[net-next-2.6.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 <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 crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct hash_tfm *crt = &tfm->crt_hash;
	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;

	if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
		return -EINVAL;

	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 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
	12	#include <linux/errno.h>
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
791b4d5f	15	#include <linux/slab.h>
055bcee3 HX	16	#include <linux/seq_file.h>
	17
	18	#include "internal.h"
	19
27d2a330 HX	20	static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
27d2a330 HX	21	u32 mask)
055bcee3 HX	22	{
	23	return alg->cra_ctxsize;
	24	}
	25
ca7c3938 SS	26	static int hash_setkey_unaligned(struct crypto_hash crt, const u8 key,
	27	unsigned int keylen)
	28	{
	29	struct crypto_tfm *tfm = crypto_hash_tfm(crt);
	30	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	31	unsigned long alignmask = crypto_hash_alignmask(crt);
	32	int ret;
	33	u8 buffer, alignbuffer;
	34	unsigned long absize;
	35
	36	absize = keylen + alignmask;
	37	buffer = kmalloc(absize, GFP_ATOMIC);
	38	if (!buffer)
	39	return -ENOMEM;
	40
	41	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	42	memcpy(alignbuffer, key, keylen);
	43	ret = alg->setkey(crt, alignbuffer, keylen);
06817176	44	memset(alignbuffer, 0, keylen);
ca7c3938 SS	45	kfree(buffer);
	46	return ret;
	47	}
	48
	49	static int hash_setkey(struct crypto_hash crt, const u8 key,
791b4d5f	50	unsigned int keylen)
ca7c3938 SS	51	{
	52	struct crypto_tfm *tfm = crypto_hash_tfm(crt);
	53	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	54	unsigned long alignmask = crypto_hash_alignmask(crt);
	55
	56	if ((unsigned long)key & alignmask)
	57	return hash_setkey_unaligned(crt, key, keylen);
	58
	59	return alg->setkey(crt, key, keylen);
	60	}
	61
27d2a330	62	static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
055bcee3 HX	63	{
	64	struct hash_tfm *crt = &tfm->crt_hash;
	65	struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
	66
	67	if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
	68	return -EINVAL;
	69
	70	crt->init = alg->init;
	71	crt->update = alg->update;
	72	crt->final = alg->final;
	73	crt->digest = alg->digest;
ca7c3938	74	crt->setkey = hash_setkey;
055bcee3 HX	75	crt->digestsize = alg->digestsize;
	76
	77	return 0;
	78	}
	79
	80	static void crypto_hash_show(struct seq_file m, struct crypto_alg alg)
03f5d8ce	81	__attribute__ ((unused));
055bcee3 HX	82	static void crypto_hash_show(struct seq_file m, struct crypto_alg alg)
	83	{
	84	seq_printf(m, "type : hash\n");
	85	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	86	seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
	87	}
	88
	89	const struct crypto_type crypto_hash_type = {
	90	.ctxsize = crypto_hash_ctxsize,
	91	.init = crypto_init_hash_ops,
	92	#ifdef CONFIG_PROC_FS
	93	.show = crypto_hash_show,
	94	#endif
	95	};
	96	EXPORT_SYMBOL_GPL(crypto_hash_type);
	97
	98	MODULE_LICENSE("GPL");
	99	MODULE_DESCRIPTION("Generic cryptographic hash type");