[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_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_create_tfm(calg, &crypto_shash_type);
	if (IS_ERR(shash)) {
		crypto_mod_put(calg);
		return PTR_ERR(shash);
	}

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

	crt->init = shash_async_init;
	crt->update = shash_async_update;
	crt->final  = shash_async_final;
	crt->digest = shash_async_digest;
	crt->setkey = shash_async_setkey;

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

	return 0;
}

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

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

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

	desc->flags = hdesc->flags;

	return crypto_shash_init(desc);
}

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

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

	return nbytes;
}

static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
{
	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
}

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

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

		desc->flags = hdesc->flags;

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

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

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

	err = shash_compat_final(hdesc, out);

out:
	return err;
}

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

	crypto_free_shash(desc->tfm);
}

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

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

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

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

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

	crt->digestsize = alg->digestsize;

	return 0;
}

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

	return -EINVAL;
}

static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
					 u32 mask)
{
	struct shash_alg *salg = __crypto_shash_alg(alg);

	switch (mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_HASH_MASK:
		return sizeof(struct shash_desc) + salg->descsize;
	case CRYPTO_ALG_TYPE_AHASH_MASK:
		return sizeof(struct crypto_shash *);
	}

	return 0;
}

static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
				 const struct crypto_type *frontend)
{
	return 0;
}

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

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

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

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

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

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	#include "internal.h"
3b2f6df0 HX	22
3f683d61 HX	23	static const struct crypto_type crypto_shash_type;
3f683d61 HX	24
7b5a080b HX	25	static int shash_setkey_unaligned(struct crypto_shash tfm, const u8 key,
	26	unsigned int keylen)
	27	{
	28	struct shash_alg *shash = crypto_shash_alg(tfm);
	29	unsigned long alignmask = crypto_shash_alignmask(tfm);
	30	unsigned long absize;
	31	u8 buffer, alignbuffer;
	32	int err;
	33
	34	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
	35	buffer = kmalloc(absize, GFP_KERNEL);
	36	if (!buffer)
	37	return -ENOMEM;
	38
	39	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	40	memcpy(alignbuffer, key, keylen);
	41	err = shash->setkey(tfm, alignbuffer, keylen);
	42	memset(alignbuffer, 0, keylen);
	43	kfree(buffer);
	44	return err;
	45	}
	46
	47	int crypto_shash_setkey(struct crypto_shash tfm, const u8 key,
	48	unsigned int keylen)
	49	{
	50	struct shash_alg *shash = crypto_shash_alg(tfm);
	51	unsigned long alignmask = crypto_shash_alignmask(tfm);
	52
3751f402 HX	53	if (!shash->setkey)
	54	return -ENOSYS;
	55
7b5a080b HX	56	if ((unsigned long)key & alignmask)
	57	return shash_setkey_unaligned(tfm, key, keylen);
	58
	59	return shash->setkey(tfm, key, keylen);
	60	}
	61	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	62
	63	static inline unsigned int shash_align_buffer_size(unsigned len,
	64	unsigned long mask)
	65	{
	66	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	67	}
	68
	69	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
	70	unsigned int len)
	71	{
	72	struct crypto_shash *tfm = desc->tfm;
	73	struct shash_alg *shash = crypto_shash_alg(tfm);
	74	unsigned long alignmask = crypto_shash_alignmask(tfm);
	75	unsigned int unaligned_len = alignmask + 1 -
	76	((unsigned long)data & alignmask);
	77	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
	78	__attribute__ ((aligned));
	79
	80	memcpy(buf, data, unaligned_len);
	81
	82	return shash->update(desc, buf, unaligned_len) ?:
	83	shash->update(desc, data + unaligned_len, len - unaligned_len);
	84	}
	85
	86	int crypto_shash_update(struct shash_desc desc, const u8 data,
	87	unsigned int len)
	88	{
	89	struct crypto_shash *tfm = desc->tfm;
	90	struct shash_alg *shash = crypto_shash_alg(tfm);
	91	unsigned long alignmask = crypto_shash_alignmask(tfm);
	92
	93	if ((unsigned long)data & alignmask)
	94	return shash_update_unaligned(desc, data, len);
	95
	96	return shash->update(desc, data, len);
	97	}
	98	EXPORT_SYMBOL_GPL(crypto_shash_update);
	99
	100	static int shash_final_unaligned(struct shash_desc desc, u8 out)
	101	{
	102	struct crypto_shash *tfm = desc->tfm;
	103	unsigned long alignmask = crypto_shash_alignmask(tfm);
	104	struct shash_alg *shash = crypto_shash_alg(tfm);
	105	unsigned int ds = crypto_shash_digestsize(tfm);
	106	u8 buf[shash_align_buffer_size(ds, alignmask)]
	107	__attribute__ ((aligned));
	108	int err;
	109
	110	err = shash->final(desc, buf);
	111	memcpy(out, buf, ds);
	112	return err;
	113	}
	114
	115	int crypto_shash_final(struct shash_desc desc, u8 out)
	116	{
	117	struct crypto_shash *tfm = desc->tfm;
	118	struct shash_alg *shash = crypto_shash_alg(tfm);
	119	unsigned long alignmask = crypto_shash_alignmask(tfm);
120
121	if ((unsigned long)out & alignmask)
122	return shash_final_unaligned(desc, out);
123
124	return shash->final(desc, out);
125	}
126	EXPORT_SYMBOL_GPL(crypto_shash_final);
127
128	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
129	unsigned int len, u8 *out)
130	{
131	return crypto_shash_update(desc, data, len) ?:
132	crypto_shash_final(desc, out);
133	}
134
135	int crypto_shash_finup(struct shash_desc desc, const u8 data,
136	unsigned int len, u8 *out)
137	{
138	struct crypto_shash *tfm = desc->tfm;
139	struct shash_alg *shash = crypto_shash_alg(tfm);
140	unsigned long alignmask = crypto_shash_alignmask(tfm);
141
142	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
143	!shash->finup)
144	return shash_finup_unaligned(desc, data, len, out);
145
146	return shash->finup(desc, data, len, out);
147	}
148	EXPORT_SYMBOL_GPL(crypto_shash_finup);
149
150	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
151	unsigned int len, u8 *out)
152	{
153	return crypto_shash_init(desc) ?:
154	crypto_shash_update(desc, data, len) ?:
155	crypto_shash_final(desc, out);
156	}
157
158	int crypto_shash_digest(struct shash_desc desc, const u8 data,
159	unsigned int len, u8 *out)
160	{
161	struct crypto_shash *tfm = desc->tfm;
162	struct shash_alg *shash = crypto_shash_alg(tfm);
163	unsigned long alignmask = crypto_shash_alignmask(tfm);
164
165	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
166	!shash->digest)
167	return shash_digest_unaligned(desc, data, len, out);
168
169	return shash->digest(desc, data, len, out);
170	}
171	EXPORT_SYMBOL_GPL(crypto_shash_digest);
172
dec8b786 HX	173	int crypto_shash_import(struct shash_desc desc, const u8 in)
	174	{
	175	struct crypto_shash *tfm = desc->tfm;
	176	struct shash_alg *alg = crypto_shash_alg(tfm);
	177
	178	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
	179
	180	if (alg->reinit)
	181	alg->reinit(desc);
	182
	183	return 0;
	184	}
	185	EXPORT_SYMBOL_GPL(crypto_shash_import);
	186
3b2f6df0 HX	187	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	188	unsigned int keylen)
	189	{
	190	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	191
	192	return crypto_shash_setkey(*ctx, key, keylen);
	193	}
	194
	195	static int shash_async_init(struct ahash_request *req)
	196	{
	197	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	198	struct shash_desc *desc = ahash_request_ctx(req);
	199
	200	desc->tfm = *ctx;
	201	desc->flags = req->base.flags;
	202
	203	return crypto_shash_init(desc);
	204	}
	205
	206	static int shash_async_update(struct ahash_request *req)
	207	{
	208	struct shash_desc *desc = ahash_request_ctx(req);
	209	struct crypto_hash_walk walk;
	210	int nbytes;
	211
	212	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	213	nbytes = crypto_hash_walk_done(&walk, nbytes))
	214	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	215
	216	return nbytes;
	217	}
	218
	219	static int shash_async_final(struct ahash_request *req)
	220	{
	221	return crypto_shash_final(ahash_request_ctx(req), req->result);
	222	}
	223
	224	static int shash_async_digest(struct ahash_request *req)
	225	{
	226	struct scatterlist *sg = req->src;
	227	unsigned int offset = sg->offset;
	228	unsigned int nbytes = req->nbytes;
	229	int err;
	230
	231	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	232	struct crypto_shash **ctx =
	233	crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	234	struct shash_desc *desc = ahash_request_ctx(req);
	235	void *data;
	236
	237	desc->tfm = *ctx;
	238	desc->flags = req->base.flags;
	239
	240	data = crypto_kmap(sg_page(sg), 0);
	241	err = crypto_shash_digest(desc, data + offset, nbytes,
	242	req->result);
	243	crypto_kunmap(data, 0);
	244	crypto_yield(desc->flags);
	245	goto out;
	246	}
	247
	248	err = shash_async_init(req);
	249	if (err)
	250	goto out;
251
252	err = shash_async_update(req);
253	if (err)
254	goto out;
255
256	err = shash_async_final(req);
257
258	out:
259	return err;
260	}
261
262	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
263	{
264	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
265
266	crypto_free_shash(*ctx);
267	}
268
269	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
270	{
271	struct crypto_alg *calg = tfm->__crt_alg;
272	struct shash_alg *alg = __crypto_shash_alg(calg);
273	struct ahash_tfm *crt = &tfm->crt_ahash;
274	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
275	struct crypto_shash *shash;
276
277	if (!crypto_mod_get(calg))
278	return -EAGAIN;
279
3f683d61	280	shash = crypto_create_tfm(calg, &crypto_shash_type);
3b2f6df0 HX	281	if (IS_ERR(shash)) {
	282	crypto_mod_put(calg);
	283	return PTR_ERR(shash);
	284	}
	285
	286	*ctx = shash;
	287	tfm->exit = crypto_exit_shash_ops_async;
	288
	289	crt->init = shash_async_init;
	290	crt->update = shash_async_update;
	291	crt->final = shash_async_final;
	292	crt->digest = shash_async_digest;
	293	crt->setkey = shash_async_setkey;
	294
	295	crt->digestsize = alg->digestsize;
	296	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
	297
	298	return 0;
	299	}
	300
5f7082ed HX	301	static int shash_compat_setkey(struct crypto_hash tfm, const u8 key,
	302	unsigned int keylen)
	303	{
	304	struct shash_desc *desc = crypto_hash_ctx(tfm);
	305
	306	return crypto_shash_setkey(desc->tfm, key, keylen);
	307	}
	308
	309	static int shash_compat_init(struct hash_desc *hdesc)
	310	{
	311	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	312
	313	desc->flags = hdesc->flags;
	314
	315	return crypto_shash_init(desc);
	316	}
	317
	318	static int shash_compat_update(struct hash_desc hdesc, struct scatterlist sg,
	319	unsigned int len)
	320	{
	321	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	322	struct crypto_hash_walk walk;
	323	int nbytes;
	324
	325	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	326	nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
	327	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	328
	329	return nbytes;
	330	}
	331
	332	static int shash_compat_final(struct hash_desc hdesc, u8 out)
	333	{
	334	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
	335	}
	336
	337	static int shash_compat_digest(struct hash_desc hdesc, struct scatterlist sg,
	338	unsigned int nbytes, u8 *out)
	339	{
	340	unsigned int offset = sg->offset;
	341	int err;
	342
	343	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	344	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
	345	void *data;
	346
	347	desc->flags = hdesc->flags;
	348
	349	data = crypto_kmap(sg_page(sg), 0);
	350	err = crypto_shash_digest(desc, data + offset, nbytes, out);
	351	crypto_kunmap(data, 0);
	352	crypto_yield(desc->flags);
	353	goto out;
	354	}
	355
	356	err = shash_compat_init(hdesc);
	357	if (err)
	358	goto out;
	359
	360	err = shash_compat_update(hdesc, sg, nbytes);
	361	if (err)
	362	goto out;
	363
	364	err = shash_compat_final(hdesc, out);
365
366	out:
367	return err;
368	}
369
370	static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
371	{
372	struct shash_desc *desc= crypto_tfm_ctx(tfm);
373
374	crypto_free_shash(desc->tfm);
375	}
376
377	static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
378	{
379	struct hash_tfm *crt = &tfm->crt_hash;
380	struct crypto_alg *calg = tfm->__crt_alg;
381	struct shash_alg *alg = __crypto_shash_alg(calg);
382	struct shash_desc *desc = crypto_tfm_ctx(tfm);
383	struct crypto_shash *shash;
384
4abfd73e AKR	385	if (!crypto_mod_get(calg))
	386	return -EAGAIN;
	387
3f683d61	388	shash = crypto_create_tfm(calg, &crypto_shash_type);
4abfd73e AKR	389	if (IS_ERR(shash)) {
4abfd73e AKR	390	crypto_mod_put(calg);
5f7082ed	391	return PTR_ERR(shash);
4abfd73e	392	}
5f7082ed HX	393
	394	desc->tfm = shash;
	395	tfm->exit = crypto_exit_shash_ops_compat;
	396
	397	crt->init = shash_compat_init;
	398	crt->update = shash_compat_update;
	399	crt->final = shash_compat_final;
	400	crt->digest = shash_compat_digest;
	401	crt->setkey = shash_compat_setkey;
	402
	403	crt->digestsize = alg->digestsize;
	404
	405	return 0;
	406	}
	407
3b2f6df0 HX	408	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	409	{
	410	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	411	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	412	return crypto_init_shash_ops_compat(tfm);
3b2f6df0 HX	413	case CRYPTO_ALG_TYPE_AHASH_MASK:
	414	return crypto_init_shash_ops_async(tfm);
	415	}
	416
	417	return -EINVAL;
	418	}
	419
	420	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
	421	u32 mask)
	422	{
5f7082ed HX	423	struct shash_alg *salg = __crypto_shash_alg(alg);
5f7082ed HX	424
3b2f6df0	425	switch (mask & CRYPTO_ALG_TYPE_MASK) {
5f7082ed HX	426	case CRYPTO_ALG_TYPE_HASH_MASK:
5f7082ed HX	427	return sizeof(struct shash_desc) + salg->descsize;
3b2f6df0 HX	428	case CRYPTO_ALG_TYPE_AHASH_MASK:
	429	return sizeof(struct crypto_shash *);
	430	}
	431
	432	return 0;
	433	}
	434
7b5a080b HX	435	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
	436	const struct crypto_type *frontend)
	437	{
7b5a080b HX	438	return 0;
	439	}
	440
	441	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
	442	const struct crypto_type *frontend)
	443	{
	444	return alg->cra_ctxsize;
	445	}
	446
	447	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	448	__attribute__ ((unused));
	449	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	450	{
	451	struct shash_alg *salg = __crypto_shash_alg(alg);
	452
	453	seq_printf(m, "type : shash\n");
	454	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	455	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	456	seq_printf(m, "descsize : %u\n", salg->descsize);
	457	}
	458
	459	static const struct crypto_type crypto_shash_type = {
3b2f6df0	460	.ctxsize = crypto_shash_ctxsize,
7b5a080b	461	.extsize = crypto_shash_extsize,
3b2f6df0	462	.init = crypto_init_shash_ops,
7b5a080b HX	463	.init_tfm = crypto_shash_init_tfm,
	464	#ifdef CONFIG_PROC_FS
	465	.show = crypto_shash_show,
	466	#endif
	467	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	468	.maskset = CRYPTO_ALG_TYPE_MASK,
	469	.type = CRYPTO_ALG_TYPE_SHASH,
	470	.tfmsize = offsetof(struct crypto_shash, base),
	471	};
	472
	473	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	474	u32 mask)
	475	{
3f683d61	476	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
7b5a080b HX	477	}
	478	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	479
	480	int crypto_register_shash(struct shash_alg *alg)
	481	{
	482	struct crypto_alg *base = &alg->base;
	483
	484	if (alg->digestsize > PAGE_SIZE / 8 \|\|
	485	alg->descsize > PAGE_SIZE / 8)
	486	return -EINVAL;
	487
	488	base->cra_type = &crypto_shash_type;
	489	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	490	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
	491
	492	return crypto_register_alg(base);
	493	}
	494	EXPORT_SYMBOL_GPL(crypto_register_shash);
	495
	496	int crypto_unregister_shash(struct shash_alg *alg)
	497	{
	498	return crypto_unregister_alg(&alg->base);
	499	}
	500	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	501
	502	MODULE_LICENSE("GPL");
	503	MODULE_DESCRIPTION("Synchronous cryptographic hash type");