drivers/staging/rtl8192u/ieee80211/api.c

   1 /*
   2  * Scatterlist Cryptographic API.
   3  *
   4  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   5  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
   6  *
   7  * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
   8  * and Nettle, by Niels M鰈ler.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  *
  15  */
  16 #include "kmap_types.h"
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 //#include <linux/crypto.h>
  21 #include "rtl_crypto.h"
  22 #include <linux/errno.h>
  23 #include <linux/rwsem.h>
  24 #include <linux/slab.h>
  25 #include "internal.h"
  26
  27 LIST_HEAD(crypto_alg_list);
  28 DECLARE_RWSEM(crypto_alg_sem);
  29
  30 static inline int crypto_alg_get(struct crypto_alg *alg)
  31 {
  32         return try_inc_mod_count(alg->cra_module);
  33 }
  34
  35 static inline void crypto_alg_put(struct crypto_alg *alg)
  36 {
  37         if (alg->cra_module)
  38                 __MOD_DEC_USE_COUNT(alg->cra_module);
  39 }
  40
  41 struct crypto_alg *crypto_alg_lookup(const char *name)
  42 {
  43         struct crypto_alg *q, *alg = NULL;
  44
  45         if (!name)
  46                 return NULL;
  47
  48         down_read(&crypto_alg_sem);
  49
  50         list_for_each_entry(q, &crypto_alg_list, cra_list) {
  51                 if (!(strcmp(q->cra_name, name))) {
  52                         if (crypto_alg_get(q))
  53                                 alg = q;
  54                         break;
  55                 }
  56         }
  57
  58         up_read(&crypto_alg_sem);
  59         return alg;
  60 }
  61
  62 static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags)
  63 {
  64         tfm->crt_flags = 0;
  65
  66         switch (crypto_tfm_alg_type(tfm)) {
  67         case CRYPTO_ALG_TYPE_CIPHER:
  68                 return crypto_init_cipher_flags(tfm, flags);
  69
  70         case CRYPTO_ALG_TYPE_DIGEST:
  71                 return crypto_init_digest_flags(tfm, flags);
  72
  73         case CRYPTO_ALG_TYPE_COMPRESS:
  74                 return crypto_init_compress_flags(tfm, flags);
  75
  76         default:
  77                 break;
  78         }
  79
  80         BUG();
  81         return -EINVAL;
  82 }
  83
  84 static int crypto_init_ops(struct crypto_tfm *tfm)
  85 {
  86         switch (crypto_tfm_alg_type(tfm)) {
  87         case CRYPTO_ALG_TYPE_CIPHER:
  88                 return crypto_init_cipher_ops(tfm);
  89
  90         case CRYPTO_ALG_TYPE_DIGEST:
  91                 return crypto_init_digest_ops(tfm);
  92
  93         case CRYPTO_ALG_TYPE_COMPRESS:
  94                 return crypto_init_compress_ops(tfm);
  95
  96         default:
  97                 break;
  98         }
  99
 100         BUG();
 101         return -EINVAL;
 102 }
 103
 104 static void crypto_exit_ops(struct crypto_tfm *tfm)
 105 {
 106         switch (crypto_tfm_alg_type(tfm)) {
 107         case CRYPTO_ALG_TYPE_CIPHER:
 108                 crypto_exit_cipher_ops(tfm);
 109                 break;
 110
 111         case CRYPTO_ALG_TYPE_DIGEST:
 112                 crypto_exit_digest_ops(tfm);
 113                 break;
 114
 115         case CRYPTO_ALG_TYPE_COMPRESS:
 116                 crypto_exit_compress_ops(tfm);
 117                 break;
 118
 119         default:
 120                 BUG();
 121
 122         }
 123 }
 124
 125 struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
 126 {
 127         struct crypto_tfm *tfm = NULL;
 128         struct crypto_alg *alg;
 129
 130         alg = crypto_alg_mod_lookup(name);
 131         if (alg == NULL)
 132                 goto out;
 133
 134         tfm = kzalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
 135         if (tfm == NULL)
 136                 goto out_put;
 137
 138         tfm->__crt_alg = alg;
 139
 140         if (crypto_init_flags(tfm, flags))
 141                 goto out_free_tfm;
 142
 143         if (crypto_init_ops(tfm)) {
 144                 crypto_exit_ops(tfm);
 145                 goto out_free_tfm;
 146         }
 147
 148         goto out;
 149
 150 out_free_tfm:
 151         kfree(tfm);
 152         tfm = NULL;
 153 out_put:
 154         crypto_alg_put(alg);
 155 out:
 156         return tfm;
 157 }
 158
 159 void crypto_free_tfm(struct crypto_tfm *tfm)
 160 {
 161         struct crypto_alg *alg = tfm->__crt_alg;
 162         int size = sizeof(*tfm) + alg->cra_ctxsize;
 163
 164         crypto_exit_ops(tfm);
 165         crypto_alg_put(alg);
 166         memset(tfm, 0, size);
 167         kfree(tfm);
 168 }
 169
 170 int crypto_register_alg(struct crypto_alg *alg)
 171 {
 172         int ret = 0;
 173         struct crypto_alg *q;
 174
 175         down_write(&crypto_alg_sem);
 176
 177         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 178                 if (!(strcmp(q->cra_name, alg->cra_name))) {
 179                         ret = -EEXIST;
 180                         goto out;
 181                 }
 182         }
 183
 184         list_add_tail(&alg->cra_list, &crypto_alg_list);
 185 out:
 186         up_write(&crypto_alg_sem);
 187         return ret;
 188 }
 189
 190 int crypto_unregister_alg(struct crypto_alg *alg)
 191 {
 192         int ret = -ENOENT;
 193         struct crypto_alg *q;
 194
 195         BUG_ON(!alg->cra_module);
 196
 197         down_write(&crypto_alg_sem);
 198         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 199                 if (alg == q) {
 200                         list_del(&alg->cra_list);
 201                         ret = 0;
 202                         goto out;
 203                 }
 204         }
 205 out:
 206         up_write(&crypto_alg_sem);
 207         return ret;
 208 }
 209
 210 int crypto_alg_available(const char *name, u32 flags)
 211 {
 212         int ret = 0;
 213         struct crypto_alg *alg = crypto_alg_mod_lookup(name);
 214
 215         if (alg) {
 216                 crypto_alg_put(alg);
 217                 ret = 1;
 218         }
 219
 220         return ret;
 221 }
 222
 223 static int __init init_crypto(void)
 224 {
 225         printk(KERN_INFO "Initializing Cryptographic API\n");
 226         crypto_init_proc();
 227         return 0;
 228 }
 229
 230 __initcall(init_crypto);
 231
 232 /*
 233 EXPORT_SYMBOL_GPL(crypto_register_alg);
 234 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 235 EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
 236 EXPORT_SYMBOL_GPL(crypto_free_tfm);
 237 EXPORT_SYMBOL_GPL(crypto_alg_available);
 238 */
 239
 240 EXPORT_SYMBOL_NOVERS(crypto_register_alg);
 241 EXPORT_SYMBOL_NOVERS(crypto_unregister_alg);
 242 EXPORT_SYMBOL_NOVERS(crypto_alloc_tfm);
 243 EXPORT_SYMBOL_NOVERS(crypto_free_tfm);
 244 EXPORT_SYMBOL_NOVERS(crypto_alg_available);