1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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> 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 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 } 100 101 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 } 124 125 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 } 139 140 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 } 151 152 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 } 167 168 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 } 177 178 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 } 187 188 int OPENSSL_tolower(int c) { 189 if (c >= 'A' && c <= 'Z') { 190 return c + ('a' - 'A'); 191 } 192 return c; 193 } 194 195 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 } 209 210 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 } 226 227 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 } 234 235 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args) { 236 return vsnprintf(buf, n, format, args); 237 } 238
