/* 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/fork_detect.h"

#include "fipsmodule/rand/internal.h"

#include "internal.h"

static_assert(sizeof(ossl_ssize_t) == sizeof(size_t),

              "ossl_ssize_t should be the same size as size_t");

#if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_STATIC_ARMCAP) && \

    (defined(OPENSSL_X86) || defined(OPENSSL_X86_64) ||            \

     defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64))

// x86, x86_64, and the ARMs need to record the result of a cpuid/getauxval call

// for the asm to work correctly, unless compiled without asm code.

#define NEED_CPUID

#else

// Otherwise, don't emit a static initialiser.

#if !defined(BORINGSSL_NO_STATIC_INITIALIZER)

#define BORINGSSL_NO_STATIC_INITIALIZER

#endif

#endif  // !NO_ASM && !STATIC_ARMCAP && (X86 || X86_64 || ARM || AARCH64)

// 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 __attribute__((visibility("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] = {0};

uint32_t OPENSSL_get_ia32cap(int idx) {

  CRYPTO_library_init();

  return OPENSSL_ia32cap_P[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) {

  CRYPTO_library_init();

  return &OPENSSL_armcap_P;

}

#endif

uint32_t OPENSSL_get_armcap(void) {

  CRYPTO_library_init();

  return OPENSSL_armcap_P;

}

#endif

#if defined(BORINGSSL_FIPS)

// In FIPS mode, the power-on self-test function calls |CRYPTO_library_init|

// because we have to ensure that CPUID detection occurs first.

#define BORINGSSL_NO_STATIC_INITIALIZER

#endif

#if defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_NO_STATIC_INITIALIZER)

#define OPENSSL_CDECL __cdecl

#else

#define OPENSSL_CDECL

#endif

#if defined(BORINGSSL_NO_STATIC_INITIALIZER)

static CRYPTO_once_t once = CRYPTO_ONCE_INIT;

#elif defined(_MSC_VER)

#pragma section(".CRT$XCU", read)

static void __cdecl do_library_init(void);

__declspec(allocate(".CRT$XCU")) void(*library_init_constructor)(void) =

    do_library_init;

#else

static void do_library_init(void) __attribute__ ((constructor));

#endif

// do_library_init is the actual initialization function. If

// BORINGSSL_NO_STATIC_INITIALIZER isn't defined, this is set as a static

// initializer. Otherwise, it is called by CRYPTO_library_init.

static void OPENSSL_CDECL do_library_init(void) {

 // WARNING: this function may only configure the capability variables. See the

 // note above about the linker bug.

#if defined(NEED_CPUID)

  OPENSSL_cpuid_setup();

#endif

}

void CRYPTO_library_init(void) {

  // TODO(davidben): It would be tidier if this build knob could be replaced

  // with an internal lazy-init mechanism that would handle things correctly

  // in-library. https://crbug.com/542879

#if defined(BORINGSSL_NO_STATIC_INITIALIZER)

  CRYPTO_once(&once, do_library_init);

#endif

}

int CRYPTO_is_confidential_build(void) {

#if defined(BORINGSSL_CONFIDENTIAL)

  return 1;

#else

  return 0;

#endif

}

int CRYPTO_has_asm(void) {

#if defined(OPENSSL_NO_ASM)

  return 0;

#else

  return 1;

#endif

}

void CRYPTO_pre_sandbox_init(void) {

  // Read from /proc/cpuinfo if needed.

  CRYPTO_library_init();

  // Open /dev/urandom if needed.

  CRYPTO_init_sysrand();

  // Set up MADV_WIPEONFORK state if needed.

  CRYPTO_get_fork_generation();

}

const char *SSLeay_version(int which) { return OpenSSL_version(which); }

const char *OpenSSL_version(int which) {

  switch (which) {

    case OPENSSL_VERSION:

      return "BoringSSL";

    case OPENSSL_CFLAGS:

      return "compiler: n/a";

    case OPENSSL_BUILT_ON:

      return "built on: n/a";

    case OPENSSL_PLATFORM:

      return "platform: n/a";

    case OPENSSL_DIR:

      return "OPENSSLDIR: n/a";

    default:

      return "not available";

  }

}

unsigned long SSLeay(void) { return OPENSSL_VERSION_NUMBER; }

unsigned long OpenSSL_version_num(void) { return OPENSSL_VERSION_NUMBER; }

int CRYPTO_malloc_init(void) { return 1; }

int OPENSSL_malloc_init(void) { return 1; }

void ENGINE_load_builtin_engines(void) {}

int ENGINE_register_all_complete(void) { return 1; }

void OPENSSL_load_builtin_modules(void) {}

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

  CRYPTO_library_init();

  return 1;

}

void OPENSSL_cleanup(void) {}