[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)
		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);
}

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->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;

	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
8267adab	145	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	146	return shash_finup_unaligned(desc, data, len, out);
	147
	148	return shash->finup(desc, data, len, out);
	149	}
	150	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	151
	152	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	153	unsigned int len, u8 *out)
	154	{
	155	return crypto_shash_init(desc) ?:
f88ad8de	156	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	157	}
	158
	159	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	160	unsigned int len, u8 *out)
	161	{
	162	struct crypto_shash *tfm = desc->tfm;
	163	struct shash_alg *shash = crypto_shash_alg(tfm);
	164	unsigned long alignmask = crypto_shash_alignmask(tfm);
	165
8267adab	166	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	167	return shash_digest_unaligned(desc, data, len, out);
	168
	169	return shash->digest(desc, data, len, out);
	170	}
	171	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	172
99d27e1c	173	static int shash_no_export(struct shash_desc desc, void out)
dec8b786	174	{
99d27e1c HX	175	return -ENOSYS;
99d27e1c HX	176	}
dec8b786	177
99d27e1c HX	178	static int shash_no_import(struct shash_desc desc, const void in)
	179	{
	180	return -ENOSYS;
dec8b786	181	}
dec8b786	182
3b2f6df0 HX	183	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	184	unsigned int keylen)
	185	{
	186	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	187
	188	return crypto_shash_setkey(*ctx, key, keylen);
	189	}
	190
	191	static int shash_async_init(struct ahash_request *req)
	192	{
	193	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	194	struct shash_desc *desc = ahash_request_ctx(req);
	195
	196	desc->tfm = *ctx;
	197	desc->flags = req->base.flags;
	198
	199	return crypto_shash_init(desc);
	200	}
	201
	202	static int shash_async_update(struct ahash_request *req)
	203	{
	204	struct shash_desc *desc = ahash_request_ctx(req);
	205	struct crypto_hash_walk walk;
	206	int nbytes;
	207
	208	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	209	nbytes = crypto_hash_walk_done(&walk, nbytes))
	210	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	211
	212	return nbytes;
	213	}
	214
	215	static int shash_async_final(struct ahash_request *req)
	216	{
	217	return crypto_shash_final(ahash_request_ctx(req), req->result);
	218	}
	219
	220	static int shash_async_digest(struct ahash_request *req)
	221	{
	222	struct scatterlist *sg = req->src;
	223	unsigned int offset = sg->offset;
	224	unsigned int nbytes = req->nbytes;
	225	int err;
	226
	227	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	228	struct crypto_shash **ctx =
	229	crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	230	struct shash_desc *desc = ahash_request_ctx(req);
	231	void *data;
	232
	233	desc->tfm = *ctx;
	234	desc->flags = req->base.flags;
	235
	236	data = crypto_kmap(sg_page(sg), 0);
	237	err = crypto_shash_digest(desc, data + offset, nbytes,
	238	req->result);
	239	crypto_kunmap(data, 0);
	240	crypto_yield(desc->flags);
	241	goto out;
	242	}
	243
	244	err = shash_async_init(req);
	245	if (err)
	246	goto out;
247
248	err = shash_async_update(req);
249	if (err)
250	goto out;
251
252	err = shash_async_final(req);
253
254	out:
255	return err;
256	}
257
258	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
259	{
260	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
261
262	crypto_free_shash(*ctx);
263	}
264
265	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
266	{
267	struct crypto_alg *calg = tfm->__crt_alg;
268	struct shash_alg *alg = __crypto_shash_alg(calg);
269	struct ahash_tfm *crt = &tfm->crt_ahash;
270	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
271	struct crypto_shash *shash;
272
273	if (!crypto_mod_get(calg))
274	return -EAGAIN;
275
3f683d61	276	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	277	if (IS_ERR(shash)) {
	278	crypto_mod_put(calg);
	279	return PTR_ERR(shash);
	280	}
	281
	282	*ctx = shash;
	283	tfm->exit = crypto_exit_shash_ops_async;
	284
	285	crt->init = shash_async_init;
	286	crt->update = shash_async_update;
	287	crt->final = shash_async_final;
	288	crt->digest = shash_async_digest;
	289	crt->setkey = shash_async_setkey;
	290
	291	crt->digestsize = alg->digestsize;
	292	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	293
	294	return 0;
	295	}
	296
5f7082ed HX	297	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	298	unsigned int keylen)
	299	{
	300	struct shash_desc *desc = crypto_hash_ctx(tfm);
	301
	302	return crypto_shash_setkey(desc->tfm, key, keylen);
	303	}
	304
	305	static int shash_compat_init(struct hash_desc *hdesc)
	306	{
	307	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	308
	309	desc->flags = hdesc->flags;
	310
	311	return crypto_shash_init(desc);
	312	}
	313
	314	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	315	unsigned int len)
	316	{
	317	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	318	struct crypto_hash_walk walk;
	319	int nbytes;
	320
	321	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	322	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	323	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	324
	325	return nbytes;
	326	}
	327
	328	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	329	{
	330	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
	331	}
	332
	333	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	334	unsigned int nbytes, u8 *out)
	335	{
	336	unsigned int offset = sg->offset;
	337	int err;
	338
	339	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	340	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	341	void *data;
	342
	343	desc->flags = hdesc->flags;
	344
	345	data = crypto_kmap(sg_page(sg), 0);
	346	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	347	crypto_kunmap(data, 0);
	348	crypto_yield(desc->flags);
	349	goto out;
	350	}
	351
	352	err = shash_compat_init(hdesc);
	353	if (err)
	354	goto out;
	355
	356	err = shash_compat_update(hdesc, sg, nbytes);
	357	if (err)
	358	goto out;
	359
	360	err = shash_compat_final(hdesc, out);
361
362	out:
363	return err;
364	}
365
366	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
367	{
368	struct shash_desc *desc= crypto_tfm_ctx(tfm);
369
370	crypto_free_shash(desc->tfm);
371	}
372
373	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
374	{
375	struct hash_tfm *crt = &tfm->crt_hash;
376	struct crypto_alg *calg = tfm->__crt_alg;
377	struct shash_alg *alg = __crypto_shash_alg(calg);
378	struct shash_desc *desc = crypto_tfm_ctx(tfm);
379	struct crypto_shash *shash;
380
4abfd73e AKR	381	if (!crypto_mod_get(calg))
	382	return -EAGAIN;
	383
3f683d61	384	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	385	if (IS_ERR(shash)) {
4abfd73e AKR	386	crypto_mod_put(calg);
5f7082ed	387	return PTR_ERR(shash);
4abfd73e	388	}
5f7082ed HX	389
	390	desc->tfm = shash;
	391	tfm->exit = crypto_exit_shash_ops_compat;
	392
	393	crt->init = shash_compat_init;
	394	crt->update = shash_compat_update;
	395	crt->final = shash_compat_final;
	396	crt->digest = shash_compat_digest;
	397	crt->setkey = shash_compat_setkey;
	398
	399	crt->digestsize = alg->digestsize;
	400
	401	return 0;
	402	}
	403
3b2f6df0 HX	404	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	405	{
	406	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	407	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	408	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	409	case CRYPTO_ALG_TYPE_AHASH_MASK:
	410	return crypto_init_shash_ops_async(tfm);
	411	}
	412
	413	return -EINVAL;
	414	}
	415
	416	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	417	u32 mask)
	418	{
5f7082ed HX	419	struct shash_alg *salg = __crypto_shash_alg(alg);
5f7082ed HX	420
3b2f6df0	421	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	422	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	423	return sizeof(struct shash_desc) + salg->descsize;
3b2f6df0 HX	424	case CRYPTO_ALG_TYPE_AHASH_MASK:
	425	return sizeof(struct crypto_shash *);
	426	}
	427
	428	return 0;
	429	}
	430
7b5a080b HX	431	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
	432	const struct crypto_type *frontend)
	433	{
7b5a080b HX	434	return 0;
	435	}
	436
	437	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
	438	const struct crypto_type *frontend)
	439	{
	440	return alg->cra_ctxsize;
	441	}
	442
	443	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	444	__attribute__ ((unused));
	445	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	446	{
	447	struct shash_alg *salg = __crypto_shash_alg(alg);
	448
	449	seq_printf(m, "type : shash\n");
	450	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	451	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	452	seq_printf(m, "descsize : %u\n", salg->descsize);
	453	}
	454
	455	static const struct crypto_type crypto_shash_type = {
3b2f6df0	456	.ctxsize = crypto_shash_ctxsize,
7b5a080b	457	.extsize = crypto_shash_extsize,
3b2f6df0	458	.init = crypto_init_shash_ops,
7b5a080b HX	459	.init_tfm = crypto_shash_init_tfm,
	460	#ifdef CONFIG_PROC_FS
	461	.show = crypto_shash_show,
	462	#endif
	463	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	464	.maskset = CRYPTO_ALG_TYPE_MASK,
	465	.type = CRYPTO_ALG_TYPE_SHASH,
	466	.tfmsize = offsetof(struct crypto_shash, base),
	467	};
	468
	469	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	470	u32 mask)
	471	{
3f683d61	472	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	473	}
	474	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	475
619a6ebd	476	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	477	{
	478	struct crypto_alg *base = &alg->base;
	479
	480	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	481	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	482	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	483	return -EINVAL;
	484
	485	base->cra_type = &crypto_shash_type;
	486	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	487	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	488
8267adab HX	489	if (!alg->finup)
	490	alg->finup = shash_finup_unaligned;
	491	if (!alg->digest)
	492	alg->digest = shash_digest_unaligned;
99d27e1c HX	493	if (!alg->import)
	494	alg->import = shash_no_import;
	495	if (!alg->export)
	496	alg->export = shash_no_export;
	497
619a6ebd HX	498	return 0;
	499	}
	500
	501	int crypto_register_shash(struct shash_alg *alg)
	502	{
	503	struct crypto_alg *base = &alg->base;
	504	int err;
	505
	506	err = shash_prepare_alg(alg);
	507	if (err)
	508	return err;
7b5a080b HX	509
	510	return crypto_register_alg(base);
	511	}
	512	EXPORT_SYMBOL_GPL(crypto_register_shash);
	513
	514	int crypto_unregister_shash(struct shash_alg *alg)
	515	{
	516	return crypto_unregister_alg(&alg->base);
	517	}
	518	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	519
619a6ebd HX	520	int shash_register_instance(struct crypto_template *tmpl,
	521	struct shash_instance *inst)
	522	{
	523	int err;
	524
	525	err = shash_prepare_alg(&inst->alg);
	526	if (err)
	527	return err;
	528
	529	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	530	}
	531	EXPORT_SYMBOL_GPL(shash_register_instance);
	532
2e4fddd8 HX	533	void shash_free_instance(struct crypto_instance *inst)
	534	{
	535	crypto_drop_spawn(crypto_instance_ctx(inst));
	536	kfree(shash_instance(inst));
	537	}
	538	EXPORT_SYMBOL_GPL(shash_free_instance);
	539
94296999 HX	540	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	541	struct shash_alg *alg,
	542	struct crypto_instance *inst)
	543	{
	544	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	545	&crypto_shash_type);
	546	}
	547	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	548
7d6f5640 HX	549	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	550	{
	551	struct crypto_alg *alg;
	552
	553	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	554	return IS_ERR(alg) ? ERR_CAST(alg) :
	555	container_of(alg, struct shash_alg, base);
	556	}
	557	EXPORT_SYMBOL_GPL(shash_attr_alg);
	558
7b5a080b HX	559	MODULE_LICENSE("GPL");
7b5a080b HX	560	MODULE_DESCRIPTION("Synchronous cryptographic hash type");