[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 "internal.h"

static const struct crypto_type crypto_shash_type;

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

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_MINALIGN - 1));
	buffer = kmalloc(absize, GFP_KERNEL);
	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);

	if ((unsigned long)key & alignmask)
		return shash_setkey_unaligned(tfm, key, keylen);

	return shash->setkey(tfm, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_shash_setkey);

static inline unsigned int shash_align_buffer_size(unsigned len,
						   unsigned long mask)
{
	return len + (mask & ~(__alignof__(u8 __attribute__ ((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 buf[shash_align_buffer_size(unaligned_len, alignmask)]
		__attribute__ ((aligned));
	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 buf[shash_align_buffer_size(ds, alignmask)]
		__attribute__ ((aligned));
	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 (((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_no_export(struct shash_desc *desc, void *out)
{
	return -ENOSYS;
}

static int shash_no_import(struct shash_desc *desc, const void *in)
{
	return -ENOSYS;
}

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_digest(struct ahash_request *req, struct shash_desc *desc)
{
	struct scatterlist *sg = req->src;
	unsigned int offset = sg->offset;
	unsigned int nbytes = req->nbytes;
	int err;

	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
		void *data;

		data = crypto_kmap(sg_page(sg), 0);
		err = crypto_shash_digest(desc, data + offset, nbytes,
					  req->result);
		crypto_kunmap(data, 0);
		crypto_yield(desc->flags);
	} else
		err = crypto_shash_init(desc) ?:
		      shash_ahash_update(req, desc) ?:
		      crypto_shash_final(desc, req->result);

	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 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 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->digest = shash_async_digest;
	crt->setkey = shash_async_setkey;

	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);

	return 0;
}

static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
			       unsigned int keylen)
{
	struct shash_desc **descp = crypto_hash_ctx(tfm);
	struct shash_desc *desc = *descp;

	return crypto_shash_setkey(desc->tfm, key, keylen);
}

static int shash_compat_init(struct hash_desc *hdesc)
{
	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	struct shash_desc *desc = *descp;

	desc->flags = hdesc->flags;

	return crypto_shash_init(desc);
}

static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
			       unsigned int len)
{
	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	struct shash_desc *desc = *descp;
	struct crypto_hash_walk walk;
	int nbytes;

	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	     nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
		nbytes = crypto_shash_update(desc, walk.data, nbytes);

	return nbytes;
}

static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
{
	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);

	return crypto_shash_final(*descp, out);
}

static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
			       unsigned int nbytes, u8 *out)
{
	unsigned int offset = sg->offset;
	int err;

	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
		struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
		struct shash_desc *desc = *descp;
		void *data;

		desc->flags = hdesc->flags;

		data = crypto_kmap(sg_page(sg), 0);
		err = crypto_shash_digest(desc, data + offset, nbytes, out);
		crypto_kunmap(data, 0);
		crypto_yield(desc->flags);
		goto out;
	}

	err = shash_compat_init(hdesc);
	if (err)
		goto out;

	err = shash_compat_update(hdesc, sg, nbytes);
	if (err)
		goto out;

	err = shash_compat_final(hdesc, out);

out:
	return err;
}

static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
{
	struct shash_desc **descp = crypto_tfm_ctx(tfm);
	struct shash_desc *desc = *descp;

	crypto_free_shash(desc->tfm);
	kzfree(desc);
}

static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
{
	struct hash_tfm *crt = &tfm->crt_hash;
	struct crypto_alg *calg = tfm->__crt_alg;
	struct shash_alg *alg = __crypto_shash_alg(calg);
	struct shash_desc **descp = crypto_tfm_ctx(tfm);
	struct crypto_shash *shash;
	struct shash_desc *desc;

	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);
	}

	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
		       GFP_KERNEL);
	if (!desc) {
		crypto_free_shash(shash);
		return -ENOMEM;
	}

	*descp = desc;
	desc->tfm = shash;
	tfm->exit = crypto_exit_shash_ops_compat;

	crt->init = shash_compat_init;
	crt->update = shash_compat_update;
	crt->final  = shash_compat_final;
	crt->digest = shash_compat_digest;
	crt->setkey = shash_compat_setkey;

	crt->digestsize = alg->digestsize;

	return 0;
}

static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	switch (mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_HASH_MASK:
		return crypto_init_shash_ops_compat(tfm);
	}

	return -EINVAL;
}

static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
					 u32 mask)
{
	switch (mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_HASH_MASK:
		return sizeof(struct shash_desc *);
	}

	return 0;
}

static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_shash *hash = __crypto_shash_cast(tfm);

	hash->descsize = crypto_shash_alg(hash)->descsize;
	return 0;
}

static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
{
	return alg->cra_ctxsize;
}

static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((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 = {
	.ctxsize = crypto_shash_ctxsize,
	.extsize = crypto_shash_extsize,
	.init = crypto_init_shash_ops,
	.init_tfm = crypto_shash_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_shash_show,
#endif
	.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->import)
		alg->import = shash_no_import;
	if (!alg->export)
		alg->export = shash_no_export;
	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 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>
	20
3b2f6df0 HX	21	#include "internal.h"
3b2f6df0 HX	22
3f683d61 HX	23	static const struct crypto_type crypto_shash_type;
3f683d61 HX	24
57cfe44b HX	25	static int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	26	unsigned int keylen)
	27	{
	28	return -ENOSYS;
	29	}
	30
7b5a080b HX	31	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	32	unsigned int keylen)
	33	{
	34	struct shash_alg *shash = crypto_shash_alg(tfm);
	35	unsigned long alignmask = crypto_shash_alignmask(tfm);
	36	unsigned long absize;
	37	u8 buffer, alignbuffer;
	38	int err;
	39
	40	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	41	buffer = kmalloc(absize, GFP_KERNEL);
	42	if (!buffer)
	43	return -ENOMEM;
	44
	45	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	46	memcpy(alignbuffer, key, keylen);
	47	err = shash->setkey(tfm, alignbuffer, keylen);
8c32c516	48	kzfree(buffer);
7b5a080b HX	49	return err;
	50	}
	51
	52	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	53	unsigned int keylen)
	54	{
	55	struct shash_alg *shash = crypto_shash_alg(tfm);
	56	unsigned long alignmask = crypto_shash_alignmask(tfm);
	57
	58	if ((unsigned long)key & alignmask)
	59	return shash_setkey_unaligned(tfm, key, keylen);
	60
	61	return shash->setkey(tfm, key, keylen);
	62	}
	63	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	64
	65	static inline unsigned int shash_align_buffer_size(unsigned len,
	66	unsigned long mask)
	67	{
	68	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	69	}
	70
	71	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	72	unsigned int len)
	73	{
	74	struct crypto_shash *tfm = desc->tfm;
	75	struct shash_alg *shash = crypto_shash_alg(tfm);
	76	unsigned long alignmask = crypto_shash_alignmask(tfm);
	77	unsigned int unaligned_len = alignmask + 1 -
	78	((unsigned long)data & alignmask);
	79	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
	80	__attribute__ ((aligned));
8c32c516	81	int err;
7b5a080b	82
f4f68993 YS	83	if (unaligned_len > len)
	84	unaligned_len = len;
	85
7b5a080b	86	memcpy(buf, data, unaligned_len);
8c32c516 HX	87	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	88	memset(buf, 0, unaligned_len);
7b5a080b	89
8c32c516	90	return err ?:
7b5a080b HX	91	shash->update(desc, data + unaligned_len, len - unaligned_len);
	92	}
	93
	94	int crypto_shash_update(struct shash_desc desc, const u8 data,
	95	unsigned int len)
	96	{
	97	struct crypto_shash *tfm = desc->tfm;
	98	struct shash_alg *shash = crypto_shash_alg(tfm);
	99	unsigned long alignmask = crypto_shash_alignmask(tfm);
	100
	101	if ((unsigned long)data & alignmask)
	102	return shash_update_unaligned(desc, data, len);
	103
	104	return shash->update(desc, data, len);
	105	}
	106	EXPORT_SYMBOL_GPL(crypto_shash_update);
	107
	108	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	109	{
	110	struct crypto_shash *tfm = desc->tfm;
	111	unsigned long alignmask = crypto_shash_alignmask(tfm);
	112	struct shash_alg *shash = crypto_shash_alg(tfm);
	113	unsigned int ds = crypto_shash_digestsize(tfm);
	114	u8 buf[shash_align_buffer_size(ds, alignmask)]
	115	__attribute__ ((aligned));
	116	int err;
	117
	118	err = shash->final(desc, buf);
8c32c516 HX	119	if (err)
	120	goto out;
	121
7b5a080b	122	memcpy(out, buf, ds);
8c32c516 HX	123
	124	out:
	125	memset(buf, 0, ds);
7b5a080b HX	126	return err;
	127	}
	128
	129	int crypto_shash_final(struct shash_desc desc, u8 out)
	130	{
	131	struct crypto_shash *tfm = desc->tfm;
	132	struct shash_alg *shash = crypto_shash_alg(tfm);
	133	unsigned long alignmask = crypto_shash_alignmask(tfm);
	134
	135	if ((unsigned long)out & alignmask)
	136	return shash_final_unaligned(desc, out);
	137
	138	return shash->final(desc, out);
	139	}
	140	EXPORT_SYMBOL_GPL(crypto_shash_final);
	141
	142	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	143	unsigned int len, u8 *out)
	144	{
	145	return crypto_shash_update(desc, data, len) ?:
	146	crypto_shash_final(desc, out);
	147	}
	148
	149	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	150	unsigned int len, u8 *out)
	151	{
	152	struct crypto_shash *tfm = desc->tfm;
	153	struct shash_alg *shash = crypto_shash_alg(tfm);
	154	unsigned long alignmask = crypto_shash_alignmask(tfm);
	155
8267adab	156	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	157	return shash_finup_unaligned(desc, data, len, out);
	158
	159	return shash->finup(desc, data, len, out);
	160	}
	161	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	162
	163	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	164	unsigned int len, u8 *out)
	165	{
	166	return crypto_shash_init(desc) ?:
f88ad8de	167	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	168	}
	169
	170	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	171	unsigned int len, u8 *out)
	172	{
	173	struct crypto_shash *tfm = desc->tfm;
	174	struct shash_alg *shash = crypto_shash_alg(tfm);
	175	unsigned long alignmask = crypto_shash_alignmask(tfm);
	176
8267adab	177	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	178	return shash_digest_unaligned(desc, data, len, out);
	179
	180	return shash->digest(desc, data, len, out);
	181	}
	182	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	183
99d27e1c	184	static int shash_no_export(struct shash_desc desc, void out)
dec8b786	185	{
99d27e1c HX	186	return -ENOSYS;
99d27e1c HX	187	}
dec8b786	188
99d27e1c HX	189	static int shash_no_import(struct shash_desc desc, const void in)
	190	{
	191	return -ENOSYS;
dec8b786	192	}
dec8b786	193
3b2f6df0 HX	194	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	195	unsigned int keylen)
	196	{
	197	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	198
	199	return crypto_shash_setkey(*ctx, key, keylen);
	200	}
	201
	202	static int shash_async_init(struct ahash_request *req)
	203	{
	204	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	205	struct shash_desc *desc = ahash_request_ctx(req);
	206
	207	desc->tfm = *ctx;
	208	desc->flags = req->base.flags;
	209
	210	return crypto_shash_init(desc);
	211	}
	212
7eddf95e	213	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	214	{
3b2f6df0 HX	215	struct crypto_hash_walk walk;
	216	int nbytes;
	217
	218	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	219	nbytes = crypto_hash_walk_done(&walk, nbytes))
	220	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	221
	222	return nbytes;
	223	}
7eddf95e HX	224	EXPORT_SYMBOL_GPL(shash_ahash_update);
	225
	226	static int shash_async_update(struct ahash_request *req)
	227	{
	228	return shash_ahash_update(req, ahash_request_ctx(req));
	229	}
3b2f6df0 HX	230
	231	static int shash_async_final(struct ahash_request *req)
	232	{
	233	return crypto_shash_final(ahash_request_ctx(req), req->result);
	234	}
	235
7eddf95e	236	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0 HX	237	{
	238	struct scatterlist *sg = req->src;
	239	unsigned int offset = sg->offset;
	240	unsigned int nbytes = req->nbytes;
	241	int err;
	242
	243	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
3b2f6df0 HX	244	void *data;
3b2f6df0 HX	245
3b2f6df0 HX	246	data = crypto_kmap(sg_page(sg), 0);
	247	err = crypto_shash_digest(desc, data + offset, nbytes,
	248	req->result);
	249	crypto_kunmap(data, 0);
	250	crypto_yield(desc->flags);
7eddf95e HX	251	} else
	252	err = crypto_shash_init(desc) ?:
	253	shash_ahash_update(req, desc) ?:
	254	crypto_shash_final(desc, req->result);
3b2f6df0	255
7eddf95e HX	256	return err;
	257	}
	258	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	259
7eddf95e HX	260	static int shash_async_digest(struct ahash_request *req)
	261	{
	262	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	263	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	264
7eddf95e HX	265	desc->tfm = *ctx;
7eddf95e HX	266	desc->flags = req->base.flags;
3b2f6df0	267
7eddf95e	268	return shash_ahash_digest(req, desc);
3b2f6df0 HX	269	}
	270
	271	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	272	{
	273	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	274
	275	crypto_free_shash(*ctx);
	276	}
	277
88056ec3	278	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	279	{
3b2f6df0 HX	280	struct crypto_alg *calg = tfm->__crt_alg;
88056ec3	281	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	282	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	283	struct crypto_shash *shash;
	284
	285	if (!crypto_mod_get(calg))
	286	return -EAGAIN;
	287
3f683d61	288	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	289	if (IS_ERR(shash)) {
	290	crypto_mod_put(calg);
	291	return PTR_ERR(shash);
	292	}
	293
	294	*ctx = shash;
	295	tfm->exit = crypto_exit_shash_ops_async;
	296
	297	crt->init = shash_async_init;
	298	crt->update = shash_async_update;
	299	crt->final = shash_async_final;
	300	crt->digest = shash_async_digest;
	301	crt->setkey = shash_async_setkey;
	302
3b2f6df0 HX	303	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	304
	305	return 0;
	306	}
	307
5f7082ed HX	308	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	309	unsigned int keylen)
	310	{
113adefc HX	311	struct shash_desc **descp = crypto_hash_ctx(tfm);
113adefc HX	312	struct shash_desc desc = descp;
5f7082ed HX	313
	314	return crypto_shash_setkey(desc->tfm, key, keylen);
	315	}
	316
	317	static int shash_compat_init(struct hash_desc *hdesc)
	318	{
113adefc HX	319	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	320	struct shash_desc desc = descp;
5f7082ed HX	321
	322	desc->flags = hdesc->flags;
	323
	324	return crypto_shash_init(desc);
	325	}
	326
	327	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	328	unsigned int len)
	329	{
113adefc HX	330	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	331	struct shash_desc desc = descp;
5f7082ed HX	332	struct crypto_hash_walk walk;
	333	int nbytes;
	334
	335	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	336	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	337	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	338
	339	return nbytes;
	340	}
	341
	342	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	343	{
113adefc HX	344	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	345
	346	return crypto_shash_final(*descp, out);
5f7082ed HX	347	}
	348
	349	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	350	unsigned int nbytes, u8 *out)
	351	{
	352	unsigned int offset = sg->offset;
	353	int err;
	354
	355	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
113adefc HX	356	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	357	struct shash_desc desc = descp;
5f7082ed HX	358	void *data;
	359
	360	desc->flags = hdesc->flags;
	361
	362	data = crypto_kmap(sg_page(sg), 0);
	363	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	364	crypto_kunmap(data, 0);
	365	crypto_yield(desc->flags);
	366	goto out;
	367	}
	368
	369	err = shash_compat_init(hdesc);
	370	if (err)
	371	goto out;
	372
	373	err = shash_compat_update(hdesc, sg, nbytes);
	374	if (err)
	375	goto out;
	376
	377	err = shash_compat_final(hdesc, out);
	378
	379	out:
	380	return err;
	381	}
	382
	383	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
	384	{
113adefc HX	385	struct shash_desc **descp = crypto_tfm_ctx(tfm);
113adefc HX	386	struct shash_desc desc = descp;
5f7082ed HX	387
5f7082ed HX	388	crypto_free_shash(desc->tfm);
113adefc	389	kzfree(desc);
5f7082ed HX	390	}
	391
	392	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
	393	{
	394	struct hash_tfm *crt = &tfm->crt_hash;
	395	struct crypto_alg *calg = tfm->__crt_alg;
	396	struct shash_alg *alg = __crypto_shash_alg(calg);
113adefc	397	struct shash_desc **descp = crypto_tfm_ctx(tfm);
5f7082ed	398	struct crypto_shash *shash;
113adefc	399	struct shash_desc *desc;
5f7082ed	400
4abfd73e AKR	401	if (!crypto_mod_get(calg))
	402	return -EAGAIN;
	403
3f683d61	404	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	405	if (IS_ERR(shash)) {
4abfd73e AKR	406	crypto_mod_put(calg);
5f7082ed	407	return PTR_ERR(shash);
4abfd73e	408	}
5f7082ed	409
113adefc HX	410	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
	411	GFP_KERNEL);
	412	if (!desc) {
	413	crypto_free_shash(shash);
	414	return -ENOMEM;
	415	}
	416
	417	*descp = desc;
5f7082ed HX	418	desc->tfm = shash;
	419	tfm->exit = crypto_exit_shash_ops_compat;
	420
	421	crt->init = shash_compat_init;
	422	crt->update = shash_compat_update;
	423	crt->final = shash_compat_final;
	424	crt->digest = shash_compat_digest;
	425	crt->setkey = shash_compat_setkey;
	426
	427	crt->digestsize = alg->digestsize;
	428
	429	return 0;
	430	}
	431
3b2f6df0 HX	432	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	433	{
	434	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	435	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	436	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	437	}
	438
	439	return -EINVAL;
	440	}
	441
	442	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	443	u32 mask)
	444	{
	445	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed	446	case CRYPTO_ALG_TYPE_HASH_MASK:
113adefc	447	return sizeof(struct shash_desc *);
3b2f6df0 HX	448	}
	449
	450	return 0;
	451	}
	452
2ca33da1	453	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	454	{
113adefc HX	455	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	456
	457	hash->descsize = crypto_shash_alg(hash)->descsize;
7b5a080b HX	458	return 0;
	459	}
	460
2ca33da1	461	static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
7b5a080b HX	462	{
	463	return alg->cra_ctxsize;
	464	}
	465
	466	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	467	__attribute__ ((unused));
	468	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	469	{
	470	struct shash_alg *salg = __crypto_shash_alg(alg);
	471
	472	seq_printf(m, "type : shash\n");
	473	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	474	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	475	}
	476
	477	static const struct crypto_type crypto_shash_type = {
3b2f6df0	478	.ctxsize = crypto_shash_ctxsize,
7b5a080b	479	.extsize = crypto_shash_extsize,
3b2f6df0	480	.init = crypto_init_shash_ops,
7b5a080b HX	481	.init_tfm = crypto_shash_init_tfm,
	482	#ifdef CONFIG_PROC_FS
	483	.show = crypto_shash_show,
	484	#endif
	485	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	486	.maskset = CRYPTO_ALG_TYPE_MASK,
	487	.type = CRYPTO_ALG_TYPE_SHASH,
	488	.tfmsize = offsetof(struct crypto_shash, base),
	489	};
	490
	491	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	492	u32 mask)
	493	{
3f683d61	494	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	495	}
	496	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	497
619a6ebd	498	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	499	{
	500	struct crypto_alg *base = &alg->base;
	501
	502	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	503	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	504	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	505	return -EINVAL;
	506
	507	base->cra_type = &crypto_shash_type;
	508	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	509	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	510
8267adab HX	511	if (!alg->finup)
	512	alg->finup = shash_finup_unaligned;
	513	if (!alg->digest)
	514	alg->digest = shash_digest_unaligned;
99d27e1c HX	515	if (!alg->import)
	516	alg->import = shash_no_import;
	517	if (!alg->export)
	518	alg->export = shash_no_export;
57cfe44b HX	519	if (!alg->setkey)
57cfe44b HX	520	alg->setkey = shash_no_setkey;
99d27e1c	521
619a6ebd HX	522	return 0;
	523	}
	524
	525	int crypto_register_shash(struct shash_alg *alg)
	526	{
	527	struct crypto_alg *base = &alg->base;
	528	int err;
	529
	530	err = shash_prepare_alg(alg);
	531	if (err)
	532	return err;
7b5a080b HX	533
	534	return crypto_register_alg(base);
	535	}
	536	EXPORT_SYMBOL_GPL(crypto_register_shash);
	537
	538	int crypto_unregister_shash(struct shash_alg *alg)
	539	{
	540	return crypto_unregister_alg(&alg->base);
	541	}
	542	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	543
619a6ebd HX	544	int shash_register_instance(struct crypto_template *tmpl,
	545	struct shash_instance *inst)
	546	{
	547	int err;
	548
	549	err = shash_prepare_alg(&inst->alg);
	550	if (err)
	551	return err;
	552
	553	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	554	}
	555	EXPORT_SYMBOL_GPL(shash_register_instance);
	556
2e4fddd8 HX	557	void shash_free_instance(struct crypto_instance *inst)
	558	{
	559	crypto_drop_spawn(crypto_instance_ctx(inst));
	560	kfree(shash_instance(inst));
	561	}
	562	EXPORT_SYMBOL_GPL(shash_free_instance);
	563
94296999 HX	564	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	565	struct shash_alg *alg,
	566	struct crypto_instance *inst)
	567	{
	568	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	569	&crypto_shash_type);
	570	}
	571	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	572
7d6f5640 HX	573	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	574	{
	575	struct crypto_alg *alg;
	576
	577	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	578	return IS_ERR(alg) ? ERR_CAST(alg) :
	579	container_of(alg, struct shash_alg, base);
	580	}
	581	EXPORT_SYMBOL_GPL(shash_attr_alg);
	582
7b5a080b HX	583	MODULE_LICENSE("GPL");
7b5a080b HX	584	MODULE_DESCRIPTION("Synchronous cryptographic hash type");