[thirdparty/kernel/linux.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;

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;
	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)
{
	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);
		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;
	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);

	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);
	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
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
af3ff804 EB	28	int shash_no_setkey(struct crypto_shash tfm, const u8 key,
af3ff804 EB	29	unsigned int keylen)
57cfe44b HX	30	{
	31	return -ENOSYS;
	32	}
af3ff804	33	EXPORT_SYMBOL_GPL(shash_no_setkey);
57cfe44b	34
7b5a080b HX	35	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	36	unsigned int keylen)
	37	{
	38	struct shash_alg *shash = crypto_shash_alg(tfm);
	39	unsigned long alignmask = crypto_shash_alignmask(tfm);
	40	unsigned long absize;
	41	u8 buffer, alignbuffer;
	42	int err;
	43
18eb8ea6	44	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
9039f3ef	45	buffer = kmalloc(absize, GFP_ATOMIC);
7b5a080b HX	46	if (!buffer)
	47	return -ENOMEM;
	48
	49	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	50	memcpy(alignbuffer, key, keylen);
	51	err = shash->setkey(tfm, alignbuffer, keylen);
8c32c516	52	kzfree(buffer);
7b5a080b HX	53	return err;
	54	}
	55
ba7d7433 EB	56	static void shash_set_needkey(struct crypto_shash tfm, struct shash_alg alg)
	57	{
	58	if (crypto_shash_alg_has_setkey(alg) &&
	59	!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
	60	crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
	61	}
	62
7b5a080b HX	63	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	64	unsigned int keylen)
	65	{
	66	struct shash_alg *shash = crypto_shash_alg(tfm);
	67	unsigned long alignmask = crypto_shash_alignmask(tfm);
9fa68f62	68	int err;
7b5a080b HX	69
7b5a080b HX	70	if ((unsigned long)key & alignmask)
9fa68f62 EB	71	err = shash_setkey_unaligned(tfm, key, keylen);
	72	else
	73	err = shash->setkey(tfm, key, keylen);
	74
ba7d7433 EB	75	if (unlikely(err)) {
ba7d7433 EB	76	shash_set_needkey(tfm, shash);
9fa68f62	77	return err;
ba7d7433	78	}
7b5a080b	79
9fa68f62 EB	80	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
9fa68f62 EB	81	return 0;
7b5a080b HX	82	}
	83	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	84
7b5a080b HX	85	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	86	unsigned int len)
	87	{
	88	struct crypto_shash *tfm = desc->tfm;
	89	struct shash_alg *shash = crypto_shash_alg(tfm);
	90	unsigned long alignmask = crypto_shash_alignmask(tfm);
	91	unsigned int unaligned_len = alignmask + 1 -
	92	((unsigned long)data & alignmask);
f3569fd6 KC	93	/*
	94	* We cannot count on __aligned() working for large values:
	95	* https://patchwork.kernel.org/patch/9507697/
	96	*/
	97	u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
0e2d3a12	98	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	99	int err;
7b5a080b	100
f3569fd6 KC	101	if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
	102	return -EINVAL;
	103
f4f68993 YS	104	if (unaligned_len > len)
	105	unaligned_len = len;
	106
7b5a080b	107	memcpy(buf, data, unaligned_len);
8c32c516 HX	108	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	109	memset(buf, 0, unaligned_len);
7b5a080b	110
8c32c516	111	return err ?:
7b5a080b HX	112	shash->update(desc, data + unaligned_len, len - unaligned_len);
	113	}
	114
	115	int crypto_shash_update(struct shash_desc desc, const u8 data,
	116	unsigned int len)
	117	{
	118	struct crypto_shash *tfm = desc->tfm;
	119	struct shash_alg *shash = crypto_shash_alg(tfm);
	120	unsigned long alignmask = crypto_shash_alignmask(tfm);
	121
	122	if ((unsigned long)data & alignmask)
	123	return shash_update_unaligned(desc, data, len);
	124
	125	return shash->update(desc, data, len);
	126	}
	127	EXPORT_SYMBOL_GPL(crypto_shash_update);
	128
	129	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	130	{
	131	struct crypto_shash *tfm = desc->tfm;
	132	unsigned long alignmask = crypto_shash_alignmask(tfm);
	133	struct shash_alg *shash = crypto_shash_alg(tfm);
	134	unsigned int ds = crypto_shash_digestsize(tfm);
f3569fd6 KC	135	/*
	136	* We cannot count on __aligned() working for large values:
	137	* https://patchwork.kernel.org/patch/9507697/
	138	*/
	139	u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
0e2d3a12	140	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	141	int err;
7b5a080b HX	142
f3569fd6 KC	143	if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
	144	return -EINVAL;
	145
7b5a080b	146	err = shash->final(desc, buf);
8c32c516 HX	147	if (err)
	148	goto out;
	149
7b5a080b	150	memcpy(out, buf, ds);
8c32c516 HX	151
	152	out:
	153	memset(buf, 0, ds);
7b5a080b HX	154	return err;
	155	}
	156
	157	int crypto_shash_final(struct shash_desc desc, u8 out)
	158	{
	159	struct crypto_shash *tfm = desc->tfm;
	160	struct shash_alg *shash = crypto_shash_alg(tfm);
	161	unsigned long alignmask = crypto_shash_alignmask(tfm);
	162
	163	if ((unsigned long)out & alignmask)
	164	return shash_final_unaligned(desc, out);
	165
	166	return shash->final(desc, out);
	167	}
	168	EXPORT_SYMBOL_GPL(crypto_shash_final);
	169
	170	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	171	unsigned int len, u8 *out)
	172	{
	173	return crypto_shash_update(desc, data, len) ?:
	174	crypto_shash_final(desc, out);
	175	}
	176
	177	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	178	unsigned int len, u8 *out)
	179	{
	180	struct crypto_shash *tfm = desc->tfm;
	181	struct shash_alg *shash = crypto_shash_alg(tfm);
	182	unsigned long alignmask = crypto_shash_alignmask(tfm);
	183
8267adab	184	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	185	return shash_finup_unaligned(desc, data, len, out);
	186
	187	return shash->finup(desc, data, len, out);
	188	}
	189	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	190
	191	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	192	unsigned int len, u8 *out)
	193	{
	194	return crypto_shash_init(desc) ?:
f88ad8de	195	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	196	}
	197
	198	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	199	unsigned int len, u8 *out)
	200	{
	201	struct crypto_shash *tfm = desc->tfm;
	202	struct shash_alg *shash = crypto_shash_alg(tfm);
	203	unsigned long alignmask = crypto_shash_alignmask(tfm);
	204
9fa68f62 EB	205	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	206	return -ENOKEY;
	207
8267adab	208	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	209	return shash_digest_unaligned(desc, data, len, out);
	210
	211	return shash->digest(desc, data, len, out);
	212	}
	213	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	214
f592682f	215	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	216	{
f592682f HX	217	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	218	return 0;
99d27e1c	219	}
dec8b786	220
f592682f	221	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	222	{
f592682f HX	223	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	224	return 0;
dec8b786	225	}
dec8b786	226
3b2f6df0 HX	227	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	228	unsigned int keylen)
	229	{
	230	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	231
	232	return crypto_shash_setkey(*ctx, key, keylen);
	233	}
	234
	235	static int shash_async_init(struct ahash_request *req)
	236	{
	237	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	238	struct shash_desc *desc = ahash_request_ctx(req);
	239
	240	desc->tfm = *ctx;
	241	desc->flags = req->base.flags;
	242
	243	return crypto_shash_init(desc);
	244	}
	245
7eddf95e	246	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	247	{
3b2f6df0 HX	248	struct crypto_hash_walk walk;
	249	int nbytes;
	250
	251	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	252	nbytes = crypto_hash_walk_done(&walk, nbytes))
	253	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	254
	255	return nbytes;
	256	}
7eddf95e HX	257	EXPORT_SYMBOL_GPL(shash_ahash_update);
	258
	259	static int shash_async_update(struct ahash_request *req)
	260	{
	261	return shash_ahash_update(req, ahash_request_ctx(req));
	262	}
3b2f6df0 HX	263
	264	static int shash_async_final(struct ahash_request *req)
	265	{
	266	return crypto_shash_final(ahash_request_ctx(req), req->result);
	267	}
	268
66f6ce5e HX	269	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	270	{
	271	struct crypto_hash_walk walk;
	272	int nbytes;
	273
cbc86b91 HX	274	nbytes = crypto_hash_walk_first(req, &walk);
	275	if (!nbytes)
	276	return crypto_shash_final(desc, req->result);
	277
	278	do {
66f6ce5e HX	279	nbytes = crypto_hash_walk_last(&walk) ?
	280	crypto_shash_finup(desc, walk.data, nbytes,
	281	req->result) :
	282	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	283	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	284	} while (nbytes > 0);
66f6ce5e HX	285
	286	return nbytes;
	287	}
	288	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	289
	290	static int shash_async_finup(struct ahash_request *req)
	291	{
	292	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	293	struct shash_desc *desc = ahash_request_ctx(req);
	294
	295	desc->tfm = *ctx;
	296	desc->flags = req->base.flags;
	297
	298	return shash_ahash_finup(req, desc);
	299	}
	300
7eddf95e	301	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0	302	{
3b2f6df0	303	unsigned int nbytes = req->nbytes;
b61907bb HX	304	struct scatterlist *sg;
b61907bb HX	305	unsigned int offset;
3b2f6df0 HX	306	int err;
3b2f6df0 HX	307
b61907bb HX	308	if (nbytes &&
	309	(sg = req->src, offset = sg->offset,
	310	nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
3b2f6df0 HX	311	void *data;
3b2f6df0 HX	312
f0dfc0b0	313	data = kmap_atomic(sg_page(sg));
3b2f6df0 HX	314	err = crypto_shash_digest(desc, data + offset, nbytes,
3b2f6df0 HX	315	req->result);
f0dfc0b0	316	kunmap_atomic(data);
3b2f6df0	317	crypto_yield(desc->flags);
7eddf95e HX	318	} else
7eddf95e HX	319	err = crypto_shash_init(desc) ?:
66f6ce5e	320	shash_ahash_finup(req, desc);
3b2f6df0	321
7eddf95e HX	322	return err;
	323	}
	324	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	325
7eddf95e HX	326	static int shash_async_digest(struct ahash_request *req)
	327	{
	328	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	329	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	330
7eddf95e HX	331	desc->tfm = *ctx;
7eddf95e HX	332	desc->flags = req->base.flags;
3b2f6df0	333
7eddf95e	334	return shash_ahash_digest(req, desc);
3b2f6df0 HX	335	}
3b2f6df0 HX	336
66f6ce5e HX	337	static int shash_async_export(struct ahash_request req, void out)
	338	{
	339	return crypto_shash_export(ahash_request_ctx(req), out);
	340	}
	341
	342	static int shash_async_import(struct ahash_request req, const void in)
	343	{
90246e79 HX	344	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	345	struct shash_desc *desc = ahash_request_ctx(req);
	346
	347	desc->tfm = *ctx;
	348	desc->flags = req->base.flags;
	349
	350	return crypto_shash_import(desc, in);
66f6ce5e HX	351	}
66f6ce5e HX	352
3b2f6df0 HX	353	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	354	{
	355	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	356
	357	crypto_free_shash(*ctx);
	358	}
	359
88056ec3	360	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	361	{
3b2f6df0 HX	362	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	363	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	364	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	365	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	366	struct crypto_shash *shash;
	367
	368	if (!crypto_mod_get(calg))
	369	return -EAGAIN;
	370
3f683d61	371	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	372	if (IS_ERR(shash)) {
	373	crypto_mod_put(calg);
	374	return PTR_ERR(shash);
	375	}
	376
	377	*ctx = shash;
	378	tfm->exit = crypto_exit_shash_ops_async;
	379
	380	crt->init = shash_async_init;
	381	crt->update = shash_async_update;
66f6ce5e HX	382	crt->final = shash_async_final;
66f6ce5e HX	383	crt->finup = shash_async_finup;
3b2f6df0	384	crt->digest = shash_async_digest;
ba7d7433 EB	385	if (crypto_shash_alg_has_setkey(alg))
ba7d7433 EB	386	crt->setkey = shash_async_setkey;
00420a65	387
9fa68f62 EB	388	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
9fa68f62 EB	389	CRYPTO_TFM_NEED_KEY);
66f6ce5e	390
66f6ce5e HX	391	if (alg->export)
66f6ce5e HX	392	crt->export = shash_async_export;
0044f3ed	393	if (alg->import)
66f6ce5e	394	crt->import = shash_async_import;
3b2f6df0	395
3b2f6df0 HX	396	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	397
	398	return 0;
	399	}
	400
2ca33da1	401	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	402	{
113adefc	403	struct crypto_shash *hash = __crypto_shash_cast(tfm);
9fa68f62 EB	404	struct shash_alg *alg = crypto_shash_alg(hash);
	405
	406	hash->descsize = alg->descsize;
	407
ba7d7433	408	shash_set_needkey(hash, alg);
113adefc	409
7b5a080b HX	410	return 0;
	411	}
	412
3acc8473	413	#ifdef CONFIG_NET
f4d663ce SK	414	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	415	{
	416	struct crypto_report_hash rhash;
	417	struct shash_alg *salg = __crypto_shash_alg(alg);
	418
37db69e0 EB	419	memset(&rhash, 0, sizeof(rhash));
	420
	421	strscpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf	422
f4d663ce SK	423	rhash.blocksize = alg->cra_blocksize;
	424	rhash.digestsize = salg->digestsize;
	425
37db69e0	426	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
f4d663ce	427	}
3acc8473 HX	428	#else
	429	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	430	{
	431	return -ENOSYS;
	432	}
	433	#endif
f4d663ce	434
7b5a080b	435	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	436	__maybe_unused;
7b5a080b HX	437	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	438	{
	439	struct shash_alg *salg = __crypto_shash_alg(alg);
	440
	441	seq_printf(m, "type : shash\n");
	442	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	443	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	444	}
	445
	446	static const struct crypto_type crypto_shash_type = {
ac611680	447	.extsize = crypto_alg_extsize,
7b5a080b HX	448	.init_tfm = crypto_shash_init_tfm,
	449	#ifdef CONFIG_PROC_FS
	450	.show = crypto_shash_show,
	451	#endif
f4d663ce	452	.report = crypto_shash_report,
7b5a080b HX	453	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	454	.maskset = CRYPTO_ALG_TYPE_MASK,
	455	.type = CRYPTO_ALG_TYPE_SHASH,
	456	.tfmsize = offsetof(struct crypto_shash, base),
	457	};
	458
	459	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	460	u32 mask)
	461	{
3f683d61	462	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	463	}
	464	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	465
619a6ebd	466	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	467	{
	468	struct crypto_alg *base = &alg->base;
	469
b68a7ec1 KC	470	if (alg->digestsize > HASH_MAX_DIGESTSIZE \|\|
	471	alg->descsize > HASH_MAX_DESCSIZE \|\|
	472	alg->statesize > HASH_MAX_STATESIZE)
7b5a080b HX	473	return -EINVAL;
7b5a080b HX	474
41a2e94f EB	475	if ((alg->export && !alg->import) \|\| (alg->import && !alg->export))
	476	return -EINVAL;
	477
7b5a080b HX	478	base->cra_type = &crypto_shash_type;
	479	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	480	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	481
8267adab HX	482	if (!alg->finup)
	483	alg->finup = shash_finup_unaligned;
	484	if (!alg->digest)
	485	alg->digest = shash_digest_unaligned;
f592682f HX	486	if (!alg->export) {
	487	alg->export = shash_default_export;
	488	alg->import = shash_default_import;
	489	alg->statesize = alg->descsize;
	490	}
57cfe44b HX	491	if (!alg->setkey)
57cfe44b HX	492	alg->setkey = shash_no_setkey;
99d27e1c	493
619a6ebd HX	494	return 0;
	495	}
	496
	497	int crypto_register_shash(struct shash_alg *alg)
	498	{
	499	struct crypto_alg *base = &alg->base;
	500	int err;
	501
	502	err = shash_prepare_alg(alg);
	503	if (err)
	504	return err;
7b5a080b HX	505
	506	return crypto_register_alg(base);
	507	}
	508	EXPORT_SYMBOL_GPL(crypto_register_shash);
	509
	510	int crypto_unregister_shash(struct shash_alg *alg)
	511	{
	512	return crypto_unregister_alg(&alg->base);
	513	}
	514	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	515
50fc3e8d JK	516	int crypto_register_shashes(struct shash_alg *algs, int count)
	517	{
	518	int i, ret;
	519
	520	for (i = 0; i < count; i++) {
	521	ret = crypto_register_shash(&algs[i]);
	522	if (ret)
	523	goto err;
	524	}
	525
	526	return 0;
	527
	528	err:
	529	for (--i; i >= 0; --i)
	530	crypto_unregister_shash(&algs[i]);
	531
	532	return ret;
	533	}
	534	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	535
	536	int crypto_unregister_shashes(struct shash_alg *algs, int count)
	537	{
	538	int i, ret;
	539
	540	for (i = count - 1; i >= 0; --i) {
	541	ret = crypto_unregister_shash(&algs[i]);
	542	if (ret)
	543	pr_err("Failed to unregister %s %s: %d\n",
	544	algs[i].base.cra_driver_name,
	545	algs[i].base.cra_name, ret);
	546	}
	547
	548	return 0;
	549	}
	550	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	551
619a6ebd HX	552	int shash_register_instance(struct crypto_template *tmpl,
	553	struct shash_instance *inst)
	554	{
	555	int err;
	556
	557	err = shash_prepare_alg(&inst->alg);
	558	if (err)
	559	return err;
	560
	561	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	562	}
	563	EXPORT_SYMBOL_GPL(shash_register_instance);
	564
2e4fddd8 HX	565	void shash_free_instance(struct crypto_instance *inst)
	566	{
	567	crypto_drop_spawn(crypto_instance_ctx(inst));
	568	kfree(shash_instance(inst));
	569	}
	570	EXPORT_SYMBOL_GPL(shash_free_instance);
	571
94296999 HX	572	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	573	struct shash_alg *alg,
	574	struct crypto_instance *inst)
	575	{
	576	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	577	&crypto_shash_type);
	578	}
	579	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	580
7d6f5640 HX	581	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	582	{
	583	struct crypto_alg *alg;
	584
	585	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	586	return IS_ERR(alg) ? ERR_CAST(alg) :
	587	container_of(alg, struct shash_alg, base);
	588	}
	589	EXPORT_SYMBOL_GPL(shash_attr_alg);
	590
7b5a080b HX	591	MODULE_LICENSE("GPL");
7b5a080b HX	592	MODULE_DESCRIPTION("Synchronous cryptographic hash type");