Line data Source code
1 : /* crypto/buffer/buffer.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : * All rights reserved.
4 : *
5 : * This package is an SSL implementation written
6 : * by Eric Young (eay@cryptsoft.com).
7 : * The implementation was written so as to conform with Netscapes SSL.
8 : *
9 : * This library is free for commercial and non-commercial use as long as
10 : * the following conditions are aheared to. The following conditions
11 : * apply to all code found in this distribution, be it the RC4, RSA,
12 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : * included with this distribution is covered by the same copyright terms
14 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : *
16 : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : * the code are not to be removed.
18 : * If this package is used in a product, Eric Young should be given attribution
19 : * as the author of the parts of the library used.
20 : * This can be in the form of a textual message at program startup or
21 : * in documentation (online or textual) provided with the package.
22 : *
23 : * Redistribution and use in source and binary forms, with or without
24 : * modification, are permitted provided that the following conditions
25 : * are met:
26 : * 1. Redistributions of source code must retain the copyright
27 : * notice, this list of conditions and the following disclaimer.
28 : * 2. Redistributions in binary form must reproduce the above copyright
29 : * notice, this list of conditions and the following disclaimer in the
30 : * documentation and/or other materials provided with the distribution.
31 : * 3. All advertising materials mentioning features or use of this software
32 : * must display the following acknowledgement:
33 : * "This product includes cryptographic software written by
34 : * Eric Young (eay@cryptsoft.com)"
35 : * The word 'cryptographic' can be left out if the rouines from the library
36 : * being used are not cryptographic related :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
41 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : * SUCH DAMAGE.
52 : *
53 : * The licence and distribution terms for any publically available version or
54 : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : * copied and put under another distribution licence
56 : * [including the GNU Public Licence.]
57 : */
58 :
59 : #include <stdio.h>
60 : #include "cryptlib.h"
61 : #include <openssl/buffer.h>
62 :
63 : /*
64 : * LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That
65 : * function is applied in several functions in this file and this limit
66 : * ensures that the result fits in an int.
67 : */
68 : #define LIMIT_BEFORE_EXPANSION 0x5ffffffc
69 :
70 21057 : BUF_MEM *BUF_MEM_new(void)
71 : {
72 : BUF_MEM *ret;
73 :
74 21057 : ret = OPENSSL_malloc(sizeof(BUF_MEM));
75 21057 : if (ret == NULL) {
76 0 : BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE);
77 0 : return (NULL);
78 : }
79 21057 : ret->length = 0;
80 21057 : ret->max = 0;
81 21057 : ret->data = NULL;
82 21057 : return (ret);
83 : }
84 :
85 14093 : void BUF_MEM_free(BUF_MEM *a)
86 : {
87 14093 : if (a == NULL)
88 14093 : return;
89 :
90 14093 : if (a->data != NULL) {
91 6356 : OPENSSL_cleanse(a->data, a->max);
92 6356 : OPENSSL_free(a->data);
93 : }
94 14093 : OPENSSL_free(a);
95 : }
96 :
97 44514 : int BUF_MEM_grow(BUF_MEM *str, size_t len)
98 : {
99 : char *ret;
100 : size_t n;
101 :
102 44514 : if (str->length >= len) {
103 3442 : str->length = len;
104 3442 : return (len);
105 : }
106 41072 : if (str->max >= len) {
107 25152 : memset(&str->data[str->length], 0, len - str->length);
108 25152 : str->length = len;
109 25152 : return (len);
110 : }
111 : /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
112 15920 : if (len > LIMIT_BEFORE_EXPANSION) {
113 0 : BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
114 0 : return 0;
115 : }
116 15920 : n = (len + 3) / 3 * 4;
117 15920 : if (str->data == NULL)
118 11072 : ret = OPENSSL_malloc(n);
119 : else
120 4848 : ret = OPENSSL_realloc(str->data, n);
121 15920 : if (ret == NULL) {
122 0 : BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
123 : len = 0;
124 : } else {
125 15920 : str->data = ret;
126 15920 : str->max = n;
127 15920 : memset(&str->data[str->length], 0, len - str->length);
128 15920 : str->length = len;
129 : }
130 15920 : return (len);
131 : }
132 :
133 24884 : int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
134 : {
135 : char *ret;
136 : size_t n;
137 :
138 24884 : if (str->length >= len) {
139 8771 : memset(&str->data[len], 0, str->length - len);
140 8771 : str->length = len;
141 8771 : return (len);
142 : }
143 16113 : if (str->max >= len) {
144 12386 : memset(&str->data[str->length], 0, len - str->length);
145 12386 : str->length = len;
146 12386 : return (len);
147 : }
148 : /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
149 3727 : if (len > LIMIT_BEFORE_EXPANSION) {
150 0 : BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
151 0 : return 0;
152 : }
153 3727 : n = (len + 3) / 3 * 4;
154 3727 : if (str->data == NULL)
155 2248 : ret = OPENSSL_malloc(n);
156 : else
157 1479 : ret = OPENSSL_realloc_clean(str->data, str->max, n);
158 3727 : if (ret == NULL) {
159 0 : BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
160 : len = 0;
161 : } else {
162 3727 : str->data = ret;
163 3727 : str->max = n;
164 3727 : memset(&str->data[str->length], 0, len - str->length);
165 3727 : str->length = len;
166 : }
167 3727 : return (len);
168 : }
169 :
170 0 : void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
171 : {
172 : size_t i;
173 0 : if (in) {
174 0 : out += size - 1;
175 0 : for (i = 0; i < size; i++)
176 0 : *out-- = *in++;
177 : } else {
178 : unsigned char *q;
179 : char c;
180 0 : q = out + size - 1;
181 0 : for (i = 0; i < size / 2; i++) {
182 0 : c = *q;
183 0 : *q-- = *out;
184 0 : *out++ = c;
185 : }
186 : }
187 0 : }
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