[linux-block.git] / crypto / hash.c

/*
 * Cryptographic Hash operations.
 * 
 * Copyright (c) 2006 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/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include "internal.h"

static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
					u32 mask)
{
	return alg->cra_ctxsize;
}

static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
		                 unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_hash_tfm(crt);
	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	unsigned long alignmask = crypto_hash_alignmask(crt);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = alg->setkey(crt, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int hash_setkey(struct crypto_hash *crt, const u8 *key,
		       unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_hash_tfm(crt);
	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	unsigned long alignmask = crypto_hash_alignmask(crt);

	if ((unsigned long)key & alignmask)
		return hash_setkey_unaligned(crt, key, keylen);

	return alg->setkey(crt, key, keylen);
}

static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
			unsigned int keylen)
{
	struct crypto_tfm  *tfm      = crypto_ahash_tfm(tfm_async);
	struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
	struct hash_alg    *alg      = &tfm->__crt_alg->cra_hash;

	return alg->setkey(tfm_hash, key, keylen);
}

static int hash_async_init(struct ahash_request *req)
{
	struct crypto_tfm *tfm = req->base.tfm;
	struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
	struct hash_desc  desc = {
		.tfm = __crypto_hash_cast(tfm),
		.flags = req->base.flags,
	};

	return alg->init(&desc);
}

static int hash_async_update(struct ahash_request *req)
{
	struct crypto_tfm *tfm = req->base.tfm;
	struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
	struct hash_desc  desc = {
		.tfm = __crypto_hash_cast(tfm),
		.flags = req->base.flags,
	};

	return alg->update(&desc, req->src, req->nbytes);
}

static int hash_async_final(struct ahash_request *req)
{
	struct crypto_tfm *tfm = req->base.tfm;
	struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
	struct hash_desc  desc = {
		.tfm = __crypto_hash_cast(tfm),
		.flags = req->base.flags,
	};

	return alg->final(&desc, req->result);
}

static int hash_async_digest(struct ahash_request *req)
{
	struct crypto_tfm *tfm = req->base.tfm;
	struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
	struct hash_desc  desc = {
		.tfm = __crypto_hash_cast(tfm),
		.flags = req->base.flags,
	};

	return alg->digest(&desc, req->src, req->nbytes, req->result);
}

static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
{
	struct ahash_tfm *crt = &tfm->crt_ahash;
	struct hash_alg  *alg = &tfm->__crt_alg->cra_hash;

	crt->init       = hash_async_init;
	crt->update     = hash_async_update;
	crt->final      = hash_async_final;
	crt->digest     = hash_async_digest;
	crt->setkey     = hash_async_setkey;
	crt->digestsize = alg->digestsize;

	return 0;
}

static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
{
	struct hash_tfm *crt = &tfm->crt_hash;
	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;

	crt->init       = alg->init;
	crt->update     = alg->update;
	crt->final      = alg->final;
	crt->digest     = alg->digest;
	crt->setkey     = hash_setkey;
	crt->digestsize = alg->digestsize;

	return 0;
}

static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;

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

	if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
		return crypto_init_hash_ops_async(tfm);
	else
		return crypto_init_hash_ops_sync(tfm);
}

static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
{
	seq_printf(m, "type         : hash\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "digestsize   : %u\n", alg->cra_hash.digestsize);
}

const struct crypto_type crypto_hash_type = {
	.ctxsize = crypto_hash_ctxsize,
	.init = crypto_init_hash_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_hash_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_hash_type);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic cryptographic hash type");
Commit	Line	Data
055bcee3 HX	1	/*
	2	* Cryptographic Hash operations.
	3	*
	4	* Copyright (c) 2006 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
18e33e6d	12	#include <crypto/internal/hash.h>
055bcee3 HX	13	#include <linux/errno.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
791b4d5f	16	#include <linux/slab.h>
055bcee3 HX	17	#include <linux/seq_file.h>
	18
	19	#include "internal.h"
	20
27d2a330 HX	21	static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
27d2a330 HX	22	u32 mask)
055bcee3 HX	23	{
	24	return alg->cra_ctxsize;
	25	}
	26
ca7c3938 SS	27	static int hash_setkey_unaligned(struct crypto_hash crt, const u8 key,
	28	unsigned int keylen)
	29	{
	30	struct crypto_tfm *tfm = crypto_hash_tfm(crt);
	31	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	32	unsigned long alignmask = crypto_hash_alignmask(crt);
	33	int ret;
	34	u8 buffer, alignbuffer;
	35	unsigned long absize;
	36
	37	absize = keylen + alignmask;
	38	buffer = kmalloc(absize, GFP_ATOMIC);
	39	if (!buffer)
	40	return -ENOMEM;
	41
	42	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	43	memcpy(alignbuffer, key, keylen);
	44	ret = alg->setkey(crt, alignbuffer, keylen);
06817176	45	memset(alignbuffer, 0, keylen);
ca7c3938 SS	46	kfree(buffer);
	47	return ret;
	48	}
	49
	50	static int hash_setkey(struct crypto_hash crt, const u8 key,
791b4d5f	51	unsigned int keylen)
ca7c3938 SS	52	{
	53	struct crypto_tfm *tfm = crypto_hash_tfm(crt);
	54	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	55	unsigned long alignmask = crypto_hash_alignmask(crt);
	56
	57	if ((unsigned long)key & alignmask)
	58	return hash_setkey_unaligned(crt, key, keylen);
	59
	60	return alg->setkey(crt, key, keylen);
	61	}
	62
004a403c LH	63	static int hash_async_setkey(struct crypto_ahash tfm_async, const u8 key,
	64	unsigned int keylen)
	65	{
	66	struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async);
	67	struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
	68	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	69
	70	return alg->setkey(tfm_hash, key, keylen);
	71	}
	72
	73	static int hash_async_init(struct ahash_request *req)
	74	{
	75	struct crypto_tfm *tfm = req->base.tfm;
	76	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	77	struct hash_desc desc = {
	78	.tfm = __crypto_hash_cast(tfm),
	79	.flags = req->base.flags,
	80	};
	81
	82	return alg->init(&desc);
	83	}
	84
	85	static int hash_async_update(struct ahash_request *req)
	86	{
	87	struct crypto_tfm *tfm = req->base.tfm;
	88	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	89	struct hash_desc desc = {
	90	.tfm = __crypto_hash_cast(tfm),
	91	.flags = req->base.flags,
	92	};
	93
	94	return alg->update(&desc, req->src, req->nbytes);
	95	}
	96
	97	static int hash_async_final(struct ahash_request *req)
	98	{
	99	struct crypto_tfm *tfm = req->base.tfm;
	100	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	101	struct hash_desc desc = {
	102	.tfm = __crypto_hash_cast(tfm),
	103	.flags = req->base.flags,
	104	};
	105
	106	return alg->final(&desc, req->result);
	107	}
	108
	109	static int hash_async_digest(struct ahash_request *req)
	110	{
	111	struct crypto_tfm *tfm = req->base.tfm;
	112	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	113	struct hash_desc desc = {
	114	.tfm = __crypto_hash_cast(tfm),
	115	.flags = req->base.flags,
	116	};
	117
	118	return alg->digest(&desc, req->src, req->nbytes, req->result);
	119	}
	120
	121	static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
	122	{
	123	struct ahash_tfm *crt = &tfm->crt_ahash;
	124	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	125
	126	crt->init = hash_async_init;
127	crt->update = hash_async_update;
128	crt->final = hash_async_final;
129	crt->digest = hash_async_digest;
130	crt->setkey = hash_async_setkey;
131	crt->digestsize = alg->digestsize;
004a403c LH	132
	133	return 0;
	134	}
	135
	136	static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
055bcee3 HX	137	{
	138	struct hash_tfm *crt = &tfm->crt_hash;
	139	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	140
004a403c LH	141	crt->init = alg->init;
	142	crt->update = alg->update;
	143	crt->final = alg->final;
	144	crt->digest = alg->digest;
	145	crt->setkey = hash_setkey;
055bcee3 HX	146	crt->digestsize = alg->digestsize;
	147
	148	return 0;
	149	}
	150
004a403c LH	151	static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	152	{
	153	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	154
ca786dc7	155	if (alg->digestsize > PAGE_SIZE / 8)
004a403c LH	156	return -EINVAL;
	157
	158	if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
	159	return crypto_init_hash_ops_async(tfm);
	160	else
	161	return crypto_init_hash_ops_sync(tfm);
	162	}
	163
055bcee3	164	static void crypto_hash_show(struct seq_file m, struct crypto_alg alg)
03f5d8ce	165	__attribute__ ((unused));
055bcee3 HX	166	static void crypto_hash_show(struct seq_file m, struct crypto_alg alg)
	167	{
	168	seq_printf(m, "type : hash\n");
	169	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	170	seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
	171	}
	172
	173	const struct crypto_type crypto_hash_type = {
	174	.ctxsize = crypto_hash_ctxsize,
	175	.init = crypto_init_hash_ops,
	176	#ifdef CONFIG_PROC_FS
	177	.show = crypto_hash_show,
	178	#endif
	179	};
	180	EXPORT_SYMBOL_GPL(crypto_hash_type);
	181
	182	MODULE_LICENSE("GPL");
	183	MODULE_DESCRIPTION("Generic cryptographic hash type");