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298 lines
11 KiB
298 lines
11 KiB
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#ifndef OPENSSL_HEADER_CRYPTO_INTERNAL_H
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#define OPENSSL_HEADER_CRYPTO_INTERNAL_H
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#include <GFp/base.h> // Must be first.
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#include "GFp/check.h"
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#if defined(__GNUC__) && \
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(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
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// |alignas| and |alignof| were added in C11. GCC added support in version 4.8.
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// Testing for __STDC_VERSION__/__cplusplus doesn't work because 4.7 already
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// reports support for C11.
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#define alignas(x) __attribute__ ((aligned (x)))
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#elif defined(_MSC_VER) && !defined(__clang__)
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#define alignas(x) __declspec(align(x))
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#else
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#include <stdalign.h>
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#endif
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#if (!defined(_MSC_VER) || defined(__clang__)) && defined(OPENSSL_64_BIT)
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#define BORINGSSL_HAS_UINT128
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typedef __int128_t int128_t;
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typedef __uint128_t uint128_t;
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#endif
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// Constant-time utility functions.
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//
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// The following methods return a bitmask of all ones (0xff...f) for true and 0
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// for false. This is useful for choosing a value based on the result of a
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// conditional in constant time. For example,
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//
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// if (a < b) {
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// c = a;
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// } else {
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// c = b;
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// }
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//
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// can be written as
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//
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// crypto_word lt = constant_time_lt_w(a, b);
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// c = constant_time_select_w(lt, a, b);
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// crypto_word is the type that most constant-time functions use. Ideally we
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// would like it to be |size_t|, but NaCl builds in 64-bit mode with 32-bit
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// pointers, which means that |size_t| can be 32 bits when |crypto_word| is 64
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// bits.
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#if defined(OPENSSL_64_BIT)
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typedef uint64_t crypto_word;
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#define CRYPTO_WORD_BITS (64u)
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#elif defined(OPENSSL_32_BIT)
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typedef uint32_t crypto_word;
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#define CRYPTO_WORD_BITS (32u)
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#else
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#error "Must define either OPENSSL_32_BIT or OPENSSL_64_BIT"
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#endif
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#define CONSTTIME_TRUE_W ~((crypto_word)0)
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#define CONSTTIME_FALSE_W ((crypto_word)0)
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// value_barrier_w returns |a|, but prevents GCC and Clang from reasoning about
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// the returned value. This is used to mitigate compilers undoing constant-time
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// code, until we can express our requirements directly in the language.
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//
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// Note the compiler is aware that |value_barrier_w| has no side effects and
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// always has the same output for a given input. This allows it to eliminate
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// dead code, move computations across loops, and vectorize.
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static inline crypto_word value_barrier_w(crypto_word a) {
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#if !defined(OPENSSL_NO_ASM) && (defined(__GNUC__) || defined(__clang__))
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__asm__("" : "+r"(a) : /* no inputs */);
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#endif
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return a;
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}
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// value_barrier_u32 behaves like |value_barrier_w| but takes a |uint32_t|.
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static inline uint32_t value_barrier_u32(uint32_t a) {
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#if !defined(OPENSSL_NO_ASM) && (defined(__GNUC__) || defined(__clang__))
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__asm__("" : "+r"(a) : /* no inputs */);
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#endif
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return a;
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}
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// value_barrier_u64 behaves like |value_barrier_w| but takes a |uint64_t|.
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static inline uint64_t value_barrier_u64(uint64_t a) {
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#if !defined(OPENSSL_NO_ASM) && (defined(__GNUC__) || defined(__clang__))
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__asm__("" : "+r"(a) : /* no inputs */);
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#endif
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return a;
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}
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// constant_time_msb_w returns the given value with the MSB copied to all the
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// other bits.
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static inline crypto_word constant_time_msb_w(crypto_word a) {
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return 0u - (a >> (sizeof(a) * 8 - 1));
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}
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// constant_time_is_zero_w returns 0xff..f if a == 0 and 0 otherwise.
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static inline crypto_word constant_time_is_zero_w(crypto_word a) {
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// Here is an SMT-LIB verification of this formula:
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//
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// (define-fun is_zero ((a (_ BitVec 32))) (_ BitVec 32)
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// (bvand (bvnot a) (bvsub a #x00000001))
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// )
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//
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// (declare-fun a () (_ BitVec 32))
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//
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// (assert (not (= (= #x00000001 (bvlshr (is_zero a) #x0000001f)) (= a #x00000000))))
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// (check-sat)
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// (get-model)
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return constant_time_msb_w(~a & (a - 1));
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}
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static inline crypto_word constant_time_is_nonzero_w(crypto_word a) {
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return ~constant_time_is_zero_w(a);
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}
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// constant_time_eq_w returns 0xff..f if a == b and 0 otherwise.
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static inline crypto_word constant_time_eq_w(crypto_word a,
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crypto_word b) {
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return constant_time_is_zero_w(a ^ b);
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}
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// constant_time_select_w returns (mask & a) | (~mask & b). When |mask| is all
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// 1s or all 0s (as returned by the methods above), the select methods return
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// either |a| (if |mask| is nonzero) or |b| (if |mask| is zero).
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static inline crypto_word constant_time_select_w(crypto_word mask,
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crypto_word a,
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crypto_word b) {
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// Clang recognizes this pattern as a select. While it usually transforms it
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// to a cmov, it sometimes further transforms it into a branch, which we do
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// not want.
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//
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// Adding barriers to both |mask| and |~mask| breaks the relationship between
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// the two, which makes the compiler stick with bitmasks.
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return (value_barrier_w(mask) & a) | (value_barrier_w(~mask) & b);
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}
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// Endianness conversions.
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#if defined(__GNUC__) && __GNUC__ >= 2
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static inline uint32_t CRYPTO_bswap4(uint32_t x) {
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return __builtin_bswap32(x);
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}
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#elif defined(_MSC_VER)
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#pragma warning(push, 3)
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#include <stdlib.h>
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#pragma warning(pop)
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#pragma intrinsic(_byteswap_uint64, _byteswap_ulong)
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static inline uint32_t CRYPTO_bswap4(uint32_t x) {
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return _byteswap_ulong(x);
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}
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#endif
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#if !defined(GFp_NOSTDLIBINC)
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#include <string.h>
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#endif
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static inline void *GFp_memcpy(void *dst, const void *src, size_t n) {
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#if !defined(GFp_NOSTDLIBINC)
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if (n == 0) {
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return dst;
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}
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return memcpy(dst, src, n);
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#else
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unsigned char *d = dst;
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const unsigned char *s = src;
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for (size_t i = 0; i < n; ++i) {
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d[i] = s[i];
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}
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return dst;
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#endif
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}
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static inline void *GFp_memset(void *dst, int c, size_t n) {
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#if !defined(GFp_NOSTDLIBINC)
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if (n == 0) {
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return dst;
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}
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return memset(dst, c, n);
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#else
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unsigned char *d = dst;
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for (size_t i = 0; i < n; ++i) {
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d[i] = (unsigned char)c;
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}
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return dst;
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#endif
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}
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#endif // OPENSSL_HEADER_CRYPTO_INTERNAL_H
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