[mirror_ubuntu-zesty-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_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);
	memset(alignbuffer, 0, keylen);
	kfree(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 (!shash->setkey)
		return -ENOSYS;

	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));

	if (unaligned_len > len)
		unaligned_len = len;

	memcpy(buf, data, unaligned_len);

	return shash->update(desc, buf, unaligned_len) ?:
	       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);
	memcpy(out, buf, 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 ||
	    !shash->finup)
		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 ||
	    !shash->digest)
		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);
}

static int shash_async_update(struct ahash_request *req)
{
	struct shash_desc *desc = ahash_request_ctx(req);
	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;
}

static int shash_async_final(struct ahash_request *req)
{
	return crypto_shash_final(ahash_request_ctx(req), req->result);
}

static int shash_async_digest(struct ahash_request *req)
{
	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)) {
		struct crypto_shash **ctx =
			crypto_ahash_ctx(crypto_ahash_reqtfm(req));
		struct shash_desc *desc = ahash_request_ctx(req);
		void *data;

		desc->tfm = *ctx;
		desc->flags = req->base.flags;

		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);
		goto out;
	}

	err = shash_async_init(req);
	if (err)
		goto out;

	err = shash_async_update(req);
	if (err)
		goto out;

	err = shash_async_final(req);

out:
	return err;
}

static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);

	crypto_free_shash(*ctx);
}

static 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 ahash_tfm *crt = &tfm->crt_ahash;
	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->digestsize = alg->digestsize;
	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 *desc = crypto_hash_ctx(tfm);

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

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

	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 *desc = crypto_hash_ctx(hdesc->tfm);
	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)
{
	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), 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 *desc = crypto_hash_ctx(hdesc->tfm);
		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 *desc= crypto_tfm_ctx(tfm);

	crypto_free_shash(desc->tfm);
}

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 *desc = 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);
	}

	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);
	case CRYPTO_ALG_TYPE_AHASH_MASK:
		return crypto_init_shash_ops_async(tfm);
	}

	return -EINVAL;
}

static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
					 u32 mask)
{
	struct shash_alg *salg = __crypto_shash_alg(alg);

	switch (mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_HASH_MASK:
		return sizeof(struct shash_desc) + salg->descsize;
	case CRYPTO_ALG_TYPE_AHASH_MASK:
		return sizeof(struct crypto_shash *);
	}

	return 0;
}

static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
				 const struct crypto_type *frontend)
{
	return 0;
}

static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
					 const struct crypto_type *frontend)
{
	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);
	seq_printf(m, "descsize     : %u\n", salg->descsize);
}

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->import)
		alg->import = shash_no_import;
	if (!alg->export)
		alg->export = shash_no_export;

	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
7b5a080b HX	25	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	26	unsigned int keylen)
	27	{
	28	struct shash_alg *shash = crypto_shash_alg(tfm);
	29	unsigned long alignmask = crypto_shash_alignmask(tfm);
	30	unsigned long absize;
	31	u8 buffer, alignbuffer;
	32	int err;
	33
	34	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	35	buffer = kmalloc(absize, GFP_KERNEL);
	36	if (!buffer)
	37	return -ENOMEM;
	38
	39	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	40	memcpy(alignbuffer, key, keylen);
	41	err = shash->setkey(tfm, alignbuffer, keylen);
	42	memset(alignbuffer, 0, keylen);
	43	kfree(buffer);
	44	return err;
	45	}
	46
	47	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	48	unsigned int keylen)
	49	{
	50	struct shash_alg *shash = crypto_shash_alg(tfm);
	51	unsigned long alignmask = crypto_shash_alignmask(tfm);
	52
3751f402 HX	53	if (!shash->setkey)
	54	return -ENOSYS;
	55
7b5a080b HX	56	if ((unsigned long)key & alignmask)
	57	return shash_setkey_unaligned(tfm, key, keylen);
	58
	59	return shash->setkey(tfm, key, keylen);
	60	}
	61	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	62
	63	static inline unsigned int shash_align_buffer_size(unsigned len,
	64	unsigned long mask)
	65	{
	66	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	67	}
	68
	69	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	70	unsigned int len)
	71	{
	72	struct crypto_shash *tfm = desc->tfm;
	73	struct shash_alg *shash = crypto_shash_alg(tfm);
	74	unsigned long alignmask = crypto_shash_alignmask(tfm);
	75	unsigned int unaligned_len = alignmask + 1 -
	76	((unsigned long)data & alignmask);
	77	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
	78	__attribute__ ((aligned));
	79
f4f68993 YS	80	if (unaligned_len > len)
	81	unaligned_len = len;
	82
7b5a080b HX	83	memcpy(buf, data, unaligned_len);
	84
	85	return shash->update(desc, buf, unaligned_len) ?:
	86	shash->update(desc, data + unaligned_len, len - unaligned_len);
	87	}
	88
	89	int crypto_shash_update(struct shash_desc desc, const u8 data,
	90	unsigned int len)
	91	{
	92	struct crypto_shash *tfm = desc->tfm;
	93	struct shash_alg *shash = crypto_shash_alg(tfm);
	94	unsigned long alignmask = crypto_shash_alignmask(tfm);
	95
	96	if ((unsigned long)data & alignmask)
	97	return shash_update_unaligned(desc, data, len);
	98
	99	return shash->update(desc, data, len);
	100	}
	101	EXPORT_SYMBOL_GPL(crypto_shash_update);
	102
	103	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	104	{
	105	struct crypto_shash *tfm = desc->tfm;
	106	unsigned long alignmask = crypto_shash_alignmask(tfm);
	107	struct shash_alg *shash = crypto_shash_alg(tfm);
	108	unsigned int ds = crypto_shash_digestsize(tfm);
	109	u8 buf[shash_align_buffer_size(ds, alignmask)]
	110	__attribute__ ((aligned));
	111	int err;
	112
	113	err = shash->final(desc, buf);
	114	memcpy(out, buf, ds);
	115	return err;
	116	}
	117
	118	int crypto_shash_final(struct shash_desc desc, u8 out)
	119	{
	120	struct crypto_shash *tfm = desc->tfm;
	121	struct shash_alg *shash = crypto_shash_alg(tfm);
	122	unsigned long alignmask = crypto_shash_alignmask(tfm);
	123
	124	if ((unsigned long)out & alignmask)
	125	return shash_final_unaligned(desc, out);
	126
	127	return shash->final(desc, out);
	128	}
	129	EXPORT_SYMBOL_GPL(crypto_shash_final);
	130
	131	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	132	unsigned int len, u8 *out)
	133	{
	134	return crypto_shash_update(desc, data, len) ?:
	135	crypto_shash_final(desc, out);
	136	}
	137
	138	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	139	unsigned int len, u8 *out)
	140	{
	141	struct crypto_shash *tfm = desc->tfm;
	142	struct shash_alg *shash = crypto_shash_alg(tfm);
	143	unsigned long alignmask = crypto_shash_alignmask(tfm);
	144
	145	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
	146	!shash->finup)
147	return shash_finup_unaligned(desc, data, len, out);
148
149	return shash->finup(desc, data, len, out);
150	}
151	EXPORT_SYMBOL_GPL(crypto_shash_finup);
152
153	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
154	unsigned int len, u8 *out)
155	{
156	return crypto_shash_init(desc) ?:
f88ad8de	157	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	158	}
	159
	160	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	161	unsigned int len, u8 *out)
	162	{
	163	struct crypto_shash *tfm = desc->tfm;
	164	struct shash_alg *shash = crypto_shash_alg(tfm);
	165	unsigned long alignmask = crypto_shash_alignmask(tfm);
	166
	167	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
	168	!shash->digest)
	169	return shash_digest_unaligned(desc, data, len, out);
	170
	171	return shash->digest(desc, data, len, out);
	172	}
	173	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	174
99d27e1c	175	static int shash_no_export(struct shash_desc desc, void out)
dec8b786	176	{
99d27e1c HX	177	return -ENOSYS;
99d27e1c HX	178	}
dec8b786	179
99d27e1c HX	180	static int shash_no_import(struct shash_desc desc, const void in)
	181	{
	182	return -ENOSYS;
dec8b786	183	}
dec8b786	184
3b2f6df0 HX	185	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	186	unsigned int keylen)
	187	{
	188	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	189
	190	return crypto_shash_setkey(*ctx, key, keylen);
	191	}
	192
	193	static int shash_async_init(struct ahash_request *req)
	194	{
	195	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	196	struct shash_desc *desc = ahash_request_ctx(req);
	197
	198	desc->tfm = *ctx;
	199	desc->flags = req->base.flags;
	200
	201	return crypto_shash_init(desc);
	202	}
	203
	204	static int shash_async_update(struct ahash_request *req)
	205	{
	206	struct shash_desc *desc = ahash_request_ctx(req);
	207	struct crypto_hash_walk walk;
	208	int nbytes;
	209
	210	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	211	nbytes = crypto_hash_walk_done(&walk, nbytes))
	212	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	213
	214	return nbytes;
	215	}
	216
	217	static int shash_async_final(struct ahash_request *req)
	218	{
	219	return crypto_shash_final(ahash_request_ctx(req), req->result);
	220	}
	221
	222	static int shash_async_digest(struct ahash_request *req)
	223	{
	224	struct scatterlist *sg = req->src;
	225	unsigned int offset = sg->offset;
	226	unsigned int nbytes = req->nbytes;
	227	int err;
	228
	229	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	230	struct crypto_shash **ctx =
	231	crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	232	struct shash_desc *desc = ahash_request_ctx(req);
	233	void *data;
	234
	235	desc->tfm = *ctx;
	236	desc->flags = req->base.flags;
	237
	238	data = crypto_kmap(sg_page(sg), 0);
	239	err = crypto_shash_digest(desc, data + offset, nbytes,
	240	req->result);
	241	crypto_kunmap(data, 0);
	242	crypto_yield(desc->flags);
	243	goto out;
	244	}
	245
	246	err = shash_async_init(req);
	247	if (err)
	248	goto out;
249
250	err = shash_async_update(req);
251	if (err)
252	goto out;
253
254	err = shash_async_final(req);
255
256	out:
257	return err;
258	}
259
260	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
261	{
262	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
263
264	crypto_free_shash(*ctx);
265	}
266
267	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
268	{
269	struct crypto_alg *calg = tfm->__crt_alg;
270	struct shash_alg *alg = __crypto_shash_alg(calg);
271	struct ahash_tfm *crt = &tfm->crt_ahash;
272	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
273	struct crypto_shash *shash;
274
275	if (!crypto_mod_get(calg))
276	return -EAGAIN;
277
3f683d61	278	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	279	if (IS_ERR(shash)) {
	280	crypto_mod_put(calg);
	281	return PTR_ERR(shash);
	282	}
	283
	284	*ctx = shash;
	285	tfm->exit = crypto_exit_shash_ops_async;
	286
	287	crt->init = shash_async_init;
	288	crt->update = shash_async_update;
	289	crt->final = shash_async_final;
	290	crt->digest = shash_async_digest;
	291	crt->setkey = shash_async_setkey;
	292
	293	crt->digestsize = alg->digestsize;
	294	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	295
	296	return 0;
	297	}
	298
5f7082ed HX	299	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	300	unsigned int keylen)
	301	{
	302	struct shash_desc *desc = crypto_hash_ctx(tfm);
	303
	304	return crypto_shash_setkey(desc->tfm, key, keylen);
	305	}
	306
	307	static int shash_compat_init(struct hash_desc *hdesc)
	308	{
	309	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	310
	311	desc->flags = hdesc->flags;
	312
	313	return crypto_shash_init(desc);
	314	}
	315
	316	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	317	unsigned int len)
	318	{
	319	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	320	struct crypto_hash_walk walk;
	321	int nbytes;
	322
	323	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	324	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	325	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	326
	327	return nbytes;
	328	}
	329
	330	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	331	{
	332	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
	333	}
	334
	335	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	336	unsigned int nbytes, u8 *out)
	337	{
	338	unsigned int offset = sg->offset;
	339	int err;
	340
	341	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	342	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	343	void *data;
	344
	345	desc->flags = hdesc->flags;
	346
	347	data = crypto_kmap(sg_page(sg), 0);
	348	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	349	crypto_kunmap(data, 0);
	350	crypto_yield(desc->flags);
	351	goto out;
	352	}
	353
	354	err = shash_compat_init(hdesc);
	355	if (err)
	356	goto out;
	357
	358	err = shash_compat_update(hdesc, sg, nbytes);
	359	if (err)
	360	goto out;
	361
	362	err = shash_compat_final(hdesc, out);
363
364	out:
365	return err;
366	}
367
368	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
369	{
370	struct shash_desc *desc= crypto_tfm_ctx(tfm);
371
372	crypto_free_shash(desc->tfm);
373	}
374
375	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
376	{
377	struct hash_tfm *crt = &tfm->crt_hash;
378	struct crypto_alg *calg = tfm->__crt_alg;
379	struct shash_alg *alg = __crypto_shash_alg(calg);
380	struct shash_desc *desc = crypto_tfm_ctx(tfm);
381	struct crypto_shash *shash;
382
4abfd73e AKR	383	if (!crypto_mod_get(calg))
	384	return -EAGAIN;
	385
3f683d61	386	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	387	if (IS_ERR(shash)) {
4abfd73e AKR	388	crypto_mod_put(calg);
5f7082ed	389	return PTR_ERR(shash);
4abfd73e	390	}
5f7082ed HX	391
	392	desc->tfm = shash;
	393	tfm->exit = crypto_exit_shash_ops_compat;
	394
	395	crt->init = shash_compat_init;
	396	crt->update = shash_compat_update;
	397	crt->final = shash_compat_final;
	398	crt->digest = shash_compat_digest;
	399	crt->setkey = shash_compat_setkey;
	400
	401	crt->digestsize = alg->digestsize;
	402
	403	return 0;
	404	}
	405
3b2f6df0 HX	406	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	407	{
	408	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	409	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	410	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	411	case CRYPTO_ALG_TYPE_AHASH_MASK:
	412	return crypto_init_shash_ops_async(tfm);
	413	}
	414
	415	return -EINVAL;
	416	}
	417
	418	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	419	u32 mask)
	420	{
5f7082ed HX	421	struct shash_alg *salg = __crypto_shash_alg(alg);
5f7082ed HX	422
3b2f6df0	423	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	424	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	425	return sizeof(struct shash_desc) + salg->descsize;
3b2f6df0 HX	426	case CRYPTO_ALG_TYPE_AHASH_MASK:
	427	return sizeof(struct crypto_shash *);
	428	}
	429
	430	return 0;
	431	}
	432
7b5a080b HX	433	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
	434	const struct crypto_type *frontend)
	435	{
7b5a080b HX	436	return 0;
	437	}
	438
	439	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
	440	const struct crypto_type *frontend)
	441	{
	442	return alg->cra_ctxsize;
	443	}
	444
	445	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	446	__attribute__ ((unused));
	447	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	448	{
	449	struct shash_alg *salg = __crypto_shash_alg(alg);
	450
	451	seq_printf(m, "type : shash\n");
	452	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	453	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	454	seq_printf(m, "descsize : %u\n", salg->descsize);
	455	}
	456
	457	static const struct crypto_type crypto_shash_type = {
3b2f6df0	458	.ctxsize = crypto_shash_ctxsize,
7b5a080b	459	.extsize = crypto_shash_extsize,
3b2f6df0	460	.init = crypto_init_shash_ops,
7b5a080b HX	461	.init_tfm = crypto_shash_init_tfm,
	462	#ifdef CONFIG_PROC_FS
	463	.show = crypto_shash_show,
	464	#endif
	465	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	466	.maskset = CRYPTO_ALG_TYPE_MASK,
	467	.type = CRYPTO_ALG_TYPE_SHASH,
	468	.tfmsize = offsetof(struct crypto_shash, base),
	469	};
	470
	471	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	472	u32 mask)
	473	{
3f683d61	474	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	475	}
	476	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	477
619a6ebd	478	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	479	{
	480	struct crypto_alg *base = &alg->base;
	481
	482	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	483	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	484	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	485	return -EINVAL;
	486
	487	base->cra_type = &crypto_shash_type;
	488	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	489	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c HX	490
	491	if (!alg->import)
	492	alg->import = shash_no_import;
	493	if (!alg->export)
	494	alg->export = shash_no_export;
	495
619a6ebd HX	496	return 0;
	497	}
	498
	499	int crypto_register_shash(struct shash_alg *alg)
	500	{
	501	struct crypto_alg *base = &alg->base;
	502	int err;
	503
	504	err = shash_prepare_alg(alg);
	505	if (err)
	506	return err;
7b5a080b HX	507
	508	return crypto_register_alg(base);
	509	}
	510	EXPORT_SYMBOL_GPL(crypto_register_shash);
	511
	512	int crypto_unregister_shash(struct shash_alg *alg)
	513	{
	514	return crypto_unregister_alg(&alg->base);
	515	}
	516	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	517
619a6ebd HX	518	int shash_register_instance(struct crypto_template *tmpl,
	519	struct shash_instance *inst)
	520	{
	521	int err;
	522
	523	err = shash_prepare_alg(&inst->alg);
	524	if (err)
	525	return err;
	526
	527	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	528	}
	529	EXPORT_SYMBOL_GPL(shash_register_instance);
	530
2e4fddd8 HX	531	void shash_free_instance(struct crypto_instance *inst)
	532	{
	533	crypto_drop_spawn(crypto_instance_ctx(inst));
	534	kfree(shash_instance(inst));
	535	}
	536	EXPORT_SYMBOL_GPL(shash_free_instance);
	537
94296999 HX	538	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	539	struct shash_alg *alg,
	540	struct crypto_instance *inst)
	541	{
	542	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	543	&crypto_shash_type);
	544	}
	545	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	546
7d6f5640 HX	547	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	548	{
	549	struct crypto_alg *alg;
	550
	551	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	552	return IS_ERR(alg) ? ERR_CAST(alg) :
	553	container_of(alg, struct shash_alg, base);
	554	}
	555	EXPORT_SYMBOL_GPL(shash_attr_alg);
	556
7b5a080b HX	557	MODULE_LICENSE("GPL");
7b5a080b HX	558	MODULE_DESCRIPTION("Synchronous cryptographic hash type");