1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/mem.h>
58
59 #include <assert.h>
60 #include <stdarg.h>
61 #include <stdio.h>
62 #include <string.h>
63
64 #if defined(OPENSSL_WINDOWS)
65 OPENSSL_MSVC_PRAGMA(warning(push, 3))
66 #include <windows.h>
OPENSSL_MSVC_PRAGMA(warning (pop))67 OPENSSL_MSVC_PRAGMA(warning(pop))
68 #else
69 #include <strings.h>
70 #endif
71
72 #include "internal.h"
73
74
75 #define OPENSSL_MALLOC_PREFIX 8
76
77
78 void *OPENSSL_malloc(size_t size) {
79 void *ptr = malloc(size + OPENSSL_MALLOC_PREFIX);
80 if (ptr == NULL) {
81 return NULL;
82 }
83
84 *(size_t *)ptr = size;
85
86 return ((uint8_t *)ptr) + OPENSSL_MALLOC_PREFIX;
87 }
88
OPENSSL_free(void * orig_ptr)89 void OPENSSL_free(void *orig_ptr) {
90 if (orig_ptr == NULL) {
91 return;
92 }
93
94 void *ptr = ((uint8_t *)orig_ptr) - OPENSSL_MALLOC_PREFIX;
95
96 size_t size = *(size_t *)ptr;
97 OPENSSL_cleanse(ptr, size + OPENSSL_MALLOC_PREFIX);
98 free(ptr);
99 }
100
OPENSSL_realloc(void * orig_ptr,size_t new_size)101 void *OPENSSL_realloc(void *orig_ptr, size_t new_size) {
102 if (orig_ptr == NULL) {
103 return OPENSSL_malloc(new_size);
104 }
105
106 void *ptr = ((uint8_t *)orig_ptr) - OPENSSL_MALLOC_PREFIX;
107 size_t old_size = *(size_t *)ptr;
108
109 void *ret = OPENSSL_malloc(new_size);
110 if (ret == NULL) {
111 return NULL;
112 }
113
114 size_t to_copy = new_size;
115 if (old_size < to_copy) {
116 to_copy = old_size;
117 }
118
119 memcpy(ret, orig_ptr, to_copy);
120 OPENSSL_free(orig_ptr);
121
122 return ret;
123 }
124
OPENSSL_cleanse(void * ptr,size_t len)125 void OPENSSL_cleanse(void *ptr, size_t len) {
126 #if defined(OPENSSL_WINDOWS)
127 SecureZeroMemory(ptr, len);
128 #else
129 OPENSSL_memset(ptr, 0, len);
130
131 #if !defined(OPENSSL_NO_ASM)
132 /* As best as we can tell, this is sufficient to break any optimisations that
133 might try to eliminate "superfluous" memsets. If there's an easy way to
134 detect memset_s, it would be better to use that. */
135 __asm__ __volatile__("" : : "r"(ptr) : "memory");
136 #endif
137 #endif // !OPENSSL_NO_ASM
138 }
139
CRYPTO_memcmp(const void * in_a,const void * in_b,size_t len)140 int CRYPTO_memcmp(const void *in_a, const void *in_b, size_t len) {
141 const uint8_t *a = in_a;
142 const uint8_t *b = in_b;
143 uint8_t x = 0;
144
145 for (size_t i = 0; i < len; i++) {
146 x |= a[i] ^ b[i];
147 }
148
149 return x;
150 }
151
OPENSSL_hash32(const void * ptr,size_t len)152 uint32_t OPENSSL_hash32(const void *ptr, size_t len) {
153 // These are the FNV-1a parameters for 32 bits.
154 static const uint32_t kPrime = 16777619u;
155 static const uint32_t kOffsetBasis = 2166136261u;
156
157 const uint8_t *in = ptr;
158 uint32_t h = kOffsetBasis;
159
160 for (size_t i = 0; i < len; i++) {
161 h ^= in[i];
162 h *= kPrime;
163 }
164
165 return h;
166 }
167
OPENSSL_strnlen(const char * s,size_t len)168 size_t OPENSSL_strnlen(const char *s, size_t len) {
169 for (size_t i = 0; i < len; i++) {
170 if (s[i] == 0) {
171 return i;
172 }
173 }
174
175 return len;
176 }
177
OPENSSL_strdup(const char * s)178 char *OPENSSL_strdup(const char *s) {
179 const size_t len = strlen(s) + 1;
180 char *ret = OPENSSL_malloc(len);
181 if (ret == NULL) {
182 return NULL;
183 }
184 OPENSSL_memcpy(ret, s, len);
185 return ret;
186 }
187
OPENSSL_tolower(int c)188 int OPENSSL_tolower(int c) {
189 if (c >= 'A' && c <= 'Z') {
190 return c + ('a' - 'A');
191 }
192 return c;
193 }
194
OPENSSL_strcasecmp(const char * a,const char * b)195 int OPENSSL_strcasecmp(const char *a, const char *b) {
196 for (size_t i = 0;; i++) {
197 const int aa = OPENSSL_tolower(a[i]);
198 const int bb = OPENSSL_tolower(b[i]);
199
200 if (aa < bb) {
201 return -1;
202 } else if (aa > bb) {
203 return 1;
204 } else if (aa == 0) {
205 return 0;
206 }
207 }
208 }
209
OPENSSL_strncasecmp(const char * a,const char * b,size_t n)210 int OPENSSL_strncasecmp(const char *a, const char *b, size_t n) {
211 for (size_t i = 0; i < n; i++) {
212 const int aa = OPENSSL_tolower(a[i]);
213 const int bb = OPENSSL_tolower(b[i]);
214
215 if (aa < bb) {
216 return -1;
217 } else if (aa > bb) {
218 return 1;
219 } else if (aa == 0) {
220 return 0;
221 }
222 }
223
224 return 0;
225 }
226
BIO_snprintf(char * buf,size_t n,const char * format,...)227 int BIO_snprintf(char *buf, size_t n, const char *format, ...) {
228 va_list args;
229 va_start(args, format);
230 int ret = BIO_vsnprintf(buf, n, format, args);
231 va_end(args);
232 return ret;
233 }
234
BIO_vsnprintf(char * buf,size_t n,const char * format,va_list args)235 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args) {
236 return vsnprintf(buf, n, format, args);
237 }
238