crypto/ablkcipher.c

   1 /*
   2  * Asynchronous block chaining cipher operations.
   3  *
   4  * This is the asynchronous version of blkcipher.c indicating completion
   5  * via a callback.
   6  *
   7  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the Free
  11  * Software Foundation; either version 2 of the License, or (at your option)
  12  * any later version.
  13  *
  14  */
  15
  16 #include <crypto/algapi.h>
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/seq_file.h>
  21
  22 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
  23                   unsigned int keylen)
  24 {
  25         struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
  26
  27         if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
  28                 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
  29                 return -EINVAL;
  30         }
  31
  32         return cipher->setkey(tfm, key, keylen);
  33 }
  34
  35 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
  36                                               u32 mask)
  37 {
  38         return alg->cra_ctxsize;
  39 }
  40
  41 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
  42                                       u32 mask)
  43 {
  44         struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
  45         struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
  46
  47         if (alg->ivsize > PAGE_SIZE / 8)
  48                 return -EINVAL;
  49
  50         crt->setkey = setkey;
  51         crt->encrypt = alg->encrypt;
  52         crt->decrypt = alg->decrypt;
  53         crt->ivsize = alg->ivsize;
  54
  55         return 0;
  56 }
  57
  58 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
  59         __attribute__ ((unused));
  60 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
  61 {
  62         struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
  63
  64         seq_printf(m, "type         : ablkcipher\n");
  65         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  66         seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
  67         seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
  68         seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
  69         seq_printf(m, "qlen         : %u\n", ablkcipher->queue->qlen);
  70         seq_printf(m, "max qlen     : %u\n", ablkcipher->queue->max_qlen);
  71 }
  72
  73 const struct crypto_type crypto_ablkcipher_type = {
  74         .ctxsize = crypto_ablkcipher_ctxsize,
  75         .init = crypto_init_ablkcipher_ops,
  76 #ifdef CONFIG_PROC_FS
  77         .show = crypto_ablkcipher_show,
  78 #endif
  79 };
  80 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
  81
  82 MODULE_LICENSE("GPL");
  83 MODULE_DESCRIPTION("Asynchronous block chaining cipher type");