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. 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 } 141 142 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 } 150 151 int CRYPTO_is_confidential_build(void) { 152 #if defined(BORINGSSL_CONFIDENTIAL) 153 return 1; 154 #else 155 return 0; 156 #endif 157 } 158 159 int CRYPTO_has_asm(void) { 160 #if defined(OPENSSL_NO_ASM) 161 return 0; 162 #else 163 return 1; 164 #endif 165 } 166 167 const char *SSLeay_version(int unused) { 168 return "BoringSSL"; 169 } 170 171 const char *OpenSSL_version(int unused) { 172 return "BoringSSL"; 173 } 174 175 unsigned long SSLeay(void) { 176 return OPENSSL_VERSION_NUMBER; 177 } 178 179 unsigned long OpenSSL_version_num(void) { 180 return OPENSSL_VERSION_NUMBER; 181 } 182 183 int CRYPTO_malloc_init(void) { 184 return 1; 185 } 186 187 void ENGINE_load_builtin_engines(void) {} 188 189 int ENGINE_register_all_complete(void) { 190 return 1; 191 } 192 193 void OPENSSL_load_builtin_modules(void) {} 194 195 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) { 196 CRYPTO_library_init(); 197 return 1; 198 } 199
