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gen_tex_table.py

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  • crypto_null.c 4.37 KiB
    /*
     * 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/hash.h>
    #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 int null_init(struct shash_desc *desc)
    {
    	return 0;
    }
    
    static int null_update(struct shash_desc *desc, const u8 *data,
    		       unsigned int len)
    {
    	return 0;
    }
    
    static int null_final(struct shash_desc *desc, u8 *out)
    {
    	return 0;
    }
    
    static int null_digest(struct shash_desc *desc, const u8 *data,
    		       unsigned int len, u8 *out)
    {
    	return 0;
    }
    
    static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
    			    unsigned int keylen)
    { return 0; }
    
    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 shash_alg digest_null = {
    	.digestsize		=	NULL_DIGEST_SIZE,
    	.setkey   		=	null_hash_setkey,
    	.init   		=	null_init,
    	.update 		=	null_update,
    	.finup 			=	null_digest,
    	.digest 		=	null_digest,
    	.final  		=	null_final,
    	.base			=	{
    		.cra_name		=	"digest_null",
    		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH,
    		.cra_blocksize		=	NULL_BLOCK_SIZE,
    		.cra_module		=	THIS_MODULE,
    	}
    };
    
    static struct crypto_alg null_algs[3] = { {
    	.cra_name		=	"cipher_null",
    	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
    	.cra_blocksize		=	NULL_BLOCK_SIZE,
    	.cra_ctxsize		=	0,
    	.cra_module		=	THIS_MODULE,
    	.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 } }
    }, {
    	.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_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 } }
    }, {
    	.cra_name		=	"compress_null",
    	.cra_flags		=	CRYPTO_ALG_TYPE_COMPRESS,
    	.cra_blocksize		=	NULL_BLOCK_SIZE,
    	.cra_ctxsize		=	0,
    	.cra_module		=	THIS_MODULE,
    	.cra_u			=	{ .compress = {
    	.coa_compress		=	null_compress,
    	.coa_decompress		=	null_compress } }
    } };
    
    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_algs(null_algs, ARRAY_SIZE(null_algs));
    	if (ret < 0)
    		goto out;
    
    	ret = crypto_register_shash(&digest_null);
    	if (ret < 0)
    		goto out_unregister_algs;
    
    	return 0;
    
    out_unregister_algs:
    	crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
    out:
    	return ret;
    }
    
    static void __exit crypto_null_mod_fini(void)
    {
    	crypto_unregister_shash(&digest_null);
    	crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
    }
    
    module_init(crypto_null_mod_init);
    module_exit(crypto_null_mod_fini);
    
    MODULE_LICENSE("GPL");
    MODULE_DESCRIPTION("Null Cryptographic Algorithms");