[net-next-2.6.git] / crypto / ablkcipher.c

/*
 * Asynchronous block chaining cipher operations.
 * 
 * This is the asynchronous version of blkcipher.c indicating completion
 * via a callback.
 *
 * 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/algapi.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	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 = cipher->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
		  unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);

	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
		crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	if ((unsigned long)key & alignmask)
		return setkey_unaligned(tfm, key, keylen);

	return cipher->setkey(tfm, key, keylen);
}

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

static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
				      u32 mask)
{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

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

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	crt->ivsize = alg->ivsize;

	return 0;
}

static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type         : ablkcipher\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
}

const struct crypto_type crypto_ablkcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_ablkcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_ablkcipher_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Asynchronous block chaining cipher type");
Commit	Line	Data
b5b7f088 HX	1	/*
	2	* Asynchronous block chaining cipher operations.
	3	*
	4	* This is the asynchronous version of blkcipher.c indicating completion
	5	* via a callback.
	6	*
	7	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*
	14	*/
	15
	16	#include <crypto/algapi.h>
	17	#include <linux/errno.h>
	18	#include <linux/init.h>
791b4d5f	19	#include <linux/kernel.h>
b5b7f088	20	#include <linux/module.h>
791b4d5f	21	#include <linux/slab.h>
b5b7f088 HX	22	#include <linux/seq_file.h>
b5b7f088 HX	23
791b4d5f HX	24	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	25	unsigned int keylen)
ca7c3938 SS	26	{
	27	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	28	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	29	int ret;
	30	u8 buffer, alignbuffer;
	31	unsigned long absize;
	32
	33	absize = keylen + alignmask;
	34	buffer = kmalloc(absize, GFP_ATOMIC);
	35	if (!buffer)
	36	return -ENOMEM;
	37
	38	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	39	memcpy(alignbuffer, key, keylen);
	40	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	41	memset(alignbuffer, 0, keylen);
ca7c3938 SS	42	kfree(buffer);
	43	return ret;
	44	}
	45
b5b7f088 HX	46	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	47	unsigned int keylen)
	48	{
	49	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	50	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	51
	52	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	53	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	54	return -EINVAL;
	55	}
	56
ca7c3938 SS	57	if ((unsigned long)key & alignmask)
	58	return setkey_unaligned(tfm, key, keylen);
	59
b5b7f088 HX	60	return cipher->setkey(tfm, key, keylen);
	61	}
	62
	63	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	64	u32 mask)
	65	{
	66	return alg->cra_ctxsize;
	67	}
	68
	69	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	70	u32 mask)
	71	{
	72	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	73	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	74
	75	if (alg->ivsize > PAGE_SIZE / 8)
	76	return -EINVAL;
	77
	78	crt->setkey = setkey;
	79	crt->encrypt = alg->encrypt;
	80	crt->decrypt = alg->decrypt;
	81	crt->ivsize = alg->ivsize;
	82
	83	return 0;
	84	}
	85
	86	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	87	__attribute__ ((unused));
	88	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	89	{
	90	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	91
	92	seq_printf(m, "type : ablkcipher\n");
	93	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	94	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	95	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	96	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
b5b7f088 HX	97	}
	98
	99	const struct crypto_type crypto_ablkcipher_type = {
	100	.ctxsize = crypto_ablkcipher_ctxsize,
	101	.init = crypto_init_ablkcipher_ops,
	102	#ifdef CONFIG_PROC_FS
	103	.show = crypto_ablkcipher_show,
	104	#endif
	105	};
	106	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	107
	108	MODULE_LICENSE("GPL");
	109	MODULE_DESCRIPTION("Asynchronous block chaining cipher type");