[net-next-2.6.git] / crypto / shash.c

/*
 * Synchronous Cryptographic Hash operations.
 *
 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/scatterwalk.h>
#include <crypto/internal/hash.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include "internal.h"

static const struct crypto_type crypto_shash_type;

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

static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
				  unsigned int keylen)
{
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	unsigned long absize;
	u8 *buffer, *alignbuffer;
	int err;

	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	buffer = kmalloc(absize, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	err = shash->setkey(tfm, alignbuffer, keylen);
	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 ((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);
}

int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
{
	struct crypto_hash_walk walk;
	int nbytes;

	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	     nbytes = crypto_hash_walk_done(&walk, nbytes))
		nbytes = crypto_shash_update(desc, walk.data, nbytes);

	return nbytes;
}
EXPORT_SYMBOL_GPL(shash_ahash_update);

static int shash_async_update(struct ahash_request *req)
{
	return shash_ahash_update(req, ahash_request_ctx(req));
}

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

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

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

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

	return err;
}
EXPORT_SYMBOL_GPL(shash_ahash_digest);

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

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

	return shash_ahash_digest(req, desc);
}

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

	crypto_free_shash(*ctx);
}

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 **descp = crypto_hash_ctx(tfm);
	struct shash_desc *desc = *descp;

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

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

	desc->flags = hdesc->flags;

	return crypto_shash_init(desc);
}

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

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

	return nbytes;
}

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

	return crypto_shash_final(*descp, out);
}

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

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

		desc->flags = hdesc->flags;

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

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

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

	err = shash_compat_final(hdesc, out);

out:
	return err;
}

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

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

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

	if (!crypto_mod_get(calg))
		return -EAGAIN;

	shash = crypto_create_tfm(calg, &crypto_shash_type);
	if (IS_ERR(shash)) {
		crypto_mod_put(calg);
		return PTR_ERR(shash);
	}

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

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

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

	crt->digestsize = alg->digestsize;

	return 0;
}

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

	return 0;
}

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

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

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

static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct shash_alg *salg = __crypto_shash_alg(alg);

	seq_printf(m, "type         : shash\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
}

static const struct crypto_type crypto_shash_type = {
	.ctxsize = crypto_shash_ctxsize,
	.extsize = crypto_shash_extsize,
	.init = crypto_init_shash_ops,
	.init_tfm = crypto_shash_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_shash_show,
#endif
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SHASH,
	.tfmsize = offsetof(struct crypto_shash, base),
};

struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
					u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_shash);

static int shash_prepare_alg(struct shash_alg *alg)
{
	struct crypto_alg *base = &alg->base;

	if (alg->digestsize > PAGE_SIZE / 8 ||
	    alg->descsize > PAGE_SIZE / 8 ||
	    alg->statesize > PAGE_SIZE / 8)
		return -EINVAL;

	base->cra_type = &crypto_shash_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;

	if (!alg->finup)
		alg->finup = shash_finup_unaligned;
	if (!alg->digest)
		alg->digest = shash_digest_unaligned;
	if (!alg->import)
		alg->import = shash_no_import;
	if (!alg->export)
		alg->export = shash_no_export;
	if (!alg->setkey)
		alg->setkey = shash_no_setkey;

	return 0;
}

int crypto_register_shash(struct shash_alg *alg)
{
	struct crypto_alg *base = &alg->base;
	int err;

	err = shash_prepare_alg(alg);
	if (err)
		return err;

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_shash);

int crypto_unregister_shash(struct shash_alg *alg)
{
	return crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_shash);

int shash_register_instance(struct crypto_template *tmpl,
			    struct shash_instance *inst)
{
	int err;

	err = shash_prepare_alg(&inst->alg);
	if (err)
		return err;

	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_register_instance);

void shash_free_instance(struct crypto_instance *inst)
{
	crypto_drop_spawn(crypto_instance_ctx(inst));
	kfree(shash_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_free_instance);

int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
			    struct shash_alg *alg,
			    struct crypto_instance *inst)
{
	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
				  &crypto_shash_type);
}
EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);

struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	return IS_ERR(alg) ? ERR_CAST(alg) :
	       container_of(alg, struct shash_alg, base);
}
EXPORT_SYMBOL_GPL(shash_attr_alg);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous cryptographic hash type");
Commit	Line	Data
7b5a080b HX	1	/*
	2	* Synchronous Cryptographic Hash operations.
	3	*
	4	* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
3b2f6df0	13	#include <crypto/scatterwalk.h>
7b5a080b HX	14	#include <crypto/internal/hash.h>
	15	#include <linux/err.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/slab.h>
	19	#include <linux/seq_file.h>
	20
3b2f6df0 HX	21	#include "internal.h"
3b2f6df0 HX	22
3f683d61 HX	23	static const struct crypto_type crypto_shash_type;
3f683d61 HX	24
57cfe44b HX	25	static int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	26	unsigned int keylen)
	27	{
	28	return -ENOSYS;
	29	}
	30
7b5a080b HX	31	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	32	unsigned int keylen)
	33	{
	34	struct shash_alg *shash = crypto_shash_alg(tfm);
	35	unsigned long alignmask = crypto_shash_alignmask(tfm);
	36	unsigned long absize;
	37	u8 buffer, alignbuffer;
	38	int err;
	39
	40	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	41	buffer = kmalloc(absize, GFP_KERNEL);
	42	if (!buffer)
	43	return -ENOMEM;
	44
	45	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	46	memcpy(alignbuffer, key, keylen);
	47	err = shash->setkey(tfm, alignbuffer, keylen);
	48	memset(alignbuffer, 0, keylen);
	49	kfree(buffer);
	50	return err;
	51	}
	52
	53	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	54	unsigned int keylen)
	55	{
	56	struct shash_alg *shash = crypto_shash_alg(tfm);
	57	unsigned long alignmask = crypto_shash_alignmask(tfm);
	58
	59	if ((unsigned long)key & alignmask)
	60	return shash_setkey_unaligned(tfm, key, keylen);
	61
	62	return shash->setkey(tfm, key, keylen);
	63	}
	64	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	65
	66	static inline unsigned int shash_align_buffer_size(unsigned len,
	67	unsigned long mask)
	68	{
	69	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	70	}
	71
	72	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	73	unsigned int len)
	74	{
	75	struct crypto_shash *tfm = desc->tfm;
	76	struct shash_alg *shash = crypto_shash_alg(tfm);
	77	unsigned long alignmask = crypto_shash_alignmask(tfm);
	78	unsigned int unaligned_len = alignmask + 1 -
	79	((unsigned long)data & alignmask);
	80	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
	81	__attribute__ ((aligned));
	82
f4f68993 YS	83	if (unaligned_len > len)
	84	unaligned_len = len;
	85
7b5a080b HX	86	memcpy(buf, data, unaligned_len);
	87
	88	return shash->update(desc, buf, unaligned_len) ?:
	89	shash->update(desc, data + unaligned_len, len - unaligned_len);
	90	}
	91
	92	int crypto_shash_update(struct shash_desc desc, const u8 data,
	93	unsigned int len)
	94	{
	95	struct crypto_shash *tfm = desc->tfm;
	96	struct shash_alg *shash = crypto_shash_alg(tfm);
	97	unsigned long alignmask = crypto_shash_alignmask(tfm);
	98
	99	if ((unsigned long)data & alignmask)
	100	return shash_update_unaligned(desc, data, len);
	101
	102	return shash->update(desc, data, len);
	103	}
	104	EXPORT_SYMBOL_GPL(crypto_shash_update);
	105
	106	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	107	{
	108	struct crypto_shash *tfm = desc->tfm;
	109	unsigned long alignmask = crypto_shash_alignmask(tfm);
	110	struct shash_alg *shash = crypto_shash_alg(tfm);
	111	unsigned int ds = crypto_shash_digestsize(tfm);
	112	u8 buf[shash_align_buffer_size(ds, alignmask)]
	113	__attribute__ ((aligned));
	114	int err;
	115
	116	err = shash->final(desc, buf);
	117	memcpy(out, buf, ds);
	118	return err;
	119	}
	120
	121	int crypto_shash_final(struct shash_desc desc, u8 out)
	122	{
	123	struct crypto_shash *tfm = desc->tfm;
	124	struct shash_alg *shash = crypto_shash_alg(tfm);
	125	unsigned long alignmask = crypto_shash_alignmask(tfm);
	126
	127	if ((unsigned long)out & alignmask)
	128	return shash_final_unaligned(desc, out);
	129
	130	return shash->final(desc, out);
	131	}
	132	EXPORT_SYMBOL_GPL(crypto_shash_final);
	133
	134	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	135	unsigned int len, u8 *out)
	136	{
	137	return crypto_shash_update(desc, data, len) ?:
	138	crypto_shash_final(desc, out);
	139	}
	140
	141	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	142	unsigned int len, u8 *out)
	143	{
	144	struct crypto_shash *tfm = desc->tfm;
	145	struct shash_alg *shash = crypto_shash_alg(tfm);
	146	unsigned long alignmask = crypto_shash_alignmask(tfm);
	147
8267adab	148	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	149	return shash_finup_unaligned(desc, data, len, out);
	150
	151	return shash->finup(desc, data, len, out);
	152	}
	153	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	154
	155	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	156	unsigned int len, u8 *out)
	157	{
	158	return crypto_shash_init(desc) ?:
f88ad8de	159	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	160	}
	161
	162	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	163	unsigned int len, u8 *out)
	164	{
	165	struct crypto_shash *tfm = desc->tfm;
	166	struct shash_alg *shash = crypto_shash_alg(tfm);
	167	unsigned long alignmask = crypto_shash_alignmask(tfm);
	168
8267adab	169	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	170	return shash_digest_unaligned(desc, data, len, out);
	171
	172	return shash->digest(desc, data, len, out);
	173	}
	174	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	175
99d27e1c	176	static int shash_no_export(struct shash_desc desc, void out)
dec8b786	177	{
99d27e1c HX	178	return -ENOSYS;
99d27e1c HX	179	}
dec8b786	180
99d27e1c HX	181	static int shash_no_import(struct shash_desc desc, const void in)
	182	{
	183	return -ENOSYS;
dec8b786	184	}
dec8b786	185
3b2f6df0 HX	186	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	187	unsigned int keylen)
	188	{
	189	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	190
	191	return crypto_shash_setkey(*ctx, key, keylen);
	192	}
	193
	194	static int shash_async_init(struct ahash_request *req)
	195	{
	196	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	197	struct shash_desc *desc = ahash_request_ctx(req);
	198
	199	desc->tfm = *ctx;
	200	desc->flags = req->base.flags;
	201
	202	return crypto_shash_init(desc);
	203	}
	204
7eddf95e	205	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	206	{
3b2f6df0 HX	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	}
7eddf95e HX	216	EXPORT_SYMBOL_GPL(shash_ahash_update);
	217
	218	static int shash_async_update(struct ahash_request *req)
	219	{
	220	return shash_ahash_update(req, ahash_request_ctx(req));
	221	}
3b2f6df0 HX	222
	223	static int shash_async_final(struct ahash_request *req)
	224	{
	225	return crypto_shash_final(ahash_request_ctx(req), req->result);
	226	}
	227
7eddf95e	228	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0 HX	229	{
	230	struct scatterlist *sg = req->src;
	231	unsigned int offset = sg->offset;
	232	unsigned int nbytes = req->nbytes;
	233	int err;
	234
	235	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
3b2f6df0 HX	236	void *data;
3b2f6df0 HX	237
3b2f6df0 HX	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);
7eddf95e HX	243	} else
	244	err = crypto_shash_init(desc) ?:
	245	shash_ahash_update(req, desc) ?:
	246	crypto_shash_final(desc, req->result);
3b2f6df0	247
7eddf95e HX	248	return err;
	249	}
	250	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	251
7eddf95e HX	252	static int shash_async_digest(struct ahash_request *req)
	253	{
	254	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	255	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	256
7eddf95e HX	257	desc->tfm = *ctx;
7eddf95e HX	258	desc->flags = req->base.flags;
3b2f6df0	259
7eddf95e	260	return shash_ahash_digest(req, desc);
3b2f6df0 HX	261	}
	262
	263	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	264	{
	265	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	266
	267	crypto_free_shash(*ctx);
	268	}
	269
	270	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
	271	{
	272	struct crypto_alg *calg = tfm->__crt_alg;
	273	struct shash_alg *alg = __crypto_shash_alg(calg);
	274	struct ahash_tfm *crt = &tfm->crt_ahash;
	275	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	276	struct crypto_shash *shash;
	277
	278	if (!crypto_mod_get(calg))
	279	return -EAGAIN;
	280
3f683d61	281	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	282	if (IS_ERR(shash)) {
	283	crypto_mod_put(calg);
	284	return PTR_ERR(shash);
	285	}
	286
	287	*ctx = shash;
	288	tfm->exit = crypto_exit_shash_ops_async;
	289
	290	crt->init = shash_async_init;
	291	crt->update = shash_async_update;
	292	crt->final = shash_async_final;
	293	crt->digest = shash_async_digest;
	294	crt->setkey = shash_async_setkey;
	295
	296	crt->digestsize = alg->digestsize;
	297	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	298
	299	return 0;
	300	}
	301
5f7082ed HX	302	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	303	unsigned int keylen)
	304	{
113adefc HX	305	struct shash_desc **descp = crypto_hash_ctx(tfm);
113adefc HX	306	struct shash_desc desc = descp;
5f7082ed HX	307
	308	return crypto_shash_setkey(desc->tfm, key, keylen);
	309	}
	310
	311	static int shash_compat_init(struct hash_desc *hdesc)
	312	{
113adefc HX	313	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	314	struct shash_desc desc = descp;
5f7082ed HX	315
	316	desc->flags = hdesc->flags;
	317
	318	return crypto_shash_init(desc);
	319	}
	320
	321	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	322	unsigned int len)
	323	{
113adefc HX	324	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	325	struct shash_desc desc = descp;
5f7082ed HX	326	struct crypto_hash_walk walk;
	327	int nbytes;
	328
	329	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	330	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	331	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	332
	333	return nbytes;
	334	}
	335
	336	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	337	{
113adefc HX	338	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	339
	340	return crypto_shash_final(*descp, out);
5f7082ed HX	341	}
	342
	343	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	344	unsigned int nbytes, u8 *out)
	345	{
	346	unsigned int offset = sg->offset;
	347	int err;
	348
	349	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
113adefc HX	350	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	351	struct shash_desc desc = descp;
5f7082ed HX	352	void *data;
	353
	354	desc->flags = hdesc->flags;
	355
	356	data = crypto_kmap(sg_page(sg), 0);
	357	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	358	crypto_kunmap(data, 0);
	359	crypto_yield(desc->flags);
	360	goto out;
	361	}
	362
	363	err = shash_compat_init(hdesc);
	364	if (err)
	365	goto out;
	366
	367	err = shash_compat_update(hdesc, sg, nbytes);
	368	if (err)
	369	goto out;
	370
	371	err = shash_compat_final(hdesc, out);
	372
	373	out:
	374	return err;
	375	}
	376
	377	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
	378	{
113adefc HX	379	struct shash_desc **descp = crypto_tfm_ctx(tfm);
113adefc HX	380	struct shash_desc desc = descp;
5f7082ed HX	381
5f7082ed HX	382	crypto_free_shash(desc->tfm);
113adefc	383	kzfree(desc);
5f7082ed HX	384	}
	385
	386	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
	387	{
	388	struct hash_tfm *crt = &tfm->crt_hash;
	389	struct crypto_alg *calg = tfm->__crt_alg;
	390	struct shash_alg *alg = __crypto_shash_alg(calg);
113adefc	391	struct shash_desc **descp = crypto_tfm_ctx(tfm);
5f7082ed	392	struct crypto_shash *shash;
113adefc	393	struct shash_desc *desc;
5f7082ed	394
4abfd73e AKR	395	if (!crypto_mod_get(calg))
	396	return -EAGAIN;
	397
3f683d61	398	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	399	if (IS_ERR(shash)) {
4abfd73e AKR	400	crypto_mod_put(calg);
5f7082ed	401	return PTR_ERR(shash);
4abfd73e	402	}
5f7082ed	403
113adefc HX	404	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
	405	GFP_KERNEL);
	406	if (!desc) {
	407	crypto_free_shash(shash);
	408	return -ENOMEM;
	409	}
	410
	411	*descp = desc;
5f7082ed HX	412	desc->tfm = shash;
	413	tfm->exit = crypto_exit_shash_ops_compat;
	414
	415	crt->init = shash_compat_init;
	416	crt->update = shash_compat_update;
	417	crt->final = shash_compat_final;
	418	crt->digest = shash_compat_digest;
	419	crt->setkey = shash_compat_setkey;
	420
	421	crt->digestsize = alg->digestsize;
	422
	423	return 0;
	424	}
	425
3b2f6df0 HX	426	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	427	{
	428	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	429	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	430	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	431	case CRYPTO_ALG_TYPE_AHASH_MASK:
	432	return crypto_init_shash_ops_async(tfm);
	433	}
	434
	435	return -EINVAL;
	436	}
	437
	438	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	439	u32 mask)
	440	{
	441	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed	442	case CRYPTO_ALG_TYPE_HASH_MASK:
113adefc	443	return sizeof(struct shash_desc *);
3b2f6df0 HX	444	case CRYPTO_ALG_TYPE_AHASH_MASK:
	445	return sizeof(struct crypto_shash *);
	446	}
	447
	448	return 0;
	449	}
	450
2ca33da1	451	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	452	{
113adefc HX	453	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	454
	455	hash->descsize = crypto_shash_alg(hash)->descsize;
7b5a080b HX	456	return 0;
	457	}
	458
2ca33da1	459	static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
7b5a080b HX	460	{
	461	return alg->cra_ctxsize;
	462	}
	463
	464	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	465	__attribute__ ((unused));
	466	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	467	{
	468	struct shash_alg *salg = __crypto_shash_alg(alg);
	469
	470	seq_printf(m, "type : shash\n");
	471	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	472	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	473	}
	474
	475	static const struct crypto_type crypto_shash_type = {
3b2f6df0	476	.ctxsize = crypto_shash_ctxsize,
7b5a080b	477	.extsize = crypto_shash_extsize,
3b2f6df0	478	.init = crypto_init_shash_ops,
7b5a080b HX	479	.init_tfm = crypto_shash_init_tfm,
	480	#ifdef CONFIG_PROC_FS
	481	.show = crypto_shash_show,
	482	#endif
	483	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	484	.maskset = CRYPTO_ALG_TYPE_MASK,
	485	.type = CRYPTO_ALG_TYPE_SHASH,
	486	.tfmsize = offsetof(struct crypto_shash, base),
	487	};
	488
	489	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	490	u32 mask)
	491	{
3f683d61	492	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	493	}
	494	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	495
619a6ebd	496	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	497	{
	498	struct crypto_alg *base = &alg->base;
	499
	500	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	501	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	502	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	503	return -EINVAL;
	504
	505	base->cra_type = &crypto_shash_type;
	506	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	507	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	508
8267adab HX	509	if (!alg->finup)
	510	alg->finup = shash_finup_unaligned;
	511	if (!alg->digest)
	512	alg->digest = shash_digest_unaligned;
99d27e1c HX	513	if (!alg->import)
	514	alg->import = shash_no_import;
	515	if (!alg->export)
	516	alg->export = shash_no_export;
57cfe44b HX	517	if (!alg->setkey)
57cfe44b HX	518	alg->setkey = shash_no_setkey;
99d27e1c	519
619a6ebd HX	520	return 0;
	521	}
	522
	523	int crypto_register_shash(struct shash_alg *alg)
	524	{
	525	struct crypto_alg *base = &alg->base;
	526	int err;
	527
	528	err = shash_prepare_alg(alg);
	529	if (err)
	530	return err;
7b5a080b HX	531
	532	return crypto_register_alg(base);
	533	}
	534	EXPORT_SYMBOL_GPL(crypto_register_shash);
	535
	536	int crypto_unregister_shash(struct shash_alg *alg)
	537	{
	538	return crypto_unregister_alg(&alg->base);
	539	}
	540	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	541
619a6ebd HX	542	int shash_register_instance(struct crypto_template *tmpl,
	543	struct shash_instance *inst)
	544	{
	545	int err;
	546
	547	err = shash_prepare_alg(&inst->alg);
	548	if (err)
	549	return err;
	550
	551	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	552	}
	553	EXPORT_SYMBOL_GPL(shash_register_instance);
	554
2e4fddd8 HX	555	void shash_free_instance(struct crypto_instance *inst)
	556	{
	557	crypto_drop_spawn(crypto_instance_ctx(inst));
	558	kfree(shash_instance(inst));
	559	}
	560	EXPORT_SYMBOL_GPL(shash_free_instance);
	561
94296999 HX	562	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	563	struct shash_alg *alg,
	564	struct crypto_instance *inst)
	565	{
	566	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	567	&crypto_shash_type);
	568	}
	569	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	570
7d6f5640 HX	571	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	572	{
	573	struct crypto_alg *alg;
	574
	575	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	576	return IS_ERR(alg) ? ERR_CAST(alg) :
	577	container_of(alg, struct shash_alg, base);
	578	}
	579	EXPORT_SYMBOL_GPL(shash_attr_alg);
	580
7b5a080b HX	581	MODULE_LICENSE("GPL");
7b5a080b HX	582	MODULE_DESCRIPTION("Synchronous cryptographic hash type");