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 /* The capability variables are defined in this file in order to work around a
44 * linker bug. When linking with a .a, if no symbols in a .o are referenced
45 * then the .o is discarded, even if it has constructor functions.
46 *
47 * This still means that any binaries that don't include some functionality
48 * that tests the capability values will still skip the constructor but, so
49 * far, the init constructor function only sets the capability variables. */
50
51 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
52
53 /* This value must be explicitly initialised to zero in order to work around a
54 * bug in libtool or the linker on OS X.
55 *
56 * If not initialised then it becomes a "common symbol". When put into an
57 * archive, linking on OS X will fail to resolve common symbols. By
58 * initialising it to zero, it becomes a "data symbol", which isn't so
59 * affected. */
60 uint32_t OPENSSL_ia32cap_P[4] = {0};
61
62 #elif defined(OPENSSL_PPC64LE)
63
64 unsigned long OPENSSL_ppc64le_hwcap2 = 0;
65
66 #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
67
68 #include <openssl/arm_arch.h>
69
70 #if defined(OPENSSL_STATIC_ARMCAP)
71
72 uint32_t OPENSSL_armcap_P =
73 #if defined(OPENSSL_STATIC_ARMCAP_NEON) || defined(__ARM_NEON__)
74 ARMV7_NEON |
75 #endif
76 #if defined(OPENSSL_STATIC_ARMCAP_AES) || defined(__ARM_FEATURE_CRYPTO)
77 ARMV8_AES |
78 #endif
79 #if defined(OPENSSL_STATIC_ARMCAP_SHA1) || defined(__ARM_FEATURE_CRYPTO)
80 ARMV8_SHA1 |
81 #endif
82 #if defined(OPENSSL_STATIC_ARMCAP_SHA256) || defined(__ARM_FEATURE_CRYPTO)
83 ARMV8_SHA256 |
84 #endif
85 #if defined(OPENSSL_STATIC_ARMCAP_PMULL) || defined(__ARM_FEATURE_CRYPTO)
86 ARMV8_PMULL |
87 #endif
88 0;
89
90 #else
91 uint32_t OPENSSL_armcap_P = 0;
92 #endif
93
94 #endif
95
96 #if defined(BORINGSSL_FIPS)
97 /* In FIPS mode, the power-on self-test function calls |CRYPTO_library_init|
98 * because we have to ensure that CPUID detection occurs first. */
99 #define BORINGSSL_NO_STATIC_INITIALIZER
100 #endif
101
102 #if defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_NO_STATIC_INITIALIZER)
103 #define OPENSSL_CDECL __cdecl
104 #else
105 #define OPENSSL_CDECL
106 #endif
107
108 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
109 static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
110 #elif defined(OPENSSL_WINDOWS)
111 #pragma section(".CRT$XCU", read)
112 static void __cdecl do_library_init(void);
113 __declspec(allocate(".CRT$XCU")) void(*library_init_constructor)(void) =
114 do_library_init;
115 #else
116 static void do_library_init(void) __attribute__ ((constructor));
117 #endif
118
119 /* do_library_init is the actual initialization function. If
120 * BORINGSSL_NO_STATIC_INITIALIZER isn't defined, this is set as a static
121 * initializer. Otherwise, it is called by CRYPTO_library_init. */
do_library_init(void)122 static void OPENSSL_CDECL do_library_init(void) {
123 /* WARNING: this function may only configure the capability variables. See the
124 * note above about the linker bug. */
125 #if defined(NEED_CPUID)
126 OPENSSL_cpuid_setup();
127 #endif
128 }
129
CRYPTO_library_init(void)130 void CRYPTO_library_init(void) {
131 /* TODO(davidben): It would be tidier if this build knob could be replaced
132 * with an internal lazy-init mechanism that would handle things correctly
133 * in-library. https://crbug.com/542879 */
134 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
135 CRYPTO_once(&once, do_library_init);
136 #endif
137 }
138
CRYPTO_is_confidential_build(void)139 int CRYPTO_is_confidential_build(void) {
140 #if defined(BORINGSSL_CONFIDENTIAL)
141 return 1;
142 #else
143 return 0;
144 #endif
145 }
146
CRYPTO_has_asm(void)147 int CRYPTO_has_asm(void) {
148 #if defined(OPENSSL_NO_ASM)
149 return 0;
150 #else
151 return 1;
152 #endif
153 }
154
SSLeay_version(int unused)155 const char *SSLeay_version(int unused) {
156 return "BoringSSL";
157 }
158
SSLeay(void)159 unsigned long SSLeay(void) {
160 return OPENSSL_VERSION_NUMBER;
161 }
162
CRYPTO_malloc_init(void)163 int CRYPTO_malloc_init(void) {
164 return 1;
165 }
166
ENGINE_load_builtin_engines(void)167 void ENGINE_load_builtin_engines(void) {}
168
ENGINE_register_all_complete(void)169 int ENGINE_register_all_complete(void) {
170 return 1;
171 }
172
OPENSSL_load_builtin_modules(void)173 void OPENSSL_load_builtin_modules(void) {}
174