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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