src/crypto/hcrypto/kernel/alloc.c

   1 /*
   2  * Copyright (c) 2010 Your File System Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include "config.h"
  26
  27 void *
  28 _afscrypto_calloc(int num, size_t len)
  29 {
  30     void *ptr;
  31     size_t total;
  32
  33     total = num * len;
  34     ptr = afs_osi_Alloc(total);
  35     /* In practice, callers assume the afs_osi_Alloc() will not fail. */
  36     if (ptr != NULL)
  37         memset(ptr, 0, total);
  38
  39     return ptr;
  40 }
  41
  42 void *
  43 _afscrypto_malloc(size_t len)
  44 {
  45     void *ptr;
  46
  47     ptr = afs_osi_Alloc(len);
  48
  49     return ptr;
  50 }
  51
  52 void
  53 _afscrypto_free(void *ptr)
  54 {
  55     if (ptr != NULL)
  56         afs_osi_Free(ptr, 0);
  57 }
  58
  59 char*
  60 _afscrypto_strdup(const char *str) {
  61     char *ptr;
  62
  63     ptr = malloc(strlen(str) + 1);
  64     if (ptr == NULL)
  65        return ptr;
  66     memcpy(ptr, str, strlen(str) + 1);
  67
  68     return ptr;
  69 }
  70
  71 /* This is a horrible, horrible bodge, but the crypto code uses realloc,
  72  * so we need to handle it too.
  73  *
  74  * There are two different call sites for realloc. Firstly, it's used
  75  * in the decrypt case to shrink the size of the allotted buffer. In
  76  * this case, we can just ignore the realloc and return the original
  77  * pointer.
  78  *
  79  * Secondly, it's used when computing derived keys. In this case, the
  80  * first call will be with a NULL input, and the size of a single
  81  * derived key. So, we just give back space for 20 keys, and pray.
  82  */
  83
  84 void *
  85 _afscrypto_realloc(void *ptr, size_t len) {
  86    if (ptr == NULL)
  87         return calloc(20, len);
  88    return ptr;
  89 }