[linux.git] / crypto / shash.c

/*
 * Synchronous Cryptographic Hash operations.
 *
 * Copyright (c) 2008 Herbert Xu <[email protected]>
 *
 * 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;
}

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 (err)
		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;
	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;

	if (crypto_shash_alg_has_setkey(alg) &&
	    !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
		crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);

	return 0;
}

#ifdef CONFIG_NET
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_hash rhash;
	struct shash_alg *salg = __crypto_shash_alg(alg);

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

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

	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
		    sizeof(struct crypto_report_hash), &rhash))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
	__maybe_unused;
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct shash_alg *salg = __crypto_shash_alg(alg);

	seq_printf(m, "type         : shash\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
}

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

struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
					u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_shash);

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

	if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
	    alg->descsize > HASH_MAX_DESCSIZE ||
	    alg->statesize > HASH_MAX_STATESIZE)
		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 <[email protected]>
	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
	56	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	57	unsigned int keylen)
	58	{
	59	struct shash_alg *shash = crypto_shash_alg(tfm);
	60	unsigned long alignmask = crypto_shash_alignmask(tfm);
9fa68f62	61	int err;
7b5a080b HX	62
7b5a080b HX	63	if ((unsigned long)key & alignmask)
9fa68f62 EB	64	err = shash_setkey_unaligned(tfm, key, keylen);
	65	else
	66	err = shash->setkey(tfm, key, keylen);
	67
	68	if (err)
	69	return err;
7b5a080b	70
9fa68f62 EB	71	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
9fa68f62 EB	72	return 0;
7b5a080b HX	73	}
	74	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	75
7b5a080b HX	76	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	77	unsigned int len)
	78	{
	79	struct crypto_shash *tfm = desc->tfm;
	80	struct shash_alg *shash = crypto_shash_alg(tfm);
	81	unsigned long alignmask = crypto_shash_alignmask(tfm);
	82	unsigned int unaligned_len = alignmask + 1 -
	83	((unsigned long)data & alignmask);
f3569fd6 KC	84	/*
	85	* We cannot count on __aligned() working for large values:
	86	* https://patchwork.kernel.org/patch/9507697/
	87	*/
	88	u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
0e2d3a12	89	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	90	int err;
7b5a080b	91
f3569fd6 KC	92	if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
	93	return -EINVAL;
	94
f4f68993 YS	95	if (unaligned_len > len)
	96	unaligned_len = len;
	97
7b5a080b	98	memcpy(buf, data, unaligned_len);
8c32c516 HX	99	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	100	memset(buf, 0, unaligned_len);
7b5a080b	101
8c32c516	102	return err ?:
7b5a080b HX	103	shash->update(desc, data + unaligned_len, len - unaligned_len);
	104	}
	105
	106	int crypto_shash_update(struct shash_desc desc, const u8 data,
	107	unsigned int len)
	108	{
	109	struct crypto_shash *tfm = desc->tfm;
	110	struct shash_alg *shash = crypto_shash_alg(tfm);
	111	unsigned long alignmask = crypto_shash_alignmask(tfm);
	112
	113	if ((unsigned long)data & alignmask)
	114	return shash_update_unaligned(desc, data, len);
	115
	116	return shash->update(desc, data, len);
	117	}
	118	EXPORT_SYMBOL_GPL(crypto_shash_update);
	119
	120	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	121	{
	122	struct crypto_shash *tfm = desc->tfm;
	123	unsigned long alignmask = crypto_shash_alignmask(tfm);
	124	struct shash_alg *shash = crypto_shash_alg(tfm);
	125	unsigned int ds = crypto_shash_digestsize(tfm);
f3569fd6 KC	126	/*
	127	* We cannot count on __aligned() working for large values:
	128	* https://patchwork.kernel.org/patch/9507697/
	129	*/
	130	u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
0e2d3a12	131	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	132	int err;
7b5a080b HX	133
f3569fd6 KC	134	if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
	135	return -EINVAL;
	136
7b5a080b	137	err = shash->final(desc, buf);
8c32c516 HX	138	if (err)
	139	goto out;
	140
7b5a080b	141	memcpy(out, buf, ds);
8c32c516 HX	142
	143	out:
	144	memset(buf, 0, ds);
7b5a080b HX	145	return err;
	146	}
	147
	148	int crypto_shash_final(struct shash_desc desc, u8 out)
	149	{
	150	struct crypto_shash *tfm = desc->tfm;
	151	struct shash_alg *shash = crypto_shash_alg(tfm);
	152	unsigned long alignmask = crypto_shash_alignmask(tfm);
	153
	154	if ((unsigned long)out & alignmask)
	155	return shash_final_unaligned(desc, out);
	156
	157	return shash->final(desc, out);
	158	}
	159	EXPORT_SYMBOL_GPL(crypto_shash_final);
	160
	161	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	162	unsigned int len, u8 *out)
	163	{
	164	return crypto_shash_update(desc, data, len) ?:
	165	crypto_shash_final(desc, out);
	166	}
	167
	168	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	169	unsigned int len, u8 *out)
	170	{
	171	struct crypto_shash *tfm = desc->tfm;
	172	struct shash_alg *shash = crypto_shash_alg(tfm);
	173	unsigned long alignmask = crypto_shash_alignmask(tfm);
	174
8267adab	175	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	176	return shash_finup_unaligned(desc, data, len, out);
	177
	178	return shash->finup(desc, data, len, out);
	179	}
	180	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	181
	182	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	183	unsigned int len, u8 *out)
	184	{
	185	return crypto_shash_init(desc) ?:
f88ad8de	186	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	187	}
	188
	189	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	190	unsigned int len, u8 *out)
	191	{
	192	struct crypto_shash *tfm = desc->tfm;
	193	struct shash_alg *shash = crypto_shash_alg(tfm);
	194	unsigned long alignmask = crypto_shash_alignmask(tfm);
	195
9fa68f62 EB	196	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	197	return -ENOKEY;
	198
8267adab	199	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	200	return shash_digest_unaligned(desc, data, len, out);
	201
	202	return shash->digest(desc, data, len, out);
	203	}
	204	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	205
f592682f	206	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	207	{
f592682f HX	208	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	209	return 0;
99d27e1c	210	}
dec8b786	211
f592682f	212	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	213	{
f592682f HX	214	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	215	return 0;
dec8b786	216	}
dec8b786	217
3b2f6df0 HX	218	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	219	unsigned int keylen)
	220	{
	221	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	222
	223	return crypto_shash_setkey(*ctx, key, keylen);
	224	}
	225
	226	static int shash_async_init(struct ahash_request *req)
	227	{
	228	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	229	struct shash_desc *desc = ahash_request_ctx(req);
	230
	231	desc->tfm = *ctx;
	232	desc->flags = req->base.flags;
	233
	234	return crypto_shash_init(desc);
	235	}
	236
7eddf95e	237	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	238	{
3b2f6df0 HX	239	struct crypto_hash_walk walk;
	240	int nbytes;
	241
	242	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	243	nbytes = crypto_hash_walk_done(&walk, nbytes))
	244	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	245
	246	return nbytes;
	247	}
7eddf95e HX	248	EXPORT_SYMBOL_GPL(shash_ahash_update);
	249
	250	static int shash_async_update(struct ahash_request *req)
	251	{
	252	return shash_ahash_update(req, ahash_request_ctx(req));
	253	}
3b2f6df0 HX	254
	255	static int shash_async_final(struct ahash_request *req)
	256	{
	257	return crypto_shash_final(ahash_request_ctx(req), req->result);
	258	}
	259
66f6ce5e HX	260	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	261	{
	262	struct crypto_hash_walk walk;
	263	int nbytes;
	264
cbc86b91 HX	265	nbytes = crypto_hash_walk_first(req, &walk);
	266	if (!nbytes)
	267	return crypto_shash_final(desc, req->result);
	268
	269	do {
66f6ce5e HX	270	nbytes = crypto_hash_walk_last(&walk) ?
	271	crypto_shash_finup(desc, walk.data, nbytes,
	272	req->result) :
	273	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	274	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	275	} while (nbytes > 0);
66f6ce5e HX	276
	277	return nbytes;
	278	}
	279	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	280
	281	static int shash_async_finup(struct ahash_request *req)
	282	{
	283	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	284	struct shash_desc *desc = ahash_request_ctx(req);
	285
	286	desc->tfm = *ctx;
	287	desc->flags = req->base.flags;
	288
	289	return shash_ahash_finup(req, desc);
	290	}
	291
7eddf95e	292	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0	293	{
3b2f6df0	294	unsigned int nbytes = req->nbytes;
b61907bb HX	295	struct scatterlist *sg;
b61907bb HX	296	unsigned int offset;
3b2f6df0 HX	297	int err;
3b2f6df0 HX	298
b61907bb HX	299	if (nbytes &&
	300	(sg = req->src, offset = sg->offset,
	301	nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
3b2f6df0 HX	302	void *data;
3b2f6df0 HX	303
f0dfc0b0	304	data = kmap_atomic(sg_page(sg));
3b2f6df0 HX	305	err = crypto_shash_digest(desc, data + offset, nbytes,
3b2f6df0 HX	306	req->result);
f0dfc0b0	307	kunmap_atomic(data);
3b2f6df0	308	crypto_yield(desc->flags);
7eddf95e HX	309	} else
7eddf95e HX	310	err = crypto_shash_init(desc) ?:
66f6ce5e	311	shash_ahash_finup(req, desc);
3b2f6df0	312
7eddf95e HX	313	return err;
	314	}
	315	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	316
7eddf95e HX	317	static int shash_async_digest(struct ahash_request *req)
	318	{
	319	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	320	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	321
7eddf95e HX	322	desc->tfm = *ctx;
7eddf95e HX	323	desc->flags = req->base.flags;
3b2f6df0	324
7eddf95e	325	return shash_ahash_digest(req, desc);
3b2f6df0 HX	326	}
3b2f6df0 HX	327
66f6ce5e HX	328	static int shash_async_export(struct ahash_request req, void out)
	329	{
	330	return crypto_shash_export(ahash_request_ctx(req), out);
	331	}
	332
	333	static int shash_async_import(struct ahash_request req, const void in)
	334	{
90246e79 HX	335	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	336	struct shash_desc *desc = ahash_request_ctx(req);
	337
	338	desc->tfm = *ctx;
	339	desc->flags = req->base.flags;
	340
	341	return crypto_shash_import(desc, in);
66f6ce5e HX	342	}
66f6ce5e HX	343
3b2f6df0 HX	344	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	345	{
	346	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	347
	348	crypto_free_shash(*ctx);
	349	}
	350
88056ec3	351	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	352	{
3b2f6df0 HX	353	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	354	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	355	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	356	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	357	struct crypto_shash *shash;
	358
	359	if (!crypto_mod_get(calg))
	360	return -EAGAIN;
	361
3f683d61	362	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	363	if (IS_ERR(shash)) {
	364	crypto_mod_put(calg);
	365	return PTR_ERR(shash);
	366	}
	367
	368	*ctx = shash;
	369	tfm->exit = crypto_exit_shash_ops_async;
	370
	371	crt->init = shash_async_init;
	372	crt->update = shash_async_update;
66f6ce5e HX	373	crt->final = shash_async_final;
66f6ce5e HX	374	crt->finup = shash_async_finup;
3b2f6df0	375	crt->digest = shash_async_digest;
00420a65 HX	376	crt->setkey = shash_async_setkey;
00420a65 HX	377
9fa68f62 EB	378	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
9fa68f62 EB	379	CRYPTO_TFM_NEED_KEY);
66f6ce5e	380
66f6ce5e HX	381	if (alg->export)
66f6ce5e HX	382	crt->export = shash_async_export;
0044f3ed	383	if (alg->import)
66f6ce5e	384	crt->import = shash_async_import;
3b2f6df0	385
3b2f6df0 HX	386	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	387
	388	return 0;
	389	}
	390
2ca33da1	391	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	392	{
113adefc	393	struct crypto_shash *hash = __crypto_shash_cast(tfm);
9fa68f62 EB	394	struct shash_alg *alg = crypto_shash_alg(hash);
	395
	396	hash->descsize = alg->descsize;
	397
	398	if (crypto_shash_alg_has_setkey(alg) &&
	399	!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
	400	crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
113adefc	401
7b5a080b HX	402	return 0;
	403	}
	404
3acc8473	405	#ifdef CONFIG_NET
f4d663ce SK	406	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	407	{
	408	struct crypto_report_hash rhash;
	409	struct shash_alg *salg = __crypto_shash_alg(alg);
	410
9a5467bf MK	411	strncpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf MK	412
f4d663ce SK	413	rhash.blocksize = alg->cra_blocksize;
	414	rhash.digestsize = salg->digestsize;
	415
6662df33 DM	416	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
	417	sizeof(struct crypto_report_hash), &rhash))
	418	goto nla_put_failure;
f4d663ce SK	419	return 0;
	420
	421	nla_put_failure:
	422	return -EMSGSIZE;
	423	}
3acc8473 HX	424	#else
	425	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	426	{
	427	return -ENOSYS;
	428	}
	429	#endif
f4d663ce	430
7b5a080b	431	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	432	__maybe_unused;
7b5a080b HX	433	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	434	{
	435	struct shash_alg *salg = __crypto_shash_alg(alg);
	436
	437	seq_printf(m, "type : shash\n");
	438	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	439	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	440	}
	441
	442	static const struct crypto_type crypto_shash_type = {
ac611680	443	.extsize = crypto_alg_extsize,
7b5a080b HX	444	.init_tfm = crypto_shash_init_tfm,
	445	#ifdef CONFIG_PROC_FS
	446	.show = crypto_shash_show,
	447	#endif
f4d663ce	448	.report = crypto_shash_report,
7b5a080b HX	449	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	450	.maskset = CRYPTO_ALG_TYPE_MASK,
	451	.type = CRYPTO_ALG_TYPE_SHASH,
	452	.tfmsize = offsetof(struct crypto_shash, base),
	453	};
	454
	455	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	456	u32 mask)
	457	{
3f683d61	458	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	459	}
	460	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	461
619a6ebd	462	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	463	{
	464	struct crypto_alg *base = &alg->base;
	465
b68a7ec1 KC	466	if (alg->digestsize > HASH_MAX_DIGESTSIZE \|\|
	467	alg->descsize > HASH_MAX_DESCSIZE \|\|
	468	alg->statesize > HASH_MAX_STATESIZE)
7b5a080b HX	469	return -EINVAL;
	470
	471	base->cra_type = &crypto_shash_type;
	472	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	473	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	474
8267adab HX	475	if (!alg->finup)
	476	alg->finup = shash_finup_unaligned;
	477	if (!alg->digest)
	478	alg->digest = shash_digest_unaligned;
f592682f HX	479	if (!alg->export) {
	480	alg->export = shash_default_export;
	481	alg->import = shash_default_import;
	482	alg->statesize = alg->descsize;
	483	}
57cfe44b HX	484	if (!alg->setkey)
57cfe44b HX	485	alg->setkey = shash_no_setkey;
99d27e1c	486
619a6ebd HX	487	return 0;
	488	}
	489
	490	int crypto_register_shash(struct shash_alg *alg)
	491	{
	492	struct crypto_alg *base = &alg->base;
	493	int err;
	494
	495	err = shash_prepare_alg(alg);
	496	if (err)
	497	return err;
7b5a080b HX	498
	499	return crypto_register_alg(base);
	500	}
	501	EXPORT_SYMBOL_GPL(crypto_register_shash);
	502
	503	int crypto_unregister_shash(struct shash_alg *alg)
	504	{
	505	return crypto_unregister_alg(&alg->base);
	506	}
	507	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	508
50fc3e8d JK	509	int crypto_register_shashes(struct shash_alg *algs, int count)
	510	{
	511	int i, ret;
	512
	513	for (i = 0; i < count; i++) {
	514	ret = crypto_register_shash(&algs[i]);
	515	if (ret)
	516	goto err;
	517	}
	518
	519	return 0;
	520
	521	err:
	522	for (--i; i >= 0; --i)
	523	crypto_unregister_shash(&algs[i]);
	524
	525	return ret;
	526	}
	527	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	528
	529	int crypto_unregister_shashes(struct shash_alg *algs, int count)
	530	{
	531	int i, ret;
	532
	533	for (i = count - 1; i >= 0; --i) {
	534	ret = crypto_unregister_shash(&algs[i]);
	535	if (ret)
	536	pr_err("Failed to unregister %s %s: %d\n",
	537	algs[i].base.cra_driver_name,
	538	algs[i].base.cra_name, ret);
	539	}
	540
	541	return 0;
	542	}
	543	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	544
619a6ebd HX	545	int shash_register_instance(struct crypto_template *tmpl,
	546	struct shash_instance *inst)
	547	{
	548	int err;
	549
	550	err = shash_prepare_alg(&inst->alg);
	551	if (err)
	552	return err;
	553
	554	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	555	}
	556	EXPORT_SYMBOL_GPL(shash_register_instance);
	557
2e4fddd8 HX	558	void shash_free_instance(struct crypto_instance *inst)
	559	{
	560	crypto_drop_spawn(crypto_instance_ctx(inst));
	561	kfree(shash_instance(inst));
	562	}
	563	EXPORT_SYMBOL_GPL(shash_free_instance);
	564
94296999 HX	565	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	566	struct shash_alg *alg,
	567	struct crypto_instance *inst)
	568	{
	569	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	570	&crypto_shash_type);
	571	}
	572	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	573
7d6f5640 HX	574	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	575	{
	576	struct crypto_alg *alg;
	577
	578	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	579	return IS_ERR(alg) ? ERR_CAST(alg) :
	580	container_of(alg, struct shash_alg, base);
	581	}
	582	EXPORT_SYMBOL_GPL(shash_attr_alg);
	583
7b5a080b HX	584	MODULE_LICENSE("GPL");
7b5a080b HX	585	MODULE_DESCRIPTION("Synchronous cryptographic hash type");