crypto/arc4.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API
   4  *
   5  * ARC4 Cipher Algorithm
   6  *
   7  * Jon Oberheide <jon@oberheide.org>
   8  */
   9
  10 #include <crypto/arc4.h>
  11 #include <crypto/internal/skcipher.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/sched.h>
  16
  17 static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,
  18                               unsigned int key_len)
  19 {
  20         struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
  21
  22         return arc4_setkey(ctx, in_key, key_len);
  23 }
  24
  25 static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,
  26                              u8 *dst, unsigned nbytes, u8 *iv, bool final)
  27 {
  28         struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
  29
  30         arc4_crypt(ctx, dst, src, nbytes);
  31         return 0;
  32 }
  33
  34 static int crypto_arc4_init(struct crypto_lskcipher *tfm)
  35 {
  36         pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
  37                             current->comm, (unsigned long)current->pid);
  38
  39         return 0;
  40 }
  41
  42 static struct lskcipher_alg arc4_alg = {
  43         .co.base.cra_name               =       "arc4",
  44         .co.base.cra_driver_name        =       "arc4-generic",
  45         .co.base.cra_priority           =       100,
  46         .co.base.cra_blocksize          =       ARC4_BLOCK_SIZE,
  47         .co.base.cra_ctxsize            =       sizeof(struct arc4_ctx),
  48         .co.base.cra_module             =       THIS_MODULE,
  49         .co.min_keysize                 =       ARC4_MIN_KEY_SIZE,
  50         .co.max_keysize                 =       ARC4_MAX_KEY_SIZE,
  51         .setkey                         =       crypto_arc4_setkey,
  52         .encrypt                        =       crypto_arc4_crypt,
  53         .decrypt                        =       crypto_arc4_crypt,
  54         .init                           =       crypto_arc4_init,
  55 };
  56
  57 static int __init arc4_init(void)
  58 {
  59         return crypto_register_lskcipher(&arc4_alg);
  60 }
  61
  62 static void __exit arc4_exit(void)
  63 {
  64         crypto_unregister_lskcipher(&arc4_alg);
  65 }
  66
  67 subsys_initcall(arc4_init);
  68 module_exit(arc4_exit);
  69
  70 MODULE_LICENSE("GPL");
  71 MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
  72 MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
  73 MODULE_ALIAS_CRYPTO("ecb(arc4)");