crypto_null.c

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    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 
   20 #include <crypto/internal/hash.h>
   21 #include <crypto/internal/skcipher.h>
   22 #include <linux/init.h>
   23 #include <linux/module.h>
   24 #include <linux/mm.h>
   25 #include <linux/string.h>
   26 
   27 #define NULL_KEY_SIZE           0
   28 #define NULL_BLOCK_SIZE         1
   29 #define NULL_DIGEST_SIZE        0
   30 #define NULL_IV_SIZE            0
   31 
   32 static int null_compress(struct crypto_tfm *tfm, const u8 *src,
   33                          unsigned int slen, u8 *dst, unsigned int *dlen)
   34 {
   35         if (slen > *dlen)
   36                 return -EINVAL;
   37         memcpy(dst, src, slen);
   38         *dlen = slen;
   39         return 0;
   40 }
   41 
   42 static int null_init(struct shash_desc *desc)
   43 {
   44         return 0;
   45 }
   46 
   47 static int null_update(struct shash_desc *desc, const u8 *data,
   48                        unsigned int len)
   49 {
   50         return 0;
   51 }
   52 
   53 static int null_final(struct shash_desc *desc, u8 *out)
   54 {
   55         return 0;
   56 }
   57 
   58 static int null_digest(struct shash_desc *desc, const u8 *data,
   59                        unsigned int len, u8 *out)
   60 {
   61         return 0;
   62 }
   63 
   64 static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
   65                             unsigned int keylen)
   66 { return 0; }
   67 
   68 static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
   69                        unsigned int keylen)
   70 { return 0; }
   71 
   72 static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
   73 {
   74         memcpy(dst, src, NULL_BLOCK_SIZE);
   75 }
   76 
   77 static int skcipher_null_crypt(struct blkcipher_desc *desc,
   78                                struct scatterlist *dst,
   79                                struct scatterlist *src, unsigned int nbytes)
   80 {
   81         struct blkcipher_walk walk;
   82         int err;
   83 
   84         blkcipher_walk_init(&walk, dst, src, nbytes);
   85         err = blkcipher_walk_virt(desc, &walk);
   86 
   87         while (walk.nbytes) {
   88                 if (walk.src.virt.addr != walk.dst.virt.addr)
   89                         memcpy(walk.dst.virt.addr, walk.src.virt.addr,
   90                                walk.nbytes);
   91                 err = blkcipher_walk_done(desc, &walk, 0);
   92         }
   93 
   94         return err;
   95 }
   96 
   97 static struct shash_alg digest_null = {
   98         .digestsize             =       NULL_DIGEST_SIZE,
   99         .setkey                 =       null_hash_setkey,
  100         .init                   =       null_init,
  101         .update                 =       null_update,
  102         .finup                  =       null_digest,
  103         .digest                 =       null_digest,
  104         .final                  =       null_final,
  105         .base                   =       {
  106                 .cra_name               =       "digest_null",
  107                 .cra_flags              =       CRYPTO_ALG_TYPE_SHASH,
  108                 .cra_blocksize          =       NULL_BLOCK_SIZE,
  109                 .cra_module             =       THIS_MODULE,
  110         }
  111 };
  112 
  113 static struct crypto_alg null_algs[3] = { {
  114         .cra_name               =       "cipher_null",
  115         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
  116         .cra_blocksize          =       NULL_BLOCK_SIZE,
  117         .cra_ctxsize            =       0,
  118         .cra_module             =       THIS_MODULE,
  119         .cra_u                  =       { .cipher = {
  120         .cia_min_keysize        =       NULL_KEY_SIZE,
  121         .cia_max_keysize        =       NULL_KEY_SIZE,
  122         .cia_setkey             =       null_setkey,
  123         .cia_encrypt            =       null_crypt,
  124         .cia_decrypt            =       null_crypt } }
  125 }, {
  126         .cra_name               =       "ecb(cipher_null)",
  127         .cra_driver_name        =       "ecb-cipher_null",
  128         .cra_priority           =       100,
  129         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
  130         .cra_blocksize          =       NULL_BLOCK_SIZE,
  131         .cra_type               =       &crypto_blkcipher_type,
  132         .cra_ctxsize            =       0,
  133         .cra_module             =       THIS_MODULE,
  134         .cra_u                  =       { .blkcipher = {
  135         .min_keysize            =       NULL_KEY_SIZE,
  136         .max_keysize            =       NULL_KEY_SIZE,
  137         .ivsize                 =       NULL_IV_SIZE,
  138         .setkey                 =       null_setkey,
  139         .encrypt                =       skcipher_null_crypt,
  140         .decrypt                =       skcipher_null_crypt } }
  141 }, {
  142         .cra_name               =       "compress_null",
  143         .cra_flags              =       CRYPTO_ALG_TYPE_COMPRESS,
  144         .cra_blocksize          =       NULL_BLOCK_SIZE,
  145         .cra_ctxsize            =       0,
  146         .cra_module             =       THIS_MODULE,
  147         .cra_u                  =       { .compress = {
  148         .coa_compress           =       null_compress,
  149         .coa_decompress         =       null_compress } }
  150 } };
  151 
  152 MODULE_ALIAS("compress_null");
  153 MODULE_ALIAS("digest_null");
  154 MODULE_ALIAS("cipher_null");
  155 
  156 static int __init crypto_null_mod_init(void)
  157 {
  158         int ret = 0;
  159 
  160         ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs));
  161         if (ret < 0)
  162                 goto out;
  163 
  164         ret = crypto_register_shash(&digest_null);
  165         if (ret < 0)
  166                 goto out_unregister_algs;
  167 
  168         return 0;
  169 
  170 out_unregister_algs:
  171         crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
  172 out:
  173         return ret;
  174 }
  175 
  176 static void __exit crypto_null_mod_fini(void)
  177 {
  178         crypto_unregister_shash(&digest_null);
  179         crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
  180 }
  181 
  182 module_init(crypto_null_mod_init);
  183 module_exit(crypto_null_mod_fini);
  184 
  185 MODULE_LICENSE("GPL");
  186 MODULE_DESCRIPTION("Null Cryptographic Algorithms");

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FreeBSD/Linux Kernel Cross Reference sys/crypto/crypto_null.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/crypto_null.c