[linux-block.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 <linux/cryptouser.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <net/netlink.h>

#include "hash.h"

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

static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
{
	if (crypto_shash_alg_needs_key(alg))
		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);
	int err;

	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);

int crypto_shash_update(struct shash_desc *desc, const u8 *data,
			unsigned int len)
{
	return crypto_shash_alg(desc->tfm)->update(desc, data, len);
}
EXPORT_SYMBOL_GPL(crypto_shash_update);

int crypto_shash_final(struct shash_desc *desc, u8 *out)
{
	return crypto_shash_alg(desc->tfm)->final(desc, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_final);

static int shash_default_finup(struct shash_desc *desc, const u8 *data,
			       unsigned int len, u8 *out)
{
	struct shash_alg *shash = crypto_shash_alg(desc->tfm);

	return shash->update(desc, data, len) ?:
	       shash->final(desc, out);
}

int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
		       unsigned int len, u8 *out)
{
	return crypto_shash_alg(desc->tfm)->finup(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_finup);

static int shash_default_digest(struct shash_desc *desc, const u8 *data,
				unsigned int len, u8 *out)
{
	struct shash_alg *shash = crypto_shash_alg(desc->tfm);

	return shash->init(desc) ?:
	       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;

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

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

int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
			    unsigned int len, u8 *out)
{
	SHASH_DESC_ON_STACK(desc, tfm);
	int err;

	desc->tfm = tfm;

	err = crypto_shash_digest(desc, data, len, out);

	shash_desc_zero(desc);

	return err;
}
EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);

int crypto_shash_export(struct shash_desc *desc, void *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);

	if (shash->export)
		return shash->export(desc, out);

	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_export);

int crypto_shash_import(struct shash_desc *desc, const void *in)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);

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

	if (shash->import)
		return shash->import(desc, in);

	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_import);

static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	struct shash_alg *alg = crypto_shash_alg(hash);

	alg->exit_tfm(hash);
}

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);
	int err;

	hash->descsize = alg->descsize;

	shash_set_needkey(hash, alg);

	if (alg->exit_tfm)
		tfm->exit = crypto_shash_exit_tfm;

	if (!alg->init_tfm)
		return 0;

	err = alg->init_tfm(hash);
	if (err)
		return err;

	/* ->init_tfm() may have increased the descsize. */
	if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
		if (alg->exit_tfm)
			alg->exit_tfm(hash);
		return -EINVAL;
	}

	return 0;
}

static void crypto_shash_free_instance(struct crypto_instance *inst)
{
	struct shash_instance *shash = shash_instance(inst);

	shash->free(shash);
}

static int __maybe_unused 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);
}

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);
}

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

int crypto_grab_shash(struct crypto_shash_spawn *spawn,
		      struct crypto_instance *inst,
		      const char *name, u32 type, u32 mask)
{
	spawn->base.frontend = &crypto_shash_type;
	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_shash);

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);

int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
{
	return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_has_shash);

struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
{
	struct crypto_tfm *tfm = crypto_shash_tfm(hash);
	struct shash_alg *alg = crypto_shash_alg(hash);
	struct crypto_shash *nhash;
	int err;

	if (!crypto_shash_alg_has_setkey(alg)) {
		tfm = crypto_tfm_get(tfm);
		if (IS_ERR(tfm))
			return ERR_CAST(tfm);

		return hash;
	}

	if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
		return ERR_PTR(-ENOSYS);

	nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
	if (IS_ERR(nhash))
		return nhash;

	nhash->descsize = hash->descsize;

	if (alg->clone_tfm) {
		err = alg->clone_tfm(nhash, hash);
		if (err) {
			crypto_free_shash(nhash);
			return ERR_PTR(err);
		}
	}

	return nhash;
}
EXPORT_SYMBOL_GPL(crypto_clone_shash);

int hash_prepare_alg(struct hash_alg_common *alg)
{
	struct crypto_alg *base = &alg->base;

	if (alg->digestsize > HASH_MAX_DIGESTSIZE)
		return -EINVAL;

	/* alignmask is not useful for hashes, so it is not supported. */
	if (base->cra_alignmask)
		return -EINVAL;

	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;

	return 0;
}

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

	if (alg->descsize > HASH_MAX_DESCSIZE)
		return -EINVAL;

	if ((alg->export && !alg->import) || (alg->import && !alg->export))
		return -EINVAL;

	err = hash_prepare_alg(&alg->halg);
	if (err)
		return err;

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

	/*
	 * Handle missing optional functions.  For each one we can either
	 * install a default here, or we can leave the pointer as NULL and check
	 * the pointer for NULL in crypto_shash_*(), avoiding an indirect call
	 * when the default behavior is desired.  For ->finup and ->digest we
	 * install defaults, since for optimal performance algorithms should
	 * implement these anyway.  On the other hand, for ->import and
	 * ->export the common case and best performance comes from the simple
	 * memcpy of the shash_desc_ctx, so when those pointers are NULL we
	 * leave them NULL and provide the memcpy with no indirect call.
	 */
	if (!alg->finup)
		alg->finup = shash_default_finup;
	if (!alg->digest)
		alg->digest = shash_default_digest;
	if (!alg->export)
		alg->halg.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);

void crypto_unregister_shash(struct shash_alg *alg)
{
	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);

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

	for (i = count - 1; i >= 0; --i)
		crypto_unregister_shash(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_shashes);

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

	if (WARN_ON(!inst->free))
		return -EINVAL;

	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_singlespawn_instance(struct shash_instance *inst)
{
	crypto_drop_spawn(shash_instance_ctx(inst));
	kfree(inst);
}
EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);

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 <linux/cryptouser.h>
	10	#include <linux/err.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/seq_file.h>
	14	#include <linux/string.h>
	15	#include <net/netlink.h>
	16
	17	#include "hash.h"
	18
	19	int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	20	unsigned int keylen)
	21	{
	22	return -ENOSYS;
	23	}
	24	EXPORT_SYMBOL_GPL(shash_no_setkey);
	25
	26	static void shash_set_needkey(struct crypto_shash tfm, struct shash_alg alg)
	27	{
	28	if (crypto_shash_alg_needs_key(alg))
	29	crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
	30	}
	31
	32	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	33	unsigned int keylen)
	34	{
	35	struct shash_alg *shash = crypto_shash_alg(tfm);
	36	int err;
	37
	38	err = shash->setkey(tfm, key, keylen);
	39	if (unlikely(err)) {
	40	shash_set_needkey(tfm, shash);
	41	return err;
	42	}
	43
	44	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
	45	return 0;
	46	}
	47	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	48
	49	int crypto_shash_update(struct shash_desc desc, const u8 data,
	50	unsigned int len)
	51	{
	52	return crypto_shash_alg(desc->tfm)->update(desc, data, len);
	53	}
	54	EXPORT_SYMBOL_GPL(crypto_shash_update);
	55
	56	int crypto_shash_final(struct shash_desc desc, u8 out)
	57	{
	58	return crypto_shash_alg(desc->tfm)->final(desc, out);
	59	}
	60	EXPORT_SYMBOL_GPL(crypto_shash_final);
	61
	62	static int shash_default_finup(struct shash_desc desc, const u8 data,
	63	unsigned int len, u8 *out)
	64	{
	65	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
	66
	67	return shash->update(desc, data, len) ?:
	68	shash->final(desc, out);
	69	}
	70
	71	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	72	unsigned int len, u8 *out)
	73	{
	74	return crypto_shash_alg(desc->tfm)->finup(desc, data, len, out);
	75	}
	76	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	77
	78	static int shash_default_digest(struct shash_desc desc, const u8 data,
	79	unsigned int len, u8 *out)
	80	{
	81	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
	82
	83	return shash->init(desc) ?:
	84	shash->finup(desc, data, len, out);
	85	}
	86
	87	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	88	unsigned int len, u8 *out)
	89	{
	90	struct crypto_shash *tfm = desc->tfm;
	91
	92	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	93	return -ENOKEY;
	94
	95	return crypto_shash_alg(tfm)->digest(desc, data, len, out);
	96	}
	97	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	98
	99	int crypto_shash_tfm_digest(struct crypto_shash tfm, const u8 data,
	100	unsigned int len, u8 *out)
	101	{
	102	SHASH_DESC_ON_STACK(desc, tfm);
	103	int err;
	104
	105	desc->tfm = tfm;
	106
	107	err = crypto_shash_digest(desc, data, len, out);
	108
	109	shash_desc_zero(desc);
	110
	111	return err;
	112	}
	113	EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
	114
	115	int crypto_shash_export(struct shash_desc desc, void out)
	116	{
	117	struct crypto_shash *tfm = desc->tfm;
	118	struct shash_alg *shash = crypto_shash_alg(tfm);
	119
	120	if (shash->export)
	121	return shash->export(desc, out);
	122
	123	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
	124	return 0;
	125	}
	126	EXPORT_SYMBOL_GPL(crypto_shash_export);
	127
	128	int crypto_shash_import(struct shash_desc desc, const void in)
	129	{
	130	struct crypto_shash *tfm = desc->tfm;
	131	struct shash_alg *shash = crypto_shash_alg(tfm);
	132
	133	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	134	return -ENOKEY;
	135
	136	if (shash->import)
	137	return shash->import(desc, in);
	138
	139	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
	140	return 0;
	141	}
	142	EXPORT_SYMBOL_GPL(crypto_shash_import);
	143
	144	static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
	145	{
	146	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	147	struct shash_alg *alg = crypto_shash_alg(hash);
	148
	149	alg->exit_tfm(hash);
	150	}
	151
	152	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
	153	{
	154	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	155	struct shash_alg *alg = crypto_shash_alg(hash);
	156	int err;
	157
	158	hash->descsize = alg->descsize;
	159
	160	shash_set_needkey(hash, alg);
	161
	162	if (alg->exit_tfm)
	163	tfm->exit = crypto_shash_exit_tfm;
	164
	165	if (!alg->init_tfm)
	166	return 0;
	167
	168	err = alg->init_tfm(hash);
	169	if (err)
	170	return err;
	171
	172	/* ->init_tfm() may have increased the descsize. */
	173	if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
	174	if (alg->exit_tfm)
	175	alg->exit_tfm(hash);
	176	return -EINVAL;
	177	}
	178
	179	return 0;
	180	}
	181
	182	static void crypto_shash_free_instance(struct crypto_instance *inst)
	183	{
	184	struct shash_instance *shash = shash_instance(inst);
	185
	186	shash->free(shash);
	187	}
	188
	189	static int __maybe_unused crypto_shash_report(
	190	struct sk_buff skb, struct crypto_alg alg)
	191	{
	192	struct crypto_report_hash rhash;
	193	struct shash_alg *salg = __crypto_shash_alg(alg);
	194
	195	memset(&rhash, 0, sizeof(rhash));
	196
	197	strscpy(rhash.type, "shash", sizeof(rhash.type));
	198
	199	rhash.blocksize = alg->cra_blocksize;
	200	rhash.digestsize = salg->digestsize;
	201
	202	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
	203	}
	204
	205	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	206	__maybe_unused;
	207	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	208	{
	209	struct shash_alg *salg = __crypto_shash_alg(alg);
	210
	211	seq_printf(m, "type : shash\n");
	212	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	213	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	214	}
	215
	216	const struct crypto_type crypto_shash_type = {
	217	.extsize = crypto_alg_extsize,
	218	.init_tfm = crypto_shash_init_tfm,
	219	.free = crypto_shash_free_instance,
	220	#ifdef CONFIG_PROC_FS
	221	.show = crypto_shash_show,
	222	#endif
	223	#if IS_ENABLED(CONFIG_CRYPTO_USER)
	224	.report = crypto_shash_report,
	225	#endif
	226	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	227	.maskset = CRYPTO_ALG_TYPE_MASK,
	228	.type = CRYPTO_ALG_TYPE_SHASH,
	229	.tfmsize = offsetof(struct crypto_shash, base),
	230	};
	231
	232	int crypto_grab_shash(struct crypto_shash_spawn *spawn,
	233	struct crypto_instance *inst,
	234	const char *name, u32 type, u32 mask)
	235	{
	236	spawn->base.frontend = &crypto_shash_type;
	237	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
	238	}
	239	EXPORT_SYMBOL_GPL(crypto_grab_shash);
	240
	241	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	242	u32 mask)
	243	{
	244	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
	245	}
	246	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	247
	248	int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
	249	{
	250	return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
	251	}
	252	EXPORT_SYMBOL_GPL(crypto_has_shash);
	253
	254	struct crypto_shash crypto_clone_shash(struct crypto_shash hash)
	255	{
	256	struct crypto_tfm *tfm = crypto_shash_tfm(hash);
	257	struct shash_alg *alg = crypto_shash_alg(hash);
	258	struct crypto_shash *nhash;
	259	int err;
	260
	261	if (!crypto_shash_alg_has_setkey(alg)) {
	262	tfm = crypto_tfm_get(tfm);
	263	if (IS_ERR(tfm))
	264	return ERR_CAST(tfm);
	265
	266	return hash;
	267	}
	268
	269	if (!alg->clone_tfm && (alg->init_tfm \|\| alg->base.cra_init))
	270	return ERR_PTR(-ENOSYS);
	271
	272	nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
	273	if (IS_ERR(nhash))
	274	return nhash;
	275
	276	nhash->descsize = hash->descsize;
	277
	278	if (alg->clone_tfm) {
	279	err = alg->clone_tfm(nhash, hash);
	280	if (err) {
	281	crypto_free_shash(nhash);
	282	return ERR_PTR(err);
	283	}
	284	}
	285
	286	return nhash;
	287	}
	288	EXPORT_SYMBOL_GPL(crypto_clone_shash);
	289
	290	int hash_prepare_alg(struct hash_alg_common *alg)
	291	{
	292	struct crypto_alg *base = &alg->base;
	293
	294	if (alg->digestsize > HASH_MAX_DIGESTSIZE)
	295	return -EINVAL;
	296
	297	/* alignmask is not useful for hashes, so it is not supported. */
	298	if (base->cra_alignmask)
	299	return -EINVAL;
	300
	301	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	302
	303	return 0;
	304	}
	305
	306	static int shash_prepare_alg(struct shash_alg *alg)
	307	{
	308	struct crypto_alg *base = &alg->halg.base;
	309	int err;
	310
	311	if (alg->descsize > HASH_MAX_DESCSIZE)
	312	return -EINVAL;
	313
	314	if ((alg->export && !alg->import) \|\| (alg->import && !alg->export))
	315	return -EINVAL;
	316
	317	err = hash_prepare_alg(&alg->halg);
	318	if (err)
	319	return err;
	320
	321	base->cra_type = &crypto_shash_type;
	322	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
	323
	324	/*
	325	* Handle missing optional functions. For each one we can either
	326	* install a default here, or we can leave the pointer as NULL and check
	327	* the pointer for NULL in crypto_shash_*(), avoiding an indirect call
	328	* when the default behavior is desired. For ->finup and ->digest we
	329	* install defaults, since for optimal performance algorithms should
	330	* implement these anyway. On the other hand, for ->import and
	331	* ->export the common case and best performance comes from the simple
	332	* memcpy of the shash_desc_ctx, so when those pointers are NULL we
	333	* leave them NULL and provide the memcpy with no indirect call.
	334	*/
	335	if (!alg->finup)
	336	alg->finup = shash_default_finup;
	337	if (!alg->digest)
	338	alg->digest = shash_default_digest;
	339	if (!alg->export)
	340	alg->halg.statesize = alg->descsize;
	341	if (!alg->setkey)
	342	alg->setkey = shash_no_setkey;
	343
	344	return 0;
	345	}
	346
	347	int crypto_register_shash(struct shash_alg *alg)
	348	{
	349	struct crypto_alg *base = &alg->base;
	350	int err;
	351
	352	err = shash_prepare_alg(alg);
	353	if (err)
	354	return err;
	355
	356	return crypto_register_alg(base);
	357	}
	358	EXPORT_SYMBOL_GPL(crypto_register_shash);
	359
	360	void crypto_unregister_shash(struct shash_alg *alg)
	361	{
	362	crypto_unregister_alg(&alg->base);
	363	}
	364	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	365
	366	int crypto_register_shashes(struct shash_alg *algs, int count)
	367	{
	368	int i, ret;
	369
	370	for (i = 0; i < count; i++) {
	371	ret = crypto_register_shash(&algs[i]);
	372	if (ret)
	373	goto err;
	374	}
	375
	376	return 0;
	377
	378	err:
	379	for (--i; i >= 0; --i)
	380	crypto_unregister_shash(&algs[i]);
	381
	382	return ret;
	383	}
	384	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	385
	386	void crypto_unregister_shashes(struct shash_alg *algs, int count)
	387	{
	388	int i;
	389
	390	for (i = count - 1; i >= 0; --i)
	391	crypto_unregister_shash(&algs[i]);
	392	}
	393	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	394
	395	int shash_register_instance(struct crypto_template *tmpl,
	396	struct shash_instance *inst)
	397	{
	398	int err;
	399
	400	if (WARN_ON(!inst->free))
	401	return -EINVAL;
	402
	403	err = shash_prepare_alg(&inst->alg);
	404	if (err)
	405	return err;
	406
	407	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	408	}
	409	EXPORT_SYMBOL_GPL(shash_register_instance);
	410
	411	void shash_free_singlespawn_instance(struct shash_instance *inst)
	412	{
	413	crypto_drop_spawn(shash_instance_ctx(inst));
	414	kfree(inst);
	415	}
	416	EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
	417
	418	MODULE_LICENSE("GPL");
	419	MODULE_DESCRIPTION("Synchronous cryptographic hash type");