[linux-2.6-block.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);

int crypto_shash_import(struct shash_desc *desc, const u8 *in)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *alg = crypto_shash_alg(tfm);

	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));

	if (alg->reinit)
		return alg->reinit(desc);

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_import);

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)
		return -EINVAL;

	base->cra_type = &crypto_shash_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
	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
dec8b786 HX	175	int crypto_shash_import(struct shash_desc desc, const u8 in)
	176	{
	177	struct crypto_shash *tfm = desc->tfm;
	178	struct shash_alg *alg = crypto_shash_alg(tfm);
	179
	180	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
	181
	182	if (alg->reinit)
deee2289	183	return alg->reinit(desc);
dec8b786 HX	184
	185	return 0;
	186	}
	187	EXPORT_SYMBOL_GPL(crypto_shash_import);
	188
3b2f6df0 HX	189	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	190	unsigned int keylen)
	191	{
	192	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	193
	194	return crypto_shash_setkey(*ctx, key, keylen);
	195	}
	196
	197	static int shash_async_init(struct ahash_request *req)
	198	{
	199	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	200	struct shash_desc *desc = ahash_request_ctx(req);
	201
	202	desc->tfm = *ctx;
	203	desc->flags = req->base.flags;
	204
	205	return crypto_shash_init(desc);
	206	}
	207
	208	static int shash_async_update(struct ahash_request *req)
	209	{
	210	struct shash_desc *desc = ahash_request_ctx(req);
	211	struct crypto_hash_walk walk;
	212	int nbytes;
	213
	214	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	215	nbytes = crypto_hash_walk_done(&walk, nbytes))
	216	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	217
	218	return nbytes;
	219	}
	220
	221	static int shash_async_final(struct ahash_request *req)
	222	{
	223	return crypto_shash_final(ahash_request_ctx(req), req->result);
	224	}
	225
	226	static int shash_async_digest(struct ahash_request *req)
	227	{
	228	struct scatterlist *sg = req->src;
	229	unsigned int offset = sg->offset;
	230	unsigned int nbytes = req->nbytes;
	231	int err;
	232
	233	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	234	struct crypto_shash **ctx =
	235	crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	236	struct shash_desc *desc = ahash_request_ctx(req);
	237	void *data;
	238
	239	desc->tfm = *ctx;
	240	desc->flags = req->base.flags;
	241
	242	data = crypto_kmap(sg_page(sg), 0);
	243	err = crypto_shash_digest(desc, data + offset, nbytes,
	244	req->result);
	245	crypto_kunmap(data, 0);
	246	crypto_yield(desc->flags);
	247	goto out;
	248	}
	249
	250	err = shash_async_init(req);
	251	if (err)
	252	goto out;
253
254	err = shash_async_update(req);
255	if (err)
256	goto out;
257
258	err = shash_async_final(req);
259
260	out:
261	return err;
262	}
263
264	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
265	{
266	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
267
268	crypto_free_shash(*ctx);
269	}
270
271	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
272	{
273	struct crypto_alg *calg = tfm->__crt_alg;
274	struct shash_alg *alg = __crypto_shash_alg(calg);
275	struct ahash_tfm *crt = &tfm->crt_ahash;
276	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
277	struct crypto_shash *shash;
278
279	if (!crypto_mod_get(calg))
280	return -EAGAIN;
281
3f683d61	282	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	283	if (IS_ERR(shash)) {
	284	crypto_mod_put(calg);
	285	return PTR_ERR(shash);
	286	}
	287
	288	*ctx = shash;
	289	tfm->exit = crypto_exit_shash_ops_async;
	290
	291	crt->init = shash_async_init;
	292	crt->update = shash_async_update;
	293	crt->final = shash_async_final;
	294	crt->digest = shash_async_digest;
	295	crt->setkey = shash_async_setkey;
	296
	297	crt->digestsize = alg->digestsize;
	298	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	299
	300	return 0;
	301	}
	302
5f7082ed HX	303	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	304	unsigned int keylen)
	305	{
	306	struct shash_desc *desc = crypto_hash_ctx(tfm);
	307
	308	return crypto_shash_setkey(desc->tfm, key, keylen);
	309	}
	310
	311	static int shash_compat_init(struct hash_desc *hdesc)
	312	{
	313	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	314
	315	desc->flags = hdesc->flags;
	316
	317	return crypto_shash_init(desc);
	318	}
	319
	320	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	321	unsigned int len)
	322	{
	323	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	324	struct crypto_hash_walk walk;
	325	int nbytes;
	326
	327	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	328	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	329	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	330
	331	return nbytes;
	332	}
	333
	334	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	335	{
	336	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
	337	}
	338
	339	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	340	unsigned int nbytes, u8 *out)
	341	{
	342	unsigned int offset = sg->offset;
	343	int err;
	344
	345	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	346	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	347	void *data;
	348
	349	desc->flags = hdesc->flags;
	350
	351	data = crypto_kmap(sg_page(sg), 0);
	352	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	353	crypto_kunmap(data, 0);
	354	crypto_yield(desc->flags);
	355	goto out;
	356	}
	357
	358	err = shash_compat_init(hdesc);
	359	if (err)
	360	goto out;
	361
	362	err = shash_compat_update(hdesc, sg, nbytes);
	363	if (err)
	364	goto out;
	365
	366	err = shash_compat_final(hdesc, out);
367
368	out:
369	return err;
370	}
371
372	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
373	{
374	struct shash_desc *desc= crypto_tfm_ctx(tfm);
375
376	crypto_free_shash(desc->tfm);
377	}
378
379	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
380	{
381	struct hash_tfm *crt = &tfm->crt_hash;
382	struct crypto_alg *calg = tfm->__crt_alg;
383	struct shash_alg *alg = __crypto_shash_alg(calg);
384	struct shash_desc *desc = crypto_tfm_ctx(tfm);
385	struct crypto_shash *shash;
386
4abfd73e AKR	387	if (!crypto_mod_get(calg))
	388	return -EAGAIN;
	389
3f683d61	390	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	391	if (IS_ERR(shash)) {
4abfd73e AKR	392	crypto_mod_put(calg);
5f7082ed	393	return PTR_ERR(shash);
4abfd73e	394	}
5f7082ed HX	395
	396	desc->tfm = shash;
	397	tfm->exit = crypto_exit_shash_ops_compat;
	398
	399	crt->init = shash_compat_init;
	400	crt->update = shash_compat_update;
	401	crt->final = shash_compat_final;
	402	crt->digest = shash_compat_digest;
	403	crt->setkey = shash_compat_setkey;
	404
	405	crt->digestsize = alg->digestsize;
	406
	407	return 0;
	408	}
	409
3b2f6df0 HX	410	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	411	{
	412	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	413	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	414	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	415	case CRYPTO_ALG_TYPE_AHASH_MASK:
	416	return crypto_init_shash_ops_async(tfm);
	417	}
	418
	419	return -EINVAL;
	420	}
	421
	422	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	423	u32 mask)
	424	{
5f7082ed HX	425	struct shash_alg *salg = __crypto_shash_alg(alg);
5f7082ed HX	426
3b2f6df0	427	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	428	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	429	return sizeof(struct shash_desc) + salg->descsize;
3b2f6df0 HX	430	case CRYPTO_ALG_TYPE_AHASH_MASK:
	431	return sizeof(struct crypto_shash *);
	432	}
	433
	434	return 0;
	435	}
	436
7b5a080b HX	437	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
	438	const struct crypto_type *frontend)
	439	{
7b5a080b HX	440	return 0;
	441	}
	442
	443	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
	444	const struct crypto_type *frontend)
	445	{
	446	return alg->cra_ctxsize;
	447	}
	448
	449	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	450	__attribute__ ((unused));
	451	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	452	{
	453	struct shash_alg *salg = __crypto_shash_alg(alg);
	454
	455	seq_printf(m, "type : shash\n");
	456	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	457	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	458	seq_printf(m, "descsize : %u\n", salg->descsize);
	459	}
	460
	461	static const struct crypto_type crypto_shash_type = {
3b2f6df0	462	.ctxsize = crypto_shash_ctxsize,
7b5a080b	463	.extsize = crypto_shash_extsize,
3b2f6df0	464	.init = crypto_init_shash_ops,
7b5a080b HX	465	.init_tfm = crypto_shash_init_tfm,
	466	#ifdef CONFIG_PROC_FS
	467	.show = crypto_shash_show,
	468	#endif
	469	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	470	.maskset = CRYPTO_ALG_TYPE_MASK,
	471	.type = CRYPTO_ALG_TYPE_SHASH,
	472	.tfmsize = offsetof(struct crypto_shash, base),
	473	};
	474
	475	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	476	u32 mask)
	477	{
3f683d61	478	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	479	}
	480	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	481
619a6ebd	482	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	483	{
	484	struct crypto_alg *base = &alg->base;
	485
	486	if (alg->digestsize > PAGE_SIZE / 8 \|\|
	487	alg->descsize > PAGE_SIZE / 8)
	488	return -EINVAL;
	489
	490	base->cra_type = &crypto_shash_type;
	491	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	492	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
619a6ebd HX	493	return 0;
	494	}
	495
	496	int crypto_register_shash(struct shash_alg *alg)
	497	{
	498	struct crypto_alg *base = &alg->base;
	499	int err;
	500
	501	err = shash_prepare_alg(alg);
	502	if (err)
	503	return err;
7b5a080b HX	504
	505	return crypto_register_alg(base);
	506	}
	507	EXPORT_SYMBOL_GPL(crypto_register_shash);
	508
	509	int crypto_unregister_shash(struct shash_alg *alg)
	510	{
	511	return crypto_unregister_alg(&alg->base);
	512	}
	513	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	514
619a6ebd HX	515	int shash_register_instance(struct crypto_template *tmpl,
	516	struct shash_instance *inst)
	517	{
	518	int err;
	519
	520	err = shash_prepare_alg(&inst->alg);
	521	if (err)
	522	return err;
	523
	524	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	525	}
	526	EXPORT_SYMBOL_GPL(shash_register_instance);
	527
2e4fddd8 HX	528	void shash_free_instance(struct crypto_instance *inst)
	529	{
	530	crypto_drop_spawn(crypto_instance_ctx(inst));
	531	kfree(shash_instance(inst));
	532	}
	533	EXPORT_SYMBOL_GPL(shash_free_instance);
	534
94296999 HX	535	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	536	struct shash_alg *alg,
	537	struct crypto_instance *inst)
	538	{
	539	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	540	&crypto_shash_type);
	541	}
	542	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	543
7d6f5640 HX	544	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	545	{
	546	struct crypto_alg *alg;
	547
	548	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	549	return IS_ERR(alg) ? ERR_CAST(alg) :
	550	container_of(alg, struct shash_alg, base);
	551	}
	552	EXPORT_SYMBOL_GPL(shash_attr_alg);
	553
7b5a080b HX	554	MODULE_LICENSE("GPL");
7b5a080b HX	555	MODULE_DESCRIPTION("Synchronous cryptographic hash type");