third_party/ring/crypto/internal.h - incubator-teaclave-sgx-sdk - Git at Google

 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. All advertising materials mentioning features or use of this software
  *    must display the following acknowledgement:
  *    "This product includes cryptographic software written by
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
  * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
 /* ====================================================================
  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * 3. All advertising materials mentioning features or use of this
  *    software must display the following acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@openssl.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com). */

 #ifndef OPENSSL_HEADER_CRYPTO_INTERNAL_H
 #define OPENSSL_HEADER_CRYPTO_INTERNAL_H

 #include <assert.h>

 #if defined(__clang__) || defined(_MSC_VER)
 #include <string.h>
 #endif

 #include <stddef.h>

 #include <GFp/base.h>
 #include <GFp/type_check.h>

 #if defined(_MSC_VER)
 #pragma warning(push, 3)
 #include <intrin.h>
 #pragma warning(pop)
 #endif

 #if defined(__GNUC__) && \
     (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
 // |alignas| and |alignof| were added in C11. GCC added support in version 4.8.
 // Testing for __STDC_VERSION__/__cplusplus doesn't work because 4.7 already
 // reports support for C11.
 #define alignas(x) __attribute__ ((aligned (x)))
 #define alignof(x) __alignof__ (x)
 #elif !defined(__cplusplus)
 #if defined(_MSC_VER)
 #define alignas(x) __declspec(align(x))
 #define alignof(x) __alignof(x)
 #else
 #include <stdalign.h>
 #endif
 #endif

 #if defined(__cplusplus)
 extern "C" {
 #endif


 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || defined(OPENSSL_ARM) || \
     defined(OPENSSL_AARCH64) || defined(OPENSSL_PPC64LE)
 // GFp_cpuid_setup initializes the platform-specific feature cache.
 void GFp_cpuid_setup(void);
 #endif

 #define OPENSSL_LITTLE_ENDIAN 1
 #define OPENSSL_BIG_ENDIAN 2

 #if defined(OPENSSL_X86_64) || defined(OPENSSL_X86) || \
     (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
      __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
 #define OPENSSL_ENDIAN OPENSSL_LITTLE_ENDIAN
 #elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
       __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define OPENSSL_ENDIAN OPENSSL_BIG_ENDIAN
 #else
 #error "Cannot determine endianness"
 #endif


 #if defined(__GNUC__)
 #define bswap_u32(x) __builtin_bswap32(x)
 #define bswap_u64(x) __builtin_bswap64(x)
 #elif defined(_MSC_VER)
 #pragma intrinsic(_byteswap_ulong, _byteswap_uint64)
 #define bswap_u32(x) _byteswap_ulong(x)
 #define bswap_u64(x) _byteswap_uint64(x)
 #endif


 #if (!defined(_MSC_VER) || defined(__clang__)) && defined(OPENSSL_64_BIT)
 #define BORINGSSL_HAS_UINT128
 typedef __int128_t int128_t;
 typedef __uint128_t uint128_t;
 #endif


 // |aliasing_uint8| is like |uint8_t| except that it is guaranteed to be
 // |unsigned char| so it can safely be used for aliasing casts. Assume POSIX
 // compliance so that |CHAR_BIT| is guaranteed to be 8.
 typedef unsigned char aliasing_uint8;


 // Constant-time utility functions.
 //
 // The following methods return a bitmask of all ones (0xff...f) for true and 0
 // for false. This is useful for choosing a value based on the result of a
 // conditional in constant time. For example,
 //
 // if (a < b) {
 //   c = a;
 // } else {
 //   c = b;
 // }
 //
 // can be written as
 //
 // crypto_word lt = constant_time_lt_w(a, b);
 // c = constant_time_select_w(lt, a, b);

 // crypto_word is the type that most constant-time functions use. Ideally we
 // would like it to be |size_t|, but NaCl builds in 64-bit mode with 32-bit
 // pointers, which means that |size_t| can be 32 bits when |crypto_word| is 64
 // bits.
 #if defined(OPENSSL_64_BIT)
 typedef uint64_t crypto_word;
 #define CRYPTO_WORD_BITS (64u)
 #elif defined(OPENSSL_32_BIT)
 typedef uint32_t crypto_word;
 #define CRYPTO_WORD_BITS (32u)
 #else
 #error "Must define either OPENSSL_32_BIT or OPENSSL_64_BIT"
 #endif

 #define CONSTTIME_TRUE_W ~((crypto_word)0)
 #define CONSTTIME_FALSE_W ((crypto_word)0)

 // constant_time_msb_w returns the given value with the MSB copied to all the
 // other bits.
 static inline crypto_word constant_time_msb_w(crypto_word a) {
   return 0u - (a >> (sizeof(a) * 8 - 1));
 }

 // constant_time_is_zero_w returns 0xff..f if a == 0 and 0 otherwise.
 static inline crypto_word constant_time_is_zero_w(crypto_word a) {
   // Here is an SMT-LIB verification of this formula:
   //
   // (define-fun is_zero ((a (_ BitVec 32))) (_ BitVec 32)
   //   (bvand (bvnot a) (bvsub a #x00000001))
   // )
   //
   // (declare-fun a () (_ BitVec 32))
   //
   // (assert (not (= (= #x00000001 (bvlshr (is_zero a) #x0000001f)) (= a #x00000000))))
   // (check-sat)
   // (get-model)
   return constant_time_msb_w(~a & (a - 1));
 }

 static inline crypto_word constant_time_is_nonzero_w(crypto_word a) {
   return ~constant_time_is_zero_w(a);
 }

 // constant_time_eq_w returns 0xff..f if a == b and 0 otherwise.
 static inline crypto_word constant_time_eq_w(crypto_word a,
                                                crypto_word b) {
   return constant_time_is_zero_w(a ^ b);
 }

 // constant_time_eq_int acts like |constant_time_eq_w| but works on int
 // values.
 static inline crypto_word constant_time_eq_int(int a, int b) {
   return constant_time_eq_w((crypto_word)(a), (crypto_word)(b));
 }

 // constant_time_select_w returns (mask & a) | (~mask & b). When |mask| is all
 // 1s or all 0s (as returned by the methods above), the select methods return
 // either |a| (if |mask| is nonzero) or |b| (if |mask| is zero).
 static inline crypto_word constant_time_select_w(crypto_word mask,
                                                    crypto_word a,
                                                    crypto_word b) {
   return (mask & a) | (~mask & b);
 }

 // from_be_u32_ptr returns the 32-bit big-endian-encoded value at |data|.
 static inline uint32_t from_be_u32_ptr(const uint8_t *data) {
 #if defined(__clang__) || defined(_MSC_VER)
   // XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
   // well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
   // https://llvm.org/bugs/show_bug.cgi?id=17603,
   // http://blog.regehr.org/archives/702, and
   // http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
   uint32_t value;
   memcpy(&value, data, sizeof(value));
 #if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
   value = bswap_u32(value);
 #endif
   return value;
 #else
   return ((uint32_t)data[0] << 24) |
          ((uint32_t)data[1] << 16) |
          ((uint32_t)data[2] << 8) |
          ((uint32_t)data[3]);
 #endif
 }


 // from_be_u64_ptr returns the 64-bit big-endian-encoded value at |data|.
 static inline uint64_t from_be_u64_ptr(const uint8_t *data) {
 #if defined(__clang__) || defined(_MSC_VER)
   // XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
   // well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
   // https://llvm.org/bugs/show_bug.cgi?id=17603,
   // http://blog.regehr.org/archives/702, and
   // http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
   uint64_t value;
   memcpy(&value, data, sizeof(value));
 #if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
   value = bswap_u64(value);
 #endif
   return value;
 #else
   return ((uint64_t)data[0] << 56) |
          ((uint64_t)data[1] << 48) |
          ((uint64_t)data[2] << 40) |
          ((uint64_t)data[3] << 32) |
          ((uint64_t)data[4] << 24) |
          ((uint64_t)data[5] << 16) |
          ((uint64_t)data[6] << 8) |
          ((uint64_t)data[7]);
 #endif
 }

 // to_be_u32_ptr writes the value |x| to the location |out| in big-endian
 // order.
 static inline void to_be_u32_ptr(uint8_t *out, uint32_t value) {
 #if defined(__clang__) || defined(_MSC_VER)
   // XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
   // well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
   // https://llvm.org/bugs/show_bug.cgi?id=17603,
   // http://blog.regehr.org/archives/702, and
   // http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
 #if  OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
   value = bswap_u32(value);
 #endif
   memcpy(out, &value, sizeof(value));
 #else
   out[0] = (uint8_t)(value >> 24);
   out[1] = (uint8_t)(value >> 16);
   out[2] = (uint8_t)(value >> 8);
   out[3] = (uint8_t)value;
 #endif
 }

 // to_be_u64_ptr writes the value |value| to the location |out| in big-endian
 // order.
 static inline void to_be_u64_ptr(uint8_t *out, uint64_t value) {
 #if defined(__clang__) || defined(_MSC_VER)
   // XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
   // well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
   // https://llvm.org/bugs/show_bug.cgi?id=17603,
   // http://blog.regehr.org/archives/702, and
   // http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
 #if  OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
   value = bswap_u64(value);
 #endif
   memcpy(out, &value, sizeof(value));
 #else
   out[0] = (uint8_t)(value >> 56);
   out[1] = (uint8_t)(value >> 48);
   out[2] = (uint8_t)(value >> 40);
   out[3] = (uint8_t)(value >> 32);
   out[4] = (uint8_t)(value >> 24);
   out[5] = (uint8_t)(value >> 16);
   out[6] = (uint8_t)(value >> 8);
   out[7] = (uint8_t)value;
 #endif
 }

 // from_be_u64 returns the native representation of the 64-bit
 // big-endian-encoded value |x|.
 static inline uint64_t from_be_u64(uint64_t x) {
 #if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
   x = bswap_u64(x);
 #endif
   return x;
 }


 #if defined(__cplusplus)
 }  // extern C
 #endif

 #endif  // OPENSSL_HEADER_CRYPTO_INTERNAL_H
	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	* All rights reserved.
	*
	* This package is an SSL implementation written
	* by Eric Young (eay@cryptsoft.com).
	* The implementation was written so as to conform with Netscapes SSL.
	*
	* This library is free for commercial and non-commercial use as long as
	* the following conditions are aheared to. The following conditions
	* apply to all code found in this distribution, be it the RC4, RSA,
	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	* included with this distribution is covered by the same copyright terms
	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	*
	* Copyright remains Eric Young's, and as such any Copyright notices in
	* the code are not to be removed.
	* If this package is used in a product, Eric Young should be given attribution
	* as the author of the parts of the library used.
	* This can be in the form of a textual message at program startup or
	* in documentation (online or textual) provided with the package.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. All advertising materials mentioning features or use of this software
	* must display the following acknowledgement:
	* "This product includes cryptographic software written by
	* Eric Young (eay@cryptsoft.com)"
	* The word 'cryptographic' can be left out if the rouines from the library
	* being used are not cryptographic related :-).
	* 4. If you include any Windows specific code (or a derivative thereof) from
	* the apps directory (application code) you must include an acknowledgement:
	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	*
	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* The licence and distribution terms for any publically available version or
	* derivative of this code cannot be changed. i.e. this code cannot simply be
	* copied and put under another distribution licence
	* [including the GNU Public Licence.]
	*/
	/* ====================================================================
	* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. All advertising materials mentioning features or use of this
	* software must display the following acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@openssl.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	* OF THE POSSIBILITY OF SUCH DAMAGE.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com). */

	#ifndef OPENSSL_HEADER_CRYPTO_INTERNAL_H
	#define OPENSSL_HEADER_CRYPTO_INTERNAL_H

	#include <assert.h>

	#if defined(__clang__) \|\| defined(_MSC_VER)
	#include <string.h>
	#endif

	#include <stddef.h>

	#include <GFp/base.h>
	#include <GFp/type_check.h>

	#if defined(_MSC_VER)
	#pragma warning(push, 3)
	#include <intrin.h>
	#pragma warning(pop)
	#endif

	#if defined(__GNUC__) && \
	(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
	// \|alignas\| and \|alignof\| were added in C11. GCC added support in version 4.8.
	// Testing for __STDC_VERSION__/__cplusplus doesn't work because 4.7 already
	// reports support for C11.
	#define alignas(x) __attribute__ ((aligned (x)))
	#define alignof(x) __alignof__ (x)
	#elif !defined(__cplusplus)
	#if defined(_MSC_VER)
	#define alignas(x) __declspec(align(x))
	#define alignof(x) __alignof(x)
	#else
	#include <stdalign.h>
	#endif
	#endif

	#if defined(__cplusplus)
	extern "C" {
	#endif


	#if defined(OPENSSL_X86) \|\| defined(OPENSSL_X86_64) \|\| defined(OPENSSL_ARM) \|\| \
	defined(OPENSSL_AARCH64) \|\| defined(OPENSSL_PPC64LE)
	// GFp_cpuid_setup initializes the platform-specific feature cache.
	void GFp_cpuid_setup(void);
	#endif

	#define OPENSSL_LITTLE_ENDIAN 1
	#define OPENSSL_BIG_ENDIAN 2

	#if defined(OPENSSL_X86_64) \|\| defined(OPENSSL_X86) \|\| \
	(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
	__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
	#define OPENSSL_ENDIAN OPENSSL_LITTLE_ENDIAN
	#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
	__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	#define OPENSSL_ENDIAN OPENSSL_BIG_ENDIAN
	#else
	#error "Cannot determine endianness"
	#endif


	#if defined(__GNUC__)
	#define bswap_u32(x) __builtin_bswap32(x)
	#define bswap_u64(x) __builtin_bswap64(x)
	#elif defined(_MSC_VER)
	#pragma intrinsic(_byteswap_ulong, _byteswap_uint64)
	#define bswap_u32(x) _byteswap_ulong(x)
	#define bswap_u64(x) _byteswap_uint64(x)
	#endif


	#if (!defined(_MSC_VER) \|\| defined(__clang__)) && defined(OPENSSL_64_BIT)
	#define BORINGSSL_HAS_UINT128
	typedef __int128_t int128_t;
	typedef __uint128_t uint128_t;
	#endif


	// \|aliasing_uint8\| is like \|uint8_t\| except that it is guaranteed to be
	// \|unsigned char\| so it can safely be used for aliasing casts. Assume POSIX
	// compliance so that \|CHAR_BIT\| is guaranteed to be 8.
	typedef unsigned char aliasing_uint8;


	// Constant-time utility functions.
	//
	// The following methods return a bitmask of all ones (0xff...f) for true and 0
	// for false. This is useful for choosing a value based on the result of a
	// conditional in constant time. For example,
	//
	// if (a < b) {
	// c = a;
	// } else {
	// c = b;
	// }
	//
	// can be written as
	//
	// crypto_word lt = constant_time_lt_w(a, b);
	// c = constant_time_select_w(lt, a, b);

	// crypto_word is the type that most constant-time functions use. Ideally we
	// would like it to be \|size_t\|, but NaCl builds in 64-bit mode with 32-bit
	// pointers, which means that \|size_t\| can be 32 bits when \|crypto_word\| is 64
	// bits.
	#if defined(OPENSSL_64_BIT)
	typedef uint64_t crypto_word;
	#define CRYPTO_WORD_BITS (64u)
	#elif defined(OPENSSL_32_BIT)
	typedef uint32_t crypto_word;
	#define CRYPTO_WORD_BITS (32u)
	#else
	#error "Must define either OPENSSL_32_BIT or OPENSSL_64_BIT"
	#endif

	#define CONSTTIME_TRUE_W ~((crypto_word)0)
	#define CONSTTIME_FALSE_W ((crypto_word)0)

	// constant_time_msb_w returns the given value with the MSB copied to all the
	// other bits.
	static inline crypto_word constant_time_msb_w(crypto_word a) {
	return 0u - (a >> (sizeof(a) * 8 - 1));
	}

	// constant_time_is_zero_w returns 0xff..f if a == 0 and 0 otherwise.
	static inline crypto_word constant_time_is_zero_w(crypto_word a) {
	// Here is an SMT-LIB verification of this formula:
	//
	// (define-fun is_zero ((a (_ BitVec 32))) (_ BitVec 32)
	// (bvand (bvnot a) (bvsub a #x00000001))
	// )
	//
	// (declare-fun a () (_ BitVec 32))
	//
	// (assert (not (= (= #x00000001 (bvlshr (is_zero a) #x0000001f)) (= a #x00000000))))
	// (check-sat)
	// (get-model)
	return constant_time_msb_w(~a & (a - 1));
	}

	static inline crypto_word constant_time_is_nonzero_w(crypto_word a) {
	return ~constant_time_is_zero_w(a);
	}

	// constant_time_eq_w returns 0xff..f if a == b and 0 otherwise.
	static inline crypto_word constant_time_eq_w(crypto_word a,
	crypto_word b) {
	return constant_time_is_zero_w(a ^ b);
	}

	// constant_time_eq_int acts like \|constant_time_eq_w\| but works on int
	// values.
	static inline crypto_word constant_time_eq_int(int a, int b) {
	return constant_time_eq_w((crypto_word)(a), (crypto_word)(b));
	}

	// constant_time_select_w returns (mask & a) \| (~mask & b). When \|mask\| is all
	// 1s or all 0s (as returned by the methods above), the select methods return
	// either \|a\| (if \|mask\| is nonzero) or \|b\| (if \|mask\| is zero).
	static inline crypto_word constant_time_select_w(crypto_word mask,
	crypto_word a,
	crypto_word b) {
	return (mask & a) \| (~mask & b);
	}

	// from_be_u32_ptr returns the 32-bit big-endian-encoded value at \|data\|.
	static inline uint32_t from_be_u32_ptr(const uint8_t *data) {
	#if defined(__clang__) \|\| defined(_MSC_VER)
	// XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
	// well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
	// https://llvm.org/bugs/show_bug.cgi?id=17603,
	// http://blog.regehr.org/archives/702, and
	// http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
	uint32_t value;
	memcpy(&value, data, sizeof(value));
	#if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
	value = bswap_u32(value);
	#endif
	return value;
	#else
	return ((uint32_t)data[0] << 24) \|
	((uint32_t)data[1] << 16) \|
	((uint32_t)data[2] << 8) \|
	((uint32_t)data[3]);
	#endif
	}


	// from_be_u64_ptr returns the 64-bit big-endian-encoded value at \|data\|.
	static inline uint64_t from_be_u64_ptr(const uint8_t *data) {
	#if defined(__clang__) \|\| defined(_MSC_VER)
	// XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
	// well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
	// https://llvm.org/bugs/show_bug.cgi?id=17603,
	// http://blog.regehr.org/archives/702, and
	// http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
	uint64_t value;
	memcpy(&value, data, sizeof(value));
	#if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
	value = bswap_u64(value);
	#endif
	return value;
	#else
	return ((uint64_t)data[0] << 56) \|
	((uint64_t)data[1] << 48) \|
	((uint64_t)data[2] << 40) \|
	((uint64_t)data[3] << 32) \|
	((uint64_t)data[4] << 24) \|
	((uint64_t)data[5] << 16) \|
	((uint64_t)data[6] << 8) \|
	((uint64_t)data[7]);
	#endif
	}

	// to_be_u32_ptr writes the value \|x\| to the location \|out\| in big-endian
	// order.
	static inline void to_be_u32_ptr(uint8_t *out, uint32_t value) {
	#if defined(__clang__) \|\| defined(_MSC_VER)
	// XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
	// well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
	// https://llvm.org/bugs/show_bug.cgi?id=17603,
	// http://blog.regehr.org/archives/702, and
	// http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
	#if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
	value = bswap_u32(value);
	#endif
	memcpy(out, &value, sizeof(value));
	#else
	out[0] = (uint8_t)(value >> 24);
	out[1] = (uint8_t)(value >> 16);
	out[2] = (uint8_t)(value >> 8);
	out[3] = (uint8_t)value;
	#endif
	}

	// to_be_u64_ptr writes the value \|value\| to the location \|out\| in big-endian
	// order.
	static inline void to_be_u64_ptr(uint8_t *out, uint64_t value) {
	#if defined(__clang__) \|\| defined(_MSC_VER)
	// XXX: Unlike GCC, Clang doesn't optimize compliant access to unaligned data
	// well. See https://llvm.org/bugs/show_bug.cgi?id=20605,
	// https://llvm.org/bugs/show_bug.cgi?id=17603,
	// http://blog.regehr.org/archives/702, and
	// http://blog.regehr.org/archives/1055. MSVC seems to have similar problems.
	#if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
	value = bswap_u64(value);
	#endif
	memcpy(out, &value, sizeof(value));
	#else
	out[0] = (uint8_t)(value >> 56);
	out[1] = (uint8_t)(value >> 48);
	out[2] = (uint8_t)(value >> 40);
	out[3] = (uint8_t)(value >> 32);
	out[4] = (uint8_t)(value >> 24);
	out[5] = (uint8_t)(value >> 16);
	out[6] = (uint8_t)(value >> 8);
	out[7] = (uint8_t)value;
	#endif
	}

	// from_be_u64 returns the native representation of the 64-bit
	// big-endian-encoded value \|x\|.
	static inline uint64_t from_be_u64(uint64_t x) {
	#if OPENSSL_ENDIAN != OPENSSL_BIG_ENDIAN
	x = bswap_u64(x);
	#endif
	return x;
	}


	#if defined(__cplusplus)
	} // extern C
	#endif

	#endif // OPENSSL_HEADER_CRYPTO_INTERNAL_H