xref: /freebsd/crypto/heimdal/lib/krb5/data.c (revision 6a068746777241722b2b32c5d0bc443a2a64d80b)
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 /**
37  * Reset the (potentially uninitalized) krb5_data structure.
38  *
39  * @param p krb5_data to reset.
40  *
41  * @ingroup krb5
42  */
43 
44 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_data_zero(krb5_data * p)45 krb5_data_zero(krb5_data *p)
46 {
47     p->length = 0;
48     p->data   = NULL;
49 }
50 
51 /**
52  * Free the content of krb5_data structure, its ok to free a zeroed
53  * structure (with memset() or krb5_data_zero()). When done, the
54  * structure will be zeroed. The same function is called
55  * krb5_free_data_contents() in MIT Kerberos.
56  *
57  * @param p krb5_data to free.
58  *
59  * @ingroup krb5
60  */
61 
62 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_data_free(krb5_data * p)63 krb5_data_free(krb5_data *p)
64 {
65     if(p->data != NULL)
66 	free(p->data);
67     krb5_data_zero(p);
68 }
69 
70 /**
71  * Free krb5_data (and its content).
72  *
73  * @param context Kerberos 5 context.
74  * @param p krb5_data to free.
75  *
76  * @ingroup krb5
77  */
78 
79 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_data(krb5_context context,krb5_data * p)80 krb5_free_data(krb5_context context,
81 	       krb5_data *p)
82 {
83     krb5_data_free(p);
84     free(p);
85 }
86 
87 /**
88  * Allocate data of and krb5_data.
89  *
90  * @param p krb5_data to allocate.
91  * @param len size to allocate.
92  *
93  * @return Returns 0 to indicate success. Otherwise an kerberos et
94  * error code is returned.
95  *
96  * @ingroup krb5
97  */
98 
99 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_data_alloc(krb5_data * p,int len)100 krb5_data_alloc(krb5_data *p, int len)
101 {
102     p->data = malloc(len);
103     if(len && p->data == NULL)
104 	return ENOMEM;
105     p->length = len;
106     return 0;
107 }
108 
109 /**
110  * Grow (or shrink) the content of krb5_data to a new size.
111  *
112  * @param p krb5_data to free.
113  * @param len new size.
114  *
115  * @return Returns 0 to indicate success. Otherwise an kerberos et
116  * error code is returned.
117  *
118  * @ingroup krb5
119  */
120 
121 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_data_realloc(krb5_data * p,int len)122 krb5_data_realloc(krb5_data *p, int len)
123 {
124     void *tmp;
125     tmp = realloc(p->data, len);
126     if(len && !tmp)
127 	return ENOMEM;
128     p->data = tmp;
129     p->length = len;
130     return 0;
131 }
132 
133 /**
134  * Copy the data of len into the krb5_data.
135  *
136  * @param p krb5_data to copy into.
137  * @param data data to copy..
138  * @param len new size.
139  *
140  * @return Returns 0 to indicate success. Otherwise an kerberos et
141  * error code is returned.
142  *
143  * @ingroup krb5
144  */
145 
146 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_data_copy(krb5_data * p,const void * data,size_t len)147 krb5_data_copy(krb5_data *p, const void *data, size_t len)
148 {
149     if (len) {
150 	if(krb5_data_alloc(p, len))
151 	    return ENOMEM;
152 	memmove(p->data, data, len);
153     } else
154 	p->data = NULL;
155     p->length = len;
156     return 0;
157 }
158 
159 /**
160  * Copy the data into a newly allocated krb5_data.
161  *
162  * @param context Kerberos 5 context.
163  * @param indata the krb5_data data to copy
164  * @param outdata new krb5_date to copy too. Free with krb5_free_data().
165  *
166  * @return Returns 0 to indicate success. Otherwise an kerberos et
167  * error code is returned.
168  *
169  * @ingroup krb5
170  */
171 
172 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_data(krb5_context context,const krb5_data * indata,krb5_data ** outdata)173 krb5_copy_data(krb5_context context,
174 	       const krb5_data *indata,
175 	       krb5_data **outdata)
176 {
177     krb5_error_code ret;
178     ALLOC(*outdata, 1);
179     if(*outdata == NULL) {
180 	krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
181 	return ENOMEM;
182     }
183     ret = der_copy_octet_string(indata, *outdata);
184     if(ret) {
185 	krb5_clear_error_message (context);
186 	free(*outdata);
187 	*outdata = NULL;
188     }
189     return ret;
190 }
191 
192 /**
193  * Compare to data.
194  *
195  * @param data1 krb5_data to compare
196  * @param data2 krb5_data to compare
197  *
198  * @return return the same way as memcmp(), useful when sorting.
199  *
200  * @ingroup krb5
201  */
202 
203 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
krb5_data_cmp(const krb5_data * data1,const krb5_data * data2)204 krb5_data_cmp(const krb5_data *data1, const krb5_data *data2)
205 {
206     if (data1->length != data2->length)
207 	return data1->length - data2->length;
208     return memcmp(data1->data, data2->data, data1->length);
209 }
210 
211 /**
212  * Compare to data not exposing timing information from the checksum data
213  *
214  * @param data1 krb5_data to compare
215  * @param data2 krb5_data to compare
216  *
217  * @return returns zero for same data, otherwise non zero.
218  *
219  * @ingroup krb5
220  */
221 
222 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
krb5_data_ct_cmp(const krb5_data * data1,const krb5_data * data2)223 krb5_data_ct_cmp(const krb5_data *data1, const krb5_data *data2)
224 {
225     if (data1->length != data2->length)
226 	return data1->length - data2->length;
227     return ct_memcmp(data1->data, data2->data, data1->length);
228 }
229