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 #if !defined(_POSIX_C_SOURCE)
58 #define _POSIX_C_SOURCE 201410L /* needed for strdup, snprintf, vprintf etc */
59 #endif
60
61 #include <openssl/mem.h>
62
63 #include <assert.h>
64 #include <stdarg.h>
65 #include <stdio.h>
66 #include <string.h>
67
68 #if defined(OPENSSL_WINDOWS)
69 OPENSSL_MSVC_PRAGMA(warning(push, 3))
70 #include <windows.h>
71
72 /* Work around a clang-cl bug: SecureZeroMemory() below uses __stosb() but
73 * windows.h only declares that intrinsic and then uses `#pragma intrinsic` for
74 * it. clang-cl doesn't implement `#pragma intrinsic` yet; it instead defines
75 * the function as an always-inline symbol in its intrin.h.
76 * TODO(thakis): Remove this once http://llvm.org/PR19898 is fixed.
77 */
78 #include <intrin.h>
OPENSSL_MSVC_PRAGMA(warning (pop))79 OPENSSL_MSVC_PRAGMA(warning(pop))
80 #else
81 #include <strings.h>
82 #endif
83
84
85 void *OPENSSL_realloc_clean(void *ptr, size_t old_size, size_t new_size) {
86 void *ret = NULL;
87
88 if (ptr == NULL) {
89 return OPENSSL_malloc(new_size);
90 }
91
92 if (new_size == 0) {
93 return NULL;
94 }
95
96 /* We don't support shrinking the buffer. Note the memcpy that copies
97 * |old_size| bytes to the new buffer, below. */
98 if (new_size < old_size) {
99 return NULL;
100 }
101
102 ret = OPENSSL_malloc(new_size);
103 if (ret == NULL) {
104 return NULL;
105 }
106
107 memcpy(ret, ptr, old_size);
108 OPENSSL_cleanse(ptr, old_size);
109 OPENSSL_free(ptr);
110 return ret;
111 }
112
OPENSSL_cleanse(void * ptr,size_t len)113 void OPENSSL_cleanse(void *ptr, size_t len) {
114 #if defined(OPENSSL_WINDOWS)
115 SecureZeroMemory(ptr, len);
116 #else
117 memset(ptr, 0, len);
118
119 #if !defined(OPENSSL_NO_ASM)
120 /* As best as we can tell, this is sufficient to break any optimisations that
121 might try to eliminate "superfluous" memsets. If there's an easy way to
122 detect memset_s, it would be better to use that. */
123 __asm__ __volatile__("" : : "r"(ptr) : "memory");
124 #endif
125 #endif /* !OPENSSL_NO_ASM */
126 }
127
CRYPTO_memcmp(const void * in_a,const void * in_b,size_t len)128 int CRYPTO_memcmp(const void *in_a, const void *in_b, size_t len) {
129 const uint8_t *a = in_a;
130 const uint8_t *b = in_b;
131 uint8_t x = 0;
132
133 for (size_t i = 0; i < len; i++) {
134 x |= a[i] ^ b[i];
135 }
136
137 return x;
138 }
139
OPENSSL_hash32(const void * ptr,size_t len)140 uint32_t OPENSSL_hash32(const void *ptr, size_t len) {
141 /* These are the FNV-1a parameters for 32 bits. */
142 static const uint32_t kPrime = 16777619u;
143 static const uint32_t kOffsetBasis = 2166136261u;
144
145 const uint8_t *in = ptr;
146 size_t i;
147 uint32_t h = kOffsetBasis;
148
149 for (i = 0; i < len; i++) {
150 h ^= in[i];
151 h *= kPrime;
152 }
153
154 return h;
155 }
156
OPENSSL_strnlen(const char * s,size_t len)157 size_t OPENSSL_strnlen(const char *s, size_t len) {
158 size_t i;
159
160 for (i = 0; i < len; i++) {
161 if (s[i] == 0) {
162 return i;
163 }
164 }
165
166 return len;
167 }
168
169 #if defined(OPENSSL_WINDOWS)
170
OPENSSL_strdup(const char * s)171 char *OPENSSL_strdup(const char *s) { return _strdup(s); }
172
OPENSSL_strcasecmp(const char * a,const char * b)173 int OPENSSL_strcasecmp(const char *a, const char *b) {
174 return _stricmp(a, b);
175 }
176
OPENSSL_strncasecmp(const char * a,const char * b,size_t n)177 int OPENSSL_strncasecmp(const char *a, const char *b, size_t n) {
178 return _strnicmp(a, b, n);
179 }
180
181 #else
182
OPENSSL_strdup(const char * s)183 char *OPENSSL_strdup(const char *s) { return strdup(s); }
184
OPENSSL_strcasecmp(const char * a,const char * b)185 int OPENSSL_strcasecmp(const char *a, const char *b) {
186 return strcasecmp(a, b);
187 }
188
OPENSSL_strncasecmp(const char * a,const char * b,size_t n)189 int OPENSSL_strncasecmp(const char *a, const char *b, size_t n) {
190 return strncasecmp(a, b, n);
191 }
192
193 #endif
194
BIO_snprintf(char * buf,size_t n,const char * format,...)195 int BIO_snprintf(char *buf, size_t n, const char *format, ...) {
196 va_list args;
197 int ret;
198
199 va_start(args, format);
200
201 ret = BIO_vsnprintf(buf, n, format, args);
202
203 va_end(args);
204 return ret;
205 }
206
BIO_vsnprintf(char * buf,size_t n,const char * format,va_list args)207 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args) {
208 return vsnprintf(buf, n, format, args);
209 }
210