1 /* Copyright (c) 2014, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include <openssl/crypto.h>
16
17 #include <openssl/cpu.h>
18
19 #include "internal.h"
20
21
22 #if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_STATIC_ARMCAP) && \
23 (defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || \
24 defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) || \
25 defined(OPENSSL_PPC64LE))
26 // x86, x86_64, the ARMs and ppc64le need to record the result of a
27 // cpuid/getauxval call for the asm to work correctly, unless compiled without
28 // asm code.
29 #define NEED_CPUID
30
31 #else
32
33 // Otherwise, don't emit a static initialiser.
34
35 #if !defined(BORINGSSL_NO_STATIC_INITIALIZER)
36 #define BORINGSSL_NO_STATIC_INITIALIZER
37 #endif
38
39 #endif /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64 ||
40 OPENSSL_ARM || OPENSSL_AARCH64) */
41
42
43 // Our assembly does not use the GOT to reference symbols, which means
44 // references to visible symbols will often require a TEXTREL. This is
45 // undesirable, so all assembly-referenced symbols should be hidden. CPU
46 // capabilities are the only such symbols defined in C. Explicitly hide them,
47 // rather than rely on being built with -fvisibility=hidden.
48 #if defined(OPENSSL_WINDOWS)
49 #define HIDDEN
50 #else
51 #define HIDDEN __attribute__((visibility("hidden")))
52 #endif
53
54
55 // The capability variables are defined in this file in order to work around a
56 // linker bug. When linking with a .a, if no symbols in a .o are referenced
57 // then the .o is discarded, even if it has constructor functions.
58 //
59 // This still means that any binaries that don't include some functionality
60 // that tests the capability values will still skip the constructor but, so
61 // far, the init constructor function only sets the capability variables.
62
63 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
64
65 // This value must be explicitly initialised to zero in order to work around a
66 // bug in libtool or the linker on OS X.
67 //
68 // If not initialised then it becomes a "common symbol". When put into an
69 // archive, linking on OS X will fail to resolve common symbols. By
70 // initialising it to zero, it becomes a "data symbol", which isn't so
71 // affected.
72 HIDDEN uint32_t OPENSSL_ia32cap_P[4] = {0};
73
74 #elif defined(OPENSSL_PPC64LE)
75
76 HIDDEN unsigned long OPENSSL_ppc64le_hwcap2 = 0;
77
78 #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
79
80 #include <openssl/arm_arch.h>
81
82 #if defined(OPENSSL_STATIC_ARMCAP)
83
84 HIDDEN uint32_t OPENSSL_armcap_P =
85 #if defined(OPENSSL_STATIC_ARMCAP_NEON) || defined(__ARM_NEON__)
86 ARMV7_NEON |
87 #endif
88 #if defined(OPENSSL_STATIC_ARMCAP_AES) || defined(__ARM_FEATURE_CRYPTO)
89 ARMV8_AES |
90 #endif
91 #if defined(OPENSSL_STATIC_ARMCAP_SHA1) || defined(__ARM_FEATURE_CRYPTO)
92 ARMV8_SHA1 |
93 #endif
94 #if defined(OPENSSL_STATIC_ARMCAP_SHA256) || defined(__ARM_FEATURE_CRYPTO)
95 ARMV8_SHA256 |
96 #endif
97 #if defined(OPENSSL_STATIC_ARMCAP_PMULL) || defined(__ARM_FEATURE_CRYPTO)
98 ARMV8_PMULL |
99 #endif
100 0;
101
102 #else
103 HIDDEN uint32_t OPENSSL_armcap_P = 0;
104 #endif
105
106 #endif
107
108 #if defined(BORINGSSL_FIPS)
109 // In FIPS mode, the power-on self-test function calls |CRYPTO_library_init|
110 // because we have to ensure that CPUID detection occurs first.
111 #define BORINGSSL_NO_STATIC_INITIALIZER
112 #endif
113
114 #if defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_NO_STATIC_INITIALIZER)
115 #define OPENSSL_CDECL __cdecl
116 #else
117 #define OPENSSL_CDECL
118 #endif
119
120 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
121 static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
122 #elif defined(_MSC_VER)
123 #pragma section(".CRT$XCU", read)
124 static void __cdecl do_library_init(void);
125 __declspec(allocate(".CRT$XCU")) void(*library_init_constructor)(void) =
126 do_library_init;
127 #else
128 static void do_library_init(void) __attribute__ ((constructor));
129 #endif
130
131 // do_library_init is the actual initialization function. If
132 // BORINGSSL_NO_STATIC_INITIALIZER isn't defined, this is set as a static
133 // initializer. Otherwise, it is called by CRYPTO_library_init.
do_library_init(void)134 static void OPENSSL_CDECL do_library_init(void) {
135 // WARNING: this function may only configure the capability variables. See the
136 // note above about the linker bug.
137 #if defined(NEED_CPUID)
138 OPENSSL_cpuid_setup();
139 #endif
140 }
141
CRYPTO_library_init(void)142 void CRYPTO_library_init(void) {
143 // TODO(davidben): It would be tidier if this build knob could be replaced
144 // with an internal lazy-init mechanism that would handle things correctly
145 // in-library. https://crbug.com/542879
146 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
147 CRYPTO_once(&once, do_library_init);
148 #endif
149 }
150
CRYPTO_is_confidential_build(void)151 int CRYPTO_is_confidential_build(void) {
152 #if defined(BORINGSSL_CONFIDENTIAL)
153 return 1;
154 #else
155 return 0;
156 #endif
157 }
158
CRYPTO_has_asm(void)159 int CRYPTO_has_asm(void) {
160 #if defined(OPENSSL_NO_ASM)
161 return 0;
162 #else
163 return 1;
164 #endif
165 }
166
SSLeay_version(int unused)167 const char *SSLeay_version(int unused) {
168 return "BoringSSL";
169 }
170
OpenSSL_version(int unused)171 const char *OpenSSL_version(int unused) {
172 return "BoringSSL";
173 }
174
SSLeay(void)175 unsigned long SSLeay(void) {
176 return OPENSSL_VERSION_NUMBER;
177 }
178
OpenSSL_version_num(void)179 unsigned long OpenSSL_version_num(void) {
180 return OPENSSL_VERSION_NUMBER;
181 }
182
CRYPTO_malloc_init(void)183 int CRYPTO_malloc_init(void) {
184 return 1;
185 }
186
ENGINE_load_builtin_engines(void)187 void ENGINE_load_builtin_engines(void) {}
188
ENGINE_register_all_complete(void)189 int ENGINE_register_all_complete(void) {
190 return 1;
191 }
192
OPENSSL_load_builtin_modules(void)193 void OPENSSL_load_builtin_modules(void) {}
194
OPENSSL_init_crypto(uint64_t opts,const OPENSSL_INIT_SETTINGS * settings)195 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) {
196 CRYPTO_library_init();
197 return 1;
198 }
199