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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 #ifndef OPENSSL_HEADER_MEM_H
58 #define OPENSSL_HEADER_MEM_H
59 
60 #include <openssl/base.h>
61 
62 #include <stdlib.h>
63 #include <stdarg.h>
64 
65 #if defined(__cplusplus)
66 extern "C" {
67 #endif
68 
69 
70 // Memory and string functions, see also buf.h.
71 //
72 // BoringSSL has its own set of allocation functions, which keep track of
73 // allocation lengths and zero them out before freeing. All memory returned by
74 // BoringSSL API calls must therefore generally be freed using |OPENSSL_free|
75 // unless stated otherwise.
76 
77 
78 // OPENSSL_malloc acts like a regular |malloc|.
79 OPENSSL_EXPORT void *OPENSSL_malloc(size_t size);
80 
81 // OPENSSL_free does nothing if |ptr| is NULL. Otherwise it zeros out the
82 // memory allocated at |ptr| and frees it.
83 OPENSSL_EXPORT void OPENSSL_free(void *ptr);
84 
85 // OPENSSL_realloc returns a pointer to a buffer of |new_size| bytes that
86 // contains the contents of |ptr|. Unlike |realloc|, a new buffer is always
87 // allocated and the data at |ptr| is always wiped and freed.
88 OPENSSL_EXPORT void *OPENSSL_realloc(void *ptr, size_t new_size);
89 
90 // OPENSSL_cleanse zeros out |len| bytes of memory at |ptr|. This is similar to
91 // |memset_s| from C11.
92 OPENSSL_EXPORT void OPENSSL_cleanse(void *ptr, size_t len);
93 
94 // CRYPTO_memcmp returns zero iff the |len| bytes at |a| and |b| are equal. It
95 // takes an amount of time dependent on |len|, but independent of the contents
96 // of |a| and |b|. Unlike memcmp, it cannot be used to put elements into a
97 // defined order as the return value when a != b is undefined, other than to be
98 // non-zero.
99 OPENSSL_EXPORT int CRYPTO_memcmp(const void *a, const void *b, size_t len);
100 
101 // OPENSSL_hash32 implements the 32 bit, FNV-1a hash.
102 OPENSSL_EXPORT uint32_t OPENSSL_hash32(const void *ptr, size_t len);
103 
104 // OPENSSL_strdup has the same behaviour as strdup(3).
105 OPENSSL_EXPORT char *OPENSSL_strdup(const char *s);
106 
107 // OPENSSL_strnlen has the same behaviour as strnlen(3).
108 OPENSSL_EXPORT size_t OPENSSL_strnlen(const char *s, size_t len);
109 
110 // OPENSSL_tolower is a locale-independent version of tolower(3).
111 OPENSSL_EXPORT int OPENSSL_tolower(int c);
112 
113 // OPENSSL_strcasecmp is a locale-independent version of strcasecmp(3).
114 OPENSSL_EXPORT int OPENSSL_strcasecmp(const char *a, const char *b);
115 
116 // OPENSSL_strncasecmp is a locale-independent version of strncasecmp(3).
117 OPENSSL_EXPORT int OPENSSL_strncasecmp(const char *a, const char *b, size_t n);
118 
119 // DECIMAL_SIZE returns an upper bound for the length of the decimal
120 // representation of the given type.
121 #define DECIMAL_SIZE(type)	((sizeof(type)*8+2)/3+1)
122 
123 // BIO_snprintf has the same behavior as snprintf(3).
124 OPENSSL_EXPORT int BIO_snprintf(char *buf, size_t n, const char *format, ...)
125     OPENSSL_PRINTF_FORMAT_FUNC(3, 4);
126 
127 // BIO_vsnprintf has the same behavior as vsnprintf(3).
128 OPENSSL_EXPORT int BIO_vsnprintf(char *buf, size_t n, const char *format,
129                                  va_list args)
130     OPENSSL_PRINTF_FORMAT_FUNC(3, 0);
131 
132 
133 // Deprecated functions.
134 
135 #define CRYPTO_malloc OPENSSL_malloc
136 #define CRYPTO_realloc OPENSSL_realloc
137 #define CRYPTO_free OPENSSL_free
138 
139 // OPENSSL_clear_free calls |OPENSSL_free|. BoringSSL automatically clears all
140 // allocations on free, but we define |OPENSSL_clear_free| for compatibility.
141 OPENSSL_EXPORT void OPENSSL_clear_free(void *ptr, size_t len);
142 
143 
144 #if defined(__cplusplus)
145 }  // extern C
146 
147 extern "C++" {
148 
149 BSSL_NAMESPACE_BEGIN
150 
151 BORINGSSL_MAKE_DELETER(char, OPENSSL_free)
152 BORINGSSL_MAKE_DELETER(uint8_t, OPENSSL_free)
153 
154 BSSL_NAMESPACE_END
155 
156 }  // extern C++
157 
158 #endif
159 
160 #endif  // OPENSSL_HEADER_MEM_H
161