[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 ((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);

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

	return -EINVAL;
}

static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
					 u32 mask)
{
	switch (mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_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
	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);
	79	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
	80	__attribute__ ((aligned));
	81
	82	memcpy(buf, data, unaligned_len);
	83
	84	return shash->update(desc, buf, unaligned_len) ?:
	85	shash->update(desc, data + unaligned_len, len - unaligned_len);
	86	}
	87
	88	int crypto_shash_update(struct shash_desc desc, const u8 data,
	89	unsigned int len)
	90	{
	91	struct crypto_shash *tfm = desc->tfm;
	92	struct shash_alg *shash = crypto_shash_alg(tfm);
	93	unsigned long alignmask = crypto_shash_alignmask(tfm);
94
95	if ((unsigned long)data & alignmask)
96	return shash_update_unaligned(desc, data, len);
97
98	return shash->update(desc, data, len);
99	}
100	EXPORT_SYMBOL_GPL(crypto_shash_update);
101
102	static int shash_final_unaligned(struct shash_desc desc, u8 out)
103	{
104	struct crypto_shash *tfm = desc->tfm;
105	unsigned long alignmask = crypto_shash_alignmask(tfm);
106	struct shash_alg *shash = crypto_shash_alg(tfm);
107	unsigned int ds = crypto_shash_digestsize(tfm);
108	u8 buf[shash_align_buffer_size(ds, alignmask)]
109	__attribute__ ((aligned));
110	int err;
111
112	err = shash->final(desc, buf);
113	memcpy(out, buf, ds);
114	return err;
115	}
116
117	int crypto_shash_final(struct shash_desc desc, u8 out)
118	{
119	struct crypto_shash *tfm = desc->tfm;
120	struct shash_alg *shash = crypto_shash_alg(tfm);
121	unsigned long alignmask = crypto_shash_alignmask(tfm);
122
123	if ((unsigned long)out & alignmask)
124	return shash_final_unaligned(desc, out);
125
126	return shash->final(desc, out);
127	}
128	EXPORT_SYMBOL_GPL(crypto_shash_final);
129
130	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
131	unsigned int len, u8 *out)
132	{
133	return crypto_shash_update(desc, data, len) ?:
134	crypto_shash_final(desc, out);
135	}
136
137	int crypto_shash_finup(struct shash_desc desc, const u8 data,
138	unsigned int len, u8 *out)
139	{
140	struct crypto_shash *tfm = desc->tfm;
141	struct shash_alg *shash = crypto_shash_alg(tfm);
142	unsigned long alignmask = crypto_shash_alignmask(tfm);
143
144	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
145	!shash->finup)
146	return shash_finup_unaligned(desc, data, len, out);
147
148	return shash->finup(desc, data, len, out);
149	}
150	EXPORT_SYMBOL_GPL(crypto_shash_finup);
151
152	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
153	unsigned int len, u8 *out)
154	{
155	return crypto_shash_init(desc) ?:
156	crypto_shash_update(desc, data, len) ?:
157	crypto_shash_final(desc, out);
158	}
159
160	int crypto_shash_digest(struct shash_desc desc, const u8 data,
161	unsigned int len, u8 *out)
162	{
163	struct crypto_shash *tfm = desc->tfm;
164	struct shash_alg *shash = crypto_shash_alg(tfm);
165	unsigned long alignmask = crypto_shash_alignmask(tfm);
166
167	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
168	!shash->digest)
169	return shash_digest_unaligned(desc, data, len, out);
170
171	return shash->digest(desc, data, len, out);
172	}
173	EXPORT_SYMBOL_GPL(crypto_shash_digest);
174
3b2f6df0 HX	175	static int shash_async_setkey(struct crypto_ahash tfm, const u8 key,
	176	unsigned int keylen)
	177	{
	178	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
	179
	180	return crypto_shash_setkey(*ctx, key, keylen);
	181	}
	182
	183	static int shash_async_init(struct ahash_request *req)
	184	{
	185	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	186	struct shash_desc *desc = ahash_request_ctx(req);
	187
	188	desc->tfm = *ctx;
	189	desc->flags = req->base.flags;
	190
	191	return crypto_shash_init(desc);
	192	}
	193
	194	static int shash_async_update(struct ahash_request *req)
	195	{
	196	struct shash_desc *desc = ahash_request_ctx(req);
	197	struct crypto_hash_walk walk;
	198	int nbytes;
	199
	200	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	201	nbytes = crypto_hash_walk_done(&walk, nbytes))
	202	nbytes = crypto_shash_update(desc, walk.data, nbytes);
	203
	204	return nbytes;
	205	}
	206
	207	static int shash_async_final(struct ahash_request *req)
	208	{
	209	return crypto_shash_final(ahash_request_ctx(req), req->result);
	210	}
	211
	212	static int shash_async_digest(struct ahash_request *req)
	213	{
	214	struct scatterlist *sg = req->src;
	215	unsigned int offset = sg->offset;
	216	unsigned int nbytes = req->nbytes;
	217	int err;
	218
	219	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
	220	struct crypto_shash **ctx =
	221	crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	222	struct shash_desc *desc = ahash_request_ctx(req);
	223	void *data;
	224
	225	desc->tfm = *ctx;
	226	desc->flags = req->base.flags;
	227
	228	data = crypto_kmap(sg_page(sg), 0);
	229	err = crypto_shash_digest(desc, data + offset, nbytes,
	230	req->result);
	231	crypto_kunmap(data, 0);
	232	crypto_yield(desc->flags);
	233	goto out;
	234	}
	235
	236	err = shash_async_init(req);
	237	if (err)
	238	goto out;
239
240	err = shash_async_update(req);
241	if (err)
242	goto out;
243
244	err = shash_async_final(req);
245
246	out:
247	return err;
248	}
249
250	static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
251	{
252	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
253
254	crypto_free_shash(*ctx);
255	}
256
257	static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
258	{
259	struct crypto_alg *calg = tfm->__crt_alg;
260	struct shash_alg *alg = __crypto_shash_alg(calg);
261	struct ahash_tfm *crt = &tfm->crt_ahash;
262	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
263	struct crypto_shash *shash;
264
265	if (!crypto_mod_get(calg))
266	return -EAGAIN;
267
268	shash = __crypto_shash_cast(crypto_create_tfm(
269	calg, &crypto_shash_type));
270	if (IS_ERR(shash)) {
271	crypto_mod_put(calg);
272	return PTR_ERR(shash);
273	}
274
275	*ctx = shash;
276	tfm->exit = crypto_exit_shash_ops_async;
277
278	crt->init = shash_async_init;
279	crt->update = shash_async_update;
280	crt->final = shash_async_final;
281	crt->digest = shash_async_digest;
282	crt->setkey = shash_async_setkey;
283
284	crt->digestsize = alg->digestsize;
285	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
286
287	return 0;
288	}
289
290	static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
291	{
292	switch (mask & CRYPTO_ALG_TYPE_MASK) {
293	case CRYPTO_ALG_TYPE_AHASH_MASK:
294	return crypto_init_shash_ops_async(tfm);
295	}
296
297	return -EINVAL;
298	}
299
300	static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
301	u32 mask)
302	{
303	switch (mask & CRYPTO_ALG_TYPE_MASK) {
304	case CRYPTO_ALG_TYPE_AHASH_MASK:
305	return sizeof(struct crypto_shash *);
306	}
307
308	return 0;
309	}
310
7b5a080b HX	311	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
	312	const struct crypto_type *frontend)
	313	{
	314	if (frontend->type != CRYPTO_ALG_TYPE_SHASH)
	315	return -EINVAL;
	316	return 0;
	317	}
	318
	319	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
	320	const struct crypto_type *frontend)
	321	{
	322	return alg->cra_ctxsize;
	323	}
	324
	325	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	326	__attribute__ ((unused));
	327	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
	328	{
	329	struct shash_alg *salg = __crypto_shash_alg(alg);
	330
	331	seq_printf(m, "type : shash\n");
	332	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	333	seq_printf(m, "digestsize : %u\n", salg->digestsize);
	334	seq_printf(m, "descsize : %u\n", salg->descsize);
	335	}
	336
	337	static const struct crypto_type crypto_shash_type = {
3b2f6df0	338	.ctxsize = crypto_shash_ctxsize,
7b5a080b	339	.extsize = crypto_shash_extsize,
3b2f6df0	340	.init = crypto_init_shash_ops,
7b5a080b HX	341	.init_tfm = crypto_shash_init_tfm,
	342	#ifdef CONFIG_PROC_FS
	343	.show = crypto_shash_show,
	344	#endif
	345	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	346	.maskset = CRYPTO_ALG_TYPE_MASK,
	347	.type = CRYPTO_ALG_TYPE_SHASH,
	348	.tfmsize = offsetof(struct crypto_shash, base),
	349	};
	350
	351	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
	352	u32 mask)
	353	{
	354	return __crypto_shash_cast(
	355	crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask));
	356	}
	357	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
	358
	359	int crypto_register_shash(struct shash_alg *alg)
	360	{
	361	struct crypto_alg *base = &alg->base;
	362
	363	if (alg->digestsize > PAGE_SIZE / 8 \|\|
	364	alg->descsize > PAGE_SIZE / 8)
	365	return -EINVAL;
	366
	367	base->cra_type = &crypto_shash_type;
	368	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	369	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
	370
	371	return crypto_register_alg(base);
	372	}
	373	EXPORT_SYMBOL_GPL(crypto_register_shash);
	374
	375	int crypto_unregister_shash(struct shash_alg *alg)
	376	{
	377	return crypto_unregister_alg(&alg->base);
	378	}
	379	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
	380
	381	MODULE_LICENSE("GPL");
	382	MODULE_DESCRIPTION("Synchronous cryptographic hash type");