[linux-2.6-block.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 <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
#include <linux/string.h>

#define NULL_KEY_SIZE		0
#define NULL_BLOCK_SIZE		1
#define NULL_DIGEST_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, u32 *flags)
{ return 0; }

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

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_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 } }
};

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

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

	ret = crypto_register_alg(&digest_null);
	if (ret < 0) {
		crypto_unregister_alg(&cipher_null);
		goto out;
	}

	ret = crypto_register_alg(&compress_null);
	if (ret < 0) {
		crypto_unregister_alg(&digest_null);
		crypto_unregister_alg(&cipher_null);
		goto out;
	}

out:	
	return ret;
}

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

module_init(init);
module_exit(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	*/
	19	#include <linux/init.h>
	20	#include <linux/module.h>
	21	#include <linux/mm.h>
	22	#include <asm/scatterlist.h>
	23	#include <linux/crypto.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
	29
6c2bb98b HX	30	static int null_compress(struct crypto_tfm tfm, const u8 src,
6c2bb98b HX	31	unsigned int slen, u8 dst, unsigned int dlen)
d0856009 PM	32	{
	33	if (slen > *dlen)
	34	return -EINVAL;
	35	memcpy(dst, src, slen);
	36	*dlen = slen;
	37	return 0;
	38	}
1da177e4	39
6c2bb98b	40	static void null_init(struct crypto_tfm *tfm)
1da177e4 LT	41	{ }
1da177e4 LT	42
6c2bb98b HX	43	static void null_update(struct crypto_tfm tfm, const u8 data,
6c2bb98b HX	44	unsigned int len)
1da177e4 LT	45	{ }
1da177e4 LT	46
6c2bb98b	47	static void null_final(struct crypto_tfm tfm, u8 out)
1da177e4 LT	48	{ }
1da177e4 LT	49
6c2bb98b HX	50	static int null_setkey(struct crypto_tfm tfm, const u8 key,
6c2bb98b HX	51	unsigned int keylen, u32 *flags)
1da177e4 LT	52	{ return 0; }
1da177e4 LT	53
6c2bb98b	54	static void null_crypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
d0856009 PM	55	{
	56	memcpy(dst, src, NULL_BLOCK_SIZE);
	57	}
1da177e4 LT	58
	59	static struct crypto_alg compress_null = {
	60	.cra_name = "compress_null",
	61	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	62	.cra_blocksize = NULL_BLOCK_SIZE,
	63	.cra_ctxsize = 0,
	64	.cra_module = THIS_MODULE,
	65	.cra_list = LIST_HEAD_INIT(compress_null.cra_list),
	66	.cra_u = { .compress = {
	67	.coa_compress = null_compress,
d0856009	68	.coa_decompress = null_compress } }
1da177e4 LT	69	};
	70
	71	static struct crypto_alg digest_null = {
	72	.cra_name = "digest_null",
	73	.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
	74	.cra_blocksize = NULL_BLOCK_SIZE,
	75	.cra_ctxsize = 0,
	76	.cra_module = THIS_MODULE,
	77	.cra_list = LIST_HEAD_INIT(digest_null.cra_list),
	78	.cra_u = { .digest = {
	79	.dia_digestsize = NULL_DIGEST_SIZE,
	80	.dia_init = null_init,
	81	.dia_update = null_update,
	82	.dia_final = null_final } }
	83	};
	84
	85	static struct crypto_alg cipher_null = {
	86	.cra_name = "cipher_null",
	87	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
	88	.cra_blocksize = NULL_BLOCK_SIZE,
	89	.cra_ctxsize = 0,
	90	.cra_module = THIS_MODULE,
	91	.cra_list = LIST_HEAD_INIT(cipher_null.cra_list),
	92	.cra_u = { .cipher = {
	93	.cia_min_keysize = NULL_KEY_SIZE,
	94	.cia_max_keysize = NULL_KEY_SIZE,
	95	.cia_setkey = null_setkey,
d0856009 PM	96	.cia_encrypt = null_crypt,
d0856009 PM	97	.cia_decrypt = null_crypt } }
1da177e4 LT	98	};
	99
	100	MODULE_ALIAS("compress_null");
	101	MODULE_ALIAS("digest_null");
	102	MODULE_ALIAS("cipher_null");
	103
	104	static int __init init(void)
	105	{
	106	int ret = 0;
	107
	108	ret = crypto_register_alg(&cipher_null);
	109	if (ret < 0)
	110	goto out;
	111
	112	ret = crypto_register_alg(&digest_null);
	113	if (ret < 0) {
	114	crypto_unregister_alg(&cipher_null);
	115	goto out;
	116	}
	117
	118	ret = crypto_register_alg(&compress_null);
	119	if (ret < 0) {
	120	crypto_unregister_alg(&digest_null);
	121	crypto_unregister_alg(&cipher_null);
	122	goto out;
	123	}
	124
	125	out:
	126	return ret;
	127	}
	128
	129	static void __exit fini(void)
	130	{
	131	crypto_unregister_alg(&compress_null);
	132	crypto_unregister_alg(&digest_null);
	133	crypto_unregister_alg(&cipher_null);
	134	}
	135
	136	module_init(init);
	137	module_exit(fini);
	138
	139	MODULE_LICENSE("GPL");
	140	MODULE_DESCRIPTION("Null Cryptographic Algorithms");