[deliverable/linux.git] / crypto / crypto_null.c

/* 
 * Cryptographic API.
 *
 * Null algorithms, aka Much Ado About Nothing.
 *
 * These are needed for IPsec, and may be useful in general for
 * testing & debugging.
 * 
 * The null cipher is compliant with RFC2410.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.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/skcipher.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/string.h>

#define NULL_KEY_SIZE		0
#define NULL_BLOCK_SIZE		1
#define NULL_DIGEST_SIZE	0
#define NULL_IV_SIZE		0

static int null_compress(struct crypto_tfm *tfm, const u8 *src,
			 unsigned int slen, u8 *dst, unsigned int *dlen)
{
	if (slen > *dlen)
		return -EINVAL;
	memcpy(dst, src, slen);
	*dlen = slen;
	return 0;
}

static void null_init(struct crypto_tfm *tfm)
{ }

static void null_update(struct crypto_tfm *tfm, const u8 *data,
			unsigned int len)
{ }

static void null_final(struct crypto_tfm *tfm, u8 *out)
{ }

static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
		       unsigned int keylen)
{ return 0; }

static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	memcpy(dst, src, NULL_BLOCK_SIZE);
}

static int skcipher_null_crypt(struct blkcipher_desc *desc,
			       struct scatterlist *dst,
			       struct scatterlist *src, unsigned int nbytes)
{
	struct blkcipher_walk walk;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	while (walk.nbytes) {
		if (walk.src.virt.addr != walk.dst.virt.addr)
			memcpy(walk.dst.virt.addr, walk.src.virt.addr,
			       walk.nbytes);
		err = blkcipher_walk_done(desc, &walk, 0);
	}

	return err;
}

static struct crypto_alg compress_null = {
	.cra_name		=	"compress_null",
	.cra_flags		=	CRYPTO_ALG_TYPE_COMPRESS,
	.cra_blocksize		=	NULL_BLOCK_SIZE,
	.cra_ctxsize		=	0,
	.cra_module		=	THIS_MODULE,
	.cra_list		=       LIST_HEAD_INIT(compress_null.cra_list),
	.cra_u			=	{ .compress = {
	.coa_compress 		=	null_compress,
	.coa_decompress		=	null_compress } }
};

static struct crypto_alg digest_null = {
	.cra_name		=	"digest_null",
	.cra_flags		=	CRYPTO_ALG_TYPE_DIGEST,
	.cra_blocksize		=	NULL_BLOCK_SIZE,
	.cra_ctxsize		=	0,
	.cra_module		=	THIS_MODULE,
	.cra_list		=       LIST_HEAD_INIT(digest_null.cra_list),	
	.cra_u			=	{ .digest = {
	.dia_digestsize		=	NULL_DIGEST_SIZE,
	.dia_setkey   		=	null_setkey,
	.dia_init   		=	null_init,
	.dia_update 		=	null_update,
	.dia_final  		=	null_final } }
};

static struct crypto_alg cipher_null = {
	.cra_name		=	"cipher_null",
	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		=	NULL_BLOCK_SIZE,
	.cra_ctxsize		=	0,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(cipher_null.cra_list),
	.cra_u			=	{ .cipher = {
	.cia_min_keysize	=	NULL_KEY_SIZE,
	.cia_max_keysize	=	NULL_KEY_SIZE,
	.cia_setkey		= 	null_setkey,
	.cia_encrypt		=	null_crypt,
	.cia_decrypt		=	null_crypt } }
};

static struct crypto_alg skcipher_null = {
	.cra_name		=	"ecb(cipher_null)",
	.cra_driver_name	=	"ecb-cipher_null",
	.cra_priority		=	100,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	NULL_BLOCK_SIZE,
	.cra_type		=	&crypto_blkcipher_type,
	.cra_ctxsize		=	0,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(skcipher_null.cra_list),
	.cra_u			=	{ .blkcipher = {
	.min_keysize		=	NULL_KEY_SIZE,
	.max_keysize		=	NULL_KEY_SIZE,
	.ivsize			=	NULL_IV_SIZE,
	.setkey			= 	null_setkey,
	.encrypt		=	skcipher_null_crypt,
	.decrypt		=	skcipher_null_crypt } }
};

MODULE_ALIAS("compress_null");
MODULE_ALIAS("digest_null");
MODULE_ALIAS("cipher_null");

static int __init crypto_null_mod_init(void)
{
	int ret = 0;
	
	ret = crypto_register_alg(&cipher_null);
	if (ret < 0)
		goto out;

	ret = crypto_register_alg(&skcipher_null);
	if (ret < 0)
		goto out_unregister_cipher;

	ret = crypto_register_alg(&digest_null);
	if (ret < 0)
		goto out_unregister_skcipher;

	ret = crypto_register_alg(&compress_null);
	if (ret < 0)
		goto out_unregister_digest;

out:	
	return ret;

out_unregister_digest:
	crypto_unregister_alg(&digest_null);
out_unregister_skcipher:
	crypto_unregister_alg(&skcipher_null);
out_unregister_cipher:
	crypto_unregister_alg(&cipher_null);
	goto out;
}

static void __exit crypto_null_mod_fini(void)
{
	crypto_unregister_alg(&compress_null);
	crypto_unregister_alg(&digest_null);
	crypto_unregister_alg(&skcipher_null);
	crypto_unregister_alg(&cipher_null);
}

module_init(crypto_null_mod_init);
module_exit(crypto_null_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Null Cryptographic Algorithms");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Cryptographic API.
	3	*
	4	* Null algorithms, aka Much Ado About Nothing.
	5	*
	6	* These are needed for IPsec, and may be useful in general for
	7	* testing & debugging.
	8	*
	9	* The null cipher is compliant with RFC2410.
	10	*
	11	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	*/
3631c650 HX	19
3631c650 HX	20	#include <crypto/internal/skcipher.h>
1da177e4 LT	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/mm.h>
d0856009	24	#include <linux/string.h>
1da177e4 LT	25
	26	#define NULL_KEY_SIZE 0
	27	#define NULL_BLOCK_SIZE 1
	28	#define NULL_DIGEST_SIZE 0
3631c650	29	#define NULL_IV_SIZE 0
1da177e4	30
6c2bb98b HX	31	static int null_compress(struct crypto_tfm tfm, const u8 src,
6c2bb98b HX	32	unsigned int slen, u8 dst, unsigned int dlen)
d0856009 PM	33	{
	34	if (slen > *dlen)
	35	return -EINVAL;
	36	memcpy(dst, src, slen);
	37	*dlen = slen;
	38	return 0;
	39	}
1da177e4	40
6c2bb98b	41	static void null_init(struct crypto_tfm *tfm)
1da177e4 LT	42	{ }
1da177e4 LT	43
6c2bb98b HX	44	static void null_update(struct crypto_tfm tfm, const u8 data,
6c2bb98b HX	45	unsigned int len)
1da177e4 LT	46	{ }
1da177e4 LT	47
6c2bb98b	48	static void null_final(struct crypto_tfm tfm, u8 out)
1da177e4 LT	49	{ }
1da177e4 LT	50
6c2bb98b	51	static int null_setkey(struct crypto_tfm tfm, const u8 key,
560c06ae	52	unsigned int keylen)
1da177e4 LT	53	{ return 0; }
1da177e4 LT	54
6c2bb98b	55	static void null_crypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
d0856009 PM	56	{
	57	memcpy(dst, src, NULL_BLOCK_SIZE);
	58	}
1da177e4	59
3631c650 HX	60	static int skcipher_null_crypt(struct blkcipher_desc *desc,
	61	struct scatterlist *dst,
	62	struct scatterlist *src, unsigned int nbytes)
	63	{
	64	struct blkcipher_walk walk;
	65	int err;
	66
	67	blkcipher_walk_init(&walk, dst, src, nbytes);
	68	err = blkcipher_walk_virt(desc, &walk);
	69
	70	while (walk.nbytes) {
	71	if (walk.src.virt.addr != walk.dst.virt.addr)
	72	memcpy(walk.dst.virt.addr, walk.src.virt.addr,
	73	walk.nbytes);
	74	err = blkcipher_walk_done(desc, &walk, 0);
	75	}
	76
	77	return err;
	78	}
	79
1da177e4 LT	80	static struct crypto_alg compress_null = {
	81	.cra_name = "compress_null",
	82	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	83	.cra_blocksize = NULL_BLOCK_SIZE,
	84	.cra_ctxsize = 0,
	85	.cra_module = THIS_MODULE,
	86	.cra_list = LIST_HEAD_INIT(compress_null.cra_list),
	87	.cra_u = { .compress = {
	88	.coa_compress = null_compress,
d0856009	89	.coa_decompress = null_compress } }
1da177e4 LT	90	};
	91
	92	static struct crypto_alg digest_null = {
	93	.cra_name = "digest_null",
	94	.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
	95	.cra_blocksize = NULL_BLOCK_SIZE,
	96	.cra_ctxsize = 0,
	97	.cra_module = THIS_MODULE,
	98	.cra_list = LIST_HEAD_INIT(digest_null.cra_list),
	99	.cra_u = { .digest = {
	100	.dia_digestsize = NULL_DIGEST_SIZE,
ce5bd4ac	101	.dia_setkey = null_setkey,
1da177e4 LT	102	.dia_init = null_init,
	103	.dia_update = null_update,
	104	.dia_final = null_final } }
	105	};
	106
	107	static struct crypto_alg cipher_null = {
	108	.cra_name = "cipher_null",
	109	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
	110	.cra_blocksize = NULL_BLOCK_SIZE,
	111	.cra_ctxsize = 0,
	112	.cra_module = THIS_MODULE,
	113	.cra_list = LIST_HEAD_INIT(cipher_null.cra_list),
	114	.cra_u = { .cipher = {
	115	.cia_min_keysize = NULL_KEY_SIZE,
	116	.cia_max_keysize = NULL_KEY_SIZE,
	117	.cia_setkey = null_setkey,
d0856009 PM	118	.cia_encrypt = null_crypt,
d0856009 PM	119	.cia_decrypt = null_crypt } }
1da177e4 LT	120	};
1da177e4 LT	121
3631c650 HX	122	static struct crypto_alg skcipher_null = {
	123	.cra_name = "ecb(cipher_null)",
	124	.cra_driver_name = "ecb-cipher_null",
	125	.cra_priority = 100,
	126	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	127	.cra_blocksize = NULL_BLOCK_SIZE,
	128	.cra_type = &crypto_blkcipher_type,
	129	.cra_ctxsize = 0,
	130	.cra_module = THIS_MODULE,
	131	.cra_list = LIST_HEAD_INIT(skcipher_null.cra_list),
	132	.cra_u = { .blkcipher = {
	133	.min_keysize = NULL_KEY_SIZE,
	134	.max_keysize = NULL_KEY_SIZE,
	135	.ivsize = NULL_IV_SIZE,
	136	.setkey = null_setkey,
	137	.encrypt = skcipher_null_crypt,
	138	.decrypt = skcipher_null_crypt } }
	139	};
	140
1da177e4 LT	141	MODULE_ALIAS("compress_null");
	142	MODULE_ALIAS("digest_null");
	143	MODULE_ALIAS("cipher_null");
	144
3af5b90b	145	static int __init crypto_null_mod_init(void)
1da177e4 LT	146	{
	147	int ret = 0;
	148
	149	ret = crypto_register_alg(&cipher_null);
	150	if (ret < 0)
	151	goto out;
	152
3631c650 HX	153	ret = crypto_register_alg(&skcipher_null);
	154	if (ret < 0)
	155	goto out_unregister_cipher;
	156
1da177e4	157	ret = crypto_register_alg(&digest_null);
3631c650 HX	158	if (ret < 0)
3631c650 HX	159	goto out_unregister_skcipher;
1da177e4 LT	160
1da177e4 LT	161	ret = crypto_register_alg(&compress_null);
3631c650 HX	162	if (ret < 0)
3631c650 HX	163	goto out_unregister_digest;
1da177e4 LT	164
	165	out:
	166	return ret;
3631c650 HX	167
	168	out_unregister_digest:
	169	crypto_unregister_alg(&digest_null);
	170	out_unregister_skcipher:
	171	crypto_unregister_alg(&skcipher_null);
	172	out_unregister_cipher:
	173	crypto_unregister_alg(&cipher_null);
	174	goto out;
1da177e4 LT	175	}
1da177e4 LT	176
3af5b90b	177	static void __exit crypto_null_mod_fini(void)
1da177e4 LT	178	{
	179	crypto_unregister_alg(&compress_null);
	180	crypto_unregister_alg(&digest_null);
3631c650	181	crypto_unregister_alg(&skcipher_null);
1da177e4 LT	182	crypto_unregister_alg(&cipher_null);
	183	}
	184
3af5b90b KB	185	module_init(crypto_null_mod_init);
3af5b90b KB	186	module_exit(crypto_null_mod_fini);
1da177e4 LT	187
	188	MODULE_LICENSE("GPL");
	189	MODULE_DESCRIPTION("Null Cryptographic Algorithms");