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

   1 /*
   2  * Copyright (c) 1997 - 2007 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: data.c 22064 2007-11-11 16:28:14Z lha $"
  37         "$NetBSD$");
  38
  39 /**
  40  * Reset the (potentially uninitalized) krb5_data structure.
  41  *
  42  * @param p krb5_data to reset.
  43  *
  44  * @ingroup krb5
  45  */
  46
  47 void KRB5_LIB_FUNCTION
  48 krb5_data_zero(krb5_data *p)
  49 {
  50     p->length = 0;
  51     p->data   = NULL;
  52 }
  53
  54 /**
  55  * Free the content of krb5_data structure, its ok to free a zeroed
  56  * structure. When done, the structure will be zeroed.
  57  *
  58  * @param p krb5_data to free.
  59  *
  60  * @ingroup krb5
  61  */
  62
  63 void KRB5_LIB_FUNCTION
  64 krb5_data_free(krb5_data *p)
  65 {
  66     if(p->data != NULL)
  67         free(p->data);
  68     krb5_data_zero(p);
  69 }
  70
  71 /**
  72  * Same as krb5_data_free().
  73  *
  74  * @param context Kerberos 5 context.
  75  * @param data krb5_data to free.
  76  *
  77  * @ingroup krb5
  78  */
  79
  80 void KRB5_LIB_FUNCTION
  81 krb5_free_data_contents(krb5_context context, krb5_data *data)
  82 {
  83     krb5_data_free(data);
  84 }
  85
  86 /**
  87  * Free krb5_data (and its content).
  88  *
  89  * @param context Kerberos 5 context.
  90  * @param p krb5_data to free.
  91  *
  92  * @ingroup krb5
  93  */
  94
  95 void KRB5_LIB_FUNCTION
  96 krb5_free_data(krb5_context context,
  97                krb5_data *p)
  98 {
  99     krb5_data_free(p);
 100     free(p);
 101 }
 102
 103 /**
 104  * Allocate data of and krb5_data.
 105  *
 106  * @param p krb5_data to free.
 107  * @param len size to allocate.
 108  *
 109  * @return Returns 0 to indicate success. Otherwise an kerberos et
 110  * error code is returned.
 111  *
 112  * @ingroup krb5
 113  */
 114
 115 krb5_error_code KRB5_LIB_FUNCTION
 116 krb5_data_alloc(krb5_data *p, int len)
 117 {
 118     p->data = malloc(len);
 119     if(len && p->data == NULL)
 120         return ENOMEM;
 121     p->length = len;
 122     return 0;
 123 }
 124
 125 /**
 126  * Grow (or shrink) the content of krb5_data to a new size.
 127  *
 128  * @param p krb5_data to free.
 129  * @param len new size.
 130  *
 131  * @return Returns 0 to indicate success. Otherwise an kerberos et
 132  * error code is returned.
 133  *
 134  * @ingroup krb5
 135  */
 136
 137 krb5_error_code KRB5_LIB_FUNCTION
 138 krb5_data_realloc(krb5_data *p, int len)
 139 {
 140     void *tmp;
 141     tmp = realloc(p->data, len);
 142     if(len && !tmp)
 143         return ENOMEM;
 144     p->data = tmp;
 145     p->length = len;
 146     return 0;
 147 }
 148
 149 /**
 150  * Copy the data of len into the krb5_data.
 151  *
 152  * @param p krb5_data to copy into.
 153  * @param data data to copy..
 154  * @param len new size.
 155  *
 156  * @return Returns 0 to indicate success. Otherwise an kerberos et
 157  * error code is returned.
 158  *
 159  * @ingroup krb5
 160  */
 161
 162 krb5_error_code KRB5_LIB_FUNCTION
 163 krb5_data_copy(krb5_data *p, const void *data, size_t len)
 164 {
 165     if (len) {
 166         if(krb5_data_alloc(p, len))
 167             return ENOMEM;
 168         memmove(p->data, data, len);
 169     } else
 170         p->data = NULL;
 171     p->length = len;
 172     return 0;
 173 }
 174
 175 /**
 176  * Copy the data into a newly allocated krb5_data.
 177  *
 178  * @param context Kerberos 5 context.
 179  * @param indata the krb5_data data to copy
 180  * @param outdata new krb5_date to copy too. Free with krb5_free_data().
 181  *
 182  * @return Returns 0 to indicate success. Otherwise an kerberos et
 183  * error code is returned.
 184  *
 185  * @ingroup krb5
 186  */
 187
 188 krb5_error_code KRB5_LIB_FUNCTION
 189 krb5_copy_data(krb5_context context,
 190                const krb5_data *indata,
 191                krb5_data **outdata)
 192 {
 193     krb5_error_code ret;
 194     ALLOC(*outdata, 1);
 195     if(*outdata == NULL) {
 196         krb5_set_error_string(context, "malloc: out of memory");
 197         return ENOMEM;
 198     }
 199     ret = der_copy_octet_string(indata, *outdata);
 200     if(ret) {
 201         krb5_clear_error_string (context);
 202         free(*outdata);
 203         *outdata = NULL;
 204     }
 205     return ret;
 206 }
 207
 208 /**
 209  * Compare to data.
 210  *
 211  * @param data1 krb5_data to compare
 212  * @param data2 krb5_data to compare
 213  *
 214  * @return return the same way as memcmp(), useful when sorting.
 215  *
 216  * @ingroup krb5
 217  */
 218
 219 int KRB5_LIB_FUNCTION
 220 krb5_data_cmp(const krb5_data *data1, const krb5_data *data2)
 221 {
 222     if (data1->length != data2->length)
 223         return data1->length - data2->length;
 224     return memcmp(data1->data, data2->data, data1->length);
 225 }