[mirror_ubuntu-artful-kernel.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 <linux/compiler.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 __aligned_largest 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)]
		__aligned_largest;
	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)]
		__aligned_largest;
	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)
	__maybe_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>
d8c34b94	22	#include <linux/compiler.h>
7b5a080b	23
3b2f6df0 HX	24	#include "internal.h"
3b2f6df0 HX	25
3f683d61 HX	26	static const struct crypto_type crypto_shash_type;
3f683d61 HX	27
57cfe44b HX	28	static int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	29	unsigned int keylen)
	30	{
	31	return -ENOSYS;
	32	}
	33
7b5a080b HX	34	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	35	unsigned int keylen)
	36	{
	37	struct shash_alg *shash = crypto_shash_alg(tfm);
	38	unsigned long alignmask = crypto_shash_alignmask(tfm);
	39	unsigned long absize;
	40	u8 buffer, alignbuffer;
	41	int err;
	42
18eb8ea6	43	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
7b5a080b HX	44	buffer = kmalloc(absize, GFP_KERNEL);
	45	if (!buffer)
	46	return -ENOMEM;
	47
	48	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	49	memcpy(alignbuffer, key, keylen);
	50	err = shash->setkey(tfm, alignbuffer, keylen);
8c32c516	51	kzfree(buffer);
7b5a080b HX	52	return err;
	53	}
	54
	55	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	56	unsigned int keylen)
	57	{
	58	struct shash_alg *shash = crypto_shash_alg(tfm);
	59	unsigned long alignmask = crypto_shash_alignmask(tfm);
	60
	61	if ((unsigned long)key & alignmask)
	62	return shash_setkey_unaligned(tfm, key, keylen);
	63
	64	return shash->setkey(tfm, key, keylen);
	65	}
	66	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	67
	68	static inline unsigned int shash_align_buffer_size(unsigned len,
	69	unsigned long mask)
	70	{
d8c34b94	71	typedef u8 __aligned_largest u8_aligned;
66d8ea57	72	return len + (mask & ~(__alignof__(u8_aligned) - 1));
7b5a080b HX	73	}
	74
	75	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	76	unsigned int len)
	77	{
	78	struct crypto_shash *tfm = desc->tfm;
	79	struct shash_alg *shash = crypto_shash_alg(tfm);
	80	unsigned long alignmask = crypto_shash_alignmask(tfm);
	81	unsigned int unaligned_len = alignmask + 1 -
	82	((unsigned long)data & alignmask);
0e2d3a12	83	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
d8c34b94	84	__aligned_largest;
0e2d3a12	85	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	86	int err;
7b5a080b	87
f4f68993 YS	88	if (unaligned_len > len)
	89	unaligned_len = len;
	90
7b5a080b	91	memcpy(buf, data, unaligned_len);
8c32c516 HX	92	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	93	memset(buf, 0, unaligned_len);
7b5a080b	94
8c32c516	95	return err ?:
7b5a080b HX	96	shash->update(desc, data + unaligned_len, len - unaligned_len);
	97	}
	98
	99	int crypto_shash_update(struct shash_desc desc, const u8 data,
	100	unsigned int len)
	101	{
	102	struct crypto_shash *tfm = desc->tfm;
	103	struct shash_alg *shash = crypto_shash_alg(tfm);
	104	unsigned long alignmask = crypto_shash_alignmask(tfm);
	105
	106	if ((unsigned long)data & alignmask)
	107	return shash_update_unaligned(desc, data, len);
	108
	109	return shash->update(desc, data, len);
	110	}
	111	EXPORT_SYMBOL_GPL(crypto_shash_update);
	112
	113	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	114	{
	115	struct crypto_shash *tfm = desc->tfm;
	116	unsigned long alignmask = crypto_shash_alignmask(tfm);
	117	struct shash_alg *shash = crypto_shash_alg(tfm);
	118	unsigned int ds = crypto_shash_digestsize(tfm);
0e2d3a12	119	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
d8c34b94	120	__aligned_largest;
0e2d3a12	121	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	122	int err;
	123
	124	err = shash->final(desc, buf);
8c32c516 HX	125	if (err)
	126	goto out;
	127
7b5a080b	128	memcpy(out, buf, ds);
8c32c516 HX	129
	130	out:
	131	memset(buf, 0, ds);
7b5a080b HX	132	return err;
	133	}
	134
	135	int crypto_shash_final(struct shash_desc desc, u8 out)
	136	{
	137	struct crypto_shash *tfm = desc->tfm;
	138	struct shash_alg *shash = crypto_shash_alg(tfm);
	139	unsigned long alignmask = crypto_shash_alignmask(tfm);
	140
	141	if ((unsigned long)out & alignmask)
	142	return shash_final_unaligned(desc, out);
	143
	144	return shash->final(desc, out);
	145	}
	146	EXPORT_SYMBOL_GPL(crypto_shash_final);
	147
	148	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	149	unsigned int len, u8 *out)
	150	{
	151	return crypto_shash_update(desc, data, len) ?:
	152	crypto_shash_final(desc, out);
	153	}
	154
	155	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	156	unsigned int len, u8 *out)
	157	{
	158	struct crypto_shash *tfm = desc->tfm;
	159	struct shash_alg *shash = crypto_shash_alg(tfm);
	160	unsigned long alignmask = crypto_shash_alignmask(tfm);
	161
8267adab	162	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	163	return shash_finup_unaligned(desc, data, len, out);
	164
	165	return shash->finup(desc, data, len, out);
	166	}
	167	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	168
	169	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	170	unsigned int len, u8 *out)
	171	{
	172	return crypto_shash_init(desc) ?:
f88ad8de	173	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	174	}
	175
	176	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	177	unsigned int len, u8 *out)
	178	{
	179	struct crypto_shash *tfm = desc->tfm;
	180	struct shash_alg *shash = crypto_shash_alg(tfm);
	181	unsigned long alignmask = crypto_shash_alignmask(tfm);
	182
8267adab	183	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	184	return shash_digest_unaligned(desc, data, len, out);
	185
	186	return shash->digest(desc, data, len, out);
	187	}
	188	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	189
f592682f	190	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	191	{
f592682f HX	192	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	193	return 0;
99d27e1c	194	}
dec8b786	195
f592682f	196	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	197	{
f592682f HX	198	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	199	return 0;
dec8b786	200	}
dec8b786	201
3b2f6df0 HX	202	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	203	unsigned int keylen)
	204	{
	205	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	206
	207	return crypto_shash_setkey(*ctx, key, keylen);
	208	}
	209
	210	static int shash_async_init(struct ahash_request *req)
	211	{
	212	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	213	struct shash_desc *desc = ahash_request_ctx(req);
	214
	215	desc->tfm = *ctx;
	216	desc->flags = req->base.flags;
	217
	218	return crypto_shash_init(desc);
	219	}
	220
7eddf95e	221	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	222	{
3b2f6df0 HX	223	struct crypto_hash_walk walk;
	224	int nbytes;
	225
	226	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	227	nbytes = crypto_hash_walk_done(&walk, nbytes))
	228	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	229
	230	return nbytes;
	231	}
7eddf95e HX	232	EXPORT_SYMBOL_GPL(shash_ahash_update);
	233
	234	static int shash_async_update(struct ahash_request *req)
	235	{
	236	return shash_ahash_update(req, ahash_request_ctx(req));
	237	}
3b2f6df0 HX	238
	239	static int shash_async_final(struct ahash_request *req)
	240	{
	241	return crypto_shash_final(ahash_request_ctx(req), req->result);
	242	}
	243
66f6ce5e HX	244	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	245	{
	246	struct crypto_hash_walk walk;
	247	int nbytes;
	248
cbc86b91 HX	249	nbytes = crypto_hash_walk_first(req, &walk);
	250	if (!nbytes)
	251	return crypto_shash_final(desc, req->result);
	252
	253	do {
66f6ce5e HX	254	nbytes = crypto_hash_walk_last(&walk) ?
	255	crypto_shash_finup(desc, walk.data, nbytes,
	256	req->result) :
	257	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	258	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	259	} while (nbytes > 0);
66f6ce5e HX	260
	261	return nbytes;
	262	}
	263	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	264
	265	static int shash_async_finup(struct ahash_request *req)
	266	{
	267	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	268	struct shash_desc *desc = ahash_request_ctx(req);
	269
	270	desc->tfm = *ctx;
	271	desc->flags = req->base.flags;
	272
	273	return shash_ahash_finup(req, desc);
	274	}
	275
7eddf95e	276	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0 HX	277	{
	278	struct scatterlist *sg = req->src;
	279	unsigned int offset = sg->offset;
	280	unsigned int nbytes = req->nbytes;
	281	int err;
	282
	283	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
3b2f6df0 HX	284	void *data;
3b2f6df0 HX	285
f0dfc0b0	286	data = kmap_atomic(sg_page(sg));
3b2f6df0 HX	287	err = crypto_shash_digest(desc, data + offset, nbytes,
3b2f6df0 HX	288	req->result);
f0dfc0b0	289	kunmap_atomic(data);
3b2f6df0	290	crypto_yield(desc->flags);
7eddf95e HX	291	} else
7eddf95e HX	292	err = crypto_shash_init(desc) ?:
66f6ce5e	293	shash_ahash_finup(req, desc);
3b2f6df0	294
7eddf95e HX	295	return err;
	296	}
	297	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	298
7eddf95e HX	299	static int shash_async_digest(struct ahash_request *req)
	300	{
	301	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	302	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	303
7eddf95e HX	304	desc->tfm = *ctx;
7eddf95e HX	305	desc->flags = req->base.flags;
3b2f6df0	306
7eddf95e	307	return shash_ahash_digest(req, desc);
3b2f6df0 HX	308	}
3b2f6df0 HX	309
66f6ce5e HX	310	static int shash_async_export(struct ahash_request req, void out)
	311	{
	312	return crypto_shash_export(ahash_request_ctx(req), out);
	313	}
	314
	315	static int shash_async_import(struct ahash_request req, const void in)
	316	{
90246e79 HX	317	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	318	struct shash_desc *desc = ahash_request_ctx(req);
	319
	320	desc->tfm = *ctx;
	321	desc->flags = req->base.flags;
	322
	323	return crypto_shash_import(desc, in);
66f6ce5e HX	324	}
66f6ce5e HX	325
3b2f6df0 HX	326	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	327	{
	328	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	329
	330	crypto_free_shash(*ctx);
	331	}
	332
88056ec3	333	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	334	{
3b2f6df0 HX	335	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	336	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	337	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	338	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	339	struct crypto_shash *shash;
	340
	341	if (!crypto_mod_get(calg))
	342	return -EAGAIN;
	343
3f683d61	344	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	345	if (IS_ERR(shash)) {
	346	crypto_mod_put(calg);
	347	return PTR_ERR(shash);
	348	}
	349
	350	*ctx = shash;
	351	tfm->exit = crypto_exit_shash_ops_async;
	352
	353	crt->init = shash_async_init;
	354	crt->update = shash_async_update;
66f6ce5e HX	355	crt->final = shash_async_final;
66f6ce5e HX	356	crt->finup = shash_async_finup;
3b2f6df0	357	crt->digest = shash_async_digest;
00420a65 HX	358	crt->setkey = shash_async_setkey;
	359
	360	crt->has_setkey = alg->setkey != shash_no_setkey;
66f6ce5e	361
66f6ce5e HX	362	if (alg->export)
66f6ce5e HX	363	crt->export = shash_async_export;
0044f3ed	364	if (alg->import)
66f6ce5e	365	crt->import = shash_async_import;
3b2f6df0	366
3b2f6df0 HX	367	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	368
	369	return 0;
	370	}
	371
2ca33da1	372	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	373	{
113adefc HX	374	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	375
	376	hash->descsize = crypto_shash_alg(hash)->descsize;
7b5a080b HX	377	return 0;
	378	}
	379
3acc8473	380	#ifdef CONFIG_NET
f4d663ce SK	381	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	382	{
	383	struct crypto_report_hash rhash;
	384	struct shash_alg *salg = __crypto_shash_alg(alg);
	385
9a5467bf MK	386	strncpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf MK	387
f4d663ce SK	388	rhash.blocksize = alg->cra_blocksize;
	389	rhash.digestsize = salg->digestsize;
	390
6662df33 DM	391	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
	392	sizeof(struct crypto_report_hash), &rhash))
	393	goto nla_put_failure;
f4d663ce SK	394	return 0;
	395
	396	nla_put_failure:
	397	return -EMSGSIZE;
	398	}
3acc8473 HX	399	#else
	400	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	401	{
	402	return -ENOSYS;
	403	}
	404	#endif
f4d663ce	405
7b5a080b	406	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	407	__maybe_unused;
7b5a080b HX	408	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	409	{
	410	struct shash_alg *salg = __crypto_shash_alg(alg);
	411
	412	seq_printf(m, "type : shash\n");
	413	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	414	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	415	}
	416
	417	static const struct crypto_type crypto_shash_type = {
ac611680	418	.extsize = crypto_alg_extsize,
7b5a080b HX	419	.init_tfm = crypto_shash_init_tfm,
	420	#ifdef CONFIG_PROC_FS
	421	.show = crypto_shash_show,
	422	#endif
f4d663ce	423	.report = crypto_shash_report,
7b5a080b HX	424	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	425	.maskset = CRYPTO_ALG_TYPE_MASK,
	426	.type = CRYPTO_ALG_TYPE_SHASH,
	427	.tfmsize = offsetof(struct crypto_shash, base),
	428	};
	429
	430	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	431	u32 mask)
	432	{
3f683d61	433	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	434	}
	435	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	436
619a6ebd	437	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	438	{
	439	struct crypto_alg *base = &alg->base;
	440
	441	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	442	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	443	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	444	return -EINVAL;
	445
	446	base->cra_type = &crypto_shash_type;
	447	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	448	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	449
8267adab HX	450	if (!alg->finup)
	451	alg->finup = shash_finup_unaligned;
	452	if (!alg->digest)
	453	alg->digest = shash_digest_unaligned;
f592682f HX	454	if (!alg->export) {
	455	alg->export = shash_default_export;
	456	alg->import = shash_default_import;
	457	alg->statesize = alg->descsize;
	458	}
57cfe44b HX	459	if (!alg->setkey)
57cfe44b HX	460	alg->setkey = shash_no_setkey;
99d27e1c	461
619a6ebd HX	462	return 0;
	463	}
	464
	465	int crypto_register_shash(struct shash_alg *alg)
	466	{
	467	struct crypto_alg *base = &alg->base;
	468	int err;
	469
	470	err = shash_prepare_alg(alg);
	471	if (err)
	472	return err;
7b5a080b HX	473
	474	return crypto_register_alg(base);
	475	}
	476	EXPORT_SYMBOL_GPL(crypto_register_shash);
	477
	478	int crypto_unregister_shash(struct shash_alg *alg)
	479	{
	480	return crypto_unregister_alg(&alg->base);
	481	}
	482	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	483
50fc3e8d JK	484	int crypto_register_shashes(struct shash_alg *algs, int count)
	485	{
	486	int i, ret;
	487
	488	for (i = 0; i < count; i++) {
	489	ret = crypto_register_shash(&algs[i]);
	490	if (ret)
	491	goto err;
	492	}
	493
	494	return 0;
	495
	496	err:
	497	for (--i; i >= 0; --i)
	498	crypto_unregister_shash(&algs[i]);
	499
	500	return ret;
	501	}
	502	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	503
	504	int crypto_unregister_shashes(struct shash_alg *algs, int count)
	505	{
	506	int i, ret;
	507
	508	for (i = count - 1; i >= 0; --i) {
	509	ret = crypto_unregister_shash(&algs[i]);
	510	if (ret)
	511	pr_err("Failed to unregister %s %s: %d\n",
	512	algs[i].base.cra_driver_name,
	513	algs[i].base.cra_name, ret);
	514	}
	515
	516	return 0;
	517	}
	518	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	519
619a6ebd HX	520	int shash_register_instance(struct crypto_template *tmpl,
	521	struct shash_instance *inst)
	522	{
	523	int err;
	524
	525	err = shash_prepare_alg(&inst->alg);
	526	if (err)
	527	return err;
	528
	529	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	530	}
	531	EXPORT_SYMBOL_GPL(shash_register_instance);
	532
2e4fddd8 HX	533	void shash_free_instance(struct crypto_instance *inst)
	534	{
	535	crypto_drop_spawn(crypto_instance_ctx(inst));
	536	kfree(shash_instance(inst));
	537	}
	538	EXPORT_SYMBOL_GPL(shash_free_instance);
	539
94296999 HX	540	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	541	struct shash_alg *alg,
	542	struct crypto_instance *inst)
	543	{
	544	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	545	&crypto_shash_type);
	546	}
	547	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	548
7d6f5640 HX	549	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	550	{
	551	struct crypto_alg *alg;
	552
	553	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	554	return IS_ERR(alg) ? ERR_CAST(alg) :
	555	container_of(alg, struct shash_alg, base);
	556	}
	557	EXPORT_SYMBOL_GPL(shash_attr_alg);
	558
7b5a080b HX	559	MODULE_LICENSE("GPL");
7b5a080b HX	560	MODULE_DESCRIPTION("Synchronous cryptographic hash type");