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

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 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 = {
	.extsize = crypto_shash_extsize,
	.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
	13	#include <crypto/internal/hash.h>
	14	#include <linux/err.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/slab.h>
	18	#include <linux/seq_file.h>
	19
	20	static inline struct crypto_shash __crypto_shash_cast(struct crypto_tfm tfm)
	21	{
	22	return container_of(tfm, struct crypto_shash, base);
	23	}
	24
	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
	53	if ((unsigned long)key & alignmask)
	54	return shash_setkey_unaligned(tfm, key, keylen);
	55
	56	return shash->setkey(tfm, key, keylen);
	57	}
	58	EXPORT_SYMBOL_GPL(crypto_shash_setkey);
	59
	60	static inline unsigned int shash_align_buffer_size(unsigned len,
	61	unsigned long mask)
	62	{
	63	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
	64	}
65
66	static int shash_update_unaligned(struct shash_desc desc, const u8 data,
67	unsigned int len)
68	{
69	struct crypto_shash *tfm = desc->tfm;
70	struct shash_alg *shash = crypto_shash_alg(tfm);
71	unsigned long alignmask = crypto_shash_alignmask(tfm);
72	unsigned int unaligned_len = alignmask + 1 -
73	((unsigned long)data & alignmask);
74	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
75	__attribute__ ((aligned));
76
77	memcpy(buf, data, unaligned_len);
78
79	return shash->update(desc, buf, unaligned_len) ?:
80	shash->update(desc, data + unaligned_len, len - unaligned_len);
81	}
82
83	int crypto_shash_update(struct shash_desc desc, const u8 data,
84	unsigned int len)
85	{
86	struct crypto_shash *tfm = desc->tfm;
87	struct shash_alg *shash = crypto_shash_alg(tfm);
88	unsigned long alignmask = crypto_shash_alignmask(tfm);
89
90	if ((unsigned long)data & alignmask)
91	return shash_update_unaligned(desc, data, len);
92
93	return shash->update(desc, data, len);
94	}
95	EXPORT_SYMBOL_GPL(crypto_shash_update);
96
97	static int shash_final_unaligned(struct shash_desc desc, u8 out)
98	{
99	struct crypto_shash *tfm = desc->tfm;
100	unsigned long alignmask = crypto_shash_alignmask(tfm);
101	struct shash_alg *shash = crypto_shash_alg(tfm);
102	unsigned int ds = crypto_shash_digestsize(tfm);
103	u8 buf[shash_align_buffer_size(ds, alignmask)]
104	__attribute__ ((aligned));
105	int err;
106
107	err = shash->final(desc, buf);
108	memcpy(out, buf, ds);
109	return err;
110	}
111
112	int crypto_shash_final(struct shash_desc desc, u8 out)
113	{
114	struct crypto_shash *tfm = desc->tfm;
115	struct shash_alg *shash = crypto_shash_alg(tfm);
116	unsigned long alignmask = crypto_shash_alignmask(tfm);
117
118	if ((unsigned long)out & alignmask)
119	return shash_final_unaligned(desc, out);
120
121	return shash->final(desc, out);
122	}
123	EXPORT_SYMBOL_GPL(crypto_shash_final);
124
125	static int shash_finup_unaligned(struct shash_desc desc, const u8 data,
126	unsigned int len, u8 *out)
127	{
128	return crypto_shash_update(desc, data, len) ?:
129	crypto_shash_final(desc, out);
130	}
131
132	int crypto_shash_finup(struct shash_desc desc, const u8 data,
133	unsigned int len, u8 *out)
134	{
135	struct crypto_shash *tfm = desc->tfm;
136	struct shash_alg *shash = crypto_shash_alg(tfm);
137	unsigned long alignmask = crypto_shash_alignmask(tfm);
138
139	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
140	!shash->finup)
141	return shash_finup_unaligned(desc, data, len, out);
142
143	return shash->finup(desc, data, len, out);
144	}
145	EXPORT_SYMBOL_GPL(crypto_shash_finup);
146
147	static int shash_digest_unaligned(struct shash_desc desc, const u8 data,
148	unsigned int len, u8 *out)
149	{
150	return crypto_shash_init(desc) ?:
151	crypto_shash_update(desc, data, len) ?:
152	crypto_shash_final(desc, out);
153	}
154
155	int crypto_shash_digest(struct shash_desc desc, const u8 data,
156	unsigned int len, u8 *out)
157	{
158	struct crypto_shash *tfm = desc->tfm;
159	struct shash_alg *shash = crypto_shash_alg(tfm);
160	unsigned long alignmask = crypto_shash_alignmask(tfm);
161
162	if (((unsigned long)data \| (unsigned long)out) & alignmask \|\|
163	!shash->digest)
164	return shash_digest_unaligned(desc, data, len, out);
165
166	return shash->digest(desc, data, len, out);
167	}
168	EXPORT_SYMBOL_GPL(crypto_shash_digest);
169
170	static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
171	const struct crypto_type *frontend)
172	{
173	if (frontend->type != CRYPTO_ALG_TYPE_SHASH)
174	return -EINVAL;
175	return 0;
176	}
177
178	static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
179	const struct crypto_type *frontend)
180	{
181	return alg->cra_ctxsize;
182	}
183
184	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
185	__attribute__ ((unused));
186	static void crypto_shash_show(struct seq_file m, struct crypto_alg alg)
187	{
188	struct shash_alg *salg = __crypto_shash_alg(alg);
189
190	seq_printf(m, "type : shash\n");
191	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
192	seq_printf(m, "digestsize : %u\n", salg->digestsize);
193	seq_printf(m, "descsize : %u\n", salg->descsize);
194	}
195
196	static const struct crypto_type crypto_shash_type = {
197	.extsize = crypto_shash_extsize,
198	.init_tfm = crypto_shash_init_tfm,
199	#ifdef CONFIG_PROC_FS
200	.show = crypto_shash_show,
201	#endif
202	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
203	.maskset = CRYPTO_ALG_TYPE_MASK,
204	.type = CRYPTO_ALG_TYPE_SHASH,
205	.tfmsize = offsetof(struct crypto_shash, base),
206	};
207
208	struct crypto_shash crypto_alloc_shash(const char alg_name, u32 type,
209	u32 mask)
210	{
211	return __crypto_shash_cast(
212	crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask));
213	}
214	EXPORT_SYMBOL_GPL(crypto_alloc_shash);
215
216	int crypto_register_shash(struct shash_alg *alg)
217	{
218	struct crypto_alg *base = &alg->base;
219
220	if (alg->digestsize > PAGE_SIZE / 8 \|\|
221	alg->descsize > PAGE_SIZE / 8)
222	return -EINVAL;
223
224	base->cra_type = &crypto_shash_type;
225	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
226	base->cra_flags \|= CRYPTO_ALG_TYPE_SHASH;
227
228	return crypto_register_alg(base);
229	}
230	EXPORT_SYMBOL_GPL(crypto_register_shash);
231
232	int crypto_unregister_shash(struct shash_alg *alg)
233	{
234	return crypto_unregister_alg(&alg->base);
235	}
236	EXPORT_SYMBOL_GPL(crypto_unregister_shash);
237
238	MODULE_LICENSE("GPL");
239	MODULE_DESCRIPTION("Synchronous cryptographic hash type");