chromium/third_party/boringssl/src/crypto/crypto.c

/* Copyright (c) 2014, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <openssl/crypto.h>

#include <assert.h>

#include "fipsmodule/rand/internal.h"
#include "bcm_support.h"
#include "internal.h"


static_assert;


// Our assembly does not use the GOT to reference symbols, which means
// references to visible symbols will often require a TEXTREL. This is
// undesirable, so all assembly-referenced symbols should be hidden. CPU
// capabilities are the only such symbols defined in C. Explicitly hide them,
// rather than rely on being built with -fvisibility=hidden.
#if defined(OPENSSL_WINDOWS)
#define HIDDEN
#else
#define HIDDEN …
#endif


// The capability variables are defined in this file in order to work around a
// linker bug. When linking with a .a, if no symbols in a .o are referenced
// then the .o is discarded, even if it has constructor functions.
//
// This still means that any binaries that don't include some functionality
// that tests the capability values will still skip the constructor but, so
// far, the init constructor function only sets the capability variables.

#if defined(BORINGSSL_DISPATCH_TEST)
// This value must be explicitly initialised to zero in order to work around a
// bug in libtool or the linker on OS X.
//
// If not initialised then it becomes a "common symbol". When put into an
// archive, linking on OS X will fail to resolve common symbols. By
// initialising it to zero, it becomes a "data symbol", which isn't so
// affected.
HIDDEN uint8_t BORINGSSL_function_hit[7] = {0};
#endif

#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)

// This value must be explicitly initialized to zero. See similar comment above.
HIDDEN uint32_t OPENSSL_ia32cap_P[4] = …;

uint32_t OPENSSL_get_ia32cap(int idx) { … }

#elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)

#include <openssl/arm_arch.h>

#if defined(OPENSSL_STATIC_ARMCAP)

// See ARM ACLE for the definitions of these macros. Note |__ARM_FEATURE_AES|
// covers both AES and PMULL and |__ARM_FEATURE_SHA2| covers SHA-1 and SHA-256.
// https://developer.arm.com/architectures/system-architectures/software-standards/acle
// https://github.com/ARM-software/acle/issues/152
//
// TODO(davidben): Do we still need |OPENSSL_STATIC_ARMCAP_*| or are the
// standard flags and -march sufficient?
HIDDEN uint32_t OPENSSL_armcap_P =
#if defined(OPENSSL_STATIC_ARMCAP_NEON) || defined(__ARM_NEON)
    ARMV7_NEON |
#endif
#if defined(OPENSSL_STATIC_ARMCAP_AES) || defined(__ARM_FEATURE_AES)
    ARMV8_AES |
#endif
#if defined(OPENSSL_STATIC_ARMCAP_PMULL) || defined(__ARM_FEATURE_AES)
    ARMV8_PMULL |
#endif
#if defined(OPENSSL_STATIC_ARMCAP_SHA1) || defined(__ARM_FEATURE_SHA2)
    ARMV8_SHA1 |
#endif
#if defined(OPENSSL_STATIC_ARMCAP_SHA256) || defined(__ARM_FEATURE_SHA2)
    ARMV8_SHA256 |
#endif
#if defined(__ARM_FEATURE_SHA512)
    ARMV8_SHA512 |
#endif
    0;

#else
HIDDEN uint32_t OPENSSL_armcap_P = 0;

uint32_t *OPENSSL_get_armcap_pointer_for_test(void) {
  OPENSSL_init_cpuid();
  return &OPENSSL_armcap_P;
}
#endif

uint32_t OPENSSL_get_armcap(void) {
  OPENSSL_init_cpuid();
  return OPENSSL_armcap_P;
}

#endif

#if defined(NEED_CPUID)
static CRYPTO_once_t once = …;
void OPENSSL_init_cpuid(void) { … }
#endif

void CRYPTO_library_init(void) { … }

int CRYPTO_is_confidential_build(void) { … }

int CRYPTO_has_asm(void) { … }

void CRYPTO_pre_sandbox_init(void) { … }

const char *SSLeay_version(int which) { … }

const char *OpenSSL_version(int which) { … }

unsigned long SSLeay(void) { … }

unsigned long OpenSSL_version_num(void) { … }

int CRYPTO_malloc_init(void) { … }

int OPENSSL_malloc_init(void) { … }

void ENGINE_load_builtin_engines(void) { … }

int ENGINE_register_all_complete(void) { … }

void OPENSSL_load_builtin_modules(void) { … }

int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) { … }

void OPENSSL_cleanup(void) { … }