[mirror_ubuntu-bionic-kernel.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 inline unsigned int shash_align_buffer_size(unsigned len,
						   unsigned long mask)
{
	typedef u8 __aligned_largest u8_aligned;
	return len + (mask & ~(__alignof__(u8_aligned) - 1));
}

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);
	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
		__aligned_largest;
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	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);
	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
		__aligned_largest;
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	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);

	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 > PAGE_SIZE / 8 ||
	    alg->descsize > PAGE_SIZE / 8 ||
	    alg->statesize > PAGE_SIZE / 8)
		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
ff4a35c5 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);
65657355	68	int err;
7b5a080b HX	69
7b5a080b HX	70	if ((unsigned long)key & alignmask)
65657355 EB	71	err = shash_setkey_unaligned(tfm, key, keylen);
	72	else
	73	err = shash->setkey(tfm, key, keylen);
	74
ff4a35c5 EB	75	if (unlikely(err)) {
ff4a35c5 EB	76	shash_set_needkey(tfm, shash);
65657355	77	return err;
ff4a35c5	78	}
7b5a080b	79
65657355 EB	80	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
65657355 EB	81	return 0;
7b5a080b HX	82	}
	83	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	84
	85	static inline unsigned int shash_align_buffer_size(unsigned len,
	86	unsigned long mask)
	87	{
d8c34b94	88	typedef u8 __aligned_largest u8_aligned;
66d8ea57	89	return len + (mask & ~(__alignof__(u8_aligned) - 1));
7b5a080b HX	90	}
	91
	92	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	93	unsigned int len)
	94	{
	95	struct crypto_shash *tfm = desc->tfm;
	96	struct shash_alg *shash = crypto_shash_alg(tfm);
	97	unsigned long alignmask = crypto_shash_alignmask(tfm);
	98	unsigned int unaligned_len = alignmask + 1 -
	99	((unsigned long)data & alignmask);
0e2d3a12	100	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
d8c34b94	101	__aligned_largest;
0e2d3a12	102	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	103	int err;
7b5a080b	104
f4f68993 YS	105	if (unaligned_len > len)
	106	unaligned_len = len;
	107
7b5a080b	108	memcpy(buf, data, unaligned_len);
8c32c516 HX	109	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	110	memset(buf, 0, unaligned_len);
7b5a080b	111
8c32c516	112	return err ?:
7b5a080b HX	113	shash->update(desc, data + unaligned_len, len - unaligned_len);
	114	}
	115
	116	int crypto_shash_update(struct shash_desc desc, const u8 data,
	117	unsigned int len)
	118	{
	119	struct crypto_shash *tfm = desc->tfm;
	120	struct shash_alg *shash = crypto_shash_alg(tfm);
	121	unsigned long alignmask = crypto_shash_alignmask(tfm);
	122
	123	if ((unsigned long)data & alignmask)
	124	return shash_update_unaligned(desc, data, len);
	125
	126	return shash->update(desc, data, len);
	127	}
	128	EXPORT_SYMBOL_GPL(crypto_shash_update);
	129
	130	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	131	{
	132	struct crypto_shash *tfm = desc->tfm;
	133	unsigned long alignmask = crypto_shash_alignmask(tfm);
	134	struct shash_alg *shash = crypto_shash_alg(tfm);
	135	unsigned int ds = crypto_shash_digestsize(tfm);
0e2d3a12	136	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
d8c34b94	137	__aligned_largest;
0e2d3a12	138	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	139	int err;
	140
	141	err = shash->final(desc, buf);
8c32c516 HX	142	if (err)
	143	goto out;
	144
7b5a080b	145	memcpy(out, buf, ds);
8c32c516 HX	146
	147	out:
	148	memset(buf, 0, ds);
7b5a080b HX	149	return err;
	150	}
	151
	152	int crypto_shash_final(struct shash_desc desc, u8 out)
	153	{
	154	struct crypto_shash *tfm = desc->tfm;
	155	struct shash_alg *shash = crypto_shash_alg(tfm);
	156	unsigned long alignmask = crypto_shash_alignmask(tfm);
	157
	158	if ((unsigned long)out & alignmask)
	159	return shash_final_unaligned(desc, out);
	160
	161	return shash->final(desc, out);
	162	}
	163	EXPORT_SYMBOL_GPL(crypto_shash_final);
	164
	165	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	166	unsigned int len, u8 *out)
	167	{
	168	return crypto_shash_update(desc, data, len) ?:
	169	crypto_shash_final(desc, out);
	170	}
	171
	172	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	173	unsigned int len, u8 *out)
	174	{
	175	struct crypto_shash *tfm = desc->tfm;
	176	struct shash_alg *shash = crypto_shash_alg(tfm);
	177	unsigned long alignmask = crypto_shash_alignmask(tfm);
	178
8267adab	179	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	180	return shash_finup_unaligned(desc, data, len, out);
	181
	182	return shash->finup(desc, data, len, out);
	183	}
	184	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	185
	186	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	187	unsigned int len, u8 *out)
	188	{
	189	return crypto_shash_init(desc) ?:
f88ad8de	190	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	191	}
	192
	193	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	194	unsigned int len, u8 *out)
	195	{
	196	struct crypto_shash *tfm = desc->tfm;
	197	struct shash_alg *shash = crypto_shash_alg(tfm);
	198	unsigned long alignmask = crypto_shash_alignmask(tfm);
	199
65657355 EB	200	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	201	return -ENOKEY;
	202
8267adab	203	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	204	return shash_digest_unaligned(desc, data, len, out);
	205
	206	return shash->digest(desc, data, len, out);
	207	}
	208	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	209
f592682f	210	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	211	{
f592682f HX	212	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	213	return 0;
99d27e1c	214	}
dec8b786	215
f592682f	216	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	217	{
f592682f HX	218	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	219	return 0;
dec8b786	220	}
dec8b786	221
3b2f6df0 HX	222	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	223	unsigned int keylen)
	224	{
	225	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	226
	227	return crypto_shash_setkey(*ctx, key, keylen);
	228	}
	229
	230	static int shash_async_init(struct ahash_request *req)
	231	{
	232	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	233	struct shash_desc *desc = ahash_request_ctx(req);
	234
	235	desc->tfm = *ctx;
	236	desc->flags = req->base.flags;
	237
	238	return crypto_shash_init(desc);
	239	}
	240
7eddf95e	241	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	242	{
3b2f6df0 HX	243	struct crypto_hash_walk walk;
	244	int nbytes;
	245
	246	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	247	nbytes = crypto_hash_walk_done(&walk, nbytes))
	248	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	249
	250	return nbytes;
	251	}
7eddf95e HX	252	EXPORT_SYMBOL_GPL(shash_ahash_update);
	253
	254	static int shash_async_update(struct ahash_request *req)
	255	{
	256	return shash_ahash_update(req, ahash_request_ctx(req));
	257	}
3b2f6df0 HX	258
	259	static int shash_async_final(struct ahash_request *req)
	260	{
	261	return crypto_shash_final(ahash_request_ctx(req), req->result);
	262	}
	263
66f6ce5e HX	264	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	265	{
	266	struct crypto_hash_walk walk;
	267	int nbytes;
	268
cbc86b91 HX	269	nbytes = crypto_hash_walk_first(req, &walk);
	270	if (!nbytes)
	271	return crypto_shash_final(desc, req->result);
	272
	273	do {
66f6ce5e HX	274	nbytes = crypto_hash_walk_last(&walk) ?
	275	crypto_shash_finup(desc, walk.data, nbytes,
	276	req->result) :
	277	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	278	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	279	} while (nbytes > 0);
66f6ce5e HX	280
	281	return nbytes;
	282	}
	283	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	284
	285	static int shash_async_finup(struct ahash_request *req)
	286	{
	287	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	288	struct shash_desc *desc = ahash_request_ctx(req);
	289
	290	desc->tfm = *ctx;
	291	desc->flags = req->base.flags;
	292
	293	return shash_ahash_finup(req, desc);
	294	}
	295
7eddf95e	296	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0	297	{
3b2f6df0	298	unsigned int nbytes = req->nbytes;
b61907bb HX	299	struct scatterlist *sg;
b61907bb HX	300	unsigned int offset;
3b2f6df0 HX	301	int err;
3b2f6df0 HX	302
b61907bb HX	303	if (nbytes &&
	304	(sg = req->src, offset = sg->offset,
	305	nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
3b2f6df0 HX	306	void *data;
3b2f6df0 HX	307
f0dfc0b0	308	data = kmap_atomic(sg_page(sg));
3b2f6df0 HX	309	err = crypto_shash_digest(desc, data + offset, nbytes,
3b2f6df0 HX	310	req->result);
f0dfc0b0	311	kunmap_atomic(data);
3b2f6df0	312	crypto_yield(desc->flags);
7eddf95e HX	313	} else
7eddf95e HX	314	err = crypto_shash_init(desc) ?:
66f6ce5e	315	shash_ahash_finup(req, desc);
3b2f6df0	316
7eddf95e HX	317	return err;
	318	}
	319	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	320
7eddf95e HX	321	static int shash_async_digest(struct ahash_request *req)
	322	{
	323	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	324	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	325
7eddf95e HX	326	desc->tfm = *ctx;
7eddf95e HX	327	desc->flags = req->base.flags;
3b2f6df0	328
7eddf95e	329	return shash_ahash_digest(req, desc);
3b2f6df0 HX	330	}
3b2f6df0 HX	331
66f6ce5e HX	332	static int shash_async_export(struct ahash_request req, void out)
	333	{
	334	return crypto_shash_export(ahash_request_ctx(req), out);
	335	}
	336
	337	static int shash_async_import(struct ahash_request req, const void in)
	338	{
90246e79 HX	339	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	340	struct shash_desc *desc = ahash_request_ctx(req);
	341
	342	desc->tfm = *ctx;
	343	desc->flags = req->base.flags;
	344
	345	return crypto_shash_import(desc, in);
66f6ce5e HX	346	}
66f6ce5e HX	347
3b2f6df0 HX	348	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	349	{
	350	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	351
	352	crypto_free_shash(*ctx);
	353	}
	354
88056ec3	355	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	356	{
3b2f6df0 HX	357	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	358	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	359	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	360	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	361	struct crypto_shash *shash;
	362
	363	if (!crypto_mod_get(calg))
	364	return -EAGAIN;
	365
3f683d61	366	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	367	if (IS_ERR(shash)) {
	368	crypto_mod_put(calg);
	369	return PTR_ERR(shash);
	370	}
	371
	372	*ctx = shash;
	373	tfm->exit = crypto_exit_shash_ops_async;
	374
	375	crt->init = shash_async_init;
	376	crt->update = shash_async_update;
66f6ce5e HX	377	crt->final = shash_async_final;
66f6ce5e HX	378	crt->finup = shash_async_finup;
3b2f6df0	379	crt->digest = shash_async_digest;
ff4a35c5 EB	380	if (crypto_shash_alg_has_setkey(alg))
ff4a35c5 EB	381	crt->setkey = shash_async_setkey;
00420a65	382
65657355 EB	383	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
65657355 EB	384	CRYPTO_TFM_NEED_KEY);
66f6ce5e	385
66f6ce5e HX	386	if (alg->export)
66f6ce5e HX	387	crt->export = shash_async_export;
0044f3ed	388	if (alg->import)
66f6ce5e	389	crt->import = shash_async_import;
3b2f6df0	390
3b2f6df0 HX	391	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	392
	393	return 0;
	394	}
	395
2ca33da1	396	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	397	{
113adefc	398	struct crypto_shash *hash = __crypto_shash_cast(tfm);
65657355 EB	399	struct shash_alg *alg = crypto_shash_alg(hash);
	400
	401	hash->descsize = alg->descsize;
	402
ff4a35c5	403	shash_set_needkey(hash, alg);
113adefc	404
7b5a080b HX	405	return 0;
	406	}
	407
3acc8473	408	#ifdef CONFIG_NET
f4d663ce SK	409	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	410	{
	411	struct crypto_report_hash rhash;
	412	struct shash_alg *salg = __crypto_shash_alg(alg);
	413
9a5467bf MK	414	strncpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf MK	415
f4d663ce SK	416	rhash.blocksize = alg->cra_blocksize;
	417	rhash.digestsize = salg->digestsize;
	418
6662df33 DM	419	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
	420	sizeof(struct crypto_report_hash), &rhash))
	421	goto nla_put_failure;
f4d663ce SK	422	return 0;
	423
	424	nla_put_failure:
	425	return -EMSGSIZE;
	426	}
3acc8473 HX	427	#else
	428	static int crypto_shash_report(struct sk_buff skb, struct crypto_alg alg)
	429	{
	430	return -ENOSYS;
	431	}
	432	#endif
f4d663ce	433
7b5a080b	434	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	435	__maybe_unused;
7b5a080b HX	436	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	437	{
	438	struct shash_alg *salg = __crypto_shash_alg(alg);
	439
	440	seq_printf(m, "type : shash\n");
	441	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	442	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	443	}
	444
	445	static const struct crypto_type crypto_shash_type = {
ac611680	446	.extsize = crypto_alg_extsize,
7b5a080b HX	447	.init_tfm = crypto_shash_init_tfm,
	448	#ifdef CONFIG_PROC_FS
	449	.show = crypto_shash_show,
	450	#endif
f4d663ce	451	.report = crypto_shash_report,
7b5a080b HX	452	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	453	.maskset = CRYPTO_ALG_TYPE_MASK,
	454	.type = CRYPTO_ALG_TYPE_SHASH,
	455	.tfmsize = offsetof(struct crypto_shash, base),
	456	};
	457
	458	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	459	u32 mask)
	460	{
3f683d61	461	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	462	}
	463	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	464
619a6ebd	465	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	466	{
	467	struct crypto_alg *base = &alg->base;
	468
	469	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	470	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	471	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	472	return -EINVAL;
	473
	474	base->cra_type = &crypto_shash_type;
	475	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	476	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	477
8267adab HX	478	if (!alg->finup)
	479	alg->finup = shash_finup_unaligned;
	480	if (!alg->digest)
	481	alg->digest = shash_digest_unaligned;
f592682f HX	482	if (!alg->export) {
	483	alg->export = shash_default_export;
	484	alg->import = shash_default_import;
	485	alg->statesize = alg->descsize;
	486	}
57cfe44b HX	487	if (!alg->setkey)
57cfe44b HX	488	alg->setkey = shash_no_setkey;
99d27e1c	489
619a6ebd HX	490	return 0;
	491	}
	492
	493	int crypto_register_shash(struct shash_alg *alg)
	494	{
	495	struct crypto_alg *base = &alg->base;
	496	int err;
	497
	498	err = shash_prepare_alg(alg);
	499	if (err)
	500	return err;
7b5a080b HX	501
	502	return crypto_register_alg(base);
	503	}
	504	EXPORT_SYMBOL_GPL(crypto_register_shash);
	505
	506	int crypto_unregister_shash(struct shash_alg *alg)
	507	{
	508	return crypto_unregister_alg(&alg->base);
	509	}
	510	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	511
50fc3e8d JK	512	int crypto_register_shashes(struct shash_alg *algs, int count)
	513	{
	514	int i, ret;
	515
	516	for (i = 0; i < count; i++) {
	517	ret = crypto_register_shash(&algs[i]);
	518	if (ret)
	519	goto err;
	520	}
	521
	522	return 0;
	523
	524	err:
	525	for (--i; i >= 0; --i)
	526	crypto_unregister_shash(&algs[i]);
	527
	528	return ret;
	529	}
	530	EXPORT_SYMBOL_GPL(crypto_register_shashes);
	531
	532	int crypto_unregister_shashes(struct shash_alg *algs, int count)
	533	{
	534	int i, ret;
	535
	536	for (i = count - 1; i >= 0; --i) {
	537	ret = crypto_unregister_shash(&algs[i]);
	538	if (ret)
	539	pr_err("Failed to unregister %s %s: %d\n",
	540	algs[i].base.cra_driver_name,
	541	algs[i].base.cra_name, ret);
	542	}
	543
	544	return 0;
	545	}
	546	EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
	547
619a6ebd HX	548	int shash_register_instance(struct crypto_template *tmpl,
	549	struct shash_instance *inst)
	550	{
	551	int err;
	552
	553	err = shash_prepare_alg(&inst->alg);
	554	if (err)
	555	return err;
	556
	557	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	558	}
	559	EXPORT_SYMBOL_GPL(shash_register_instance);
	560
2e4fddd8 HX	561	void shash_free_instance(struct crypto_instance *inst)
	562	{
	563	crypto_drop_spawn(crypto_instance_ctx(inst));
	564	kfree(shash_instance(inst));
	565	}
	566	EXPORT_SYMBOL_GPL(shash_free_instance);
	567
94296999 HX	568	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	569	struct shash_alg *alg,
	570	struct crypto_instance *inst)
	571	{
	572	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	573	&crypto_shash_type);
	574	}
	575	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	576
7d6f5640 HX	577	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	578	{
	579	struct crypto_alg *alg;
	580
	581	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	582	return IS_ERR(alg) ? ERR_CAST(alg) :
	583	container_of(alg, struct shash_alg, base);
	584	}
	585	EXPORT_SYMBOL_GPL(shash_attr_alg);
	586
7b5a080b HX	587	MODULE_LICENSE("GPL");
7b5a080b HX	588	MODULE_DESCRIPTION("Synchronous cryptographic hash type");