[linux.git] / crypto / shash.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Synchronous Cryptographic Hash operations.
 *
 * Copyright (c) 2008 Herbert Xu <[email protected]>
 */

#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"

#define MAX_SHASH_ALIGNMASK 63

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);
	kfree_sensitive(buffer);
	return err;
}

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);
	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_SHASH_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_SHASH_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);

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);

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 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);
}

#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,
	.free = crypto_shash_free_instance,
#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),
};

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);

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 (base->cra_alignmask > MAX_SHASH_ALIGNMASK)
		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);

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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
7b5a080b HX	2	/*
	3	* Synchronous Cryptographic Hash operations.
	4	*
	5	* Copyright (c) 2008 Herbert Xu <[email protected]>
7b5a080b HX	6	*/
7b5a080b HX	7
3b2f6df0	8	#include <crypto/scatterwalk.h>
7b5a080b HX	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>
f4d663ce SK	15	#include <linux/cryptouser.h>
f4d663ce SK	16	#include <net/netlink.h>
d8c34b94	17	#include <linux/compiler.h>
7b5a080b	18
3b2f6df0 HX	19	#include "internal.h"
3b2f6df0 HX	20
1c799571 HX	21	#define MAX_SHASH_ALIGNMASK 63
1c799571 HX	22
3f683d61 HX	23	static const struct crypto_type crypto_shash_type;
3f683d61 HX	24
c060e16d EB	25	int shash_no_setkey(struct crypto_shash tfm, const u8 key,
c060e16d EB	26	unsigned int keylen)
57cfe44b HX	27	{
	28	return -ENOSYS;
	29	}
c060e16d	30	EXPORT_SYMBOL_GPL(shash_no_setkey);
57cfe44b	31
7b5a080b HX	32	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	33	unsigned int keylen)
	34	{
	35	struct shash_alg *shash = crypto_shash_alg(tfm);
	36	unsigned long alignmask = crypto_shash_alignmask(tfm);
	37	unsigned long absize;
	38	u8 buffer, alignbuffer;
	39	int err;
	40
18eb8ea6	41	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
9039f3ef	42	buffer = kmalloc(absize, GFP_ATOMIC);
7b5a080b HX	43	if (!buffer)
	44	return -ENOMEM;
	45
	46	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	47	memcpy(alignbuffer, key, keylen);
	48	err = shash->setkey(tfm, alignbuffer, keylen);
453431a5	49	kfree_sensitive(buffer);
7b5a080b HX	50	return err;
	51	}
	52
ba7d7433 EB	53	static void shash_set_needkey(struct crypto_shash tfm, struct shash_alg alg)
ba7d7433 EB	54	{
c2881789	55	if (crypto_shash_alg_needs_key(alg))
ba7d7433 EB	56	crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
	57	}
	58
7b5a080b HX	59	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	60	unsigned int keylen)
	61	{
	62	struct shash_alg *shash = crypto_shash_alg(tfm);
	63	unsigned long alignmask = crypto_shash_alignmask(tfm);
9fa68f62	64	int err;
7b5a080b HX	65
7b5a080b HX	66	if ((unsigned long)key & alignmask)
9fa68f62 EB	67	err = shash_setkey_unaligned(tfm, key, keylen);
	68	else
	69	err = shash->setkey(tfm, key, keylen);
	70
ba7d7433 EB	71	if (unlikely(err)) {
ba7d7433 EB	72	shash_set_needkey(tfm, shash);
9fa68f62	73	return err;
ba7d7433	74	}
7b5a080b	75
9fa68f62 EB	76	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
9fa68f62 EB	77	return 0;
7b5a080b HX	78	}
	79	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	80
7b5a080b HX	81	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	82	unsigned int len)
	83	{
	84	struct crypto_shash *tfm = desc->tfm;
	85	struct shash_alg *shash = crypto_shash_alg(tfm);
	86	unsigned long alignmask = crypto_shash_alignmask(tfm);
	87	unsigned int unaligned_len = alignmask + 1 -
	88	((unsigned long)data & alignmask);
f3569fd6 KC	89	/*
	90	* We cannot count on __aligned() working for large values:
	91	* https://patchwork.kernel.org/patch/9507697/
	92	*/
1c799571	93	u8 ubuf[MAX_SHASH_ALIGNMASK * 2];
0e2d3a12	94	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	95	int err;
7b5a080b	96
f3569fd6 KC	97	if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
	98	return -EINVAL;
	99
f4f68993 YS	100	if (unaligned_len > len)
	101	unaligned_len = len;
	102
7b5a080b	103	memcpy(buf, data, unaligned_len);
8c32c516 HX	104	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	105	memset(buf, 0, unaligned_len);
7b5a080b	106
8c32c516	107	return err ?:
7b5a080b HX	108	shash->update(desc, data + unaligned_len, len - unaligned_len);
	109	}
	110
	111	int crypto_shash_update(struct shash_desc desc, const u8 data,
	112	unsigned int len)
	113	{
	114	struct crypto_shash *tfm = desc->tfm;
	115	struct shash_alg *shash = crypto_shash_alg(tfm);
	116	unsigned long alignmask = crypto_shash_alignmask(tfm);
	117
	118	if ((unsigned long)data & alignmask)
	119	return shash_update_unaligned(desc, data, len);
	120
	121	return shash->update(desc, data, len);
	122	}
	123	EXPORT_SYMBOL_GPL(crypto_shash_update);
	124
	125	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	126	{
	127	struct crypto_shash *tfm = desc->tfm;
	128	unsigned long alignmask = crypto_shash_alignmask(tfm);
	129	struct shash_alg *shash = crypto_shash_alg(tfm);
	130	unsigned int ds = crypto_shash_digestsize(tfm);
f3569fd6 KC	131	/*
	132	* We cannot count on __aligned() working for large values:
	133	* https://patchwork.kernel.org/patch/9507697/
	134	*/
1c799571	135	u8 ubuf[MAX_SHASH_ALIGNMASK + HASH_MAX_DIGESTSIZE];
0e2d3a12	136	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	137	int err;
7b5a080b HX	138
f3569fd6 KC	139	if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
	140	return -EINVAL;
	141
7b5a080b	142	err = shash->final(desc, buf);
8c32c516 HX	143	if (err)
	144	goto out;
	145
7b5a080b	146	memcpy(out, buf, ds);
8c32c516 HX	147
	148	out:
	149	memset(buf, 0, ds);
7b5a080b HX	150	return err;
	151	}
	152
	153	int crypto_shash_final(struct shash_desc desc, u8 out)
	154	{
	155	struct crypto_shash *tfm = desc->tfm;
	156	struct shash_alg *shash = crypto_shash_alg(tfm);
	157	unsigned long alignmask = crypto_shash_alignmask(tfm);
	158
	159	if ((unsigned long)out & alignmask)
	160	return shash_final_unaligned(desc, out);
	161
	162	return shash->final(desc, out);
	163	}
	164	EXPORT_SYMBOL_GPL(crypto_shash_final);
	165
	166	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	167	unsigned int len, u8 *out)
	168	{
	169	return crypto_shash_update(desc, data, len) ?:
	170	crypto_shash_final(desc, out);
	171	}
	172
	173	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	174	unsigned int len, u8 *out)
	175	{
	176	struct crypto_shash *tfm = desc->tfm;
	177	struct shash_alg *shash = crypto_shash_alg(tfm);
	178	unsigned long alignmask = crypto_shash_alignmask(tfm);
	179
8267adab	180	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	181	return shash_finup_unaligned(desc, data, len, out);
	182
	183	return shash->finup(desc, data, len, out);
	184	}
	185	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	186
	187	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	188	unsigned int len, u8 *out)
	189	{
	190	return crypto_shash_init(desc) ?:
f88ad8de	191	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	192	}
	193
	194	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	195	unsigned int len, u8 *out)
	196	{
	197	struct crypto_shash *tfm = desc->tfm;
	198	struct shash_alg *shash = crypto_shash_alg(tfm);
	199	unsigned long alignmask = crypto_shash_alignmask(tfm);
	200
9fa68f62 EB	201	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	202	return -ENOKEY;
	203
8267adab	204	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	205	return shash_digest_unaligned(desc, data, len, out);
	206
	207	return shash->digest(desc, data, len, out);
	208	}
	209	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	210
822a98b8 EB	211	int crypto_shash_tfm_digest(struct crypto_shash tfm, const u8 data,
	212	unsigned int len, u8 *out)
	213	{
	214	SHASH_DESC_ON_STACK(desc, tfm);
	215	int err;
	216
	217	desc->tfm = tfm;
	218
	219	err = crypto_shash_digest(desc, data, len, out);
	220
	221	shash_desc_zero(desc);
	222
	223	return err;
	224	}
	225	EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
	226
f592682f	227	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	228	{
f592682f HX	229	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	230	return 0;
99d27e1c	231	}
dec8b786	232
f592682f	233	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	234	{
f592682f HX	235	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	236	return 0;
dec8b786	237	}
dec8b786	238
3b2f6df0 HX	239	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	240	unsigned int keylen)
	241	{
	242	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	243
	244	return crypto_shash_setkey(*ctx, key, keylen);
	245	}
	246
	247	static int shash_async_init(struct ahash_request *req)
	248	{
	249	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	250	struct shash_desc *desc = ahash_request_ctx(req);
	251
	252	desc->tfm = *ctx;
3b2f6df0 HX	253
	254	return crypto_shash_init(desc);
	255	}
	256
7eddf95e	257	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	258	{
3b2f6df0 HX	259	struct crypto_hash_walk walk;
	260	int nbytes;
	261
	262	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	263	nbytes = crypto_hash_walk_done(&walk, nbytes))
	264	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	265
	266	return nbytes;
	267	}
7eddf95e HX	268	EXPORT_SYMBOL_GPL(shash_ahash_update);
	269
	270	static int shash_async_update(struct ahash_request *req)
	271	{
	272	return shash_ahash_update(req, ahash_request_ctx(req));
	273	}
3b2f6df0 HX	274
	275	static int shash_async_final(struct ahash_request *req)
	276	{
	277	return crypto_shash_final(ahash_request_ctx(req), req->result);
	278	}
	279
66f6ce5e HX	280	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	281	{
	282	struct crypto_hash_walk walk;
	283	int nbytes;
	284
cbc86b91 HX	285	nbytes = crypto_hash_walk_first(req, &walk);
	286	if (!nbytes)
	287	return crypto_shash_final(desc, req->result);
	288
	289	do {
66f6ce5e HX	290	nbytes = crypto_hash_walk_last(&walk) ?
	291	crypto_shash_finup(desc, walk.data, nbytes,
	292	req->result) :
	293	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	294	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	295	} while (nbytes > 0);
66f6ce5e HX	296
	297	return nbytes;
	298	}
	299	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	300
	301	static int shash_async_finup(struct ahash_request *req)
	302	{
	303	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	304	struct shash_desc *desc = ahash_request_ctx(req);
	305
	306	desc->tfm = *ctx;
66f6ce5e HX	307
	308	return shash_ahash_finup(req, desc);
	309	}
	310
7eddf95e	311	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0	312	{
3b2f6df0	313	unsigned int nbytes = req->nbytes;
b61907bb HX	314	struct scatterlist *sg;
b61907bb HX	315	unsigned int offset;
3b2f6df0 HX	316	int err;
3b2f6df0 HX	317
b61907bb HX	318	if (nbytes &&
b61907bb HX	319	(sg = req->src, offset = sg->offset,
67cb60e4	320	nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
3b2f6df0 HX	321	void *data;
3b2f6df0 HX	322
f0dfc0b0	323	data = kmap_atomic(sg_page(sg));
3b2f6df0 HX	324	err = crypto_shash_digest(desc, data + offset, nbytes,
3b2f6df0 HX	325	req->result);
f0dfc0b0	326	kunmap_atomic(data);
7eddf95e HX	327	} else
7eddf95e HX	328	err = crypto_shash_init(desc) ?:
66f6ce5e	329	shash_ahash_finup(req, desc);
3b2f6df0	330
7eddf95e HX	331	return err;
	332	}
	333	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	334
7eddf95e HX	335	static int shash_async_digest(struct ahash_request *req)
	336	{
	337	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	338	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	339
7eddf95e	340	desc->tfm = *ctx;
3b2f6df0	341
7eddf95e	342	return shash_ahash_digest(req, desc);
3b2f6df0 HX	343	}
3b2f6df0 HX	344
66f6ce5e HX	345	static int shash_async_export(struct ahash_request req, void out)
	346	{
	347	return crypto_shash_export(ahash_request_ctx(req), out);
	348	}
	349
	350	static int shash_async_import(struct ahash_request req, const void in)
	351	{
90246e79 HX	352	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	353	struct shash_desc *desc = ahash_request_ctx(req);
	354
	355	desc->tfm = *ctx;
90246e79 HX	356
90246e79 HX	357	return crypto_shash_import(desc, in);
66f6ce5e HX	358	}
66f6ce5e HX	359
3b2f6df0 HX	360	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	361	{
	362	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	363
	364	crypto_free_shash(*ctx);
	365	}
	366
88056ec3	367	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	368	{
3b2f6df0 HX	369	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	370	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	371	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	372	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	373	struct crypto_shash *shash;
	374
	375	if (!crypto_mod_get(calg))
	376	return -EAGAIN;
	377
3f683d61	378	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	379	if (IS_ERR(shash)) {
	380	crypto_mod_put(calg);
	381	return PTR_ERR(shash);
	382	}
	383
	384	*ctx = shash;
	385	tfm->exit = crypto_exit_shash_ops_async;
	386
	387	crt->init = shash_async_init;
	388	crt->update = shash_async_update;
66f6ce5e HX	389	crt->final = shash_async_final;
66f6ce5e HX	390	crt->finup = shash_async_finup;
3b2f6df0	391	crt->digest = shash_async_digest;
ba7d7433 EB	392	if (crypto_shash_alg_has_setkey(alg))
ba7d7433 EB	393	crt->setkey = shash_async_setkey;
00420a65	394
9fa68f62 EB	395	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
9fa68f62 EB	396	CRYPTO_TFM_NEED_KEY);
66f6ce5e	397
2b091e32 EB	398	crt->export = shash_async_export;
2b091e32 EB	399	crt->import = shash_async_import;
3b2f6df0	400
3b2f6df0 HX	401	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	402
	403	return 0;
	404	}
	405
fbce6be5 HX	406	static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
	407	{
	408	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	409	struct shash_alg *alg = crypto_shash_alg(hash);
	410
	411	alg->exit_tfm(hash);
	412	}
	413
2ca33da1	414	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	415	{
113adefc	416	struct crypto_shash *hash = __crypto_shash_cast(tfm);
9fa68f62	417	struct shash_alg *alg = crypto_shash_alg(hash);
fbce6be5	418	int err;
9fa68f62 EB	419
	420	hash->descsize = alg->descsize;
	421
ba7d7433	422	shash_set_needkey(hash, alg);
113adefc	423
fbce6be5 HX	424	if (alg->exit_tfm)
	425	tfm->exit = crypto_shash_exit_tfm;
	426
	427	if (!alg->init_tfm)
	428	return 0;
	429
	430	err = alg->init_tfm(hash);
	431	if (err)
	432	return err;
	433
	434	/* ->init_tfm() may have increased the descsize. */
	435	if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
	436	if (alg->exit_tfm)
	437	alg->exit_tfm(hash);
	438	return -EINVAL;
	439	}
	440
7b5a080b HX	441	return 0;
	442	}
	443
48fb3e57 EB	444	static void crypto_shash_free_instance(struct crypto_instance *inst)
	445	{
	446	struct shash_instance *shash = shash_instance(inst);
	447
48fb3e57 EB	448	shash->free(shash);
	449	}
	450
3acc8473	451	#ifdef CONFIG_NET
f4d663ce SK	452	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	453	{
	454	struct crypto_report_hash rhash;
	455	struct shash_alg *salg = __crypto_shash_alg(alg);
	456
37db69e0 EB	457	memset(&rhash, 0, sizeof(rhash));
	458
	459	strscpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf	460
f4d663ce SK	461	rhash.blocksize = alg->cra_blocksize;
	462	rhash.digestsize = salg->digestsize;
	463
37db69e0	464	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
f4d663ce	465	}
3acc8473 HX	466	#else
	467	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	468	{
	469	return -ENOSYS;
	470	}
	471	#endif
f4d663ce	472
7b5a080b	473	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	474	__maybe_unused;
7b5a080b HX	475	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	476	{
	477	struct shash_alg *salg = __crypto_shash_alg(alg);
	478
	479	seq_printf(m, "type : shash\n");
	480	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	481	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	482	}
	483
	484	static const struct crypto_type crypto_shash_type = {
ac611680	485	.extsize = crypto_alg_extsize,
7b5a080b	486	.init_tfm = crypto_shash_init_tfm,
48fb3e57	487	.free = crypto_shash_free_instance,
7b5a080b HX	488	#ifdef CONFIG_PROC_FS
	489	.show = crypto_shash_show,
	490	#endif
f4d663ce	491	.report = crypto_shash_report,
7b5a080b HX	492	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	493	.maskset = CRYPTO_ALG_TYPE_MASK,
	494	.type = CRYPTO_ALG_TYPE_SHASH,
	495	.tfmsize = offsetof(struct crypto_shash, base),
	496	};
	497
fdfad1ff EB	498	int crypto_grab_shash(struct crypto_shash_spawn *spawn,
	499	struct crypto_instance *inst,
	500	const char *name, u32 type, u32 mask)
	501	{
	502	spawn->base.frontend = &crypto_shash_type;
	503	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
	504	}
	505	EXPORT_SYMBOL_GPL(crypto_grab_shash);
	506
7b5a080b HX	507	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	508	u32 mask)
	509	{
3f683d61	510	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	511	}
	512	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	513
85cc4243 HR	514	int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
	515	{
	516	return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
	517	}
	518	EXPORT_SYMBOL_GPL(crypto_has_shash);
	519
619a6ebd	520	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	521	{
	522	struct crypto_alg *base = &alg->base;
	523
b68a7ec1 KC	524	if (alg->digestsize > HASH_MAX_DIGESTSIZE \|\|
	525	alg->descsize > HASH_MAX_DESCSIZE \|\|
	526	alg->statesize > HASH_MAX_STATESIZE)
7b5a080b HX	527	return -EINVAL;
7b5a080b HX	528
1c799571 HX	529	if (base->cra_alignmask > MAX_SHASH_ALIGNMASK)
	530	return -EINVAL;
	531
41a2e94f EB	532	if ((alg->export && !alg->import) \|\| (alg->import && !alg->export))
	533	return -EINVAL;
	534
7b5a080b HX	535	base->cra_type = &crypto_shash_type;
	536	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	537	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	538
8267adab HX	539	if (!alg->finup)
	540	alg->finup = shash_finup_unaligned;
	541	if (!alg->digest)
	542	alg->digest = shash_digest_unaligned;
f592682f HX	543	if (!alg->export) {
	544	alg->export = shash_default_export;
	545	alg->import = shash_default_import;
	546	alg->statesize = alg->descsize;
	547	}
57cfe44b HX	548	if (!alg->setkey)
57cfe44b HX	549	alg->setkey = shash_no_setkey;
99d27e1c	550
619a6ebd HX	551	return 0;
	552	}
	553
	554	int crypto_register_shash(struct shash_alg *alg)
	555	{
	556	struct crypto_alg *base = &alg->base;
	557	int err;
	558
	559	err = shash_prepare_alg(alg);
	560	if (err)
	561	return err;
7b5a080b HX	562
	563	return crypto_register_alg(base);
	564	}
	565	EXPORT_SYMBOL_GPL(crypto_register_shash);
	566
c6d633a9	567	void crypto_unregister_shash(struct shash_alg *alg)
7b5a080b	568	{
c6d633a9	569	crypto_unregister_alg(&alg->base);
7b5a080b HX	570	}
	571	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	572
50fc3e8d JK	573	int crypto_register_shashes(struct shash_alg *algs, int count)
	574	{
	575	int i, ret;
	576
	577	for (i = 0; i < count; i++) {
	578	ret = crypto_register_shash(&algs[i]);
	579	if (ret)
	580	goto err;
	581	}
	582
	583	return 0;
	584
	585	err:
	586	for (--i; i >= 0; --i)
	587	crypto_unregister_shash(&algs[i]);
	588
	589	return ret;
	590	}
	591	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	592
c6d633a9	593	void crypto_unregister_shashes(struct shash_alg *algs, int count)
50fc3e8d	594	{
c6d633a9	595	int i;
50fc3e8d	596
c6d633a9 EB	597	for (i = count - 1; i >= 0; --i)
c6d633a9 EB	598	crypto_unregister_shash(&algs[i]);
50fc3e8d JK	599	}
	600	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	601
619a6ebd HX	602	int shash_register_instance(struct crypto_template *tmpl,
	603	struct shash_instance *inst)
	604	{
	605	int err;
	606
d4fdc2df EB	607	if (WARN_ON(!inst->free))
	608	return -EINVAL;
	609
619a6ebd HX	610	err = shash_prepare_alg(&inst->alg);
	611	if (err)
	612	return err;
	613
	614	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	615	}
	616	EXPORT_SYMBOL_GPL(shash_register_instance);
	617
a39c66cc	618	void shash_free_singlespawn_instance(struct shash_instance *inst)
2e4fddd8	619	{
a39c66cc EB	620	crypto_drop_spawn(shash_instance_ctx(inst));
a39c66cc EB	621	kfree(inst);
2e4fddd8	622	}
a39c66cc	623	EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
2e4fddd8	624
7b5a080b HX	625	MODULE_LICENSE("GPL");
7b5a080b HX	626	MODULE_DESCRIPTION("Synchronous cryptographic hash type");