1/*	$NetBSD: data.c,v 1.2 2017/01/28 21:31:49 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997 - 2007 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "krb5_locl.h"
37
38/**
39 * Reset the (potentially uninitalized) krb5_data structure.
40 *
41 * @param p krb5_data to reset.
42 *
43 * @ingroup krb5
44 */
45
46KRB5_LIB_FUNCTION void KRB5_LIB_CALL
47krb5_data_zero(krb5_data *p)
48{
49    p->length = 0;
50    p->data   = NULL;
51}
52
53/**
54 * Free the content of krb5_data structure, its ok to free a zeroed
55 * structure (with memset() or krb5_data_zero()). When done, the
56 * structure will be zeroed. The same function is called
57 * krb5_free_data_contents() in MIT Kerberos.
58 *
59 * @param p krb5_data to free.
60 *
61 * @ingroup krb5
62 */
63
64KRB5_LIB_FUNCTION void KRB5_LIB_CALL
65krb5_data_free(krb5_data *p)
66{
67    free(p->data);
68    krb5_data_zero(p);
69}
70
71/**
72 * Free krb5_data (and its content).
73 *
74 * @param context Kerberos 5 context.
75 * @param p krb5_data to free.
76 *
77 * @ingroup krb5
78 */
79
80KRB5_LIB_FUNCTION void KRB5_LIB_CALL
81krb5_free_data(krb5_context context,
82	       krb5_data *p)
83{
84    krb5_data_free(p);
85    free(p);
86}
87
88/**
89 * Allocate data of and krb5_data.
90 *
91 * @param p krb5_data to allocate.
92 * @param len size to allocate.
93 *
94 * @return Returns 0 to indicate success. Otherwise an kerberos et
95 * error code is returned.
96 *
97 * @ingroup krb5
98 */
99
100KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
101krb5_data_alloc(krb5_data *p, int len)
102{
103    p->data = malloc(len);
104    if(len && p->data == NULL)
105	return ENOMEM;
106    p->length = len;
107    return 0;
108}
109
110/**
111 * Grow (or shrink) the content of krb5_data to a new size.
112 *
113 * @param p krb5_data to free.
114 * @param len new size.
115 *
116 * @return Returns 0 to indicate success. Otherwise an kerberos et
117 * error code is returned.
118 *
119 * @ingroup krb5
120 */
121
122KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
123krb5_data_realloc(krb5_data *p, int len)
124{
125    void *tmp;
126    tmp = realloc(p->data, len);
127    if(len && !tmp)
128	return ENOMEM;
129    p->data = tmp;
130    p->length = len;
131    return 0;
132}
133
134/**
135 * Copy the data of len into the krb5_data.
136 *
137 * @param p krb5_data to copy into.
138 * @param data data to copy..
139 * @param len new size.
140 *
141 * @return Returns 0 to indicate success. Otherwise an kerberos et
142 * error code is returned.
143 *
144 * @ingroup krb5
145 */
146
147KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
148krb5_data_copy(krb5_data *p, const void *data, size_t len)
149{
150    if (len) {
151	if(krb5_data_alloc(p, len))
152	    return ENOMEM;
153	memmove(p->data, data, len);
154    } else
155	p->data = NULL;
156    p->length = len;
157    return 0;
158}
159
160/**
161 * Copy the data into a newly allocated krb5_data.
162 *
163 * @param context Kerberos 5 context.
164 * @param indata the krb5_data data to copy
165 * @param outdata new krb5_date to copy too. Free with krb5_free_data().
166 *
167 * @return Returns 0 to indicate success. Otherwise an kerberos et
168 * error code is returned.
169 *
170 * @ingroup krb5
171 */
172
173KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
174krb5_copy_data(krb5_context context,
175	       const krb5_data *indata,
176	       krb5_data **outdata)
177{
178    krb5_error_code ret;
179    ALLOC(*outdata, 1);
180    if(*outdata == NULL)
181	return krb5_enomem(context);
182    ret = der_copy_octet_string(indata, *outdata);
183    if(ret) {
184	krb5_clear_error_message (context);
185	free(*outdata);
186	*outdata = NULL;
187    }
188    return ret;
189}
190
191/**
192 * Compare to data.
193 *
194 * @param data1 krb5_data to compare
195 * @param data2 krb5_data to compare
196 *
197 * @return return the same way as memcmp(), useful when sorting.
198 *
199 * @ingroup krb5
200 */
201
202KRB5_LIB_FUNCTION int KRB5_LIB_CALL
203krb5_data_cmp(const krb5_data *data1, const krb5_data *data2)
204{
205    if (data1->length != data2->length)
206	return data1->length - data2->length;
207    return memcmp(data1->data, data2->data, data1->length);
208}
209
210/**
211 * Compare to data not exposing timing information from the checksum data
212 *
213 * @param data1 krb5_data to compare
214 * @param data2 krb5_data to compare
215 *
216 * @return returns zero for same data, otherwise non zero.
217 *
218 * @ingroup krb5
219 */
220
221KRB5_LIB_FUNCTION int KRB5_LIB_CALL
222krb5_data_ct_cmp(const krb5_data *data1, const krb5_data *data2)
223{
224    if (data1->length != data2->length)
225	return data1->length - data2->length;
226    return ct_memcmp(data1->data, data2->data, data1->length);
227}
228