146
	147	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	148	unsigned int len, u8 *out)
	149	{
	150	return crypto_shash_update(desc, data, len) ?:
	151	crypto_shash_final(desc, out);
	152	}
	153
	154	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	155	unsigned int len, u8 *out)
	156	{
	157	struct crypto_shash *tfm = desc->tfm;
	158	struct shash_alg *shash = crypto_shash_alg(tfm);
	159	unsigned long alignmask = crypto_shash_alignmask(tfm);
	160
8267adab	161	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	162	return shash_finup_unaligned(desc, data, len, out);
	163
	164	return shash->finup(desc, data, len, out);
	165	}
	166	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	167
	168	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	169	unsigned int len, u8 *out)
	170	{
	171	return crypto_shash_init(desc) ?:
f88ad8de	172	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	173	}
	174
	175	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	176	unsigned int len, u8 *out)
	177	{
	178	struct crypto_shash *tfm = desc->tfm;
	179	struct shash_alg *shash = crypto_shash_alg(tfm);
	180	unsigned long alignmask = crypto_shash_alignmask(tfm);
	181
8267adab	182	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	183	return shash_digest_unaligned(desc, data, len, out);
	184
	185	return shash->digest(desc, data, len, out);
	186	}
	187	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	188
f592682f	189	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	190	{
f592682f HX	191	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	192	return 0;
99d27e1c	193	}
dec8b786	194
f592682f	195	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	196	{
f592682f HX	197	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	198	return 0;
dec8b786	199	}
dec8b786	200
3b2f6df0 HX	201	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	202	unsigned int keylen)
	203	{
	204	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	205
	206	return crypto_shash_setkey(*ctx, key, keylen);
	207	}
	208
	209	static int shash_async_init(struct ahash_request *req)
	210	{
	211	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	212	struct shash_desc *desc = ahash_request_ctx(req);
	213
	214	desc->tfm = *ctx;
	215	desc->flags = req->base.flags;
	216
	217	return crypto_shash_init(desc);
	218	}
	219
7eddf95e	220	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	221	{
3b2f6df0 HX	222	struct crypto_hash_walk walk;
	223	int nbytes;
	224
	225	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	226	nbytes = crypto_hash_walk_done(&walk, nbytes))
	227	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	228
	229	return nbytes;
	230	}
7eddf95e HX	231	EXPORT_SYMBOL_GPL(shash_ahash_update);
	232
	233	static int shash_async_update(struct ahash_request *req)
	234	{
	235	return shash_ahash_update(req, ahash_request_ctx(req));
	236	}
3b2f6df0 HX	237
	238	static int shash_async_final(struct ahash_request *req)
	239	{
	240	return crypto_shash_final(ahash_request_ctx(req), req->result);
	241	}
	242
66f6ce5e HX	243	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	244	{
	245	struct crypto_hash_walk walk;
	246	int nbytes;
	247
cbc86b91 HX	248	nbytes = crypto_hash_walk_first(req, &walk);
	249	if (!nbytes)
	250	return crypto_shash_final(desc, req->result);
	251
	252	do {
66f6ce5e HX	253	nbytes = crypto_hash_walk_last(&walk) ?
	254	crypto_shash_finup(desc, walk.data, nbytes,
	255	req->result) :
	256	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	257	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	258	} while (nbytes > 0);
66f6ce5e HX	259
	260	return nbytes;
	261	}
	262	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	263
	264	static int shash_async_finup(struct ahash_request *req)
	265	{
	266	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	267	struct shash_desc *desc = ahash_request_ctx(req);
	268
	269	desc->tfm = *ctx;
	270	desc->flags = req->base.flags;
	271
	272	return shash_ahash_finup(req, desc);
	273	}
	274
7eddf95e	275	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0 HX	276	{
	277	struct scatterlist *sg = req->src;
	278	unsigned int offset = sg->offset;
	279	unsigned int nbytes = req->nbytes;
	280	int err;
	281
	282	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
3b2f6df0 HX	283	void *data;
3b2f6df0 HX	284
f0dfc0b0	285	data = kmap_atomic(sg_page(sg));
3b2f6df0 HX	286	err = crypto_shash_digest(desc, data + offset, nbytes,
3b2f6df0 HX	287	req->result);
f0dfc0b0	288	kunmap_atomic(data);
3b2f6df0	289	crypto_yield(desc->flags);
7eddf95e HX	290	} else
7eddf95e HX	291	err = crypto_shash_init(desc) ?:
66f6ce5e	292	shash_ahash_finup(req, desc);
3b2f6df0	293
7eddf95e HX	294	return err;
	295	}
	296	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	297
7eddf95e HX	298	static int shash_async_digest(struct ahash_request *req)
	299	{
	300	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	301	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	302
7eddf95e HX	303	desc->tfm = *ctx;
7eddf95e HX	304	desc->flags = req->base.flags;
3b2f6df0	305
7eddf95e	306	return shash_ahash_digest(req, desc);
3b2f6df0 HX	307	}
3b2f6df0 HX	308
66f6ce5e HX	309	static int shash_async_export(struct ahash_request req, void out)
	310	{
	311	return crypto_shash_export(ahash_request_ctx(req), out);
	312	}
	313
	314	static int shash_async_import(struct ahash_request req, const void in)
	315	{
90246e79 HX	316	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	317	struct shash_desc *desc = ahash_request_ctx(req);
	318
	319	desc->tfm = *ctx;
	320	desc->flags = req->base.flags;
	321
	322	return crypto_shash_import(desc, in);
66f6ce5e HX	323	}
66f6ce5e HX	324
3b2f6df0 HX	325	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	326	{
	327	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	328
	329	crypto_free_shash(*ctx);
	330	}
	331
88056ec3	332	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	333	{
3b2f6df0 HX	334	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	335	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	336	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	337	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	338	struct crypto_shash *shash;
	339
	340	if (!crypto_mod_get(calg))
	341	return -EAGAIN;
	342
3f683d61	343	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	344	if (IS_ERR(shash)) {
	345	crypto_mod_put(calg);
	346	return PTR_ERR(shash);
	347	}
	348
	349	*ctx = shash;
	350	tfm->exit = crypto_exit_shash_ops_async;
	351
	352	crt->init = shash_async_init;
	353	crt->update = shash_async_update;
66f6ce5e HX	354	crt->final = shash_async_final;
66f6ce5e HX	355	crt->finup = shash_async_finup;
3b2f6df0	356	crt->digest = shash_async_digest;
00420a65 HX	357	crt->setkey = shash_async_setkey;
	358
	359	crt->has_setkey = alg->setkey != shash_no_setkey;
66f6ce5e	360
66f6ce5e HX	361	if (alg->export)
66f6ce5e HX	362	crt->export = shash_async_export;
0044f3ed	363	if (alg->import)
66f6ce5e	364	crt->import = shash_async_import;
3b2f6df0	365
3b2f6df0 HX	366	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	367
	368	return 0;
	369	}
	370
2ca33da1	371	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	372	{
113adefc HX	373	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	374
	375	hash->descsize = crypto_shash_alg(hash)->descsize;
7b5a080b HX	376	return 0;
	377	}
	378
3acc8473	379	#ifdef CONFIG_NET
f4d663ce SK	380	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	381	{
	382	struct crypto_report_hash rhash;
	383	struct shash_alg *salg = __crypto_shash_alg(alg);
	384
9a5467bf MK	385	strncpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf MK	386
f4d663ce SK	387	rhash.blocksize = alg->cra_blocksize;
	388	rhash.digestsize = salg->digestsize;
	389
6662df33 DM	390	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
	391	sizeof(struct crypto_report_hash), &rhash))
	392	goto nla_put_failure;
f4d663ce SK	393	return 0;
	394
	395	nla_put_failure:
	396	return -EMSGSIZE;
	397	}
3acc8473 HX	398	#else
	399	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	400	{
	401	return -ENOSYS;
	402	}
	403	#endif
f4d663ce	404
7b5a080b HX	405	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	406	__attribute__ ((unused));
	407	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	408	{
	409	struct shash_alg *salg = __crypto_shash_alg(alg);
	410
	411	seq_printf(m, "type : shash\n");
	412	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	413	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	414	}
	415
	416	static const struct crypto_type crypto_shash_type = {
ac611680	417	.extsize = crypto_alg_extsize,
7b5a080b HX	418	.init_tfm = crypto_shash_init_tfm,
	419	#ifdef CONFIG_PROC_FS
	420	.show = crypto_shash_show,
	421	#endif
f4d663ce	422	.report = crypto_shash_report,
7b5a080b HX	423	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	424	.maskset = CRYPTO_ALG_TYPE_MASK,
	425	.type = CRYPTO_ALG_TYPE_SHASH,
	426	.tfmsize = offsetof(struct crypto_shash, base),
	427	};
	428
	429	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	430	u32 mask)
	431	{
3f683d61	432	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	433	}
	434	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	435
619a6ebd	436	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	437	{
	438	struct crypto_alg *base = &alg->base;
	439
	440	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	441	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	442	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	443	return -EINVAL;
	444
	445	base->cra_type = &crypto_shash_type;
	446	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	447	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	448
8267adab HX	449	if (!alg->finup)
	450	alg->finup = shash_finup_unaligned;
	451	if (!alg->digest)
	452	alg->digest = shash_digest_unaligned;
f592682f HX	453	if (!alg->export) {
	454	alg->export = shash_default_export;
	455	alg->import = shash_default_import;
	456	alg->statesize = alg->descsize;
	457	}
57cfe44b HX	458	if (!alg->setkey)
57cfe44b HX	459	alg->setkey = shash_no_setkey;
99d27e1c	460
619a6ebd HX	461	return 0;
	462	}
	463
	464	int crypto_register_shash(struct shash_alg *alg)
	465	{
	466	struct crypto_alg *base = &alg->base;
	467	int err;
	468
	469	err = shash_prepare_alg(alg);
	470	if (err)
	471	return err;
7b5a080b HX	472
	473	return crypto_register_alg(base);
	474	}
	475	EXPORT_SYMBOL_GPL(crypto_register_shash);
	476
	477	int crypto_unregister_shash(struct shash_alg *alg)
	478	{
	479	return crypto_unregister_alg(&alg->base);
	480	}
	481	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	482
50fc3e8d JK	483	int crypto_register_shashes(struct shash_alg *algs, int count)
	484	{
	485	int i, ret;
	486
	487	for (i = 0; i < count; i++) {
	488	ret = crypto_register_shash(&algs[i]);
	489	if (ret)
	490	goto err;
	491	}
	492
	493	return 0;
	494
	495	err:
	496	for (--i; i >= 0; --i)
	497	crypto_unregister_shash(&algs[i]);
	498
	499	return ret;
	500	}
	501	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	502
	503	int crypto_unregister_shashes(struct shash_alg *algs, int count)
	504	{
	505	int i, ret;
	506
	507	for (i = count - 1; i >= 0; --i) {
	508	ret = crypto_unregister_shash(&algs[i]);
	509	if (ret)
	510	pr_err("Failed to unregister %s %s: %d\n",
	511	algs[i].base.cra_driver_name,
	512	algs[i].base.cra_name, ret);
	513	}
	514
	515	return 0;
	516	}
	517	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	518
619a6ebd HX	519	int shash_register_instance(struct crypto_template *tmpl,
	520	struct shash_instance *inst)
	521	{
	522	int err;
	523
	524	err = shash_prepare_alg(&inst->alg);
	525	if (err)
	526	return err;
	527
	528	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	529	}
	530	EXPORT_SYMBOL_GPL(shash_register_instance);
	531
2e4fddd8 HX	532	void shash_free_instance(struct crypto_instance *inst)
	533	{
	534	crypto_drop_spawn(crypto_instance_ctx(inst));
	535	kfree(shash_instance(inst));
	536	}
	537	EXPORT_SYMBOL_GPL(shash_free_instance);
	538
94296999 HX	539	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	540	struct shash_alg *alg,
	541	struct crypto_instance *inst)
	542	{
	543	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	544	&crypto_shash_type);
	545	}
	546	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	547
7d6f5640 HX	548	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	549	{
	550	struct crypto_alg *alg;
	551
	552	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	553	return IS_ERR(alg) ? ERR_CAST(alg) :
	554	container_of(alg, struct shash_alg, base);
	555	}
	556	EXPORT_SYMBOL_GPL(shash_attr_alg);
	557
7b5a080b HX	558	MODULE_LICENSE("GPL");
7b5a080b HX	559	MODULE_DESCRIPTION("Synchronous cryptographic hash type");