[thirdparty/kernel/stable.git] / crypto / shash.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Synchronous Cryptographic Hash operations.
 *
 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 */

#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;

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

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_ATOMIC);
	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;
}

static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
{
	if (crypto_shash_alg_has_setkey(alg) &&
	    !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
		crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
}

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);
	int err;

	if ((unsigned long)key & alignmask)
		err = shash_setkey_unaligned(tfm, key, keylen);
	else
		err = shash->setkey(tfm, key, keylen);

	if (unlikely(err)) {
		shash_set_needkey(tfm, shash);
		return err;
	}

	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_setkey);

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);
	/*
	 * We cannot count on __aligned() working for large values:
	 * https://patchwork.kernel.org/patch/9507697/
	 */
	u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
		return -EINVAL;

	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);
	/*
	 * We cannot count on __aligned() working for large values:
	 * https://patchwork.kernel.org/patch/9507697/
	 */
	u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
		return -EINVAL;

	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 (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
		return -ENOKEY;

	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;

	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;

	return shash_ahash_finup(req, desc);
}

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

	if (nbytes &&
	    (sg = req->src, offset = sg->offset,
	     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);
	} 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;

	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;

	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;
	if (crypto_shash_alg_has_setkey(alg))
		crt->setkey = shash_async_setkey;

	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
				    CRYPTO_TFM_NEED_KEY);

	crt->export = shash_async_export;
	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);
	struct shash_alg *alg = crypto_shash_alg(hash);

	hash->descsize = alg->descsize;

	shash_set_needkey(hash, alg);

	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);

	memset(&rhash, 0, sizeof(rhash));

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

	rhash.blocksize = alg->cra_blocksize;
	rhash.digestsize = salg->digestsize;

	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
}
#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 > HASH_MAX_DIGESTSIZE ||
	    alg->descsize > HASH_MAX_DESCSIZE ||
	    alg->statesize > HASH_MAX_STATESIZE)
		return -EINVAL;

	if ((alg->export && !alg->import) || (alg->import && !alg->export))
		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
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Synchronous Cryptographic Hash operations.
	4	*
	5	* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
	6	*/
	7
	8	#include <crypto/scatterwalk.h>
	9	#include <crypto/internal/hash.h>
	10	#include <linux/err.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/seq_file.h>
	15	#include <linux/cryptouser.h>
	16	#include <net/netlink.h>
	17	#include <linux/compiler.h>
	18
	19	#include "internal.h"
	20
	21	static const struct crypto_type crypto_shash_type;
	22
	23	int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	24	unsigned int keylen)
	25	{
	26	return -ENOSYS;
	27	}
	28	EXPORT_SYMBOL_GPL(shash_no_setkey);
	29
	30	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	31	unsigned int keylen)
	32	{
	33	struct shash_alg *shash = crypto_shash_alg(tfm);
	34	unsigned long alignmask = crypto_shash_alignmask(tfm);
	35	unsigned long absize;
	36	u8 buffer, alignbuffer;
	37	int err;
	38
	39	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
	40	buffer = kmalloc(absize, GFP_ATOMIC);
	41	if (!buffer)
	42	return -ENOMEM;
	43
	44	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	45	memcpy(alignbuffer, key, keylen);
	46	err = shash->setkey(tfm, alignbuffer, keylen);
	47	kzfree(buffer);
	48	return err;
	49	}
	50
	51	static void shash_set_needkey(struct crypto_shash tfm, struct shash_alg alg)
	52	{
	53	if (crypto_shash_alg_has_setkey(alg) &&
	54	!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
	55	crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
	56	}
	57
	58	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	59	unsigned int keylen)
	60	{
	61	struct shash_alg *shash = crypto_shash_alg(tfm);
	62	unsigned long alignmask = crypto_shash_alignmask(tfm);
	63	int err;
	64
	65	if ((unsigned long)key & alignmask)
	66	err = shash_setkey_unaligned(tfm, key, keylen);
	67	else
	68	err = shash->setkey(tfm, key, keylen);
	69
	70	if (unlikely(err)) {
	71	shash_set_needkey(tfm, shash);
	72	return err;
	73	}
	74
	75	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
	76	return 0;
	77	}
	78	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	79
	80	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	81	unsigned int len)
	82	{
	83	struct crypto_shash *tfm = desc->tfm;
	84	struct shash_alg *shash = crypto_shash_alg(tfm);
	85	unsigned long alignmask = crypto_shash_alignmask(tfm);
	86	unsigned int unaligned_len = alignmask + 1 -
	87	((unsigned long)data & alignmask);
	88	/*
	89	* We cannot count on __aligned() working for large values:
	90	* https://patchwork.kernel.org/patch/9507697/
	91	*/
	92	u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
	93	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	94	int err;
	95
	96	if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
	97	return -EINVAL;
	98
	99	if (unaligned_len > len)
	100	unaligned_len = len;
	101
	102	memcpy(buf, data, unaligned_len);
	103	err = shash->update(desc, buf, unaligned_len);
	104	memset(buf, 0, unaligned_len);
	105
	106	return err ?:
	107	shash->update(desc, data + unaligned_len, len - unaligned_len);
	108	}
	109
	110	int crypto_shash_update(struct shash_desc desc, const u8 data,
	111	unsigned int len)
	112	{
	113	struct crypto_shash *tfm = desc->tfm;
	114	struct shash_alg *shash = crypto_shash_alg(tfm);
	115	unsigned long alignmask = crypto_shash_alignmask(tfm);
	116
	117	if ((unsigned long)data & alignmask)
	118	return shash_update_unaligned(desc, data, len);
	119
	120	return shash->update(desc, data, len);
	121	}
	122	EXPORT_SYMBOL_GPL(crypto_shash_update);
	123
	124	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	125	{
	126	struct crypto_shash *tfm = desc->tfm;
	127	unsigned long alignmask = crypto_shash_alignmask(tfm);
	128	struct shash_alg *shash = crypto_shash_alg(tfm);
	129	unsigned int ds = crypto_shash_digestsize(tfm);
	130	/*
	131	* We cannot count on __aligned() working for large values:
	132	* https://patchwork.kernel.org/patch/9507697/
	133	*/
	134	u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
	135	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	136	int err;
	137
	138	if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
	139	return -EINVAL;
	140
	141	err = shash->final(desc, buf);
	142	if (err)
	143	goto out;
	144
	145	memcpy(out, buf, ds);
	146
	147	out:
	148	memset(buf, 0, ds);
	149	return err;
	150	}
	151
	152	int crypto_shash_final(struct shash_desc desc, u8 out)
	153	{
	154	struct crypto_shash *tfm = desc->tfm;
	155	struct shash_alg *shash = crypto_shash_alg(tfm);
	156	unsigned long alignmask = crypto_shash_alignmask(tfm);
	157
	158	if ((unsigned long)out & alignmask)
	159	return shash_final_unaligned(desc, out);
	160
	161	return shash->final(desc, out);
	162	}
	163	EXPORT_SYMBOL_GPL(crypto_shash_final);
	164
	165	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	166	unsigned int len, u8 *out)
	167	{
	168	return crypto_shash_update(desc, data, len) ?:
	169	crypto_shash_final(desc, out);
	170	}
	171
	172	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	173	unsigned int len, u8 *out)
	174	{
	175	struct crypto_shash *tfm = desc->tfm;
	176	struct shash_alg *shash = crypto_shash_alg(tfm);
	177	unsigned long alignmask = crypto_shash_alignmask(tfm);
	178
	179	if (((unsigned long)data \| (unsigned long)out) & alignmask)
	180	return shash_finup_unaligned(desc, data, len, out);
	181
	182	return shash->finup(desc, data, len, out);
	183	}
	184	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	185
	186	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	187	unsigned int len, u8 *out)
	188	{
	189	return crypto_shash_init(desc) ?:
	190	crypto_shash_finup(desc, data, len, out);
	191	}
	192
	193	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	194	unsigned int len, u8 *out)
	195	{
	196	struct crypto_shash *tfm = desc->tfm;
	197	struct shash_alg *shash = crypto_shash_alg(tfm);
	198	unsigned long alignmask = crypto_shash_alignmask(tfm);
	199
	200	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	201	return -ENOKEY;
	202
	203	if (((unsigned long)data \| (unsigned long)out) & alignmask)
	204	return shash_digest_unaligned(desc, data, len, out);
	205
	206	return shash->digest(desc, data, len, out);
	207	}
	208	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	209
	210	static int shash_default_export(struct shash_desc desc, void out)
	211	{
	212	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
	213	return 0;
	214	}
	215
	216	static int shash_default_import(struct shash_desc desc, const void in)
	217	{
	218	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
	219	return 0;
	220	}
	221
	222	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	223	unsigned int keylen)
	224	{
	225	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	226
	227	return crypto_shash_setkey(*ctx, key, keylen);
	228	}
	229
	230	static int shash_async_init(struct ahash_request *req)
	231	{
	232	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	233	struct shash_desc *desc = ahash_request_ctx(req);
	234
	235	desc->tfm = *ctx;
	236
	237	return crypto_shash_init(desc);
	238	}
	239
	240	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
	241	{
	242	struct crypto_hash_walk walk;
	243	int nbytes;
	244
	245	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	246	nbytes = crypto_hash_walk_done(&walk, nbytes))
	247	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	248
	249	return nbytes;
	250	}
	251	EXPORT_SYMBOL_GPL(shash_ahash_update);
	252
	253	static int shash_async_update(struct ahash_request *req)
	254	{
	255	return shash_ahash_update(req, ahash_request_ctx(req));
	256	}
	257
	258	static int shash_async_final(struct ahash_request *req)
	259	{
	260	return crypto_shash_final(ahash_request_ctx(req), req->result);
	261	}
	262
	263	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	264	{
	265	struct crypto_hash_walk walk;
	266	int nbytes;
	267
	268	nbytes = crypto_hash_walk_first(req, &walk);
	269	if (!nbytes)
	270	return crypto_shash_final(desc, req->result);
	271
	272	do {
	273	nbytes = crypto_hash_walk_last(&walk) ?
	274	crypto_shash_finup(desc, walk.data, nbytes,
	275	req->result) :
	276	crypto_shash_update(desc, walk.data, nbytes);
	277	nbytes = crypto_hash_walk_done(&walk, nbytes);
	278	} while (nbytes > 0);
	279
	280	return nbytes;
	281	}
	282	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	283
	284	static int shash_async_finup(struct ahash_request *req)
	285	{
	286	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	287	struct shash_desc *desc = ahash_request_ctx(req);
	288
	289	desc->tfm = *ctx;
	290
	291	return shash_ahash_finup(req, desc);
	292	}
	293
	294	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
	295	{
	296	unsigned int nbytes = req->nbytes;
	297	struct scatterlist *sg;
	298	unsigned int offset;
	299	int err;
	300
	301	if (nbytes &&
	302	(sg = req->src, offset = sg->offset,
	303	nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
	304	void *data;
	305
	306	data = kmap_atomic(sg_page(sg));
	307	err = crypto_shash_digest(desc, data + offset, nbytes,
	308	req->result);
	309	kunmap_atomic(data);
	310	} else
	311	err = crypto_shash_init(desc) ?:
	312	shash_ahash_finup(req, desc);
	313
	314	return err;
	315	}
	316	EXPORT_SYMBOL_GPL(shash_ahash_digest);
	317
	318	static int shash_async_digest(struct ahash_request *req)
	319	{
	320	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	321	struct shash_desc *desc = ahash_request_ctx(req);
	322
	323	desc->tfm = *ctx;
	324
	325	return shash_ahash_digest(req, desc);
	326	}
	327
	328	static int shash_async_export(struct ahash_request req, void out)
	329	{
	330	return crypto_shash_export(ahash_request_ctx(req), out);
	331	}
	332
	333	static int shash_async_import(struct ahash_request req, const void in)
	334	{
	335	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	336	struct shash_desc *desc = ahash_request_ctx(req);
	337
	338	desc->tfm = *ctx;
	339
	340	return crypto_shash_import(desc, in);
	341	}
	342
	343	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	344	{
	345	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	346
	347	crypto_free_shash(*ctx);
	348	}
	349
	350	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
	351	{
	352	struct crypto_alg *calg = tfm->__crt_alg;
	353	struct shash_alg *alg = __crypto_shash_alg(calg);
	354	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
	355	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	356	struct crypto_shash *shash;
	357
	358	if (!crypto_mod_get(calg))
	359	return -EAGAIN;
	360
	361	shash = crypto_create_tfm(calg, &crypto_shash_type);
	362	if (IS_ERR(shash)) {
	363	crypto_mod_put(calg);
	364	return PTR_ERR(shash);
	365	}
	366
	367	*ctx = shash;
	368	tfm->exit = crypto_exit_shash_ops_async;
	369
	370	crt->init = shash_async_init;
	371	crt->update = shash_async_update;
	372	crt->final = shash_async_final;
	373	crt->finup = shash_async_finup;
	374	crt->digest = shash_async_digest;
	375	if (crypto_shash_alg_has_setkey(alg))
	376	crt->setkey = shash_async_setkey;
	377
	378	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
	379	CRYPTO_TFM_NEED_KEY);
	380
	381	crt->export = shash_async_export;
	382	crt->import = shash_async_import;
	383
	384	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	385
	386	return 0;
	387	}
	388
	389	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
	390	{
	391	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	392	struct shash_alg *alg = crypto_shash_alg(hash);
	393
	394	hash->descsize = alg->descsize;
	395
	396	shash_set_needkey(hash, alg);
	397
	398	return 0;
	399	}
	400
	401	#ifdef CONFIG_NET
	402	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	403	{
	404	struct crypto_report_hash rhash;
	405	struct shash_alg *salg = __crypto_shash_alg(alg);
	406
	407	memset(&rhash, 0, sizeof(rhash));
	408
	409	strscpy(rhash.type, "shash", sizeof(rhash.type));
	410
	411	rhash.blocksize = alg->cra_blocksize;
	412	rhash.digestsize = salg->digestsize;
	413
	414	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
	415	}
	416	#else
	417	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	418	{
	419	return -ENOSYS;
	420	}
	421	#endif
	422
	423	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	424	__maybe_unused;
	425	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	426	{
	427	struct shash_alg *salg = __crypto_shash_alg(alg);
	428
	429	seq_printf(m, "type : shash\n");
	430	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	431	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	432	}
	433
	434	static const struct crypto_type crypto_shash_type = {
	435	.extsize = crypto_alg_extsize,
	436	.init_tfm = crypto_shash_init_tfm,
	437	#ifdef CONFIG_PROC_FS
	438	.show = crypto_shash_show,
	439	#endif
	440	.report = crypto_shash_report,
	441	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	442	.maskset = CRYPTO_ALG_TYPE_MASK,
	443	.type = CRYPTO_ALG_TYPE_SHASH,
	444	.tfmsize = offsetof(struct crypto_shash, base),
	445	};
	446
	447	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	448	u32 mask)
	449	{
	450	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
	451	}
	452	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	453
	454	static int shash_prepare_alg(struct shash_alg *alg)
	455	{
	456	struct crypto_alg *base = &alg->base;
	457
	458	if (alg->digestsize > HASH_MAX_DIGESTSIZE \|\|
	459	alg->descsize > HASH_MAX_DESCSIZE \|\|
	460	alg->statesize > HASH_MAX_STATESIZE)
	461	return -EINVAL;
	462
	463	if ((alg->export && !alg->import) \|\| (alg->import && !alg->export))
	464	return -EINVAL;
	465
	466	base->cra_type = &crypto_shash_type;
	467	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	468	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
	469
	470	if (!alg->finup)
	471	alg->finup = shash_finup_unaligned;
	472	if (!alg->digest)
	473	alg->digest = shash_digest_unaligned;
	474	if (!alg->export) {
	475	alg->export = shash_default_export;
	476	alg->import = shash_default_import;
	477	alg->statesize = alg->descsize;
	478	}
	479	if (!alg->setkey)
	480	alg->setkey = shash_no_setkey;
	481
	482	return 0;
	483	}
	484
	485	int crypto_register_shash(struct shash_alg *alg)
	486	{
	487	struct crypto_alg *base = &alg->base;
	488	int err;
	489
	490	err = shash_prepare_alg(alg);
	491	if (err)
	492	return err;
	493
	494	return crypto_register_alg(base);
	495	}
	496	EXPORT_SYMBOL_GPL(crypto_register_shash);
	497
	498	int crypto_unregister_shash(struct shash_alg *alg)
	499	{
	500	return crypto_unregister_alg(&alg->base);
	501	}
	502	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	503
	504	int crypto_register_shashes(struct shash_alg *algs, int count)
	505	{
	506	int i, ret;
	507
	508	for (i = 0; i < count; i++) {
	509	ret = crypto_register_shash(&algs[i]);
	510	if (ret)
	511	goto err;
	512	}
	513
	514	return 0;
	515
	516	err:
	517	for (--i; i >= 0; --i)
	518	crypto_unregister_shash(&algs[i]);
	519
	520	return ret;
	521	}
	522	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	523
	524	int crypto_unregister_shashes(struct shash_alg *algs, int count)
	525	{
	526	int i, ret;
	527
	528	for (i = count - 1; i >= 0; --i) {
	529	ret = crypto_unregister_shash(&algs[i]);
	530	if (ret)
	531	pr_err("Failed to unregister %s %s: %d\n",
	532	algs[i].base.cra_driver_name,
	533	algs[i].base.cra_name, ret);
	534	}
	535
	536	return 0;
	537	}
	538	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	539
	540	int shash_register_instance(struct crypto_template *tmpl,
	541	struct shash_instance *inst)
	542	{
	543	int err;
	544
	545	err = shash_prepare_alg(&inst->alg);
	546	if (err)
	547	return err;
	548
	549	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	550	}
	551	EXPORT_SYMBOL_GPL(shash_register_instance);
	552
	553	void shash_free_instance(struct crypto_instance *inst)
	554	{
	555	crypto_drop_spawn(crypto_instance_ctx(inst));
	556	kfree(shash_instance(inst));
	557	}
	558	EXPORT_SYMBOL_GPL(shash_free_instance);
	559
	560	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	561	struct shash_alg *alg,
	562	struct crypto_instance *inst)
	563	{
	564	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	565	&crypto_shash_type);
	566	}
	567	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	568
	569	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	570	{
	571	struct crypto_alg *alg;
	572
	573	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	574	return IS_ERR(alg) ? ERR_CAST(alg) :
	575	container_of(alg, struct shash_alg, base);
	576	}
	577	EXPORT_SYMBOL_GPL(shash_attr_alg);
	578
	579	MODULE_LICENSE("GPL");
	580	MODULE_DESCRIPTION("Synchronous cryptographic hash type");