[linux.git] / crypto / shash.c

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

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

#include "internal.h"

static const struct crypto_type crypto_shash_type;

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

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

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

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

int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
			unsigned int keylen)
{
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

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

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

static inline unsigned int shash_align_buffer_size(unsigned len,
						   unsigned long mask)
{
	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
}

static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
				  unsigned int len)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	unsigned int unaligned_len = alignmask + 1 -
				     ((unsigned long)data & alignmask);
	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
		__attribute__ ((aligned));
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	if (unaligned_len > len)
		unaligned_len = len;

	memcpy(buf, data, unaligned_len);
	err = shash->update(desc, buf, unaligned_len);
	memset(buf, 0, unaligned_len);

	return err ?:
	       shash->update(desc, data + unaligned_len, len - unaligned_len);
}

int crypto_shash_update(struct shash_desc *desc, const u8 *data,
			unsigned int len)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)data & alignmask)
		return shash_update_unaligned(desc, data, len);

	return shash->update(desc, data, len);
}
EXPORT_SYMBOL_GPL(crypto_shash_update);

static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned int ds = crypto_shash_digestsize(tfm);
	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
		__attribute__ ((aligned));
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
	int err;

	err = shash->final(desc, buf);
	if (err)
		goto out;

	memcpy(out, buf, ds);

out:
	memset(buf, 0, ds);
	return err;
}

int crypto_shash_final(struct shash_desc *desc, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)out & alignmask)
		return shash_final_unaligned(desc, out);

	return shash->final(desc, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_final);

static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
				 unsigned int len, u8 *out)
{
	return crypto_shash_update(desc, data, len) ?:
	       crypto_shash_final(desc, out);
}

int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
		       unsigned int len, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if (((unsigned long)data | (unsigned long)out) & alignmask)
		return shash_finup_unaligned(desc, data, len, out);

	return shash->finup(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_finup);

static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
				  unsigned int len, u8 *out)
{
	return crypto_shash_init(desc) ?:
	       crypto_shash_finup(desc, data, len, out);
}

int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if (((unsigned long)data | (unsigned long)out) & alignmask)
		return shash_digest_unaligned(desc, data, len, out);

	return shash->digest(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_digest);

static int shash_default_export(struct shash_desc *desc, void *out)
{
	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
	return 0;
}

static int shash_default_import(struct shash_desc *desc, const void *in)
{
	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
	return 0;
}

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

	nbytes = crypto_hash_walk_first(req, &walk);
	if (!nbytes)
		return crypto_shash_final(desc, req->result);

	do {
		nbytes = crypto_hash_walk_last(&walk) ?
			 crypto_shash_finup(desc, walk.data, nbytes,
					    req->result) :
			 crypto_shash_update(desc, walk.data, nbytes);
		nbytes = crypto_hash_walk_done(&walk, nbytes);
	} while (nbytes > 0);

	return nbytes;
}
EXPORT_SYMBOL_GPL(shash_ahash_finup);

static int shash_async_finup(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_finup(req, desc);
}

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_finup(req, desc);

	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 int shash_async_export(struct ahash_request *req, void *out)
{
	return crypto_shash_export(ahash_request_ctx(req), out);
}

static int shash_async_import(struct ahash_request *req, const void *in)
{
	return crypto_shash_import(ahash_request_ctx(req), in);
}

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

	crypto_free_shash(*ctx);
}

int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_alg *calg = tfm->__crt_alg;
	struct shash_alg *alg = __crypto_shash_alg(calg);
	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	struct crypto_shash *shash;

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

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

	*ctx = shash;
	tfm->exit = crypto_exit_shash_ops_async;

	crt->init = shash_async_init;
	crt->update = shash_async_update;
	crt->final = shash_async_final;
	crt->finup = shash_async_finup;
	crt->digest = shash_async_digest;

	if (alg->setkey)
		crt->setkey = shash_async_setkey;
	if (alg->export)
		crt->export = shash_async_export;
	if (alg->import)
		crt->import = shash_async_import;

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

	return 0;
}

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

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

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

	desc->flags = hdesc->flags;

	return crypto_shash_init(desc);
}

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

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

	return nbytes;
}

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

	return crypto_shash_final(*descp, out);
}

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

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

		desc->flags = hdesc->flags;

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

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

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

	err = shash_compat_final(hdesc, out);

out:
	return err;
}

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

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

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

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

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

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

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

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

	crt->digestsize = alg->digestsize;

	return 0;
}

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

	return -EINVAL;
}

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

	if (!alg->finup)
		alg->finup = shash_finup_unaligned;
	if (!alg->digest)
		alg->digest = shash_digest_unaligned;
	if (!alg->export) {
		alg->export = shash_default_export;
		alg->import = shash_default_import;
		alg->statesize = alg->descsize;
	}
	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 <[email protected]>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
3b2f6df0	13	#include <crypto/scatterwalk.h>
7b5a080b HX	14	#include <crypto/internal/hash.h>
	15	#include <linux/err.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/slab.h>
	19	#include <linux/seq_file.h>
	20
3b2f6df0 HX	21	#include "internal.h"
3b2f6df0 HX	22
3f683d61 HX	23	static const struct crypto_type crypto_shash_type;
3f683d61 HX	24
57cfe44b HX	25	static int shash_no_setkey(struct crypto_shash tfm, const u8 key,
	26	unsigned int keylen)
	27	{
	28	return -ENOSYS;
	29	}
	30
7b5a080b HX	31	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	32	unsigned int keylen)
	33	{
	34	struct shash_alg *shash = crypto_shash_alg(tfm);
	35	unsigned long alignmask = crypto_shash_alignmask(tfm);
	36	unsigned long absize;
	37	u8 buffer, alignbuffer;
	38	int err;
	39
	40	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	41	buffer = kmalloc(absize, GFP_KERNEL);
	42	if (!buffer)
	43	return -ENOMEM;
	44
	45	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	46	memcpy(alignbuffer, key, keylen);
	47	err = shash->setkey(tfm, alignbuffer, keylen);
8c32c516	48	kzfree(buffer);
7b5a080b HX	49	return err;
	50	}
	51
	52	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	53	unsigned int keylen)
	54	{
	55	struct shash_alg *shash = crypto_shash_alg(tfm);
	56	unsigned long alignmask = crypto_shash_alignmask(tfm);
	57
	58	if ((unsigned long)key & alignmask)
	59	return shash_setkey_unaligned(tfm, key, keylen);
	60
	61	return shash->setkey(tfm, key, keylen);
	62	}
	63	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	64
	65	static inline unsigned int shash_align_buffer_size(unsigned len,
	66	unsigned long mask)
	67	{
	68	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	69	}
	70
	71	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	72	unsigned int len)
	73	{
	74	struct crypto_shash *tfm = desc->tfm;
	75	struct shash_alg *shash = crypto_shash_alg(tfm);
	76	unsigned long alignmask = crypto_shash_alignmask(tfm);
	77	unsigned int unaligned_len = alignmask + 1 -
	78	((unsigned long)data & alignmask);
0e2d3a12	79	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
7b5a080b	80	__attribute__ ((aligned));
0e2d3a12	81	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516	82	int err;
7b5a080b	83
f4f68993 YS	84	if (unaligned_len > len)
	85	unaligned_len = len;
	86
7b5a080b	87	memcpy(buf, data, unaligned_len);
8c32c516 HX	88	err = shash->update(desc, buf, unaligned_len);
8c32c516 HX	89	memset(buf, 0, unaligned_len);
7b5a080b	90
8c32c516	91	return err ?:
7b5a080b HX	92	shash->update(desc, data + unaligned_len, len - unaligned_len);
	93	}
	94
	95	int crypto_shash_update(struct shash_desc desc, const u8 data,
	96	unsigned int len)
	97	{
	98	struct crypto_shash *tfm = desc->tfm;
	99	struct shash_alg *shash = crypto_shash_alg(tfm);
	100	unsigned long alignmask = crypto_shash_alignmask(tfm);
	101
	102	if ((unsigned long)data & alignmask)
	103	return shash_update_unaligned(desc, data, len);
	104
	105	return shash->update(desc, data, len);
	106	}
	107	EXPORT_SYMBOL_GPL(crypto_shash_update);
	108
	109	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	110	{
	111	struct crypto_shash *tfm = desc->tfm;
	112	unsigned long alignmask = crypto_shash_alignmask(tfm);
	113	struct shash_alg *shash = crypto_shash_alg(tfm);
	114	unsigned int ds = crypto_shash_digestsize(tfm);
0e2d3a12	115	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
7b5a080b	116	__attribute__ ((aligned));
0e2d3a12	117	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
7b5a080b HX	118	int err;
	119
	120	err = shash->final(desc, buf);
8c32c516 HX	121	if (err)
	122	goto out;
	123
7b5a080b	124	memcpy(out, buf, ds);
8c32c516 HX	125
	126	out:
	127	memset(buf, 0, ds);
7b5a080b HX	128	return err;
	129	}
	130
	131	int crypto_shash_final(struct shash_desc desc, u8 out)
	132	{
	133	struct crypto_shash *tfm = desc->tfm;
	134	struct shash_alg *shash = crypto_shash_alg(tfm);
	135	unsigned long alignmask = crypto_shash_alignmask(tfm);
	136
	137	if ((unsigned long)out & alignmask)
	138	return shash_final_unaligned(desc, out);
	139
	140	return shash->final(desc, out);
	141	}
	142	EXPORT_SYMBOL_GPL(crypto_shash_final);
	143
	144	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
	145	unsigned int len, u8 *out)
	146	{
	147	return crypto_shash_update(desc, data, len) ?:
	148	crypto_shash_final(desc, out);
	149	}
	150
	151	int crypto_shash_finup(struct shash_desc desc, const u8 data,
	152	unsigned int len, u8 *out)
	153	{
	154	struct crypto_shash *tfm = desc->tfm;
	155	struct shash_alg *shash = crypto_shash_alg(tfm);
	156	unsigned long alignmask = crypto_shash_alignmask(tfm);
	157
8267adab	158	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	159	return shash_finup_unaligned(desc, data, len, out);
	160
	161	return shash->finup(desc, data, len, out);
	162	}
	163	EXPORT_SYMBOL_GPL(crypto_shash_finup);
	164
	165	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
	166	unsigned int len, u8 *out)
	167	{
	168	return crypto_shash_init(desc) ?:
f88ad8de	169	crypto_shash_finup(desc, data, len, out);
7b5a080b HX	170	}
	171
	172	int crypto_shash_digest(struct shash_desc desc, const u8 data,
	173	unsigned int len, u8 *out)
	174	{
	175	struct crypto_shash *tfm = desc->tfm;
	176	struct shash_alg *shash = crypto_shash_alg(tfm);
	177	unsigned long alignmask = crypto_shash_alignmask(tfm);
	178
8267adab	179	if (((unsigned long)data \| (unsigned long)out) & alignmask)
7b5a080b HX	180	return shash_digest_unaligned(desc, data, len, out);
	181
	182	return shash->digest(desc, data, len, out);
	183	}
	184	EXPORT_SYMBOL_GPL(crypto_shash_digest);
	185
f592682f	186	static int shash_default_export(struct shash_desc desc, void out)
dec8b786	187	{
f592682f HX	188	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
f592682f HX	189	return 0;
99d27e1c	190	}
dec8b786	191
f592682f	192	static int shash_default_import(struct shash_desc desc, const void in)
99d27e1c	193	{
f592682f HX	194	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
f592682f HX	195	return 0;
dec8b786	196	}
dec8b786	197
3b2f6df0 HX	198	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	199	unsigned int keylen)
	200	{
	201	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	202
	203	return crypto_shash_setkey(*ctx, key, keylen);
	204	}
	205
	206	static int shash_async_init(struct ahash_request *req)
	207	{
	208	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	209	struct shash_desc *desc = ahash_request_ctx(req);
	210
	211	desc->tfm = *ctx;
	212	desc->flags = req->base.flags;
	213
	214	return crypto_shash_init(desc);
	215	}
	216
7eddf95e	217	int shash_ahash_update(struct ahash_request req, struct shash_desc desc)
3b2f6df0	218	{
3b2f6df0 HX	219	struct crypto_hash_walk walk;
	220	int nbytes;
	221
	222	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	223	nbytes = crypto_hash_walk_done(&walk, nbytes))
	224	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	225
	226	return nbytes;
	227	}
7eddf95e HX	228	EXPORT_SYMBOL_GPL(shash_ahash_update);
	229
	230	static int shash_async_update(struct ahash_request *req)
	231	{
	232	return shash_ahash_update(req, ahash_request_ctx(req));
	233	}
3b2f6df0 HX	234
	235	static int shash_async_final(struct ahash_request *req)
	236	{
	237	return crypto_shash_final(ahash_request_ctx(req), req->result);
	238	}
	239
66f6ce5e HX	240	int shash_ahash_finup(struct ahash_request req, struct shash_desc desc)
	241	{
	242	struct crypto_hash_walk walk;
	243	int nbytes;
	244
cbc86b91 HX	245	nbytes = crypto_hash_walk_first(req, &walk);
	246	if (!nbytes)
	247	return crypto_shash_final(desc, req->result);
	248
	249	do {
66f6ce5e HX	250	nbytes = crypto_hash_walk_last(&walk) ?
	251	crypto_shash_finup(desc, walk.data, nbytes,
	252	req->result) :
	253	crypto_shash_update(desc, walk.data, nbytes);
cbc86b91 HX	254	nbytes = crypto_hash_walk_done(&walk, nbytes);
cbc86b91 HX	255	} while (nbytes > 0);
66f6ce5e HX	256
	257	return nbytes;
	258	}
	259	EXPORT_SYMBOL_GPL(shash_ahash_finup);
	260
	261	static int shash_async_finup(struct ahash_request *req)
	262	{
	263	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	264	struct shash_desc *desc = ahash_request_ctx(req);
	265
	266	desc->tfm = *ctx;
	267	desc->flags = req->base.flags;
	268
	269	return shash_ahash_finup(req, desc);
	270	}
	271
7eddf95e	272	int shash_ahash_digest(struct ahash_request req, struct shash_desc desc)
3b2f6df0 HX	273	{
	274	struct scatterlist *sg = req->src;
	275	unsigned int offset = sg->offset;
	276	unsigned int nbytes = req->nbytes;
	277	int err;
	278
	279	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
3b2f6df0 HX	280	void *data;
3b2f6df0 HX	281
3b2f6df0 HX	282	data = crypto_kmap(sg_page(sg), 0);
	283	err = crypto_shash_digest(desc, data + offset, nbytes,
	284	req->result);
	285	crypto_kunmap(data, 0);
	286	crypto_yield(desc->flags);
7eddf95e HX	287	} else
7eddf95e HX	288	err = crypto_shash_init(desc) ?:
66f6ce5e	289	shash_ahash_finup(req, desc);
3b2f6df0	290
7eddf95e HX	291	return err;
	292	}
	293	EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0	294
7eddf95e HX	295	static int shash_async_digest(struct ahash_request *req)
	296	{
	297	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	298	struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0	299
7eddf95e HX	300	desc->tfm = *ctx;
7eddf95e HX	301	desc->flags = req->base.flags;
3b2f6df0	302
7eddf95e	303	return shash_ahash_digest(req, desc);
3b2f6df0 HX	304	}
3b2f6df0 HX	305
66f6ce5e HX	306	static int shash_async_export(struct ahash_request req, void out)
	307	{
	308	return crypto_shash_export(ahash_request_ctx(req), out);
	309	}
	310
	311	static int shash_async_import(struct ahash_request req, const void in)
	312	{
	313	return crypto_shash_import(ahash_request_ctx(req), in);
	314	}
	315
3b2f6df0 HX	316	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
	317	{
	318	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	319
	320	crypto_free_shash(*ctx);
	321	}
	322
88056ec3	323	int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
3b2f6df0 HX	324	{
3b2f6df0 HX	325	struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e	326	struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3	327	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
3b2f6df0 HX	328	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	329	struct crypto_shash *shash;
	330
	331	if (!crypto_mod_get(calg))
	332	return -EAGAIN;
	333
3f683d61	334	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	335	if (IS_ERR(shash)) {
	336	crypto_mod_put(calg);
	337	return PTR_ERR(shash);
	338	}
	339
	340	*ctx = shash;
	341	tfm->exit = crypto_exit_shash_ops_async;
	342
	343	crt->init = shash_async_init;
	344	crt->update = shash_async_update;
66f6ce5e HX	345	crt->final = shash_async_final;
66f6ce5e HX	346	crt->finup = shash_async_finup;
3b2f6df0	347	crt->digest = shash_async_digest;
66f6ce5e HX	348
	349	if (alg->setkey)
	350	crt->setkey = shash_async_setkey;
	351	if (alg->export)
	352	crt->export = shash_async_export;
0044f3ed	353	if (alg->import)
66f6ce5e	354	crt->import = shash_async_import;
3b2f6df0	355
3b2f6df0 HX	356	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	357
	358	return 0;
	359	}
	360
5f7082ed HX	361	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	362	unsigned int keylen)
	363	{
113adefc HX	364	struct shash_desc **descp = crypto_hash_ctx(tfm);
113adefc HX	365	struct shash_desc desc = descp;
5f7082ed HX	366
	367	return crypto_shash_setkey(desc->tfm, key, keylen);
	368	}
	369
	370	static int shash_compat_init(struct hash_desc *hdesc)
	371	{
113adefc HX	372	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	373	struct shash_desc desc = descp;
5f7082ed HX	374
	375	desc->flags = hdesc->flags;
	376
	377	return crypto_shash_init(desc);
	378	}
	379
	380	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	381	unsigned int len)
	382	{
113adefc HX	383	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	384	struct shash_desc desc = descp;
5f7082ed HX	385	struct crypto_hash_walk walk;
	386	int nbytes;
	387
	388	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	389	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	390	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	391
	392	return nbytes;
	393	}
	394
	395	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	396	{
113adefc HX	397	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	398
	399	return crypto_shash_final(*descp, out);
5f7082ed HX	400	}
	401
	402	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	403	unsigned int nbytes, u8 *out)
	404	{
	405	unsigned int offset = sg->offset;
	406	int err;
	407
	408	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
113adefc HX	409	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
113adefc HX	410	struct shash_desc desc = descp;
5f7082ed HX	411	void *data;
	412
	413	desc->flags = hdesc->flags;
	414
	415	data = crypto_kmap(sg_page(sg), 0);
	416	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	417	crypto_kunmap(data, 0);
	418	crypto_yield(desc->flags);
	419	goto out;
	420	}
	421
	422	err = shash_compat_init(hdesc);
	423	if (err)
	424	goto out;
	425
	426	err = shash_compat_update(hdesc, sg, nbytes);
	427	if (err)
	428	goto out;
	429
	430	err = shash_compat_final(hdesc, out);
	431
	432	out:
	433	return err;
	434	}
	435
	436	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
	437	{
113adefc HX	438	struct shash_desc **descp = crypto_tfm_ctx(tfm);
113adefc HX	439	struct shash_desc desc = descp;
5f7082ed HX	440
5f7082ed HX	441	crypto_free_shash(desc->tfm);
113adefc	442	kzfree(desc);
5f7082ed HX	443	}
	444
	445	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
	446	{
	447	struct hash_tfm *crt = &tfm->crt_hash;
	448	struct crypto_alg *calg = tfm->__crt_alg;
	449	struct shash_alg *alg = __crypto_shash_alg(calg);
113adefc	450	struct shash_desc **descp = crypto_tfm_ctx(tfm);
5f7082ed	451	struct crypto_shash *shash;
113adefc	452	struct shash_desc *desc;
5f7082ed	453
4abfd73e AKR	454	if (!crypto_mod_get(calg))
	455	return -EAGAIN;
	456
3f683d61	457	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	458	if (IS_ERR(shash)) {
4abfd73e AKR	459	crypto_mod_put(calg);
5f7082ed	460	return PTR_ERR(shash);
4abfd73e	461	}
5f7082ed	462
113adefc HX	463	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
	464	GFP_KERNEL);
	465	if (!desc) {
	466	crypto_free_shash(shash);
	467	return -ENOMEM;
	468	}
	469
	470	*descp = desc;
5f7082ed HX	471	desc->tfm = shash;
	472	tfm->exit = crypto_exit_shash_ops_compat;
	473
	474	crt->init = shash_compat_init;
	475	crt->update = shash_compat_update;
	476	crt->final = shash_compat_final;
	477	crt->digest = shash_compat_digest;
	478	crt->setkey = shash_compat_setkey;
	479
	480	crt->digestsize = alg->digestsize;
	481
	482	return 0;
	483	}
	484
3b2f6df0 HX	485	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	486	{
	487	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	488	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	489	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	490	}
	491
	492	return -EINVAL;
	493	}
	494
	495	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	496	u32 mask)
	497	{
	498	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed	499	case CRYPTO_ALG_TYPE_HASH_MASK:
113adefc	500	return sizeof(struct shash_desc *);
3b2f6df0 HX	501	}
	502
	503	return 0;
	504	}
	505
2ca33da1	506	static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b	507	{
113adefc HX	508	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	509
	510	hash->descsize = crypto_shash_alg(hash)->descsize;
7b5a080b HX	511	return 0;
	512	}
	513
2ca33da1	514	static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
7b5a080b HX	515	{
	516	return alg->cra_ctxsize;
	517	}
	518
	519	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	520	__attribute__ ((unused));
	521	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	522	{
	523	struct shash_alg *salg = __crypto_shash_alg(alg);
	524
	525	seq_printf(m, "type : shash\n");
	526	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	527	seq_printf(m, "digestsize : %u\n", salg->digestsize);
7b5a080b HX	528	}
	529
	530	static const struct crypto_type crypto_shash_type = {
3b2f6df0	531	.ctxsize = crypto_shash_ctxsize,
7b5a080b	532	.extsize = crypto_shash_extsize,
3b2f6df0	533	.init = crypto_init_shash_ops,
7b5a080b HX	534	.init_tfm = crypto_shash_init_tfm,
	535	#ifdef CONFIG_PROC_FS
	536	.show = crypto_shash_show,
	537	#endif
	538	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	539	.maskset = CRYPTO_ALG_TYPE_MASK,
	540	.type = CRYPTO_ALG_TYPE_SHASH,
	541	.tfmsize = offsetof(struct crypto_shash, base),
	542	};
	543
	544	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	545	u32 mask)
	546	{
3f683d61	547	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	548	}
	549	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	550
619a6ebd	551	static int shash_prepare_alg(struct shash_alg *alg)
7b5a080b HX	552	{
	553	struct crypto_alg *base = &alg->base;
	554
	555	if (alg->digestsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	556	alg->descsize > PAGE_SIZE / 8 \|\|
99d27e1c HX	557	alg->statesize > PAGE_SIZE / 8)
7b5a080b HX	558	return -EINVAL;
	559
	560	base->cra_type = &crypto_shash_type;
	561	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	562	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
99d27e1c	563
8267adab HX	564	if (!alg->finup)
	565	alg->finup = shash_finup_unaligned;
	566	if (!alg->digest)
	567	alg->digest = shash_digest_unaligned;
f592682f HX	568	if (!alg->export) {
	569	alg->export = shash_default_export;
	570	alg->import = shash_default_import;
	571	alg->statesize = alg->descsize;
	572	}
57cfe44b HX	573	if (!alg->setkey)
57cfe44b HX	574	alg->setkey = shash_no_setkey;
99d27e1c	575
619a6ebd HX	576	return 0;
	577	}
	578
	579	int crypto_register_shash(struct shash_alg *alg)
	580	{
	581	struct crypto_alg *base = &alg->base;
	582	int err;
	583
	584	err = shash_prepare_alg(alg);
	585	if (err)
	586	return err;
7b5a080b HX	587
	588	return crypto_register_alg(base);
	589	}
	590	EXPORT_SYMBOL_GPL(crypto_register_shash);
	591
	592	int crypto_unregister_shash(struct shash_alg *alg)
	593	{
	594	return crypto_unregister_alg(&alg->base);
	595	}
	596	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	597
619a6ebd HX	598	int shash_register_instance(struct crypto_template *tmpl,
	599	struct shash_instance *inst)
	600	{
	601	int err;
	602
	603	err = shash_prepare_alg(&inst->alg);
	604	if (err)
	605	return err;
	606
	607	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
	608	}
	609	EXPORT_SYMBOL_GPL(shash_register_instance);
	610
2e4fddd8 HX	611	void shash_free_instance(struct crypto_instance *inst)
	612	{
	613	crypto_drop_spawn(crypto_instance_ctx(inst));
	614	kfree(shash_instance(inst));
	615	}
	616	EXPORT_SYMBOL_GPL(shash_free_instance);
	617
94296999 HX	618	int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
	619	struct shash_alg *alg,
	620	struct crypto_instance *inst)
	621	{
	622	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
	623	&crypto_shash_type);
	624	}
	625	EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
	626
7d6f5640 HX	627	struct shash_alg shash_attr_alg(struct rtattr rta, u32 type, u32 mask)
	628	{
	629	struct crypto_alg *alg;
	630
	631	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	632	return IS_ERR(alg) ? ERR_CAST(alg) :
	633	container_of(alg, struct shash_alg, base);
	634	}
	635	EXPORT_SYMBOL_GPL(shash_attr_alg);
	636
7b5a080b HX	637	MODULE_LICENSE("GPL");
7b5a080b HX	638	MODULE_DESCRIPTION("Synchronous cryptographic hash type");