crypto/dist/heimdal/lib/krb5/keyblock.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 __RCSID("$Heimdal: keyblock.c 15167 2005-05-18 04:21:57Z lha $"
  37         "$NetBSD: keyblock.c,v 1.3 2008/03/22 08:37:13 mlelstv Exp $");
  38
  39 void KRB5_LIB_FUNCTION
  40 krb5_keyblock_zero(krb5_keyblock *keyblock)
  41 {
  42     keyblock->keytype = 0;
  43     krb5_data_zero(&keyblock->keyvalue);
  44 }
  45
  46 void KRB5_LIB_FUNCTION
  47 krb5_free_keyblock_contents(krb5_context context,
  48                             krb5_keyblock *keyblock)
  49 {
  50     if(keyblock) {
  51         if (keyblock->keyvalue.data != NULL)
  52             memset(keyblock->keyvalue.data, 0, keyblock->keyvalue.length);
  53         krb5_data_free (&keyblock->keyvalue);
  54         keyblock->keytype = ENCTYPE_NULL;
  55     }
  56 }
  57
  58 void KRB5_LIB_FUNCTION
  59 krb5_free_keyblock(krb5_context context,
  60                    krb5_keyblock *keyblock)
  61 {
  62     if(keyblock){
  63         krb5_free_keyblock_contents(context, keyblock);
  64         free(keyblock);
  65     }
  66 }
  67
  68 krb5_error_code KRB5_LIB_FUNCTION
  69 krb5_copy_keyblock_contents (krb5_context context,
  70                              const krb5_keyblock *inblock,
  71                              krb5_keyblock *to)
  72 {
  73     return copy_EncryptionKey(inblock, to);
  74 }
  75
  76 /* coverity[+alloc : arg-*2] */
  77 krb5_error_code KRB5_LIB_FUNCTION
  78 krb5_copy_keyblock (krb5_context context,
  79                     const krb5_keyblock *inblock,
  80                     krb5_keyblock **to)
  81 {
  82     krb5_keyblock *k;
  83
  84     k = malloc (sizeof(*k));
  85     if (k == NULL) {
  86         krb5_set_error_string(context, "malloc: out of memory");
  87         return ENOMEM;
  88     }
  89     *to = k;
  90     return krb5_copy_keyblock_contents (context, inblock, k);
  91 }
  92
  93 krb5_enctype
  94 krb5_keyblock_get_enctype(const krb5_keyblock *block)
  95 {
  96     return block->keytype;
  97 }
  98
  99 /*
 100  * Fill in `key' with key data of type `enctype' from `data' of length
 101  * `size'. Key should be freed using krb5_free_keyblock_contents.
 102  */
 103
 104 krb5_error_code KRB5_LIB_FUNCTION
 105 krb5_keyblock_init(krb5_context context,
 106                    krb5_enctype type,
 107                    const void *data,
 108                    size_t size,
 109                    krb5_keyblock *key)
 110 {
 111     krb5_error_code ret;
 112     size_t len;
 113
 114     memset(key, 0, sizeof(*key));
 115
 116     ret = krb5_enctype_keysize(context, type, &len);
 117     if (ret)
 118         return ret;
 119
 120     if (len != size) {
 121         krb5_set_error_string(context, "Encryption key %d is %lu bytes "
 122                               "long, %lu was passed in",
 123                               type, (unsigned long)len, (unsigned long)size);
 124         return KRB5_PROG_ETYPE_NOSUPP;
 125     }
 126     ret = krb5_data_copy(&key->keyvalue, data, len);
 127     if(ret) {
 128         krb5_set_error_string(context, "malloc failed: %lu",
 129                               (unsigned long)len);
 130         return ret;
 131     }
 132     key->keytype = type;
 133
 134     return 0;
 135 }