[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>

static const struct crypto_type crypto_shash_type;

static inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm)
{
	return container_of(tfm, struct crypto_shash, base);
}

#include "internal.h"

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));

	memcpy(buf, data, unaligned_len);

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

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

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

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

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

	err = shash->final(desc, buf);
	memcpy(out, buf, ds);
	return err;
}

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

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

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

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

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

	if (((unsigned long)data | (unsigned long)out) & alignmask ||
	    !shash->finup)
		return shash_finup_unaligned(desc, data, len, out);

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

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

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

	if (((unsigned long)data | (unsigned long)out) & alignmask ||
	    !shash->digest)
		return shash_digest_unaligned(desc, data, len, out);

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

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

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

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

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_import);

static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
			      unsigned int keylen)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);

	return crypto_shash_setkey(*ctx, key, keylen);
}

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

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

	return crypto_shash_init(desc);
}

static int shash_async_update(struct ahash_request *req)
{
	struct shash_desc *desc = ahash_request_ctx(req);
	struct crypto_hash_walk walk;
	int nbytes;

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

	return nbytes;
}

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

static int shash_async_digest(struct ahash_request *req)
{
	struct scatterlist *sg = req->src;
	unsigned int offset = sg->offset;
	unsigned int nbytes = req->nbytes;
	int err;

	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
		struct crypto_shash **ctx =
			crypto_ahash_ctx(crypto_ahash_reqtfm(req));
		struct shash_desc *desc = ahash_request_ctx(req);
		void *data;

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

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

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

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

	err = shash_async_final(req);

out:
	return err;
}

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

	crypto_free_shash(*ctx);
}

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

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

	shash = __crypto_shash_cast(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;

	shash = __crypto_shash_cast(crypto_create_tfm(
		calg, &crypto_shash_type));
	if (IS_ERR(shash))
		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)
{
	if (frontend->type != CRYPTO_ALG_TYPE_SHASH)
		return -EINVAL;
	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_shash_cast(
		crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask));
}
EXPORT_SYMBOL_GPL(crypto_alloc_shash);

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

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

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

	return 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);

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	static const struct crypto_type crypto_shash_type;
3b2f6df0 HX	22
7b5a080b HX	23	static inline struct crypto_shash __crypto_shash_cast(struct crypto_tfm tfm)
	24	{
	25	return container_of(tfm, struct crypto_shash, base);
	26	}
	27
3b2f6df0 HX	28	#include "internal.h"
3b2f6df0 HX	29
7b5a080b HX	30	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	31	unsigned int keylen)
	32	{
	33	struct shash_alg *shash = crypto_shash_alg(tfm);
	34	unsigned long alignmask = crypto_shash_alignmask(tfm);
	35	unsigned long absize;
	36	u8 buffer, alignbuffer;
	37	int err;
	38
	39	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	40	buffer = kmalloc(absize, GFP_KERNEL);
	41	if (!buffer)
	42	return -ENOMEM;
	43
	44	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	45	memcpy(alignbuffer, key, keylen);
	46	err = shash->setkey(tfm, alignbuffer, keylen);
	47	memset(alignbuffer, 0, keylen);
	48	kfree(buffer);
	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
3751f402 HX	58	if (!shash->setkey)
	59	return -ENOSYS;
	60
7b5a080b HX	61	if ((unsigned long)key & alignmask)
	62	return shash_setkey_unaligned(tfm, key, keylen);
	63
	64	return shash->setkey(tfm, key, keylen);
	65	}
	66	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	67
	68	static inline unsigned int shash_align_buffer_size(unsigned len,
	69	unsigned long mask)
	70	{
	71	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	72	}
	73
	74	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	75	unsigned int len)
	76	{
	77	struct crypto_shash *tfm = desc->tfm;
	78	struct shash_alg *shash = crypto_shash_alg(tfm);
	79	unsigned long alignmask = crypto_shash_alignmask(tfm);
	80	unsigned int unaligned_len = alignmask + 1 -
	81	((unsigned long)data & alignmask);
	82	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
	83	__attribute__ ((aligned));
	84
	85	memcpy(buf, data, unaligned_len);
	86
	87	return shash->update(desc, buf, unaligned_len) ?:
	88	shash->update(desc, data + unaligned_len, len - unaligned_len);
	89	}
	90
	91	int crypto_shash_update(struct shash_desc desc, const u8 data,
	92	unsigned int len)
	93	{
	94	struct crypto_shash *tfm = desc->tfm;
	95	struct shash_alg *shash = crypto_shash_alg(tfm);
	96	unsigned long alignmask = crypto_shash_alignmask(tfm);
	97
	98	if ((unsigned long)data & alignmask)
	99	return shash_update_unaligned(desc, data, len);
	100
	101	return shash->update(desc, data, len);
	102	}
	103	EXPORT_SYMBOL_GPL(crypto_shash_update);
	104
	105	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	106	{
	107	struct crypto_shash *tfm = desc->tfm;
	108	unsigned long alignmask = crypto_shash_alignmask(tfm);
	109	struct shash_alg *shash = crypto_shash_alg(tfm);
	110	unsigned int ds = crypto_shash_digestsize(tfm);
	111	u8 buf[shash_align_buffer_size(ds, alignmask)]
	112	__attribute__ ((aligned));
	113	int err;
	114
	115	err = shash->final(desc, buf);
	116	memcpy(out, buf, ds);
	117	return err;
	118	}
	119
	120	int crypto_shash_final(struct shash_desc desc, u8 out)
	121	{
	122	struct crypto_shash *tfm = desc->tfm;
	123	struct shash_alg *shash = crypto_shash_alg(tfm);
	124	unsigned long alignmask = crypto_shash_alignmask(tfm);
125
126	if ((unsigned long)out & alignmask)
127	return shash_final_unaligned(desc, out);
128
129	return shash->final(desc, out);
130	}
131	EXPORT_SYMBOL_GPL(crypto_shash_final);
132
133	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
134	unsigned int len, u8 *out)
135	{
136	return crypto_shash_update(desc, data, len) ?:
137	crypto_shash_final(desc, out);
138	}
139
140	int crypto_shash_finup(struct shash_desc desc, const u8 data,
141	unsigned int len, u8 *out)
142	{
143	struct crypto_shash *tfm = desc->tfm;
144	struct shash_alg *shash = crypto_shash_alg(tfm);
145	unsigned long alignmask = crypto_shash_alignmask(tfm);
146
147	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
148	!shash->finup)
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) ?:
159	crypto_shash_update(desc, data, len) ?:
160	crypto_shash_final(desc, out);
161	}
162
163	int crypto_shash_digest(struct shash_desc desc, const u8 data,
164	unsigned int len, u8 *out)
165	{
166	struct crypto_shash *tfm = desc->tfm;
167	struct shash_alg *shash = crypto_shash_alg(tfm);
168	unsigned long alignmask = crypto_shash_alignmask(tfm);
169
170	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
171	!shash->digest)
172	return shash_digest_unaligned(desc, data, len, out);
173
174	return shash->digest(desc, data, len, out);
175	}
176	EXPORT_SYMBOL_GPL(crypto_shash_digest);
177
dec8b786 HX	178	int crypto_shash_import(struct shash_desc desc, const u8 in)
	179	{
	180	struct crypto_shash *tfm = desc->tfm;
	181	struct shash_alg *alg = crypto_shash_alg(tfm);
	182
	183	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
	184
	185	if (alg->reinit)
	186	alg->reinit(desc);
	187
	188	return 0;
	189	}
	190	EXPORT_SYMBOL_GPL(crypto_shash_import);
	191
3b2f6df0 HX	192	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	193	unsigned int keylen)
	194	{
	195	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	196
	197	return crypto_shash_setkey(*ctx, key, keylen);
	198	}
	199
	200	static int shash_async_init(struct ahash_request *req)
	201	{
	202	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	203	struct shash_desc *desc = ahash_request_ctx(req);
	204
	205	desc->tfm = *ctx;
	206	desc->flags = req->base.flags;
	207
	208	return crypto_shash_init(desc);
	209	}
	210
	211	static int shash_async_update(struct ahash_request *req)
	212	{
	213	struct shash_desc *desc = ahash_request_ctx(req);
	214	struct crypto_hash_walk walk;
	215	int nbytes;
	216
	217	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	218	nbytes = crypto_hash_walk_done(&walk, nbytes))
	219	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	220
	221	return nbytes;
	222	}
	223
	224	static int shash_async_final(struct ahash_request *req)
	225	{
	226	return crypto_shash_final(ahash_request_ctx(req), req->result);
	227	}
	228
	229	static int shash_async_digest(struct ahash_request *req)
	230	{
	231	struct scatterlist *sg = req->src;
	232	unsigned int offset = sg->offset;
	233	unsigned int nbytes = req->nbytes;
	234	int err;
	235
	236	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	237	struct crypto_shash **ctx =
	238	crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	239	struct shash_desc *desc = ahash_request_ctx(req);
	240	void *data;
	241
	242	desc->tfm = *ctx;
	243	desc->flags = req->base.flags;
	244
	245	data = crypto_kmap(sg_page(sg), 0);
	246	err = crypto_shash_digest(desc, data + offset, nbytes,
	247	req->result);
	248	crypto_kunmap(data, 0);
	249	crypto_yield(desc->flags);
	250	goto out;
	251	}
	252
	253	err = shash_async_init(req);
	254	if (err)
	255	goto out;
256
257	err = shash_async_update(req);
258	if (err)
259	goto out;
260
261	err = shash_async_final(req);
262
263	out:
264	return err;
265	}
266
267	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
268	{
269	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
270
271	crypto_free_shash(*ctx);
272	}
273
274	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
275	{
276	struct crypto_alg *calg = tfm->__crt_alg;
277	struct shash_alg *alg = __crypto_shash_alg(calg);
278	struct ahash_tfm *crt = &tfm->crt_ahash;
279	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
280	struct crypto_shash *shash;
281
282	if (!crypto_mod_get(calg))
283	return -EAGAIN;
284
285	shash = __crypto_shash_cast(crypto_create_tfm(
286	calg, &crypto_shash_type));
287	if (IS_ERR(shash)) {
288	crypto_mod_put(calg);
289	return PTR_ERR(shash);
290	}
291
292	*ctx = shash;
293	tfm->exit = crypto_exit_shash_ops_async;
294
295	crt->init = shash_async_init;
296	crt->update = shash_async_update;
297	crt->final = shash_async_final;
298	crt->digest = shash_async_digest;
299	crt->setkey = shash_async_setkey;
300
301	crt->digestsize = alg->digestsize;
302	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
303
304	return 0;
305	}
306
5f7082ed HX	307	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	308	unsigned int keylen)
	309	{
	310	struct shash_desc *desc = crypto_hash_ctx(tfm);
	311
	312	return crypto_shash_setkey(desc->tfm, key, keylen);
	313	}
	314
	315	static int shash_compat_init(struct hash_desc *hdesc)
	316	{
	317	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	318
	319	desc->flags = hdesc->flags;
	320
	321	return crypto_shash_init(desc);
	322	}
	323
	324	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	325	unsigned int len)
	326	{
	327	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	328	struct crypto_hash_walk walk;
	329	int nbytes;
	330
	331	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	332	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	333	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	334
	335	return nbytes;
	336	}
	337
	338	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	339	{
	340	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
	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)) {
	350	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	351	void *data;
	352
	353	desc->flags = hdesc->flags;
	354
	355	data = crypto_kmap(sg_page(sg), 0);
	356	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	357	crypto_kunmap(data, 0);
	358	crypto_yield(desc->flags);
	359	goto out;
	360	}
	361
	362	err = shash_compat_init(hdesc);
	363	if (err)
	364	goto out;
	365
	366	err = shash_compat_update(hdesc, sg, nbytes);
	367	if (err)
	368	goto out;
	369
	370	err = shash_compat_final(hdesc, out);
371
372	out:
373	return err;
374	}
375
376	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
377	{
378	struct shash_desc *desc= crypto_tfm_ctx(tfm);
379
380	crypto_free_shash(desc->tfm);
381	}
382
383	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
384	{
385	struct hash_tfm *crt = &tfm->crt_hash;
386	struct crypto_alg *calg = tfm->__crt_alg;
387	struct shash_alg *alg = __crypto_shash_alg(calg);
388	struct shash_desc *desc = crypto_tfm_ctx(tfm);
389	struct crypto_shash *shash;
390
391	shash = __crypto_shash_cast(crypto_create_tfm(
392	calg, &crypto_shash_type));
393	if (IS_ERR(shash))
394	return PTR_ERR(shash);
395
396	desc->tfm = shash;
397	tfm->exit = crypto_exit_shash_ops_compat;
398
399	crt->init = shash_compat_init;
400	crt->update = shash_compat_update;
401	crt->final = shash_compat_final;
402	crt->digest = shash_compat_digest;
403	crt->setkey = shash_compat_setkey;
404
405	crt->digestsize = alg->digestsize;
406
407	return 0;
408	}
409
3b2f6df0 HX	410	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	411	{
	412	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	413	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	414	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	415	case CRYPTO_ALG_TYPE_AHASH_MASK:
	416	return crypto_init_shash_ops_async(tfm);
	417	}
	418
	419	return -EINVAL;
	420	}
	421
	422	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	423	u32 mask)
	424	{
5f7082ed HX	425	struct shash_alg *salg = __crypto_shash_alg(alg);
5f7082ed HX	426
3b2f6df0	427	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	428	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	429	return sizeof(struct shash_desc) + salg->descsize;
3b2f6df0 HX	430	case CRYPTO_ALG_TYPE_AHASH_MASK:
	431	return sizeof(struct crypto_shash *);
	432	}
	433
	434	return 0;
	435	}
	436
7b5a080b HX	437	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
	438	const struct crypto_type *frontend)
	439	{
	440	if (frontend->type != CRYPTO_ALG_TYPE_SHASH)
	441	return -EINVAL;
	442	return 0;
	443	}
	444
	445	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
	446	const struct crypto_type *frontend)
	447	{
	448	return alg->cra_ctxsize;
	449	}
	450
	451	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	452	__attribute__ ((unused));
	453	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	454	{
	455	struct shash_alg *salg = __crypto_shash_alg(alg);
	456
	457	seq_printf(m, "type : shash\n");
	458	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	459	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	460	seq_printf(m, "descsize : %u\n", salg->descsize);
	461	}
	462
	463	static const struct crypto_type crypto_shash_type = {
3b2f6df0	464	.ctxsize = crypto_shash_ctxsize,
7b5a080b	465	.extsize = crypto_shash_extsize,
3b2f6df0	466	.init = crypto_init_shash_ops,
7b5a080b HX	467	.init_tfm = crypto_shash_init_tfm,
	468	#ifdef CONFIG_PROC_FS
	469	.show = crypto_shash_show,
	470	#endif
	471	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	472	.maskset = CRYPTO_ALG_TYPE_MASK,
	473	.type = CRYPTO_ALG_TYPE_SHASH,
	474	.tfmsize = offsetof(struct crypto_shash, base),
	475	};
	476
	477	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	478	u32 mask)
	479	{
	480	return __crypto_shash_cast(
	481	crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask));
	482	}
	483	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	484
	485	int crypto_register_shash(struct shash_alg *alg)
	486	{
	487	struct crypto_alg *base = &alg->base;
	488
	489	if (alg->digestsize > PAGE_SIZE / 8 \|\|
	490	alg->descsize > PAGE_SIZE / 8)
	491	return -EINVAL;
	492
	493	base->cra_type = &crypto_shash_type;
	494	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	495	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
	496
	497	return crypto_register_alg(base);
	498	}
	499	EXPORT_SYMBOL_GPL(crypto_register_shash);
	500
	501	int crypto_unregister_shash(struct shash_alg *alg)
	502	{
	503	return crypto_unregister_alg(&alg->base);
	504	}
	505	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	506
	507	MODULE_LICENSE("GPL");
	508	MODULE_DESCRIPTION("Synchronous cryptographic hash type");