1 /* crypto/buffer/buffer.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include "internal/cryptlib.h"
61 #include <openssl/buffer.h>
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.
68 #define LIMIT_BEFORE_EXPANSION 0x5ffffffc
70 BUF_MEM *BUF_MEM_new_ex(unsigned long flags)
80 BUF_MEM *BUF_MEM_new(void)
84 ret = OPENSSL_zalloc(sizeof(*ret));
86 BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE);
92 void BUF_MEM_free(BUF_MEM *a)
97 if (a->data != NULL) {
98 memset(a->data, 0, (unsigned int)a->max);
99 if (a->flags & BUF_MEM_FLAG_SECURE)
100 OPENSSL_secure_free(a->data);
102 OPENSSL_clear_free(a->data, a->max);
107 /* Allocate a block of secure memory; copy over old data if there
108 * was any, and then free it. */
109 static char *sec_alloc_realloc(BUF_MEM *str, size_t len)
113 ret = OPENSSL_secure_malloc(len);
114 if (str->data != NULL) {
116 memcpy(ret, str->data, str->length);
117 OPENSSL_secure_free(str->data);
122 size_t BUF_MEM_grow(BUF_MEM *str, size_t len)
127 if (str->length >= len) {
131 if (str->max >= len) {
132 memset(&str->data[str->length], 0, len - str->length);
136 /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
137 if (len > LIMIT_BEFORE_EXPANSION) {
138 BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
141 n = (len + 3) / 3 * 4;
142 if ((str->flags & BUF_MEM_FLAG_SECURE))
143 ret = sec_alloc_realloc(str, n);
145 ret = OPENSSL_realloc(str->data, n);
147 BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
152 memset(&str->data[str->length], 0, len - str->length);
158 size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
163 if (str->length >= len) {
164 memset(&str->data[len], 0, str->length - len);
168 if (str->max >= len) {
169 memset(&str->data[str->length], 0, len - str->length);
173 /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
174 if (len > LIMIT_BEFORE_EXPANSION) {
175 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
178 n = (len + 3) / 3 * 4;
179 if ((str->flags & BUF_MEM_FLAG_SECURE))
180 ret = sec_alloc_realloc(str, n);
182 ret = OPENSSL_realloc_clean(str->data, str->max, n);
184 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
189 memset(&str->data[str->length], 0, len - str->length);
195 void BUF_reverse(unsigned char *out, unsigned char *in, size_t size)
200 for (i = 0; i < size; i++)
206 for (i = 0; i < size / 2; i++) {