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 // !NO_ASM && !STATIC_ARMCAP &&
40 // (X86 || X86_64 || ARM || AARCH64 || PPC64LE)
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(NDEBUG) && !defined(BORINGSSL_FIPS)
64 // This value must be explicitly initialised to zero in order to work around a
65 // bug in libtool or the linker on OS X.
66 //
67 // If not initialised then it becomes a "common symbol". When put into an
68 // archive, linking on OS X will fail to resolve common symbols. By
69 // initialising it to zero, it becomes a "data symbol", which isn't so
70 // affected.
71 HIDDEN uint8_t BORINGSSL_function_hit[7] = {0};
72 #endif
73
74 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
75
76 // This value must be explicitly initialized to zero. See similar comment above.
77 HIDDEN uint32_t OPENSSL_ia32cap_P[4] = {0};
78
79 #elif defined(OPENSSL_PPC64LE)
80
81 HIDDEN unsigned long OPENSSL_ppc64le_hwcap2 = 0;
82
83 #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
84
85 #include <openssl/arm_arch.h>
86
87 #if defined(OPENSSL_STATIC_ARMCAP)
88
89 HIDDEN uint32_t OPENSSL_armcap_P =
90 #if defined(OPENSSL_STATIC_ARMCAP_NEON) || \
91 (defined(__ARM_NEON__) || defined(__ARM_NEON))
92 ARMV7_NEON |
93 #endif
94 #if defined(OPENSSL_STATIC_ARMCAP_AES) || defined(__ARM_FEATURE_CRYPTO)
95 ARMV8_AES |
96 #endif
97 #if defined(OPENSSL_STATIC_ARMCAP_SHA1) || defined(__ARM_FEATURE_CRYPTO)
98 ARMV8_SHA1 |
99 #endif
100 #if defined(OPENSSL_STATIC_ARMCAP_SHA256) || defined(__ARM_FEATURE_CRYPTO)
101 ARMV8_SHA256 |
102 #endif
103 #if defined(OPENSSL_STATIC_ARMCAP_PMULL) || defined(__ARM_FEATURE_CRYPTO)
104 ARMV8_PMULL |
105 #endif
106 0;
107
108 #else
109 HIDDEN uint32_t OPENSSL_armcap_P = 0;
110
OPENSSL_get_armcap_pointer_for_test(void)111 uint32_t *OPENSSL_get_armcap_pointer_for_test(void) {
112 return &OPENSSL_armcap_P;
113 }
114 #endif
115
116 #endif
117
118 #if defined(BORINGSSL_FIPS)
119 // In FIPS mode, the power-on self-test function calls |CRYPTO_library_init|
120 // because we have to ensure that CPUID detection occurs first.
121 #define BORINGSSL_NO_STATIC_INITIALIZER
122 #endif
123
124 #if defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_NO_STATIC_INITIALIZER)
125 #define OPENSSL_CDECL __cdecl
126 #else
127 #define OPENSSL_CDECL
128 #endif
129
130 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
131 static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
132 #elif defined(_MSC_VER)
133 #pragma section(".CRT$XCU", read)
134 static void __cdecl do_library_init(void);
135 __declspec(allocate(".CRT$XCU")) void(*library_init_constructor)(void) =
136 do_library_init;
137 #else
138 static void do_library_init(void) __attribute__ ((constructor));
139 #endif
140
141 // do_library_init is the actual initialization function. If
142 // BORINGSSL_NO_STATIC_INITIALIZER isn't defined, this is set as a static
143 // initializer. Otherwise, it is called by CRYPTO_library_init.
do_library_init(void)144 static void OPENSSL_CDECL do_library_init(void) {
145 // WARNING: this function may only configure the capability variables. See the
146 // note above about the linker bug.
147 #if defined(NEED_CPUID)
148 OPENSSL_cpuid_setup();
149 #endif
150 }
151
CRYPTO_library_init(void)152 void CRYPTO_library_init(void) {
153 // TODO(davidben): It would be tidier if this build knob could be replaced
154 // with an internal lazy-init mechanism that would handle things correctly
155 // in-library. https://crbug.com/542879
156 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
157 CRYPTO_once(&once, do_library_init);
158 #endif
159 }
160
CRYPTO_is_confidential_build(void)161 int CRYPTO_is_confidential_build(void) {
162 #if defined(BORINGSSL_CONFIDENTIAL)
163 return 1;
164 #else
165 return 0;
166 #endif
167 }
168
CRYPTO_has_asm(void)169 int CRYPTO_has_asm(void) {
170 #if defined(OPENSSL_NO_ASM)
171 return 0;
172 #else
173 return 1;
174 #endif
175 }
176
SSLeay_version(int which)177 const char *SSLeay_version(int which) { return OpenSSL_version(which); }
178
OpenSSL_version(int which)179 const char *OpenSSL_version(int which) {
180 switch (which) {
181 case OPENSSL_VERSION:
182 return "BoringSSL";
183 case OPENSSL_CFLAGS:
184 return "compiler: n/a";
185 case OPENSSL_BUILT_ON:
186 return "built on: n/a";
187 case OPENSSL_PLATFORM:
188 return "platform: n/a";
189 case OPENSSL_DIR:
190 return "OPENSSLDIR: n/a";
191 default:
192 return "not available";
193 }
194 }
195
SSLeay(void)196 unsigned long SSLeay(void) { return OPENSSL_VERSION_NUMBER; }
197
OpenSSL_version_num(void)198 unsigned long OpenSSL_version_num(void) { return OPENSSL_VERSION_NUMBER; }
199
CRYPTO_malloc_init(void)200 int CRYPTO_malloc_init(void) { return 1; }
201
OPENSSL_malloc_init(void)202 int OPENSSL_malloc_init(void) { return 1; }
203
ENGINE_load_builtin_engines(void)204 void ENGINE_load_builtin_engines(void) {}
205
ENGINE_register_all_complete(void)206 int ENGINE_register_all_complete(void) { return 1; }
207
OPENSSL_load_builtin_modules(void)208 void OPENSSL_load_builtin_modules(void) {}
209
OPENSSL_init_crypto(uint64_t opts,const OPENSSL_INIT_SETTINGS * settings)210 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) {
211 CRYPTO_library_init();
212 return 1;
213 }
214
OPENSSL_cleanup(void)215 void OPENSSL_cleanup(void) {}
216